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/*
* Copyright (C) 2007, 2013, 2015 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 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 "DatabaseBasicTypes.h"
#include "SQLTransactionStateMachine.h"
#include <memory>
#include <wtf/Deque.h>
#include <wtf/Forward.h>
#include <wtf/Lock.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class Database;
class OriginLock;
class SQLError;
class SQLiteTransaction;
class SQLStatement;
class SQLTransaction;
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 ThreadSafeRefCounted<SQLTransactionBackend>, public SQLTransactionStateMachine<SQLTransactionBackend> {
public:
static Ref<SQLTransactionBackend> create(Database*, PassRefPtr<SQLTransaction>, PassRefPtr<SQLTransactionWrapper>, bool readOnly);
virtual ~SQLTransactionBackend();
void lockAcquired();
void performNextStep();
Database* database() { return m_database.get(); }
bool isReadOnly() { return m_readOnly; }
void notifyDatabaseThreadIsShuttingDown();
// APIs called from the frontend published via SQLTransactionBackend:
void requestTransitToState(SQLTransactionState);
PassRefPtr<SQLError> transactionError();
SQLStatement* currentStatement();
void setShouldRetryCurrentStatement(bool);
void executeSQL(std::unique_ptr<SQLStatement>);
private:
SQLTransactionBackend(Database*, PassRefPtr<SQLTransaction>, PassRefPtr<SQLTransactionWrapper>, bool readOnly);
void doCleanup();
void enqueueStatementBackend(std::unique_ptr<SQLStatement>);
// State Machine functions:
virtual StateFunction stateFunctionFor(SQLTransactionState) override;
void computeNextStateAndCleanupIfNeeded();
// State functions:
void acquireLock();
void openTransactionAndPreflight();
void runStatements();
void cleanupAndTerminate();
void cleanupAfterTransactionErrorCallback();
NO_RETURN_DUE_TO_ASSERT void unreachableState();
void getNextStatement();
bool runCurrentStatement();
void handleCurrentStatementError();
void handleTransactionError();
void postflightAndCommit();
void acquireOriginLock();
void releaseOriginLockIfNeeded();
RefPtr<SQLTransaction> m_frontend; // Has a reference cycle, and will break in doCleanup().
std::unique_ptr<SQLStatement> m_currentStatementBackend;
RefPtr<Database> 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;
Lock m_statementMutex;
Deque<std::unique_ptr<SQLStatement>> m_statementQueue;
std::unique_ptr<SQLiteTransaction> m_sqliteTransaction;
RefPtr<OriginLock> m_originLock;
};
} // namespace WebCore
#endif // SQLTransactionBackend_h
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