mirror of
https://github.com/mozilla/gecko-dev.git
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1972 lines
56 KiB
C++
1972 lines
56 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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*
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* This Original Code has been modified by IBM Corporation.
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* Modifications made by IBM described herein are
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* Copyright (c) International Business Machines
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* Corporation, 2000
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*
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* Modifications to Mozilla code or documentation
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* identified per MPL Section 3.3
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*
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* Date Modified by Description of modification
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* 03/27/2000 IBM Corp. Added PR_CALLBACK for Optlink
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* use in OS2
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*/
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/*
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Implementation for an in-memory RDF data store.
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TO DO
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1) Instrument this code to gather space and time performance
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characteristics.
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2) Optimize lookups for datasources which have a small number
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of properties + fanning out to a large number of targets.
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3) Complete implementation of thread-safety; specifically, make
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assertions be reference counted objects (so that a cursor can
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still refer to an assertion that gets removed from the graph).
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*/
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#include "nsAgg.h"
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#include "nsCOMPtr.h"
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#include "nscore.h"
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#include "nsArrayEnumerator.h"
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#include "nsIOutputStream.h"
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#include "nsIRDFDataSource.h"
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#include "nsIRDFLiteral.h"
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#include "nsIRDFNode.h"
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#include "nsIRDFObserver.h"
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#include "nsIRDFInMemoryDataSource.h"
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#include "nsIRDFPropagatableDataSource.h"
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#include "nsIRDFPurgeableDataSource.h"
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#include "nsIRDFService.h"
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#include "nsIServiceManager.h"
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#include "nsISupportsArray.h"
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#include "nsCOMArray.h"
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#include "nsEnumeratorUtils.h"
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#include "nsTArray.h"
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#include "nsCRT.h"
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#include "nsRDFCID.h"
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#include "nsRDFBaseDataSources.h"
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#include "nsString.h"
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#include "nsReadableUtils.h"
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#include "nsXPIDLString.h"
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#include "rdfutil.h"
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#include "PLDHashTable.h"
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#include "plstr.h"
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#include "mozilla/Logging.h"
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#include "rdf.h"
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#include "rdfIDataSource.h"
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#include "rdfITripleVisitor.h"
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using mozilla::LogLevel;
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// This struct is used as the slot value in the forward and reverse
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// arcs hash tables.
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//
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// Assertion objects are reference counted, because each Assertion's
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// ownership is shared between the datasource and any enumerators that
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// are currently iterating over the datasource.
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//
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class Assertion
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{
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public:
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Assertion(nsIRDFResource* aSource, // normal assertion
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nsIRDFResource* aProperty,
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nsIRDFNode* aTarget,
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bool aTruthValue);
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explicit Assertion(nsIRDFResource* aSource); // PLDHashTable assertion variant
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private:
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~Assertion();
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public:
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void AddRef() {
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if (mRefCnt == UINT16_MAX) {
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NS_WARNING("refcount overflow, leaking Assertion");
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return;
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}
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++mRefCnt;
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}
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void Release() {
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if (mRefCnt == UINT16_MAX) {
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NS_WARNING("refcount overflow, leaking Assertion");
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return;
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}
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if (--mRefCnt == 0)
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delete this;
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}
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// For nsIRDFPurgeableDataSource
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inline void Mark() { u.as.mMarked = true; }
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inline bool IsMarked() { return u.as.mMarked; }
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inline void Unmark() { u.as.mMarked = false; }
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// public for now, because I'm too lazy to go thru and clean this up.
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// These are shared between hash/as (see the union below)
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nsIRDFResource* mSource;
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Assertion* mNext;
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union
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{
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struct hash
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{
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PLDHashTable* mPropertyHash;
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} hash;
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struct as
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{
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nsIRDFResource* mProperty;
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nsIRDFNode* mTarget;
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Assertion* mInvNext;
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// make sure bool are final elements
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bool mTruthValue;
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bool mMarked;
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} as;
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} u;
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// also shared between hash/as (see the union above)
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// but placed after union definition to ensure that
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// all 32-bit entries are long aligned
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uint16_t mRefCnt;
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bool mHashEntry;
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};
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struct Entry : PLDHashEntryHdr {
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nsIRDFNode* mNode;
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Assertion* mAssertions;
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};
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Assertion::Assertion(nsIRDFResource* aSource)
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: mSource(aSource),
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mNext(nullptr),
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mRefCnt(0),
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mHashEntry(true)
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{
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MOZ_COUNT_CTOR(Assertion);
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NS_ADDREF(mSource);
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u.hash.mPropertyHash =
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new PLDHashTable(PLDHashTable::StubOps(), sizeof(Entry));
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}
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Assertion::Assertion(nsIRDFResource* aSource,
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nsIRDFResource* aProperty,
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nsIRDFNode* aTarget,
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bool aTruthValue)
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: mSource(aSource),
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mNext(nullptr),
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mRefCnt(0),
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mHashEntry(false)
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{
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MOZ_COUNT_CTOR(Assertion);
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u.as.mProperty = aProperty;
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u.as.mTarget = aTarget;
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NS_ADDREF(mSource);
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NS_ADDREF(u.as.mProperty);
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NS_ADDREF(u.as.mTarget);
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u.as.mInvNext = nullptr;
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u.as.mTruthValue = aTruthValue;
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u.as.mMarked = false;
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}
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Assertion::~Assertion()
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{
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if (mHashEntry && u.hash.mPropertyHash) {
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for (auto i = u.hash.mPropertyHash->Iter(); !i.Done(); i.Next()) {
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auto entry = static_cast<Entry*>(i.Get());
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Assertion* as = entry->mAssertions;
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while (as) {
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Assertion* doomed = as;
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as = as->mNext;
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// Unlink, and release the datasource's reference.
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doomed->mNext = doomed->u.as.mInvNext = nullptr;
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doomed->Release();
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}
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}
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delete u.hash.mPropertyHash;
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u.hash.mPropertyHash = nullptr;
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}
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MOZ_COUNT_DTOR(Assertion);
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#ifdef DEBUG_REFS
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--gInstanceCount;
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fprintf(stdout, "%d - RDF: Assertion\n", gInstanceCount);
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#endif
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NS_RELEASE(mSource);
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if (!mHashEntry)
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{
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NS_RELEASE(u.as.mProperty);
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NS_RELEASE(u.as.mTarget);
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}
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}
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////////////////////////////////////////////////////////////////////////
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// InMemoryDataSource
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class InMemoryArcsEnumeratorImpl;
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class InMemoryAssertionEnumeratorImpl;
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class InMemoryResourceEnumeratorImpl;
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class InMemoryDataSource : public nsIRDFDataSource,
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public nsIRDFInMemoryDataSource,
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public nsIRDFPropagatableDataSource,
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public nsIRDFPurgeableDataSource,
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public rdfIDataSource
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{
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protected:
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// These hash tables are keyed on pointers to nsIRDFResource
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// objects (the nsIRDFService ensures that there is only ever one
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// nsIRDFResource object per unique URI). The value of an entry is
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// an Assertion struct, which is a linked list of (subject
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// predicate object) triples.
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PLDHashTable mForwardArcs;
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PLDHashTable mReverseArcs;
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nsCOMArray<nsIRDFObserver> mObservers;
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uint32_t mNumObservers;
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// VisitFoo needs to block writes, [Un]Assert only allowed
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// during mReadCount == 0
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uint32_t mReadCount;
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friend class InMemoryArcsEnumeratorImpl;
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friend class InMemoryAssertionEnumeratorImpl;
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friend class InMemoryResourceEnumeratorImpl; // b/c it needs to enumerate mForwardArcs
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// Thread-safe writer implementation methods.
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nsresult
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LockedAssert(nsIRDFResource* source,
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nsIRDFResource* property,
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nsIRDFNode* target,
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bool tv);
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nsresult
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LockedUnassert(nsIRDFResource* source,
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nsIRDFResource* property,
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nsIRDFNode* target);
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explicit InMemoryDataSource(nsISupports* aOuter);
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virtual ~InMemoryDataSource();
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friend nsresult
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NS_NewRDFInMemoryDataSource(nsISupports* aOuter, const nsIID& aIID, void** aResult);
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public:
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NS_DECL_CYCLE_COLLECTING_AGGREGATED
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NS_DECL_AGGREGATED_CYCLE_COLLECTION_CLASS(InMemoryDataSource)
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// nsIRDFDataSource methods
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NS_DECL_NSIRDFDATASOURCE
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// nsIRDFInMemoryDataSource methods
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NS_DECL_NSIRDFINMEMORYDATASOURCE
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// nsIRDFPropagatableDataSource methods
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NS_DECL_NSIRDFPROPAGATABLEDATASOURCE
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// nsIRDFPurgeableDataSource methods
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NS_DECL_NSIRDFPURGEABLEDATASOURCE
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// rdfIDataSource methods
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NS_DECL_RDFIDATASOURCE
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protected:
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struct SweepInfo {
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Assertion* mUnassertList;
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PLDHashTable* mReverseArcs;
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};
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static void
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SweepForwardArcsEntries(PLDHashTable* aTable, SweepInfo* aArg);
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public:
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// Implementation methods
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Assertion*
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GetForwardArcs(nsIRDFResource* u) {
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PLDHashEntryHdr* hdr = mForwardArcs.Search(u);
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return hdr ? static_cast<Entry*>(hdr)->mAssertions : nullptr;
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}
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Assertion*
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GetReverseArcs(nsIRDFNode* v) {
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PLDHashEntryHdr* hdr = mReverseArcs.Search(v);
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return hdr ? static_cast<Entry*>(hdr)->mAssertions : nullptr;
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}
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void
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SetForwardArcs(nsIRDFResource* u, Assertion* as) {
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if (as) {
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auto entry =
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static_cast<Entry*>(mForwardArcs.Add(u, mozilla::fallible));
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if (entry) {
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entry->mNode = u;
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entry->mAssertions = as;
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}
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}
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else {
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mForwardArcs.Remove(u);
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}
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}
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void
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SetReverseArcs(nsIRDFNode* v, Assertion* as) {
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if (as) {
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auto entry =
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static_cast<Entry*>(mReverseArcs.Add(v, mozilla::fallible));
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if (entry) {
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entry->mNode = v;
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entry->mAssertions = as;
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}
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}
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else {
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mReverseArcs.Remove(v);
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}
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}
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void
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LogOperation(const char* aOperation,
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nsIRDFResource* asource,
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nsIRDFResource* aProperty,
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nsIRDFNode* aTarget,
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bool aTruthValue = true);
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bool mPropagateChanges;
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private:
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static mozilla::LazyLogModule gLog;
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};
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mozilla::LazyLogModule InMemoryDataSource::gLog("InMemoryDataSource");
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//----------------------------------------------------------------------
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//
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// InMemoryAssertionEnumeratorImpl
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//
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/**
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* InMemoryAssertionEnumeratorImpl
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*/
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class InMemoryAssertionEnumeratorImpl : public nsISimpleEnumerator
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{
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private:
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InMemoryDataSource* mDataSource;
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nsIRDFResource* mSource;
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nsIRDFResource* mProperty;
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nsIRDFNode* mTarget;
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nsIRDFNode* mValue;
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bool mTruthValue;
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Assertion* mNextAssertion;
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nsCOMPtr<nsISupportsArray> mHashArcs;
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virtual ~InMemoryAssertionEnumeratorImpl();
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public:
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InMemoryAssertionEnumeratorImpl(InMemoryDataSource* aDataSource,
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nsIRDFResource* aSource,
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nsIRDFResource* aProperty,
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nsIRDFNode* aTarget,
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bool aTruthValue);
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// nsISupports interface
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NS_DECL_ISUPPORTS
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// nsISimpleEnumerator interface
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NS_DECL_NSISIMPLEENUMERATOR
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};
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////////////////////////////////////////////////////////////////////////
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InMemoryAssertionEnumeratorImpl::InMemoryAssertionEnumeratorImpl(
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InMemoryDataSource* aDataSource,
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nsIRDFResource* aSource,
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nsIRDFResource* aProperty,
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nsIRDFNode* aTarget,
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bool aTruthValue)
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: mDataSource(aDataSource),
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mSource(aSource),
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mProperty(aProperty),
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mTarget(aTarget),
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mValue(nullptr),
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mTruthValue(aTruthValue),
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mNextAssertion(nullptr)
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{
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NS_ADDREF(mDataSource);
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NS_IF_ADDREF(mSource);
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NS_ADDREF(mProperty);
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NS_IF_ADDREF(mTarget);
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if (mSource) {
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mNextAssertion = mDataSource->GetForwardArcs(mSource);
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if (mNextAssertion && mNextAssertion->mHashEntry) {
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// its our magical HASH_ENTRY forward hash for assertions
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PLDHashEntryHdr* hdr =
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mNextAssertion->u.hash.mPropertyHash->Search(aProperty);
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mNextAssertion =
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hdr ? static_cast<Entry*>(hdr)->mAssertions : nullptr;
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}
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}
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else {
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mNextAssertion = mDataSource->GetReverseArcs(mTarget);
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}
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// Add an owning reference from the enumerator
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if (mNextAssertion)
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mNextAssertion->AddRef();
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}
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InMemoryAssertionEnumeratorImpl::~InMemoryAssertionEnumeratorImpl()
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{
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#ifdef DEBUG_REFS
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--gInstanceCount;
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fprintf(stdout, "%d - RDF: InMemoryAssertionEnumeratorImpl\n", gInstanceCount);
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#endif
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if (mNextAssertion)
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mNextAssertion->Release();
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NS_IF_RELEASE(mDataSource);
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NS_IF_RELEASE(mSource);
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NS_IF_RELEASE(mProperty);
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NS_IF_RELEASE(mTarget);
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NS_IF_RELEASE(mValue);
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}
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NS_IMPL_ADDREF(InMemoryAssertionEnumeratorImpl)
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NS_IMPL_RELEASE(InMemoryAssertionEnumeratorImpl)
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NS_IMPL_QUERY_INTERFACE(InMemoryAssertionEnumeratorImpl, nsISimpleEnumerator)
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NS_IMETHODIMP
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InMemoryAssertionEnumeratorImpl::HasMoreElements(bool* aResult)
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{
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if (mValue) {
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*aResult = true;
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return NS_OK;
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}
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while (mNextAssertion) {
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bool foundIt = false;
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if ((mProperty == mNextAssertion->u.as.mProperty) &&
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(mTruthValue == mNextAssertion->u.as.mTruthValue)) {
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if (mSource) {
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mValue = mNextAssertion->u.as.mTarget;
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NS_ADDREF(mValue);
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}
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else {
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mValue = mNextAssertion->mSource;
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NS_ADDREF(mValue);
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}
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foundIt = true;
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}
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// Remember the last assertion we were holding on to
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Assertion* as = mNextAssertion;
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// iterate
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mNextAssertion = (mSource) ? mNextAssertion->mNext : mNextAssertion->u.as.mInvNext;
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// grab an owning reference from the enumerator to the next assertion
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if (mNextAssertion)
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mNextAssertion->AddRef();
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// ...and release the reference from the enumerator to the old one.
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as->Release();
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if (foundIt) {
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*aResult = true;
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return NS_OK;
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}
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}
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*aResult = false;
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return NS_OK;
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}
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NS_IMETHODIMP
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InMemoryAssertionEnumeratorImpl::GetNext(nsISupports** aResult)
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{
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nsresult rv;
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bool hasMore;
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rv = HasMoreElements(&hasMore);
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if (NS_FAILED(rv)) return rv;
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if (! hasMore)
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return NS_ERROR_UNEXPECTED;
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// Don't AddRef: we "transfer" ownership to the caller
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*aResult = mValue;
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mValue = nullptr;
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return NS_OK;
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}
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////////////////////////////////////////////////////////////////////////
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//
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/**
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* This class is a little bit bizarre in that it implements both the
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* <tt>nsIRDFArcsOutCursor</tt> and <tt>nsIRDFArcsInCursor</tt> interfaces.
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* Because the structure of the in-memory graph is pretty flexible, it's
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* fairly easy to parameterize this class. The only funky thing to watch
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* out for is the multiple inheritance clashes.
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*/
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class InMemoryArcsEnumeratorImpl : public nsISimpleEnumerator
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{
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private:
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InMemoryDataSource* mDataSource;
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nsIRDFResource* mSource;
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nsIRDFNode* mTarget;
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AutoTArray<nsCOMPtr<nsIRDFResource>, 8> mAlreadyReturned;
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nsIRDFResource* mCurrent;
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Assertion* mAssertion;
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nsCOMPtr<nsISupportsArray> mHashArcs;
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virtual ~InMemoryArcsEnumeratorImpl();
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public:
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InMemoryArcsEnumeratorImpl(InMemoryDataSource* aDataSource,
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nsIRDFResource* aSource,
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nsIRDFNode* aTarget);
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// nsISupports interface
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NS_DECL_ISUPPORTS
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// nsISimpleEnumerator interface
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NS_DECL_NSISIMPLEENUMERATOR
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};
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InMemoryArcsEnumeratorImpl::InMemoryArcsEnumeratorImpl(InMemoryDataSource* aDataSource,
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nsIRDFResource* aSource,
|
|
nsIRDFNode* aTarget)
|
|
: mDataSource(aDataSource),
|
|
mSource(aSource),
|
|
mTarget(aTarget),
|
|
mCurrent(nullptr)
|
|
{
|
|
NS_ADDREF(mDataSource);
|
|
NS_IF_ADDREF(mSource);
|
|
NS_IF_ADDREF(mTarget);
|
|
|
|
if (mSource) {
|
|
// cast okay because it's a closed system
|
|
mAssertion = mDataSource->GetForwardArcs(mSource);
|
|
|
|
if (mAssertion && mAssertion->mHashEntry) {
|
|
// its our magical HASH_ENTRY forward hash for assertions
|
|
nsresult rv = NS_NewISupportsArray(getter_AddRefs(mHashArcs));
|
|
if (NS_SUCCEEDED(rv)) {
|
|
nsISupportsArray* resources = mHashArcs.get();
|
|
for (auto i = mAssertion->u.hash.mPropertyHash->Iter();
|
|
!i.Done();
|
|
i.Next()) {
|
|
auto entry = static_cast<Entry*>(i.Get());
|
|
resources->AppendElement(entry->mNode);
|
|
}
|
|
}
|
|
mAssertion = nullptr;
|
|
}
|
|
}
|
|
else {
|
|
mAssertion = mDataSource->GetReverseArcs(mTarget);
|
|
}
|
|
}
|
|
|
|
InMemoryArcsEnumeratorImpl::~InMemoryArcsEnumeratorImpl()
|
|
{
|
|
#ifdef DEBUG_REFS
|
|
--gInstanceCount;
|
|
fprintf(stdout, "%d - RDF: InMemoryArcsEnumeratorImpl\n", gInstanceCount);
|
|
#endif
|
|
|
|
NS_RELEASE(mDataSource);
|
|
NS_IF_RELEASE(mSource);
|
|
NS_IF_RELEASE(mTarget);
|
|
NS_IF_RELEASE(mCurrent);
|
|
}
|
|
|
|
NS_IMPL_ADDREF(InMemoryArcsEnumeratorImpl)
|
|
NS_IMPL_RELEASE(InMemoryArcsEnumeratorImpl)
|
|
NS_IMPL_QUERY_INTERFACE(InMemoryArcsEnumeratorImpl, nsISimpleEnumerator)
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryArcsEnumeratorImpl::HasMoreElements(bool* aResult)
|
|
{
|
|
NS_PRECONDITION(aResult != nullptr, "null ptr");
|
|
if (! aResult)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
if (mCurrent) {
|
|
*aResult = true;
|
|
return NS_OK;
|
|
}
|
|
|
|
if (mHashArcs) {
|
|
uint32_t itemCount;
|
|
nsresult rv;
|
|
if (NS_FAILED(rv = mHashArcs->Count(&itemCount))) return(rv);
|
|
if (itemCount > 0) {
|
|
--itemCount;
|
|
nsCOMPtr<nsIRDFResource> tmp = do_QueryElementAt(mHashArcs, itemCount);
|
|
tmp.forget(&mCurrent);
|
|
mHashArcs->RemoveElementAt(itemCount);
|
|
*aResult = true;
|
|
return NS_OK;
|
|
}
|
|
}
|
|
else
|
|
while (mAssertion) {
|
|
nsIRDFResource* next = mAssertion->u.as.mProperty;
|
|
|
|
// "next" is the property arc we are tentatively going to return
|
|
// in a subsequent GetNext() call. It is important to do two
|
|
// things, however, before that can happen:
|
|
// 1) Make sure it's not an arc we've already returned.
|
|
// 2) Make sure that |mAssertion| is not left pointing to
|
|
// another assertion that has the same property as this one.
|
|
// The first is a practical concern; the second a defense against
|
|
// an obscure crash and other erratic behavior. To ensure the
|
|
// second condition, skip down the chain until we find the next
|
|
// assertion with a property that doesn't match the current one.
|
|
// (All these assertions would be skipped via mAlreadyReturned
|
|
// checks anyways; this is even a bit faster.)
|
|
|
|
do {
|
|
mAssertion = (mSource ? mAssertion->mNext :
|
|
mAssertion->u.as.mInvNext);
|
|
}
|
|
while (mAssertion && (next == mAssertion->u.as.mProperty));
|
|
|
|
bool alreadyReturned = false;
|
|
for (int32_t i = mAlreadyReturned.Length() - 1; i >= 0; --i) {
|
|
if (mAlreadyReturned[i] == next) {
|
|
alreadyReturned = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (! alreadyReturned) {
|
|
mCurrent = next;
|
|
NS_ADDREF(mCurrent);
|
|
*aResult = true;
|
|
return NS_OK;
|
|
}
|
|
}
|
|
|
|
*aResult = false;
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryArcsEnumeratorImpl::GetNext(nsISupports** aResult)
|
|
{
|
|
nsresult rv;
|
|
|
|
bool hasMore;
|
|
rv = HasMoreElements(&hasMore);
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
if (! hasMore)
|
|
return NS_ERROR_UNEXPECTED;
|
|
|
|
// Add this to the set of things we've already returned so that we
|
|
// can ensure uniqueness
|
|
mAlreadyReturned.AppendElement(mCurrent);
|
|
|
|
// Don't AddRef: we "transfer" ownership to the caller
|
|
*aResult = mCurrent;
|
|
mCurrent = nullptr;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// InMemoryDataSource
|
|
|
|
nsresult
|
|
NS_NewRDFInMemoryDataSource(nsISupports* aOuter, const nsIID& aIID, void** aResult)
|
|
{
|
|
NS_PRECONDITION(aResult != nullptr, "null ptr");
|
|
if (! aResult)
|
|
return NS_ERROR_NULL_POINTER;
|
|
*aResult = nullptr;
|
|
|
|
if (aOuter && !aIID.Equals(NS_GET_IID(nsISupports))) {
|
|
NS_ERROR("aggregation requires nsISupports");
|
|
return NS_ERROR_ILLEGAL_VALUE;
|
|
}
|
|
|
|
InMemoryDataSource* datasource = new InMemoryDataSource(aOuter);
|
|
NS_ADDREF(datasource);
|
|
|
|
datasource->fAggregated.AddRef();
|
|
nsresult rv = datasource->AggregatedQueryInterface(aIID, aResult); // This'll AddRef()
|
|
datasource->fAggregated.Release();
|
|
|
|
NS_RELEASE(datasource);
|
|
return rv;
|
|
}
|
|
|
|
|
|
InMemoryDataSource::InMemoryDataSource(nsISupports* aOuter)
|
|
: mForwardArcs(PLDHashTable::StubOps(), sizeof(Entry))
|
|
, mReverseArcs(PLDHashTable::StubOps(), sizeof(Entry))
|
|
, mNumObservers(0)
|
|
, mReadCount(0)
|
|
{
|
|
NS_INIT_AGGREGATED(aOuter);
|
|
|
|
mPropagateChanges = true;
|
|
MOZ_COUNT_CTOR(InMemoryDataSource);
|
|
}
|
|
|
|
|
|
InMemoryDataSource::~InMemoryDataSource()
|
|
{
|
|
#ifdef DEBUG_REFS
|
|
--gInstanceCount;
|
|
fprintf(stdout, "%d - RDF: InMemoryDataSource\n", gInstanceCount);
|
|
#endif
|
|
|
|
if (mForwardArcs.EntryCount() > 0) {
|
|
// This'll release all of the Assertion objects that are
|
|
// associated with this data source. We only need to do this
|
|
// for the forward arcs, because the reverse arcs table
|
|
// indexes the exact same set of resources.
|
|
for (auto iter = mForwardArcs.Iter(); !iter.Done(); iter.Next()) {
|
|
auto entry = static_cast<Entry*>(iter.Get());
|
|
Assertion* as = entry->mAssertions;
|
|
while (as) {
|
|
Assertion* doomed = as;
|
|
as = as->mNext;
|
|
|
|
// Unlink, and release the datasource's reference.
|
|
doomed->mNext = doomed->u.as.mInvNext = nullptr;
|
|
doomed->Release();
|
|
}
|
|
}
|
|
}
|
|
|
|
MOZ_LOG(gLog, LogLevel::Debug,
|
|
("InMemoryDataSource(%p): destroyed.", this));
|
|
|
|
MOZ_COUNT_DTOR(InMemoryDataSource);
|
|
}
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
|
|
NS_IMPL_CYCLE_COLLECTION_CLASS(InMemoryDataSource)
|
|
|
|
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(InMemoryDataSource)
|
|
NS_IMPL_CYCLE_COLLECTION_UNLINK(mObservers)
|
|
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
|
|
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_AGGREGATED(InMemoryDataSource)
|
|
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mObservers)
|
|
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
|
|
|
|
NS_IMPL_CYCLE_COLLECTING_AGGREGATED(InMemoryDataSource)
|
|
NS_INTERFACE_MAP_BEGIN_AGGREGATED(InMemoryDataSource)
|
|
NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION_AGGREGATED(InMemoryDataSource)
|
|
NS_INTERFACE_MAP_ENTRY(nsIRDFDataSource)
|
|
NS_INTERFACE_MAP_ENTRY(nsIRDFInMemoryDataSource)
|
|
NS_INTERFACE_MAP_ENTRY(nsIRDFPropagatableDataSource)
|
|
NS_INTERFACE_MAP_ENTRY(nsIRDFPurgeableDataSource)
|
|
NS_INTERFACE_MAP_ENTRY(rdfIDataSource)
|
|
NS_INTERFACE_MAP_END
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
void
|
|
InMemoryDataSource::LogOperation(const char* aOperation,
|
|
nsIRDFResource* aSource,
|
|
nsIRDFResource* aProperty,
|
|
nsIRDFNode* aTarget,
|
|
bool aTruthValue)
|
|
{
|
|
if (! MOZ_LOG_TEST(gLog, LogLevel::Debug))
|
|
return;
|
|
|
|
nsXPIDLCString uri;
|
|
aSource->GetValue(getter_Copies(uri));
|
|
PR_LogPrint
|
|
("InMemoryDataSource(%p): %s", this, aOperation);
|
|
|
|
PR_LogPrint
|
|
(" [(%p)%s]--", aSource, (const char*) uri);
|
|
|
|
aProperty->GetValue(getter_Copies(uri));
|
|
|
|
char tv = (aTruthValue ? '-' : '!');
|
|
PR_LogPrint
|
|
(" --%c[(%p)%s]--", tv, aProperty, (const char*) uri);
|
|
|
|
nsCOMPtr<nsIRDFResource> resource;
|
|
nsCOMPtr<nsIRDFLiteral> literal;
|
|
|
|
if ((resource = do_QueryInterface(aTarget)) != nullptr) {
|
|
resource->GetValue(getter_Copies(uri));
|
|
PR_LogPrint
|
|
(" -->[(%p)%s]", aTarget, (const char*) uri);
|
|
}
|
|
else if ((literal = do_QueryInterface(aTarget)) != nullptr) {
|
|
nsXPIDLString value;
|
|
literal->GetValue(getter_Copies(value));
|
|
nsAutoString valueStr(value);
|
|
char* valueCStr = ToNewCString(valueStr);
|
|
|
|
PR_LogPrint
|
|
(" -->(\"%s\")\n", valueCStr);
|
|
|
|
free(valueCStr);
|
|
}
|
|
else {
|
|
PR_LogPrint
|
|
(" -->(unknown-type)\n");
|
|
}
|
|
}
|
|
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::GetURI(char* *uri)
|
|
{
|
|
NS_PRECONDITION(uri != nullptr, "null ptr");
|
|
if (! uri)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
*uri = nullptr;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::GetSource(nsIRDFResource* property,
|
|
nsIRDFNode* target,
|
|
bool tv,
|
|
nsIRDFResource** source)
|
|
{
|
|
NS_PRECONDITION(source != nullptr, "null ptr");
|
|
if (! source)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(property != nullptr, "null ptr");
|
|
if (! property)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(target != nullptr, "null ptr");
|
|
if (! target)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
for (Assertion* as = GetReverseArcs(target); as; as = as->u.as.mInvNext) {
|
|
if ((property == as->u.as.mProperty) && (tv == as->u.as.mTruthValue)) {
|
|
*source = as->mSource;
|
|
NS_ADDREF(*source);
|
|
return NS_OK;
|
|
}
|
|
}
|
|
*source = nullptr;
|
|
return NS_RDF_NO_VALUE;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::GetTarget(nsIRDFResource* source,
|
|
nsIRDFResource* property,
|
|
bool tv,
|
|
nsIRDFNode** target)
|
|
{
|
|
NS_PRECONDITION(source != nullptr, "null ptr");
|
|
if (! source)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(property != nullptr, "null ptr");
|
|
if (! property)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(target != nullptr, "null ptr");
|
|
if (! target)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
Assertion *as = GetForwardArcs(source);
|
|
if (as && as->mHashEntry) {
|
|
PLDHashEntryHdr* hdr = as->u.hash.mPropertyHash->Search(property);
|
|
Assertion* val = hdr ? static_cast<Entry*>(hdr)->mAssertions : nullptr;
|
|
while (val) {
|
|
if (tv == val->u.as.mTruthValue) {
|
|
*target = val->u.as.mTarget;
|
|
NS_IF_ADDREF(*target);
|
|
return NS_OK;
|
|
}
|
|
val = val->mNext;
|
|
}
|
|
}
|
|
else
|
|
for (; as != nullptr; as = as->mNext) {
|
|
if ((property == as->u.as.mProperty) && (tv == (as->u.as.mTruthValue))) {
|
|
*target = as->u.as.mTarget;
|
|
NS_ADDREF(*target);
|
|
return NS_OK;
|
|
}
|
|
}
|
|
|
|
// If we get here, then there was no target with for the specified
|
|
// property & truth value.
|
|
*target = nullptr;
|
|
return NS_RDF_NO_VALUE;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::HasAssertion(nsIRDFResource* source,
|
|
nsIRDFResource* property,
|
|
nsIRDFNode* target,
|
|
bool tv,
|
|
bool* hasAssertion)
|
|
{
|
|
if (! source)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
if (! property)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
if (! target)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
Assertion *as = GetForwardArcs(source);
|
|
if (as && as->mHashEntry) {
|
|
PLDHashEntryHdr* hdr = as->u.hash.mPropertyHash->Search(property);
|
|
Assertion* val = hdr ? static_cast<Entry*>(hdr)->mAssertions : nullptr;
|
|
while (val) {
|
|
if ((val->u.as.mTarget == target) && (tv == (val->u.as.mTruthValue))) {
|
|
*hasAssertion = true;
|
|
return NS_OK;
|
|
}
|
|
val = val->mNext;
|
|
}
|
|
}
|
|
else
|
|
for (; as != nullptr; as = as->mNext) {
|
|
// check target first as its most unique
|
|
if (target != as->u.as.mTarget)
|
|
continue;
|
|
|
|
if (property != as->u.as.mProperty)
|
|
continue;
|
|
|
|
if (tv != (as->u.as.mTruthValue))
|
|
continue;
|
|
|
|
// found it!
|
|
*hasAssertion = true;
|
|
return NS_OK;
|
|
}
|
|
|
|
// If we get here, we couldn't find the assertion
|
|
*hasAssertion = false;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::GetSources(nsIRDFResource* aProperty,
|
|
nsIRDFNode* aTarget,
|
|
bool aTruthValue,
|
|
nsISimpleEnumerator** aResult)
|
|
{
|
|
NS_PRECONDITION(aProperty != nullptr, "null ptr");
|
|
if (! aProperty)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aTarget != nullptr, "null ptr");
|
|
if (! aTarget)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aResult != nullptr, "null ptr");
|
|
if (! aResult)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
InMemoryAssertionEnumeratorImpl* result =
|
|
new InMemoryAssertionEnumeratorImpl(this, nullptr, aProperty,
|
|
aTarget, aTruthValue);
|
|
|
|
if (! result)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
NS_ADDREF(result);
|
|
*aResult = result;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::GetTargets(nsIRDFResource* aSource,
|
|
nsIRDFResource* aProperty,
|
|
bool aTruthValue,
|
|
nsISimpleEnumerator** aResult)
|
|
{
|
|
NS_PRECONDITION(aSource != nullptr, "null ptr");
|
|
if (! aSource)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aProperty != nullptr, "null ptr");
|
|
if (! aProperty)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aResult != nullptr, "null ptr");
|
|
if (! aResult)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
InMemoryAssertionEnumeratorImpl* result =
|
|
new InMemoryAssertionEnumeratorImpl(this, aSource, aProperty,
|
|
nullptr, aTruthValue);
|
|
|
|
if (! result)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
NS_ADDREF(result);
|
|
*aResult = result;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
nsresult
|
|
InMemoryDataSource::LockedAssert(nsIRDFResource* aSource,
|
|
nsIRDFResource* aProperty,
|
|
nsIRDFNode* aTarget,
|
|
bool aTruthValue)
|
|
{
|
|
LogOperation("ASSERT", aSource, aProperty, aTarget, aTruthValue);
|
|
|
|
Assertion* next = GetForwardArcs(aSource);
|
|
Assertion* prev = next;
|
|
Assertion* as = nullptr;
|
|
|
|
bool haveHash = (next) ? next->mHashEntry : false;
|
|
if (haveHash) {
|
|
PLDHashEntryHdr* hdr = next->u.hash.mPropertyHash->Search(aProperty);
|
|
Assertion* val = hdr ? static_cast<Entry*>(hdr)->mAssertions : nullptr;
|
|
while (val) {
|
|
if (val->u.as.mTarget == aTarget) {
|
|
// Wow, we already had the assertion. Make sure that the
|
|
// truth values are correct and bail.
|
|
val->u.as.mTruthValue = aTruthValue;
|
|
return NS_OK;
|
|
}
|
|
val = val->mNext;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (next) {
|
|
// check target first as its most unique
|
|
if (aTarget == next->u.as.mTarget) {
|
|
if (aProperty == next->u.as.mProperty) {
|
|
// Wow, we already had the assertion. Make sure that the
|
|
// truth values are correct and bail.
|
|
next->u.as.mTruthValue = aTruthValue;
|
|
return NS_OK;
|
|
}
|
|
}
|
|
|
|
prev = next;
|
|
next = next->mNext;
|
|
}
|
|
}
|
|
|
|
as = new Assertion(aSource, aProperty, aTarget, aTruthValue);
|
|
if (! as)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
// Add the datasource's owning reference.
|
|
as->AddRef();
|
|
|
|
if (haveHash)
|
|
{
|
|
PLDHashEntryHdr* hdr = next->u.hash.mPropertyHash->Search(aProperty);
|
|
Assertion *asRef =
|
|
hdr ? static_cast<Entry*>(hdr)->mAssertions : nullptr;
|
|
if (asRef)
|
|
{
|
|
as->mNext = asRef->mNext;
|
|
asRef->mNext = as;
|
|
}
|
|
else
|
|
{
|
|
hdr = next->u.hash.mPropertyHash->Add(aProperty, mozilla::fallible);
|
|
if (hdr)
|
|
{
|
|
Entry* entry = static_cast<Entry*>(hdr);
|
|
entry->mNode = aProperty;
|
|
entry->mAssertions = as;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Link it in to the "forward arcs" table
|
|
if (!prev) {
|
|
SetForwardArcs(aSource, as);
|
|
} else {
|
|
prev->mNext = as;
|
|
}
|
|
}
|
|
|
|
// Link it in to the "reverse arcs" table
|
|
|
|
next = GetReverseArcs(aTarget);
|
|
as->u.as.mInvNext = next;
|
|
next = as;
|
|
SetReverseArcs(aTarget, next);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::Assert(nsIRDFResource* aSource,
|
|
nsIRDFResource* aProperty,
|
|
nsIRDFNode* aTarget,
|
|
bool aTruthValue)
|
|
{
|
|
NS_PRECONDITION(aSource != nullptr, "null ptr");
|
|
if (! aSource)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aProperty != nullptr, "null ptr");
|
|
if (! aProperty)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aTarget != nullptr, "null ptr");
|
|
if (! aTarget)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
if (mReadCount) {
|
|
NS_WARNING("Writing to InMemoryDataSource during read\n");
|
|
return NS_RDF_ASSERTION_REJECTED;
|
|
}
|
|
|
|
nsresult rv;
|
|
rv = LockedAssert(aSource, aProperty, aTarget, aTruthValue);
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
// notify observers
|
|
for (int32_t i = (int32_t)mNumObservers - 1; mPropagateChanges && i >= 0; --i) {
|
|
nsIRDFObserver* obs = mObservers[i];
|
|
|
|
// XXX this should never happen, but it does, and we can't figure out why.
|
|
NS_ASSERTION(obs, "observer array corrupted!");
|
|
if (! obs)
|
|
continue;
|
|
|
|
obs->OnAssert(this, aSource, aProperty, aTarget);
|
|
// XXX ignore return value?
|
|
}
|
|
|
|
return NS_RDF_ASSERTION_ACCEPTED;
|
|
}
|
|
|
|
|
|
nsresult
|
|
InMemoryDataSource::LockedUnassert(nsIRDFResource* aSource,
|
|
nsIRDFResource* aProperty,
|
|
nsIRDFNode* aTarget)
|
|
{
|
|
LogOperation("UNASSERT", aSource, aProperty, aTarget);
|
|
|
|
Assertion* next = GetForwardArcs(aSource);
|
|
Assertion* prev = next;
|
|
Assertion* root = next;
|
|
Assertion* as = nullptr;
|
|
|
|
bool haveHash = (next) ? next->mHashEntry : false;
|
|
if (haveHash) {
|
|
PLDHashEntryHdr* hdr = next->u.hash.mPropertyHash->Search(aProperty);
|
|
prev = next = hdr ? static_cast<Entry*>(hdr)->mAssertions : nullptr;
|
|
bool first = true;
|
|
while (next) {
|
|
if (aTarget == next->u.as.mTarget) {
|
|
break;
|
|
}
|
|
first = false;
|
|
prev = next;
|
|
next = next->mNext;
|
|
}
|
|
// We don't even have the assertion, so just bail.
|
|
if (!next)
|
|
return NS_OK;
|
|
|
|
as = next;
|
|
|
|
if (first) {
|
|
root->u.hash.mPropertyHash->RawRemove(hdr);
|
|
|
|
if (next && next->mNext) {
|
|
PLDHashEntryHdr* hdr =
|
|
root->u.hash.mPropertyHash->Add(aProperty,
|
|
mozilla::fallible);
|
|
if (hdr) {
|
|
Entry* entry = static_cast<Entry*>(hdr);
|
|
entry->mNode = aProperty;
|
|
entry->mAssertions = next->mNext;
|
|
}
|
|
}
|
|
else {
|
|
// If this second-level hash empties out, clean it up.
|
|
if (!root->u.hash.mPropertyHash->EntryCount()) {
|
|
root->Release();
|
|
SetForwardArcs(aSource, nullptr);
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
prev->mNext = next->mNext;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (next) {
|
|
// check target first as its most unique
|
|
if (aTarget == next->u.as.mTarget) {
|
|
if (aProperty == next->u.as.mProperty) {
|
|
if (prev == next) {
|
|
SetForwardArcs(aSource, next->mNext);
|
|
} else {
|
|
prev->mNext = next->mNext;
|
|
}
|
|
as = next;
|
|
break;
|
|
}
|
|
}
|
|
|
|
prev = next;
|
|
next = next->mNext;
|
|
}
|
|
}
|
|
// We don't even have the assertion, so just bail.
|
|
if (!as)
|
|
return NS_OK;
|
|
|
|
#ifdef DEBUG
|
|
bool foundReverseArc = false;
|
|
#endif
|
|
|
|
next = prev = GetReverseArcs(aTarget);
|
|
while (next) {
|
|
if (next == as) {
|
|
if (prev == next) {
|
|
SetReverseArcs(aTarget, next->u.as.mInvNext);
|
|
} else {
|
|
prev->u.as.mInvNext = next->u.as.mInvNext;
|
|
}
|
|
#ifdef DEBUG
|
|
foundReverseArc = true;
|
|
#endif
|
|
break;
|
|
}
|
|
prev = next;
|
|
next = next->u.as.mInvNext;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
NS_ASSERTION(foundReverseArc, "in-memory db corrupted: unable to find reverse arc");
|
|
#endif
|
|
|
|
// Unlink, and release the datasource's reference
|
|
as->mNext = as->u.as.mInvNext = nullptr;
|
|
as->Release();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::Unassert(nsIRDFResource* aSource,
|
|
nsIRDFResource* aProperty,
|
|
nsIRDFNode* aTarget)
|
|
{
|
|
NS_PRECONDITION(aSource != nullptr, "null ptr");
|
|
if (! aSource)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aProperty != nullptr, "null ptr");
|
|
if (! aProperty)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aTarget != nullptr, "null ptr");
|
|
if (! aTarget)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
if (mReadCount) {
|
|
NS_WARNING("Writing to InMemoryDataSource during read\n");
|
|
return NS_RDF_ASSERTION_REJECTED;
|
|
}
|
|
|
|
nsresult rv;
|
|
|
|
rv = LockedUnassert(aSource, aProperty, aTarget);
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
// Notify the world
|
|
for (int32_t i = int32_t(mNumObservers) - 1; mPropagateChanges && i >= 0; --i) {
|
|
nsIRDFObserver* obs = mObservers[i];
|
|
|
|
// XXX this should never happen, but it does, and we can't figure out why.
|
|
NS_ASSERTION(obs, "observer array corrupted!");
|
|
if (! obs)
|
|
continue;
|
|
|
|
obs->OnUnassert(this, aSource, aProperty, aTarget);
|
|
// XXX ignore return value?
|
|
}
|
|
|
|
return NS_RDF_ASSERTION_ACCEPTED;
|
|
}
|
|
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::Change(nsIRDFResource* aSource,
|
|
nsIRDFResource* aProperty,
|
|
nsIRDFNode* aOldTarget,
|
|
nsIRDFNode* aNewTarget)
|
|
{
|
|
NS_PRECONDITION(aSource != nullptr, "null ptr");
|
|
if (! aSource)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aProperty != nullptr, "null ptr");
|
|
if (! aProperty)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aOldTarget != nullptr, "null ptr");
|
|
if (! aOldTarget)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aNewTarget != nullptr, "null ptr");
|
|
if (! aNewTarget)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
if (mReadCount) {
|
|
NS_WARNING("Writing to InMemoryDataSource during read\n");
|
|
return NS_RDF_ASSERTION_REJECTED;
|
|
}
|
|
|
|
nsresult rv;
|
|
|
|
// XXX We can implement LockedChange() if we decide that this
|
|
// is a performance bottleneck.
|
|
|
|
rv = LockedUnassert(aSource, aProperty, aOldTarget);
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
rv = LockedAssert(aSource, aProperty, aNewTarget, true);
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
// Notify the world
|
|
for (int32_t i = int32_t(mNumObservers) - 1; mPropagateChanges && i >= 0; --i) {
|
|
nsIRDFObserver* obs = mObservers[i];
|
|
|
|
// XXX this should never happen, but it does, and we can't figure out why.
|
|
NS_ASSERTION(obs, "observer array corrupted!");
|
|
if (! obs)
|
|
continue;
|
|
|
|
obs->OnChange(this, aSource, aProperty, aOldTarget, aNewTarget);
|
|
// XXX ignore return value?
|
|
}
|
|
|
|
return NS_RDF_ASSERTION_ACCEPTED;
|
|
}
|
|
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::Move(nsIRDFResource* aOldSource,
|
|
nsIRDFResource* aNewSource,
|
|
nsIRDFResource* aProperty,
|
|
nsIRDFNode* aTarget)
|
|
{
|
|
NS_PRECONDITION(aOldSource != nullptr, "null ptr");
|
|
if (! aOldSource)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aNewSource != nullptr, "null ptr");
|
|
if (! aNewSource)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aProperty != nullptr, "null ptr");
|
|
if (! aProperty)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aTarget != nullptr, "null ptr");
|
|
if (! aTarget)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
if (mReadCount) {
|
|
NS_WARNING("Writing to InMemoryDataSource during read\n");
|
|
return NS_RDF_ASSERTION_REJECTED;
|
|
}
|
|
|
|
nsresult rv;
|
|
|
|
// XXX We can implement LockedMove() if we decide that this
|
|
// is a performance bottleneck.
|
|
|
|
rv = LockedUnassert(aOldSource, aProperty, aTarget);
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
rv = LockedAssert(aNewSource, aProperty, aTarget, true);
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
// Notify the world
|
|
for (int32_t i = int32_t(mNumObservers) - 1; mPropagateChanges && i >= 0; --i) {
|
|
nsIRDFObserver* obs = mObservers[i];
|
|
|
|
// XXX this should never happen, but it does, and we can't figure out why.
|
|
NS_ASSERTION(obs, "observer array corrupted!");
|
|
if (! obs)
|
|
continue;
|
|
|
|
obs->OnMove(this, aOldSource, aNewSource, aProperty, aTarget);
|
|
// XXX ignore return value?
|
|
}
|
|
|
|
return NS_RDF_ASSERTION_ACCEPTED;
|
|
}
|
|
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::AddObserver(nsIRDFObserver* aObserver)
|
|
{
|
|
NS_PRECONDITION(aObserver != nullptr, "null ptr");
|
|
if (! aObserver)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
mObservers.AppendObject(aObserver);
|
|
mNumObservers = mObservers.Count();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::RemoveObserver(nsIRDFObserver* aObserver)
|
|
{
|
|
NS_PRECONDITION(aObserver != nullptr, "null ptr");
|
|
if (! aObserver)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
mObservers.RemoveObject(aObserver);
|
|
// note: use Count() instead of just decrementing
|
|
// in case aObserver wasn't in list, for example
|
|
mNumObservers = mObservers.Count();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::HasArcIn(nsIRDFNode *aNode, nsIRDFResource *aArc, bool *result)
|
|
{
|
|
Assertion* ass = GetReverseArcs(aNode);
|
|
while (ass) {
|
|
nsIRDFResource* elbow = ass->u.as.mProperty;
|
|
if (elbow == aArc) {
|
|
*result = true;
|
|
return NS_OK;
|
|
}
|
|
ass = ass->u.as.mInvNext;
|
|
}
|
|
*result = false;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::HasArcOut(nsIRDFResource *aSource, nsIRDFResource *aArc, bool *result)
|
|
{
|
|
Assertion* ass = GetForwardArcs(aSource);
|
|
if (ass && ass->mHashEntry) {
|
|
PLDHashEntryHdr* hdr = ass->u.hash.mPropertyHash->Search(aArc);
|
|
Assertion* val = hdr ? static_cast<Entry*>(hdr)->mAssertions : nullptr;
|
|
if (val) {
|
|
*result = true;
|
|
return NS_OK;
|
|
}
|
|
ass = ass->mNext;
|
|
}
|
|
while (ass) {
|
|
nsIRDFResource* elbow = ass->u.as.mProperty;
|
|
if (elbow == aArc) {
|
|
*result = true;
|
|
return NS_OK;
|
|
}
|
|
ass = ass->mNext;
|
|
}
|
|
*result = false;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::ArcLabelsIn(nsIRDFNode* aTarget, nsISimpleEnumerator** aResult)
|
|
{
|
|
NS_PRECONDITION(aTarget != nullptr, "null ptr");
|
|
if (! aTarget)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
InMemoryArcsEnumeratorImpl* result =
|
|
new InMemoryArcsEnumeratorImpl(this, nullptr, aTarget);
|
|
|
|
if (! result)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
NS_ADDREF(result);
|
|
*aResult = result;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::ArcLabelsOut(nsIRDFResource* aSource, nsISimpleEnumerator** aResult)
|
|
{
|
|
NS_PRECONDITION(aSource != nullptr, "null ptr");
|
|
if (! aSource)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
InMemoryArcsEnumeratorImpl* result =
|
|
new InMemoryArcsEnumeratorImpl(this, aSource, nullptr);
|
|
|
|
if (! result)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
NS_ADDREF(result);
|
|
*aResult = result;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::GetAllResources(nsISimpleEnumerator** aResult)
|
|
{
|
|
nsCOMArray<nsIRDFNode> nodes;
|
|
nodes.SetCapacity(mForwardArcs.EntryCount());
|
|
|
|
// Get all of our entries into an nsCOMArray
|
|
for (auto iter = mForwardArcs.Iter(); !iter.Done(); iter.Next()) {
|
|
auto entry = static_cast<Entry*>(iter.Get());
|
|
nodes.AppendObject(entry->mNode);
|
|
}
|
|
return NS_NewArrayEnumerator(aResult, nodes);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::GetAllCmds(nsIRDFResource* source,
|
|
nsISimpleEnumerator/*<nsIRDFResource>*/** commands)
|
|
{
|
|
return(NS_NewEmptyEnumerator(commands));
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::IsCommandEnabled(nsISupportsArray/*<nsIRDFResource>*/* aSources,
|
|
nsIRDFResource* aCommand,
|
|
nsISupportsArray/*<nsIRDFResource>*/* aArguments,
|
|
bool* aResult)
|
|
{
|
|
*aResult = false;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::DoCommand(nsISupportsArray/*<nsIRDFResource>*/* aSources,
|
|
nsIRDFResource* aCommand,
|
|
nsISupportsArray/*<nsIRDFResource>*/* aArguments)
|
|
{
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::BeginUpdateBatch()
|
|
{
|
|
for (int32_t i = int32_t(mNumObservers) - 1; mPropagateChanges && i >= 0; --i) {
|
|
nsIRDFObserver* obs = mObservers[i];
|
|
obs->OnBeginUpdateBatch(this);
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::EndUpdateBatch()
|
|
{
|
|
for (int32_t i = int32_t(mNumObservers) - 1; mPropagateChanges && i >= 0; --i) {
|
|
nsIRDFObserver* obs = mObservers[i];
|
|
obs->OnEndUpdateBatch(this);
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// nsIRDFInMemoryDataSource methods
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::EnsureFastContainment(nsIRDFResource* aSource)
|
|
{
|
|
Assertion *as = GetForwardArcs(aSource);
|
|
bool haveHash = (as) ? as->mHashEntry : false;
|
|
|
|
// if its already a hash, then nothing to do
|
|
if (haveHash) return(NS_OK);
|
|
|
|
// convert aSource in forward hash into a hash
|
|
Assertion *hashAssertion = new Assertion(aSource);
|
|
NS_ASSERTION(hashAssertion, "unable to create Assertion");
|
|
if (!hashAssertion) return(NS_ERROR_OUT_OF_MEMORY);
|
|
|
|
// Add the datasource's owning reference.
|
|
hashAssertion->AddRef();
|
|
|
|
Assertion *first = GetForwardArcs(aSource);
|
|
SetForwardArcs(aSource, hashAssertion);
|
|
|
|
// mutate references of existing forward assertions into this hash
|
|
PLDHashTable *table = hashAssertion->u.hash.mPropertyHash;
|
|
Assertion *nextRef;
|
|
while(first) {
|
|
nextRef = first->mNext;
|
|
nsIRDFResource *prop = first->u.as.mProperty;
|
|
|
|
PLDHashEntryHdr* hdr = table->Search(prop);
|
|
Assertion* val = hdr ? static_cast<Entry*>(hdr)->mAssertions : nullptr;
|
|
if (val) {
|
|
first->mNext = val->mNext;
|
|
val->mNext = first;
|
|
}
|
|
else {
|
|
PLDHashEntryHdr* hdr = table->Add(prop, mozilla::fallible);
|
|
if (hdr) {
|
|
Entry* entry = static_cast<Entry*>(hdr);
|
|
entry->mNode = prop;
|
|
entry->mAssertions = first;
|
|
first->mNext = nullptr;
|
|
}
|
|
}
|
|
first = nextRef;
|
|
}
|
|
return(NS_OK);
|
|
}
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// nsIRDFPropagatableDataSource methods
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::GetPropagateChanges(bool* aPropagateChanges)
|
|
{
|
|
*aPropagateChanges = mPropagateChanges;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::SetPropagateChanges(bool aPropagateChanges)
|
|
{
|
|
mPropagateChanges = aPropagateChanges;
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// nsIRDFPurgeableDataSource methods
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::Mark(nsIRDFResource* aSource,
|
|
nsIRDFResource* aProperty,
|
|
nsIRDFNode* aTarget,
|
|
bool aTruthValue,
|
|
bool* aDidMark)
|
|
{
|
|
NS_PRECONDITION(aSource != nullptr, "null ptr");
|
|
if (! aSource)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aProperty != nullptr, "null ptr");
|
|
if (! aProperty)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
NS_PRECONDITION(aTarget != nullptr, "null ptr");
|
|
if (! aTarget)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
Assertion *as = GetForwardArcs(aSource);
|
|
if (as && as->mHashEntry) {
|
|
PLDHashEntryHdr* hdr = as->u.hash.mPropertyHash->Search(aProperty);
|
|
Assertion* val = hdr ? static_cast<Entry*>(hdr)->mAssertions : nullptr;
|
|
while (val) {
|
|
if ((val->u.as.mTarget == aTarget) &&
|
|
(aTruthValue == (val->u.as.mTruthValue))) {
|
|
|
|
// found it! so mark it.
|
|
as->Mark();
|
|
*aDidMark = true;
|
|
|
|
LogOperation("MARK", aSource, aProperty, aTarget, aTruthValue);
|
|
|
|
return NS_OK;
|
|
}
|
|
val = val->mNext;
|
|
}
|
|
}
|
|
else for (; as != nullptr; as = as->mNext) {
|
|
// check target first as its most unique
|
|
if (aTarget != as->u.as.mTarget)
|
|
continue;
|
|
|
|
if (aProperty != as->u.as.mProperty)
|
|
continue;
|
|
|
|
if (aTruthValue != (as->u.as.mTruthValue))
|
|
continue;
|
|
|
|
// found it! so mark it.
|
|
as->Mark();
|
|
*aDidMark = true;
|
|
|
|
LogOperation("MARK", aSource, aProperty, aTarget, aTruthValue);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
// If we get here, we couldn't find the assertion
|
|
*aDidMark = false;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::Sweep()
|
|
{
|
|
SweepInfo info = { nullptr, &mReverseArcs };
|
|
|
|
// Remove all the assertions, but don't notify anyone.
|
|
SweepForwardArcsEntries(&mForwardArcs, &info);
|
|
|
|
// Now do the notification.
|
|
Assertion* as = info.mUnassertList;
|
|
while (as) {
|
|
LogOperation("SWEEP", as->mSource, as->u.as.mProperty, as->u.as.mTarget, as->u.as.mTruthValue);
|
|
if (!(as->mHashEntry))
|
|
{
|
|
for (int32_t i = int32_t(mNumObservers) - 1; mPropagateChanges && i >= 0; --i) {
|
|
nsIRDFObserver* obs = mObservers[i];
|
|
// XXXbz other loops over mObservers null-check |obs| here!
|
|
obs->OnUnassert(this, as->mSource, as->u.as.mProperty, as->u.as.mTarget);
|
|
// XXX ignore return value?
|
|
}
|
|
}
|
|
|
|
Assertion* doomed = as;
|
|
as = as->mNext;
|
|
|
|
// Unlink, and release the datasource's reference
|
|
doomed->mNext = doomed->u.as.mInvNext = nullptr;
|
|
doomed->Release();
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
void
|
|
InMemoryDataSource::SweepForwardArcsEntries(PLDHashTable* aTable,
|
|
SweepInfo* aInfo)
|
|
{
|
|
for (auto iter = aTable->Iter(); !iter.Done(); iter.Next()) {
|
|
auto entry = static_cast<Entry*>(iter.Get());
|
|
|
|
Assertion* as = entry->mAssertions;
|
|
if (as && (as->mHashEntry)) {
|
|
// Stuff in sub-hashes must be swept recursively (max depth: 1)
|
|
SweepForwardArcsEntries(as->u.hash.mPropertyHash, aInfo);
|
|
|
|
// If the sub-hash is now empty, clean it up.
|
|
if (!as->u.hash.mPropertyHash->EntryCount()) {
|
|
as->Release();
|
|
iter.Remove();
|
|
}
|
|
continue;
|
|
}
|
|
|
|
Assertion* prev = nullptr;
|
|
while (as) {
|
|
if (as->IsMarked()) {
|
|
prev = as;
|
|
as->Unmark();
|
|
as = as->mNext;
|
|
}
|
|
else {
|
|
// remove from the list of assertions in the datasource
|
|
Assertion* next = as->mNext;
|
|
if (prev) {
|
|
prev->mNext = next;
|
|
}
|
|
else {
|
|
// it's the first one. update the hashtable entry.
|
|
entry->mAssertions = next;
|
|
}
|
|
|
|
// remove from the reverse arcs
|
|
PLDHashEntryHdr* hdr =
|
|
aInfo->mReverseArcs->Search(as->u.as.mTarget);
|
|
NS_ASSERTION(hdr, "no assertion in reverse arcs");
|
|
|
|
Entry* rentry = static_cast<Entry*>(hdr);
|
|
Assertion* ras = rentry->mAssertions;
|
|
Assertion* rprev = nullptr;
|
|
while (ras) {
|
|
if (ras == as) {
|
|
if (rprev) {
|
|
rprev->u.as.mInvNext = ras->u.as.mInvNext;
|
|
}
|
|
else {
|
|
// it's the first one. update the hashtable entry.
|
|
rentry->mAssertions = ras->u.as.mInvNext;
|
|
}
|
|
as->u.as.mInvNext = nullptr; // for my sanity.
|
|
break;
|
|
}
|
|
rprev = ras;
|
|
ras = ras->u.as.mInvNext;
|
|
}
|
|
|
|
// Wow, it was the _only_ one. Unhash it.
|
|
if (! rentry->mAssertions) {
|
|
aInfo->mReverseArcs->RawRemove(hdr);
|
|
}
|
|
|
|
// add to the list of assertions to unassert
|
|
as->mNext = aInfo->mUnassertList;
|
|
aInfo->mUnassertList = as;
|
|
|
|
// Advance to the next assertion
|
|
as = next;
|
|
}
|
|
}
|
|
|
|
// if no more assertions exist for this resource, then unhash it.
|
|
if (! entry->mAssertions) {
|
|
iter.Remove();
|
|
}
|
|
}
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
// rdfIDataSource methods
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::VisitAllSubjects(rdfITripleVisitor *aVisitor)
|
|
{
|
|
// Lock datasource against writes
|
|
++mReadCount;
|
|
|
|
// Enumerate all of our entries into an nsISupportsArray.
|
|
nsresult rv = NS_OK;
|
|
for (auto iter = mForwardArcs.Iter(); !iter.Done(); iter.Next()) {
|
|
auto entry = static_cast<Entry*>(iter.Get());
|
|
nsresult rv2;
|
|
nsCOMPtr<nsIRDFNode> subject = do_QueryInterface(entry->mNode, &rv2);
|
|
if (NS_FAILED(rv2)) {
|
|
NS_WARNING("QI to nsIRDFNode failed");
|
|
continue;
|
|
}
|
|
rv = aVisitor->Visit(subject, nullptr, nullptr, true);
|
|
if (NS_FAILED(rv) || rv == NS_RDF_STOP_VISIT) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Unlock datasource
|
|
--mReadCount;
|
|
|
|
return rv;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
InMemoryDataSource::VisitAllTriples(rdfITripleVisitor *aVisitor)
|
|
{
|
|
// Lock datasource against writes
|
|
++mReadCount;
|
|
|
|
// Enumerate all of our entries into an nsISupportsArray.
|
|
nsresult rv = NS_OK;
|
|
for (auto iter = mForwardArcs.Iter(); !iter.Done(); iter.Next()) {
|
|
auto entry = static_cast<Entry*>(iter.Get());
|
|
|
|
nsresult rv2;
|
|
nsCOMPtr<nsIRDFNode> subject = do_QueryInterface(entry->mNode, &rv2);
|
|
if (NS_FAILED(rv2)) {
|
|
NS_WARNING("QI to nsIRDFNode failed");
|
|
|
|
} else if (entry->mAssertions->mHashEntry) {
|
|
for (auto iter = entry->mAssertions->u.hash.mPropertyHash->Iter();
|
|
!iter.Done();
|
|
iter.Next()) {
|
|
auto entry = static_cast<Entry*>(iter.Get());
|
|
Assertion* assertion = entry->mAssertions;
|
|
while (assertion) {
|
|
NS_ASSERTION(!assertion->mHashEntry, "shouldn't have to hashes");
|
|
rv = aVisitor->Visit(subject, assertion->u.as.mProperty,
|
|
assertion->u.as.mTarget,
|
|
assertion->u.as.mTruthValue);
|
|
if (NS_FAILED(rv)) {
|
|
goto end;
|
|
}
|
|
if (rv == NS_RDF_STOP_VISIT) {
|
|
goto inner_end;
|
|
}
|
|
assertion = assertion->mNext;
|
|
}
|
|
}
|
|
|
|
} else {
|
|
Assertion* assertion = entry->mAssertions;
|
|
while (assertion) {
|
|
NS_ASSERTION(!assertion->mHashEntry, "shouldn't have to hashes");
|
|
rv = aVisitor->Visit(subject, assertion->u.as.mProperty,
|
|
assertion->u.as.mTarget,
|
|
assertion->u.as.mTruthValue);
|
|
if (NS_FAILED(rv) || rv == NS_RDF_STOP_VISIT) {
|
|
goto end;
|
|
}
|
|
assertion = assertion->mNext;
|
|
}
|
|
}
|
|
|
|
inner_end:
|
|
(void) 0;
|
|
}
|
|
|
|
end:
|
|
// Unlock datasource
|
|
--mReadCount;
|
|
|
|
return rv;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////
|
|
|