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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/DatabaseBasicTypes.h"
#include "modules/webdatabase/SQLStatement.h"
#include "modules/webdatabase/SQLTransactionStateMachine.h"
#include "platform/heap/Handle.h"
#include "wtf/Deque.h"
#include "wtf/Forward.h"
#include "wtf/ThreadingPrimitives.h"
namespace blink {
class Database;
class SQLErrorData;
class SQLiteTransaction;
class SQLStatementBackend;
class SQLTransaction;
class SQLTransactionBackend;
class SQLValue;
class SQLTransactionWrapper : public GarbageCollectedFinalized<SQLTransactionWrapper> {
public:
virtual ~SQLTransactionWrapper() { }
virtual void trace(Visitor*) { }
virtual bool performPreflight(SQLTransactionBackend*) = 0;
virtual bool performPostflight(SQLTransactionBackend*) = 0;
virtual SQLErrorData* sqlError() const = 0;
virtual void handleCommitFailedAfterPostflight(SQLTransactionBackend*) = 0;
};
class SQLTransactionBackend final : public GarbageCollectedFinalized<SQLTransactionBackend>, public SQLTransactionStateMachine<SQLTransactionBackend> {
public:
static SQLTransactionBackend* create(Database*, SQLTransaction*, SQLTransactionWrapper*, bool readOnly);
virtual ~SQLTransactionBackend();
void trace(Visitor*);
void lockAcquired();
void performNextStep();
Database* database() { return m_database.get(); }
bool isReadOnly() { return m_readOnly; }
void notifyDatabaseThreadIsShuttingDown();
// APIs called from the frontend published:
void requestTransitToState(SQLTransactionState);
SQLErrorData* transactionError();
SQLStatement* currentStatement();
void setShouldRetryCurrentStatement(bool);
void executeSQL(SQLStatement*, const String& statement, const Vector<SQLValue>& arguments, int permissions);
private:
SQLTransactionBackend(Database*, SQLTransaction*, SQLTransactionWrapper*, bool readOnly);
void doCleanup();
void enqueueStatementBackend(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();
Member<SQLTransaction> m_frontend;
Member<SQLStatementBackend> m_currentStatementBackend;
Member<Database> m_database;
Member<SQLTransactionWrapper> m_wrapper;
OwnPtr<SQLErrorData> 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;
HeapDeque<Member<SQLStatementBackend> > m_statementQueue;
OwnPtr<SQLiteTransaction> m_sqliteTransaction;
};
} // namespace blink
#endif // SQLTransactionBackend_h
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