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/*
* Copyright (C) 2010 Google 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.
*
* 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.
*/
#include "config.h"
#include "IDBTransactionBackendImpl.h"
#if ENABLE(INDEXED_DATABASE)
#include "IDBBackingStore.h"
#include "IDBDatabaseBackendImpl.h"
#include "IDBDatabaseException.h"
#include "IDBTransactionCoordinator.h"
namespace WebCore {
PassRefPtr<IDBTransactionBackendImpl> IDBTransactionBackendImpl::create(DOMStringList* objectStores, unsigned short mode, IDBDatabaseBackendImpl* database)
{
return adoptRef(new IDBTransactionBackendImpl(objectStores, mode, database));
}
IDBTransactionBackendImpl::IDBTransactionBackendImpl(DOMStringList* objectStores, unsigned short mode, IDBDatabaseBackendImpl* database)
: m_objectStoreNames(objectStores)
, m_mode(mode)
, m_state(Unused)
, m_database(database)
, m_transaction(database->backingStore()->createTransaction())
, m_taskTimer(this, &IDBTransactionBackendImpl::taskTimerFired)
, m_taskEventTimer(this, &IDBTransactionBackendImpl::taskEventTimerFired)
, m_pendingEvents(0)
{
ASSERT(m_objectStoreNames);
m_database->transactionCoordinator()->didCreateTransaction(this);
}
IDBTransactionBackendImpl::~IDBTransactionBackendImpl()
{
// It shouldn't be possible for this object to get deleted until it's either complete or aborted.
ASSERT(m_state == Finished);
}
PassRefPtr<IDBObjectStoreBackendInterface> IDBTransactionBackendImpl::objectStore(const String& name, ExceptionCode& ec)
{
if (m_state == Finished) {
ec = IDBDatabaseException::NOT_ALLOWED_ERR;
return 0;
}
// Does a linear search, but it really shouldn't be that slow in practice.
if (!m_objectStoreNames->isEmpty() && !m_objectStoreNames->contains(name)) {
ec = IDBDatabaseException::NOT_FOUND_ERR;
return 0;
}
RefPtr<IDBObjectStoreBackendInterface> objectStore = m_database->objectStore(name);
// FIXME: This is only necessary right now beacuse a setVersion transaction could modify things
// between its creation (where another check occurs) and the .objectStore call.
// There's a bug to make this impossible in the spec. When we make it impossible here, we
// can remove this check.
if (!objectStore) {
ec = IDBDatabaseException::NOT_FOUND_ERR;
return 0;
}
return objectStore.release();
}
bool IDBTransactionBackendImpl::scheduleTask(PassOwnPtr<ScriptExecutionContext::Task> task, PassOwnPtr<ScriptExecutionContext::Task> abortTask)
{
if (m_state == Finished)
return false;
m_taskQueue.append(task);
if (abortTask)
m_abortTaskQueue.prepend(abortTask);
if (m_state == Unused)
start();
return true;
}
void IDBTransactionBackendImpl::abort()
{
if (m_state == Finished)
return;
// The last reference to this object may be released while performing the
// abort steps below. We therefore take a self reference to keep ourselves
// alive while executing this method.
RefPtr<IDBTransactionBackendImpl> self(this);
m_state = Finished;
m_taskTimer.stop();
m_taskEventTimer.stop();
m_transaction->rollback();
// Run the abort tasks, if any.
while (!m_abortTaskQueue.isEmpty()) {
OwnPtr<ScriptExecutionContext::Task> task(m_abortTaskQueue.first().release());
m_abortTaskQueue.removeFirst();
task->performTask(0);
}
m_callbacks->onAbort();
m_database->transactionCoordinator()->didFinishTransaction(this);
ASSERT(!m_database->transactionCoordinator()->isActive(this));
m_database = 0;
}
void IDBTransactionBackendImpl::didCompleteTaskEvents()
{
if (m_state == Finished)
return;
ASSERT(m_state == Running);
ASSERT(m_pendingEvents);
m_pendingEvents--;
if (!m_taskEventTimer.isActive())
m_taskEventTimer.startOneShot(0);
}
void IDBTransactionBackendImpl::run()
{
ASSERT(m_state == StartPending || m_state == Running);
ASSERT(!m_taskTimer.isActive());
m_taskTimer.startOneShot(0);
}
void IDBTransactionBackendImpl::start()
{
ASSERT(m_state == Unused);
m_state = StartPending;
m_database->transactionCoordinator()->didStartTransaction(this);
}
void IDBTransactionBackendImpl::commit()
{
// The last reference to this object may be released while performing the
// commit steps below. We therefore take a self reference to keep ourselves
// alive while executing this method.
RefPtr<IDBTransactionBackendImpl> self(this);
ASSERT(m_state == Running);
m_state = Finished;
m_transaction->commit();
m_callbacks->onComplete();
m_database->transactionCoordinator()->didFinishTransaction(this);
m_database = 0;
}
void IDBTransactionBackendImpl::taskTimerFired(Timer<IDBTransactionBackendImpl>*)
{
ASSERT(!m_taskQueue.isEmpty());
if (m_state == StartPending) {
m_transaction->begin();
m_state = Running;
}
TaskQueue queue;
queue.swap(m_taskQueue);
while (!queue.isEmpty() && m_state != Finished) {
ASSERT(m_state == Running);
OwnPtr<ScriptExecutionContext::Task> task(queue.first().release());
queue.removeFirst();
m_pendingEvents++;
task->performTask(0);
}
}
void IDBTransactionBackendImpl::taskEventTimerFired(Timer<IDBTransactionBackendImpl>*)
{
ASSERT(m_state == Running);
if (!m_pendingEvents && m_taskQueue.isEmpty()) {
// The last task event has completed and the task
// queue is empty. Commit the transaction.
commit();
return;
}
// We are still waiting for other events to complete. However,
// the task queue is non-empty and the timer is inactive.
// We can therfore schedule the timer again.
if (!m_taskQueue.isEmpty() && !m_taskTimer.isActive())
m_taskTimer.startOneShot(0);
}
};
#endif // ENABLE(INDEXED_DATABASE)
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