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247 lines
7.9 KiB
C++
247 lines
7.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=2 sts=2 expandtab
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Andrew Sutherland <asutherland@asutherland.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "StorageBaseStatementInternal.h"
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#include "nsProxyRelease.h"
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#include "mozStorageBindingParamsArray.h"
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#include "mozStorageStatementData.h"
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#include "mozStorageAsyncStatementExecution.h"
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namespace mozilla {
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namespace storage {
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////////////////////////////////////////////////////////////////////////////////
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//// Local Classes
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/**
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* Used to finalize an asynchronous statement on the background thread.
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*/
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class AsyncStatementFinalizer : public nsRunnable
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{
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public:
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/**
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* Constructor for the event.
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*
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* @param aStatement
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* We need the AsyncStatement to be able to get at the sqlite3_stmt;
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* we only access/create it on the async thread.
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* @param aConnection
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* We need the connection to know what thread to release the statement
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* on. We release the statement on that thread since releasing the
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* statement might end up releasing the connection too.
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*/
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AsyncStatementFinalizer(StorageBaseStatementInternal *aStatement,
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Connection *aConnection)
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: mStatement(aStatement)
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, mConnection(aConnection)
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{
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}
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NS_IMETHOD Run()
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{
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if (mStatement->mAsyncStatement) {
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(void)::sqlite3_finalize(mStatement->mAsyncStatement);
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mStatement->mAsyncStatement = nsnull;
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}
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(void)::NS_ProxyRelease(mConnection->threadOpenedOn, mStatement);
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return NS_OK;
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}
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private:
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nsRefPtr<StorageBaseStatementInternal> mStatement;
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nsRefPtr<Connection> mConnection;
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};
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/**
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* Finalize a sqlite3_stmt on the background thread for a statement whose
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* destructor was invoked and the statement was non-null.
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*/
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class LastDitchSqliteStatementFinalizer : public nsRunnable
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{
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public:
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/**
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* Event constructor.
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*
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* @param aConnection
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* Used to keep the connection alive. If we failed to do this, it
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* is possible that the statement going out of scope invoking us
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* might have the last reference to the connection and so trigger
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* an attempt to close the connection which is doomed to fail
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* (because the asynchronous execution thread must exist which will
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* trigger the failure case).
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* @param aStatement
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* The sqlite3_stmt to finalize. This object takes ownership /
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* responsibility for the instance and all other references to it
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* should be forgotten.
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*/
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LastDitchSqliteStatementFinalizer(nsRefPtr<Connection> &aConnection,
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sqlite3_stmt *aStatement)
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: mConnection(aConnection)
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, mAsyncStatement(aStatement)
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{
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NS_PRECONDITION(aConnection, "You must provide a Connection");
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}
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NS_IMETHOD Run()
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{
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(void)::sqlite3_finalize(mAsyncStatement);
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mAsyncStatement = nsnull;
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// Because of our ambiguous nsISupports we cannot use the NS_ProxyRelease
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// template helpers.
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Connection *rawConnection = nsnull;
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mConnection.swap(rawConnection);
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(void)::NS_ProxyRelease(
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rawConnection->threadOpenedOn,
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NS_ISUPPORTS_CAST(mozIStorageConnection *, rawConnection));
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return NS_OK;
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}
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private:
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nsRefPtr<Connection> mConnection;
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sqlite3_stmt *mAsyncStatement;
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};
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////////////////////////////////////////////////////////////////////////////////
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//// StorageBaseStatementInternal
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StorageBaseStatementInternal::StorageBaseStatementInternal()
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: mAsyncStatement(NULL)
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{
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}
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void
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StorageBaseStatementInternal::asyncFinalize()
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{
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nsIEventTarget *target = mDBConnection->getAsyncExecutionTarget();
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if (!target) {
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// If we cannot get the background thread, we have to assume it has been
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// shutdown (or is in the process of doing so). As a result, we should
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// just finalize it here and now.
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destructorAsyncFinalize();
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}
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else {
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nsCOMPtr<nsIRunnable> event =
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new AsyncStatementFinalizer(this, mDBConnection);
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// If the dispatching did not go as planned, finalize now.
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if (NS_FAILED(target->Dispatch(event, NS_DISPATCH_NORMAL))) {
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destructorAsyncFinalize();
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}
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}
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}
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void
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StorageBaseStatementInternal::destructorAsyncFinalize()
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{
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if (!mAsyncStatement)
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return;
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nsIEventTarget *target = mDBConnection->getAsyncExecutionTarget();
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if (target) {
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nsCOMPtr<nsIRunnable> event =
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new LastDitchSqliteStatementFinalizer(mDBConnection, mAsyncStatement);
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if (NS_SUCCEEDED(target->Dispatch(event, NS_DISPATCH_NORMAL))) {
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mAsyncStatement = nsnull;
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return;
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}
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}
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// (no async thread remains or we could not dispatch to it)
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(void)::sqlite3_finalize(mAsyncStatement);
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mAsyncStatement = nsnull;
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}
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NS_IMETHODIMP
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StorageBaseStatementInternal::NewBindingParamsArray(
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mozIStorageBindingParamsArray **_array
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)
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{
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nsCOMPtr<mozIStorageBindingParamsArray> array = new BindingParamsArray(this);
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NS_ENSURE_TRUE(array, NS_ERROR_OUT_OF_MEMORY);
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array.forget(_array);
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return NS_OK;
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}
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NS_IMETHODIMP
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StorageBaseStatementInternal::ExecuteAsync(
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mozIStorageStatementCallback *aCallback,
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mozIStoragePendingStatement **_stmt
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)
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{
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// We used to call Connection::ExecuteAsync but it takes a
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// mozIStorageBaseStatement signature because it is also a public API. Since
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// our 'this' has no static concept of mozIStorageBaseStatement and Connection
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// would just QI it back across to a StorageBaseStatementInternal and the
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// actual logic is very simple, we now roll our own.
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nsTArray<StatementData> stmts(1);
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StatementData data;
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nsresult rv = getAsynchronousStatementData(data);
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NS_ENSURE_SUCCESS(rv, rv);
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NS_ENSURE_TRUE(stmts.AppendElement(data), NS_ERROR_OUT_OF_MEMORY);
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// Dispatch to the background
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return AsyncExecuteStatements::execute(stmts, mDBConnection, aCallback,
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_stmt);
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}
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NS_IMETHODIMP
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StorageBaseStatementInternal::EscapeStringForLIKE(
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const nsAString &aValue,
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const PRUnichar aEscapeChar,
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nsAString &_escapedString
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)
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{
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const PRUnichar MATCH_ALL('%');
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const PRUnichar MATCH_ONE('_');
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_escapedString.Truncate(0);
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for (PRUint32 i = 0; i < aValue.Length(); i++) {
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if (aValue[i] == aEscapeChar || aValue[i] == MATCH_ALL ||
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aValue[i] == MATCH_ONE) {
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_escapedString += aEscapeChar;
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}
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_escapedString += aValue[i];
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}
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return NS_OK;
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}
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} // namespace storage
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} // namespace mozilla
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