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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 THIRD_PARTY_BLINK_RENDERER_MODULES_WEBDATABASE_SQL_TRANSACTION_BACKEND_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBDATABASE_SQL_TRANSACTION_BACKEND_H_
#include <memory>
#include "third_party/blink/renderer/modules/webdatabase/database_basic_types.h"
#include "third_party/blink/renderer/modules/webdatabase/sql_statement.h"
#include "third_party/blink/renderer/modules/webdatabase/sql_statement_backend.h"
#include "third_party/blink/renderer/modules/webdatabase/sql_transaction_state_machine.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/deque.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/threading_primitives.h"
namespace blink {
class Database;
class SQLErrorData;
class SQLiteTransaction;
class SQLTransaction;
class SQLTransactionBackend;
class SQLValue;
class SQLTransactionWrapper : public GarbageCollected<SQLTransactionWrapper> {
public:
virtual ~SQLTransactionWrapper() = default;
virtual void Trace(blink::Visitor* 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 GarbageCollected<SQLTransactionBackend>,
public SQLTransactionStateMachine<SQLTransactionBackend> {
public:
SQLTransactionBackend(Database*,
SQLTransaction*,
SQLTransactionWrapper*,
bool read_only);
~SQLTransactionBackend() override;
void Trace(blink::Visitor*);
void LockAcquired();
void PerformNextStep();
Database* GetDatabase() { return database_.Get(); }
bool IsReadOnly() { return read_only_; }
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:
void DoCleanup();
void EnqueueStatementBackend(SQLStatementBackend*);
// State Machine functions:
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();
CrossThreadPersistent<SQLTransaction> frontend_;
CrossThreadPersistent<SQLStatementBackend> current_statement_backend_;
CrossThreadPersistent<Database> database_;
Member<SQLTransactionWrapper> wrapper_;
std::unique_ptr<SQLErrorData> transaction_error_;
bool has_callback_;
bool has_success_callback_;
bool has_error_callback_;
bool should_retry_current_statement_;
bool modified_database_;
bool lock_acquired_;
bool read_only_;
bool has_version_mismatch_;
Mutex statement_mutex_;
Deque<CrossThreadPersistent<SQLStatementBackend>> statement_queue_;
std::unique_ptr<SQLiteTransaction> sqlite_transaction_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBDATABASE_SQL_TRANSACTION_BACKEND_H_
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