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/*
* Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef DatabaseTracker_h
#define DatabaseTracker_h
#include "modules/ModulesExport.h"
#include "modules/webdatabase/DatabaseError.h"
#include "platform/heap/Handle.h"
#include "wtf/Functional.h"
#include "wtf/HashMap.h"
#include "wtf/HashSet.h"
#include "wtf/ThreadingPrimitives.h"
#include "wtf/text/StringHash.h"
#include "wtf/text/WTFString.h"
#include <memory>
namespace blink {
class Database;
class DatabaseContext;
class Page;
class SecurityOrigin;
class MODULES_EXPORT DatabaseTracker {
WTF_MAKE_NONCOPYABLE(DatabaseTracker);
USING_FAST_MALLOC(DatabaseTracker);
public:
static DatabaseTracker& tracker();
// This singleton will potentially be used from multiple worker threads and
// the page's context thread simultaneously. To keep this safe, it's
// currently using 4 locks. In order to avoid deadlock when taking multiple
// locks, you must take them in the correct order:
// m_databaseGuard before quotaManager if both locks are needed.
// m_openDatabaseMapGuard before quotaManager if both locks are needed.
// m_databaseGuard and m_openDatabaseMapGuard currently don't overlap.
// notificationMutex() is currently independent of the other locks.
bool canEstablishDatabase(DatabaseContext*,
const String& name,
const String& displayName,
unsigned estimatedSize,
DatabaseError&);
String fullPathForDatabase(SecurityOrigin*,
const String& name,
bool createIfDoesNotExist = true);
void addOpenDatabase(Database*);
void removeOpenDatabase(Database*);
unsigned long long getMaxSizeForDatabase(const Database*);
void closeDatabasesImmediately(SecurityOrigin*, const String& name);
using DatabaseCallback = Function<void(Database*)>;
void forEachOpenDatabaseInPage(Page*, std::unique_ptr<DatabaseCallback>);
void prepareToOpenDatabase(Database*);
void failedToOpenDatabase(Database*);
private:
using DatabaseSet = HashSet<CrossThreadPersistent<Database>>;
using DatabaseNameMap = HashMap<String, DatabaseSet*>;
using DatabaseOriginMap = HashMap<String, DatabaseNameMap*>;
DatabaseTracker();
void closeOneDatabaseImmediately(const String& originIdentifier,
const String& name,
Database*);
Mutex m_openDatabaseMapGuard;
mutable std::unique_ptr<DatabaseOriginMap> m_openDatabaseMap;
};
} // namespace blink
#endif // DatabaseTracker_h
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