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/*
* Copyright (C) 2007, 2008 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 DatabaseTask_h
#define DatabaseTask_h
#if ENABLE(DATABASE)
#include "ExceptionCode.h"
#include "PlatformString.h"
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/PassRefPtr.h>
#include <wtf/Threading.h>
#include <wtf/Vector.h>
namespace WebCore {
class Database;
class DatabaseTask;
class DatabaseThread;
class SQLValue;
class SQLCallback;
class SQLTransaction;
class VersionChangeCallback;
// Can be used to wait until DatabaseTask is completed.
// Has to be passed into DatabaseTask::create to be associated with the task.
class DatabaseTaskSynchronizer : public Noncopyable {
public:
DatabaseTaskSynchronizer();
// Called from main thread to wait until task is completed.
void waitForTaskCompletion();
// Called by the task.
void taskCompleted();
private:
bool m_taskCompleted;
Mutex m_synchronousMutex;
ThreadCondition m_synchronousCondition;
};
class DatabaseTask : public Noncopyable {
friend class Database;
public:
virtual ~DatabaseTask();
void performTask();
Database* database() const { return m_database; }
protected:
DatabaseTask(Database*, DatabaseTaskSynchronizer*);
private:
virtual void doPerformTask() = 0;
Database* m_database;
DatabaseTaskSynchronizer* m_synchronizer;
#ifndef NDEBUG
virtual const char* debugTaskName() const = 0;
bool m_complete;
#endif
};
class DatabaseOpenTask : public DatabaseTask {
public:
static PassOwnPtr<DatabaseOpenTask> create(Database* db, DatabaseTaskSynchronizer* synchronizer, ExceptionCode& code, bool& success)
{
return new DatabaseOpenTask(db, synchronizer, code, success);
}
private:
DatabaseOpenTask(Database*, DatabaseTaskSynchronizer*, ExceptionCode&, bool& success);
virtual void doPerformTask();
#ifndef NDEBUG
virtual const char* debugTaskName() const;
#endif
ExceptionCode& m_code;
bool& m_success;
};
class DatabaseCloseTask : public DatabaseTask {
public:
static PassOwnPtr<DatabaseCloseTask> create(Database* db, DatabaseTaskSynchronizer* synchronizer)
{
return new DatabaseCloseTask(db, synchronizer);
}
private:
DatabaseCloseTask(Database*, DatabaseTaskSynchronizer*);
virtual void doPerformTask();
#ifndef NDEBUG
virtual const char* debugTaskName() const;
#endif
};
class DatabaseTransactionTask : public DatabaseTask {
public:
// Transaction task is never synchronous, so no 'synchronizer' parameter.
static PassOwnPtr<DatabaseTransactionTask> create(PassRefPtr<SQLTransaction> transaction)
{
return new DatabaseTransactionTask(transaction);
}
SQLTransaction* transaction() const { return m_transaction.get(); }
virtual ~DatabaseTransactionTask();
private:
DatabaseTransactionTask(PassRefPtr<SQLTransaction>);
virtual void doPerformTask();
#ifndef NDEBUG
virtual const char* debugTaskName() const;
#endif
RefPtr<SQLTransaction> m_transaction;
};
class DatabaseTableNamesTask : public DatabaseTask {
public:
static PassOwnPtr<DatabaseTableNamesTask> create(Database* db, DatabaseTaskSynchronizer* synchronizer, Vector<String>& names)
{
return new DatabaseTableNamesTask(db, synchronizer, names);
}
private:
DatabaseTableNamesTask(Database*, DatabaseTaskSynchronizer*, Vector<String>& names);
virtual void doPerformTask();
#ifndef NDEBUG
virtual const char* debugTaskName() const;
#endif
Vector<String>& m_tableNames;
};
} // namespace WebCore
#endif // ENABLE(DATABASE)
#endif // DatabaseTask_h
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