gecko/dom/indexedDB/IndexedDatabaseManager.h

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/* -*- 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/IndexedDatabase.h"
#include "mozilla/dom/indexedDB/IDBDatabase.h"
#include "mozilla/dom/indexedDB/IDBRequest.h"
#include "nsIIndexedDatabaseManager.h"
#include "nsIObserver.h"
#include "nsIRunnable.h"
#include "nsIThread.h"
#include "nsIURI.h"
#include "nsClassHashtable.h"
#include "nsHashKeys.h"
#define INDEXEDDB_MANAGER_CONTRACTID "@mozilla.org/dom/indexeddb/manager;1"
class nsITimer;
BEGIN_INDEXEDDB_NAMESPACE
class AsyncConnectionHelper;
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 give runnable.
nsresult WaitForOpenAllowed(const nsAString& aName,
const nsACString& aOrigin,
nsIRunnable* aRunnable);
nsIThread* IOThread()
{
NS_ASSERTION(mIOThread, "This should never be null!");
return mIOThread;
}
// Returns true if we've begun the shutdown process.
static bool IsShuttingDown();
// Begins the process of setting a database version.
nsresult SetDatabaseVersion(IDBDatabase* aDatabase,
IDBVersionChangeRequest* aRequest,
const nsAString& aVersion,
AsyncConnectionHelper* aHelper);
// 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);
private:
IndexedDatabaseManager();
~IndexedDatabaseManager();
// 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);
// Called when a version change transaction can run immediately.
void RunSetVersionTransaction(IDBDatabase* aDatabase)
{
OnDatabaseClosed(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 on the main thread the runnable will dispatch any queued
// runnables and then 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;
nsTArray<nsCOMPtr<nsIRunnable> > mDelayedRunnables;
bool mFirstCallback;
};
// Called when OriginClearRunnable has finished its Run() method.
inline void OnOriginClearComplete(OriginClearRunnable* aRunnable);
// 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();
nsCOMPtr<nsIURI> mURI;
nsCString mOrigin;
nsCOMPtr<nsIIndexedDatabaseUsageCallback> mCallback;
PRUint64 mUsage;
PRInt32 mCanceled;
};
// Called when AsyncUsageRunnable has finished its Run() method.
inline void OnUsageCheckComplete(AsyncUsageRunnable* aRunnable);
// Responsible for waiting until all databases have been closed before running
// the version change transaction. Created when
// IndexedDatabaseManager::SetDatabaseVersion is called. Runs only once on the
// main thread when the version change transaction has completed.
class SetVersionRunnable : public nsIRunnable
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
SetVersionRunnable(IDBDatabase* aDatabase,
nsTArray<nsRefPtr<IDBDatabase> >& aDatabases);
~SetVersionRunnable();
nsRefPtr<IDBDatabase> mRequestingDatabase;
nsTArray<nsRefPtr<IDBDatabase> > mDatabases;
nsRefPtr<AsyncConnectionHelper> mHelper;
nsTArray<nsCOMPtr<nsIRunnable> > mDelayedRunnables;
};
// Called when SetVersionRunnable has finished its Run() method.
inline void OnSetVersionRunnableComplete(SetVersionRunnable* aRunnable);
// Maintains a list of live databases per origin.
nsClassHashtable<nsCStringHashKey, nsTArray<IDBDatabase*> > mLiveDatabases;
// Maintains a list of origins that are currently being cleared.
nsAutoTArray<nsRefPtr<OriginClearRunnable>, 1> mOriginClearRunnables;
// Maintains a list of origins that we're currently enumerating to gather
// usage statistics.
nsAutoTArray<nsRefPtr<AsyncUsageRunnable>, 1> mUsageRunnables;
// Maintains a list of SetVersion calls that are in progress.
nsAutoTArray<nsRefPtr<SetVersionRunnable>, 1> mSetVersionRunnables;
// 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;
};
END_INDEXEDDB_NAMESPACE
#endif /* mozilla_dom_indexeddb_indexeddatabasemanager_h__ */