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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.
* 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.
*/
#include "config.h"
#include "IDBRequest.h"
#if ENABLE(INDEXED_DATABASE)
#include "Event.h"
#include "EventException.h"
#include "EventListener.h"
#include "EventNames.h"
#include "IDBCursor.h"
#include "IDBDatabase.h"
#include "IDBIndex.h"
#include "IDBErrorEvent.h"
#include "IDBObjectStore.h"
#include "IDBPendingTransactionMonitor.h"
#include "IDBSuccessEvent.h"
#include "ScriptExecutionContext.h"
namespace WebCore {
IDBRequest::IDBRequest(ScriptExecutionContext* context, PassRefPtr<IDBAny> source, IDBTransactionBackendInterface* transaction)
: ActiveDOMObject(context, this)
, m_source(source)
, m_transaction(transaction)
, m_timer(this, &IDBRequest::timerFired)
, m_readyState(LOADING)
{
if (m_transaction)
IDBPendingTransactionMonitor::removePendingTransaction(m_transaction.get());
}
IDBRequest::~IDBRequest()
{
// The transaction pointer is used to notify the transaction once the JS events were
// dispatched by this request object. If no new tasks were added by the event JS callbacks,
// the transaction can commit. Otherwise, it can continue executing the new tasks.
// It is important to guarantee that the transaction is notified after the events are
// dispatched, as the transaction cannot commit or execute new tasks in the absence
// of these notifications. We clear the transaction pointer once the events have dispatched,
// so having a non-zero pointer at IDBRequest destruction time shows that the events have not
// yet fired and there is a transaction waiting to be notified. This is an error.
ASSERT(!m_transaction);
}
bool IDBRequest::resetReadyState(IDBTransactionBackendInterface* transaction)
{
ASSERT(m_readyState == DONE);
m_readyState = LOADING;
ASSERT(!m_transaction);
m_transaction = transaction;
IDBPendingTransactionMonitor::removePendingTransaction(m_transaction.get());
return true;
}
void IDBRequest::onError(PassRefPtr<IDBDatabaseError> error)
{
scheduleEvent(0, error);
}
void IDBRequest::onSuccess()
{
scheduleEvent(IDBAny::createNull(), 0);
}
void IDBRequest::onSuccess(PassRefPtr<IDBCursorBackendInterface> backend)
{
scheduleEvent(IDBAny::create(IDBCursor::create(backend, this, m_transaction.get())), 0);
}
void IDBRequest::onSuccess(PassRefPtr<IDBDatabaseBackendInterface> backend)
{
scheduleEvent(IDBAny::create(IDBDatabase::create(backend)), 0);
}
void IDBRequest::onSuccess(PassRefPtr<IDBIndexBackendInterface> backend)
{
scheduleEvent(IDBAny::create(IDBIndex::create(backend, m_transaction.get())), 0);
}
void IDBRequest::onSuccess(PassRefPtr<IDBKey> idbKey)
{
scheduleEvent(IDBAny::create(idbKey), 0);
}
void IDBRequest::onSuccess(PassRefPtr<IDBObjectStoreBackendInterface> backend)
{
// FIXME: This function should go away once createObjectStore is sync.
scheduleEvent(IDBAny::create(IDBObjectStore::create(backend, m_transaction.get())), 0);
}
void IDBRequest::onSuccess(PassRefPtr<IDBTransactionBackendInterface> prpBackend)
{
RefPtr<IDBTransactionBackendInterface> backend = prpBackend;
// This is only used by setVersion which will always have a source that's an IDBDatabase.
m_source->idbDatabase()->setSetVersionTransaction(backend.get());
RefPtr<IDBTransaction> frontend = IDBTransaction::create(scriptExecutionContext(), backend, m_source->idbDatabase().get());
backend->setCallbacks(frontend.get());
m_transaction = backend;
IDBPendingTransactionMonitor::removePendingTransaction(m_transaction.get());
scheduleEvent(IDBAny::create(frontend.release()), 0);
}
void IDBRequest::onSuccess(PassRefPtr<SerializedScriptValue> serializedScriptValue)
{
scheduleEvent(IDBAny::create(serializedScriptValue), 0);
}
ScriptExecutionContext* IDBRequest::scriptExecutionContext() const
{
return ActiveDOMObject::scriptExecutionContext();
}
bool IDBRequest::canSuspend() const
{
// IDBTransactions cannot be suspended at the moment. We therefore
// disallow the back/forward cache for pages that use IndexedDatabase.
return false;
}
EventTargetData* IDBRequest::eventTargetData()
{
return &m_eventTargetData;
}
EventTargetData* IDBRequest::ensureEventTargetData()
{
return &m_eventTargetData;
}
void IDBRequest::timerFired(Timer<IDBRequest>*)
{
ASSERT(m_selfRef);
ASSERT(m_pendingEvents.size());
// We need to keep self-referencing ourself, otherwise it's possible we'll be deleted.
// But in some cases, suspend() could be called while we're dispatching an event, so we
// need to make sure that resume() doesn't re-start the timer based on m_selfRef being set.
RefPtr<IDBRequest> selfRef = m_selfRef.release();
// readyStateReset can be called synchronously while we're dispatching the event.
RefPtr<IDBTransactionBackendInterface> transaction = m_transaction;
m_transaction.clear();
Vector<PendingEvent> pendingEvents;
pendingEvents.swap(m_pendingEvents);
for (size_t i = 0; i < pendingEvents.size(); ++i) {
if (pendingEvents[i].m_error) {
ASSERT(!pendingEvents[i].m_result);
dispatchEvent(IDBErrorEvent::create(m_source, *pendingEvents[i].m_error));
} else {
ASSERT(pendingEvents[i].m_result->type() != IDBAny::UndefinedType);
dispatchEvent(IDBSuccessEvent::create(m_source, pendingEvents[i].m_result));
}
}
if (transaction) {
// Now that we processed all pending events, let the transaction monitor check if
// it can commit the current transaction or if there's anything new pending.
// FIXME: Handle the workers case.
transaction->didCompleteTaskEvents();
}
}
void IDBRequest::scheduleEvent(PassRefPtr<IDBAny> result, PassRefPtr<IDBDatabaseError> error)
{
ASSERT(m_readyState < DONE);
ASSERT(!!m_selfRef == m_timer.isActive());
PendingEvent pendingEvent;
pendingEvent.m_result = result;
pendingEvent.m_error = error;
m_pendingEvents.append(pendingEvent);
m_readyState = DONE;
if (!m_timer.isActive()) {
m_selfRef = this;
m_timer.startOneShot(0);
}
}
} // namespace WebCore
#endif
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