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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.
*/
#ifndef IDBCallbacks_h
#define IDBCallbacks_h
#include "ActiveDOMObject.h"
#include "IDBDatabaseError.h"
#include "Timer.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#if ENABLE(INDEXED_DATABASE)
namespace WebCore {
// All IndexedDB callbacks must implement this class. It handles the asynchronous firing of
// the callbacks.
template <typename ResultType>
class IDBCallbacks : public RefCounted<IDBCallbacks<ResultType> >, public ActiveDOMObject {
public:
IDBCallbacks(ScriptExecutionContext* scriptExecutionContext, void* upcastPointer)
: ActiveDOMObject(scriptExecutionContext, upcastPointer)
, m_timer(this, &IDBCallbacks::timerFired)
{
}
virtual ~IDBCallbacks() { }
void onSuccess(PassRefPtr<ResultType> result)
{
ASSERT(!m_result);
ASSERT(!m_error);
m_result = result;
ASSERT(m_result);
ASSERT(!m_timer.isActive());
m_selfRef = this;
m_timer.startOneShot(0);
}
void onError(PassRefPtr<IDBDatabaseError> error)
{
ASSERT(!m_result);
ASSERT(!m_error);
m_error = error;
ASSERT(m_error);
ASSERT(!m_timer.isActive());
m_selfRef = this;
m_timer.startOneShot(0);
}
protected:
virtual void onSuccessAsync(PassRefPtr<ResultType>) = 0;
virtual void onErrorAsync(PassRefPtr<IDBDatabaseError>) = 0;
void timerFired(Timer<IDBCallbacks>*)
{
if (m_result) {
onSuccessAsync(m_result);
m_result = 0;
} else {
onErrorAsync(m_error);
m_error = 0;
}
m_selfRef = 0; // May trigger a delete immediately.
}
private:
Timer<IDBCallbacks> m_timer;
RefPtr<IDBCallbacks> m_selfRef;
RefPtr<ResultType> m_result;
RefPtr<IDBDatabaseError> m_error;
};
} // namespace WebCore
#endif
#endif // IDBCallbacks_h
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