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/*
* Copyright (C) 2007, 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 SQLTransactionBackend_h
#define SQLTransactionBackend_h
#include "modules/webdatabase/AbstractSQLStatement.h"
#include "modules/webdatabase/AbstractSQLTransactionBackend.h"
#include "modules/webdatabase/DatabaseBasicTypes.h"
#include "modules/webdatabase/SQLTransactionStateMachine.h"
#include "wtf/Deque.h"
#include "wtf/Forward.h"
#include "wtf/ThreadingPrimitives.h"
#include "wtf/text/WTFString.h"
namespace WebCore {
class AbstractSQLTransaction;
class DatabaseBackend;
class SQLError;
class SQLiteTransaction;
class SQLStatementBackend;
class SQLTransactionBackend;
class SQLValue;
class SQLTransactionWrapper : public ThreadSafeRefCounted<SQLTransactionWrapper> {
public:
virtual ~SQLTransactionWrapper() { }
virtual bool performPreflight(SQLTransactionBackend*) = 0;
virtual bool performPostflight(SQLTransactionBackend*) = 0;
virtual SQLError* sqlError() const = 0;
virtual void handleCommitFailedAfterPostflight(SQLTransactionBackend*) = 0;
};
class SQLTransactionBackend : public SQLTransactionStateMachine<SQLTransactionBackend>, public AbstractSQLTransactionBackend {
public:
static PassRefPtr<SQLTransactionBackend> create(DatabaseBackend*,
PassRefPtr<AbstractSQLTransaction>, PassRefPtr<SQLTransactionWrapper>, bool readOnly);
virtual ~SQLTransactionBackend();
void lockAcquired();
void performNextStep();
DatabaseBackend* database() { return m_database.get(); }
bool isReadOnly() { return m_readOnly; }
void notifyDatabaseThreadIsShuttingDown();
private:
SQLTransactionBackend(DatabaseBackend*, PassRefPtr<AbstractSQLTransaction>,
PassRefPtr<SQLTransactionWrapper>, bool readOnly);
// APIs called from the frontend published via AbstractSQLTransactionBackend:
virtual void requestTransitToState(SQLTransactionState) OVERRIDE;
virtual PassRefPtr<SQLError> transactionError() OVERRIDE;
virtual AbstractSQLStatement* currentStatement() OVERRIDE;
virtual void setShouldRetryCurrentStatement(bool) OVERRIDE;
virtual void executeSQL(PassOwnPtr<AbstractSQLStatement>, const String& statement,
const Vector<SQLValue>& arguments, int permissions) OVERRIDE;
void doCleanup();
void enqueueStatementBackend(PassRefPtr<SQLStatementBackend>);
// State Machine functions:
virtual StateFunction stateFunctionFor(SQLTransactionState) OVERRIDE;
void computeNextStateAndCleanupIfNeeded();
// State functions:
SQLTransactionState acquireLock();
SQLTransactionState openTransactionAndPreflight();
SQLTransactionState runStatements();
SQLTransactionState postflightAndCommit();
SQLTransactionState cleanupAndTerminate();
SQLTransactionState cleanupAfterTransactionErrorCallback();
SQLTransactionState unreachableState();
SQLTransactionState sendToFrontendState();
SQLTransactionState nextStateForCurrentStatementError();
SQLTransactionState nextStateForTransactionError();
SQLTransactionState runCurrentStatementAndGetNextState();
void getNextStatement();
RefPtr<AbstractSQLTransaction> m_frontend; // Has a reference cycle, and will break in doCleanup().
RefPtr<SQLStatementBackend> m_currentStatementBackend;
RefPtr<DatabaseBackend> m_database;
RefPtr<SQLTransactionWrapper> m_wrapper;
RefPtr<SQLError> m_transactionError;
bool m_hasCallback;
bool m_hasSuccessCallback;
bool m_hasErrorCallback;
bool m_shouldRetryCurrentStatement;
bool m_modifiedDatabase;
bool m_lockAcquired;
bool m_readOnly;
bool m_hasVersionMismatch;
Mutex m_statementMutex;
Deque<RefPtr<SQLStatementBackend> > m_statementQueue;
OwnPtr<SQLiteTransaction> m_sqliteTransaction;
};
} // namespace WebCore
#endif // SQLTransactionBackend_h
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