gecko-dev/dom/indexedDB/IndexedDatabaseManager.h

410 lines
14 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Indexed Database.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Ben Turner <bent.mozilla@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef mozilla_dom_indexeddb_indexeddatabasemanager_h__
#define mozilla_dom_indexeddb_indexeddatabasemanager_h__
#include "mozilla/dom/indexedDB/FileManager.h"
#include "mozilla/dom/indexedDB/IndexedDatabase.h"
#include "mozilla/dom/indexedDB/IDBDatabase.h"
#include "mozilla/dom/indexedDB/IDBRequest.h"
#include "mozilla/Mutex.h"
#include "nsIIndexedDatabaseManager.h"
#include "nsIObserver.h"
#include "nsIRunnable.h"
#include "nsIThread.h"
#include "nsIURI.h"
#include "nsClassHashtable.h"
#include "nsRefPtrHashtable.h"
#include "nsHashKeys.h"
#define INDEXEDDB_MANAGER_CONTRACTID "@mozilla.org/dom/indexeddb/manager;1"
class mozIStorageQuotaCallback;
class nsITimer;
BEGIN_INDEXEDDB_NAMESPACE
class AsyncConnectionHelper;
class CheckQuotaHelper;
class IndexedDatabaseManager : public nsIIndexedDatabaseManager,
public nsIObserver
{
friend class IDBDatabase;
public:
static already_AddRefed<IndexedDatabaseManager> GetOrCreate();
// Returns a non-owning reference.
static IndexedDatabaseManager* Get();
// Returns an owning reference! No one should call this but the factory.
static IndexedDatabaseManager* FactoryCreate();
NS_DECL_ISUPPORTS
NS_DECL_NSIINDEXEDDATABASEMANAGER
NS_DECL_NSIOBSERVER
// Waits for databases to be cleared and for version change transactions to
// complete before dispatching the given runnable.
nsresult WaitForOpenAllowed(const nsACString& aOrigin,
nsIAtom* aId,
nsIRunnable* aRunnable);
void AllowNextSynchronizedOp(const nsACString& aOrigin,
nsIAtom* aId);
nsIThread* IOThread()
{
NS_ASSERTION(mIOThread, "This should never be null!");
return mIOThread;
}
// Returns true if we've begun the shutdown process.
static bool IsShuttingDown();
static bool IsClosed();
typedef void (*WaitingOnDatabasesCallback)(nsTArray<nsRefPtr<IDBDatabase> >&, void*);
// Acquire exclusive access to the database given (waits for all others to
// close). If databases need to close first, the callback will be invoked
// with an array of said databases.
nsresult AcquireExclusiveAccess(IDBDatabase* aDatabase,
AsyncConnectionHelper* aHelper,
WaitingOnDatabasesCallback aCallback,
void* aClosure)
{
NS_ASSERTION(aDatabase, "Need a DB here!");
return AcquireExclusiveAccess(aDatabase->Origin(), aDatabase, aHelper,
aCallback, aClosure);
}
nsresult AcquireExclusiveAccess(const nsACString& aOrigin,
AsyncConnectionHelper* aHelper,
WaitingOnDatabasesCallback aCallback,
void* aClosure)
{
return AcquireExclusiveAccess(aOrigin, nsnull, aHelper, aCallback,
aClosure);
}
// Called when a window is being purged from the bfcache or the user leaves
// a page which isn't going into the bfcache. Forces any live database
// objects to close themselves and aborts any running transactions.
void AbortCloseDatabasesForWindow(nsPIDOMWindow* aWindow);
// Used to check if there are running transactions in a given window.
bool HasOpenTransactions(nsPIDOMWindow* aWindow);
// Set the Window that the current thread is doing operations for.
// The caller is responsible for ensuring that aWindow is held alive.
static inline void
SetCurrentWindow(nsPIDOMWindow* aWindow)
{
IndexedDatabaseManager* mgr = Get();
NS_ASSERTION(mgr, "Must have a manager here!");
return mgr->SetCurrentWindowInternal(aWindow);
}
static PRUint32
GetIndexedDBQuotaMB();
nsresult EnsureOriginIsInitialized(const nsACString& aOrigin,
nsIFile** aDirectory);
// Determine if the quota is lifted for the Window the current thread is
// using.
static inline bool
QuotaIsLifted()
{
IndexedDatabaseManager* mgr = Get();
NS_ASSERTION(mgr, "Must have a manager here!");
return mgr->QuotaIsLiftedInternal();
}
static inline void
CancelPromptsForWindow(nsPIDOMWindow* aWindow)
{
IndexedDatabaseManager* mgr = Get();
NS_ASSERTION(mgr, "Must have a manager here!");
mgr->CancelPromptsForWindowInternal(aWindow);
}
static nsresult
GetASCIIOriginFromWindow(nsPIDOMWindow* aWindow, nsCString& aASCIIOrigin);
already_AddRefed<FileManager>
GetOrCreateFileManager(const nsACString& aOrigin,
const nsAString& aDatabaseName);
already_AddRefed<FileManager>
GetFileManager(const nsACString& aOrigin,
const nsAString& aDatabaseName);
void InvalidateFileManagersForOrigin(const nsACString& aOrigin);
void InvalidateFileManager(const nsACString& aOrigin,
const nsAString& aDatabaseName);
nsresult AsyncDeleteFile(FileManager* aFileManager,
PRInt64 aFileId);
static mozilla::Mutex& FileMutex()
{
IndexedDatabaseManager* mgr = Get();
NS_ASSERTION(mgr, "Must have a manager here!");
return mgr->mFileMutex;
}
private:
IndexedDatabaseManager();
~IndexedDatabaseManager();
nsresult AcquireExclusiveAccess(const nsACString& aOrigin,
IDBDatabase* aDatabase,
AsyncConnectionHelper* aHelper,
WaitingOnDatabasesCallback aCallback,
void* aClosure);
void SetCurrentWindowInternal(nsPIDOMWindow* aWindow);
bool QuotaIsLiftedInternal();
void CancelPromptsForWindowInternal(nsPIDOMWindow* aWindow);
// Called when a database is created.
bool RegisterDatabase(IDBDatabase* aDatabase);
// Called when a database is being unlinked or destroyed.
void UnregisterDatabase(IDBDatabase* aDatabase);
// Called when a database has been closed.
void OnDatabaseClosed(IDBDatabase* aDatabase);
// Responsible for clearing the database files for a particular origin on the
// IO thread. Created when nsIIDBIndexedDatabaseManager::ClearDatabasesForURI
// is called. Runs three times, first on the main thread, next on the IO
// thread, and then finally again on the main thread. While on the IO thread
// the runnable will actually remove the origin's database files and the
// directory that contains them before dispatching itself back to the main
// thread. When back on the main thread the runnable will notify the
// IndexedDatabaseManager that the job has been completed.
class OriginClearRunnable : public nsIRunnable
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
OriginClearRunnable(const nsACString& aOrigin,
nsIThread* aThread)
: mOrigin(aOrigin),
mThread(aThread),
mFirstCallback(true)
{ }
nsCString mOrigin;
nsCOMPtr<nsIThread> mThread;
bool mFirstCallback;
};
bool IsClearOriginPending(const nsACString& origin);
// Responsible for calculating the amount of space taken up by databases of a
// certain origin. Created when nsIIDBIndexedDatabaseManager::GetUsageForURI
// is called. May be canceled with
// nsIIDBIndexedDatabaseManager::CancelGetUsageForURI. Runs twice, first on
// the IO thread, then again on the main thread. While on the IO thread the
// runnable will calculate the size of all files in the origin's directory
// before dispatching itself back to the main thread. When on the main thread
// the runnable will call the callback and then notify the
// IndexedDatabaseManager that the job has been completed.
class AsyncUsageRunnable : public nsIRunnable
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
AsyncUsageRunnable(nsIURI* aURI,
const nsACString& aOrigin,
nsIIndexedDatabaseUsageCallback* aCallback);
// Sets the canceled flag so that the callback is never called.
void Cancel();
// Run calls the RunInternal method and makes sure that we always dispatch
// to the main thread in case of an error.
inline nsresult RunInternal();
nsresult GetUsageForDirectory(nsIFile* aDirectory,
PRUint64* aUsage);
nsCOMPtr<nsIURI> mURI;
nsCString mOrigin;
nsCOMPtr<nsIIndexedDatabaseUsageCallback> mCallback;
PRUint64 mUsage;
PRUint64 mFileUsage;
PRInt32 mCanceled;
};
// Called when AsyncUsageRunnable has finished its Run() method.
inline void OnUsageCheckComplete(AsyncUsageRunnable* aRunnable);
// A struct that contains the information corresponding to a pending or
// running operation that requires synchronization (e.g. opening a db,
// clearing dbs for an origin, etc).
struct SynchronizedOp
{
SynchronizedOp(const nsACString& aOrigin, nsIAtom* aId);
~SynchronizedOp();
// Test whether the second SynchronizedOp needs to get behind this one.
bool MustWaitFor(const SynchronizedOp& aRhs) const;
void DelayRunnable(nsIRunnable* aRunnable);
void DispatchDelayedRunnables();
const nsCString mOrigin;
nsCOMPtr<nsIAtom> mId;
nsRefPtr<AsyncConnectionHelper> mHelper;
nsTArray<nsCOMPtr<nsIRunnable> > mDelayedRunnables;
nsTArray<nsRefPtr<IDBDatabase> > mDatabases;
};
// A callback runnable used by the TransactionPool when it's safe to proceed
// with a SetVersion/DeleteDatabase/etc.
class WaitForTransactionsToFinishRunnable : public nsIRunnable
{
public:
WaitForTransactionsToFinishRunnable(SynchronizedOp* aOp)
: mOp(aOp)
{
NS_ASSERTION(mOp, "Why don't we have a runnable?");
NS_ASSERTION(mOp->mDatabases.IsEmpty(), "We're here too early!");
NS_ASSERTION(mOp->mHelper, "What are we supposed to do when we're done?");
}
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
private:
// The IndexedDatabaseManager holds this alive.
SynchronizedOp* mOp;
};
class AsyncDeleteFileRunnable : public nsIRunnable
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
AsyncDeleteFileRunnable(const nsAString& aFilePath)
: mFilePath(aFilePath)
{ }
private:
nsString mFilePath;
};
static nsresult DispatchHelper(AsyncConnectionHelper* aHelper);
// Maintains a list of live databases per origin.
nsClassHashtable<nsCStringHashKey, nsTArray<IDBDatabase*> > mLiveDatabases;
// TLS storage index for the current thread's window
PRUintn mCurrentWindowIndex;
// Lock protecting mQuotaHelperHash
mozilla::Mutex mQuotaHelperMutex;
// A map of Windows to the corresponding quota helper.
nsRefPtrHashtable<nsPtrHashKey<nsPIDOMWindow>, CheckQuotaHelper> mQuotaHelperHash;
// Maintains a list of all file managers per origin. The list is actually also
// a list of all origins that were successfully initialized. This list
// isn't protected by any mutex but it is only ever touched on the IO thread.
nsClassHashtable<nsCStringHashKey,
nsTArray<nsRefPtr<FileManager> > > mFileManagers;
// Maintains a list of origins that we're currently enumerating to gather
// usage statistics.
nsAutoTArray<nsRefPtr<AsyncUsageRunnable>, 1> mUsageRunnables;
// Maintains a list of synchronized operatons that are in progress or queued.
nsAutoTArray<nsAutoPtr<SynchronizedOp>, 5> mSynchronizedOps;
// Thread on which IO is performed.
nsCOMPtr<nsIThread> mIOThread;
// A timer that gets activated at shutdown to ensure we close all databases.
nsCOMPtr<nsITimer> mShutdownTimer;
// A single threadsafe instance of our quota callback. Created on the main
// thread during GetOrCreate().
nsCOMPtr<mozIStorageQuotaCallback> mQuotaCallbackSingleton;
// Lock protecting FileManager.mFileInfos and nsDOMFileBase.mFileInfos
// It's s also used to atomically update FileInfo.mRefCnt, FileInfo.mDBRefCnt
// and FileInfo.mSliceRefCnt
mozilla::Mutex mFileMutex;
};
class AutoEnterWindow
{
public:
AutoEnterWindow(nsPIDOMWindow* aWindow)
{
IndexedDatabaseManager::SetCurrentWindow(aWindow);
}
~AutoEnterWindow()
{
IndexedDatabaseManager::SetCurrentWindow(nsnull);
}
};
END_INDEXEDDB_NAMESPACE
#endif /* mozilla_dom_indexeddb_indexeddatabasemanager_h__ */