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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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 "ActiveDOMCallback.h"
#include "ActiveDOMObject.h"
#include "ScriptExecutionContext.h"
#include <wtf/PassOwnPtr.h>
#include <wtf/ThreadingPrimitives.h>
namespace WebCore {
static void destroyOnContextThread(PassOwnPtr<ActiveDOMObjectCallbackImpl>);
class DestroyOnContextThreadTask : public ScriptExecutionContext::Task {
public:
static PassOwnPtr<DestroyOnContextThreadTask> create(PassOwnPtr<ActiveDOMObjectCallbackImpl> impl)
{
return adoptPtr(new DestroyOnContextThreadTask(impl));
}
virtual void performTask(ScriptExecutionContext*)
{
destroyOnContextThread(m_impl.release());
}
private:
DestroyOnContextThreadTask(PassOwnPtr<ActiveDOMObjectCallbackImpl> impl)
: m_impl(impl)
{
}
OwnPtr<ActiveDOMObjectCallbackImpl> m_impl;
};
class ActiveDOMObjectCallbackImpl : public ActiveDOMObject {
public:
ActiveDOMObjectCallbackImpl(ScriptExecutionContext* context)
: ActiveDOMObject(context, this)
, m_suspended(false)
, m_stopped(false)
{
}
virtual void contextDestroyed()
{
MutexLocker locker(m_mutex);
ActiveDOMObject::contextDestroyed();
}
virtual bool canSuspend() const { return false; }
virtual void suspend(ReasonForSuspension)
{
MutexLocker locker(m_mutex);
m_suspended = true;
}
virtual void resume()
{
MutexLocker locker(m_mutex);
m_suspended = false;
}
virtual void stop()
{
MutexLocker locker(m_mutex);
m_stopped = true;
}
bool canInvokeCallback()
{
MutexLocker locker(m_mutex);
return (!m_suspended && !m_stopped);
}
ScriptExecutionContext* scriptExecutionContext()
{
MutexLocker locker(m_mutex);
return ActiveDOMObject::scriptExecutionContext();
}
Mutex& mutex() { return m_mutex; }
private:
Mutex m_mutex;
bool m_suspended;
bool m_stopped;
};
static void destroyOnContextThread(PassOwnPtr<ActiveDOMObjectCallbackImpl> impl)
{
OwnPtr<ActiveDOMObjectCallbackImpl> implOwnPtr = impl;
ScriptExecutionContext* context = implOwnPtr->scriptExecutionContext();
MutexLocker locker(implOwnPtr->mutex());
if (context && !context->isContextThread())
context->postTask(DestroyOnContextThreadTask::create(implOwnPtr.release()));
}
ActiveDOMCallback::ActiveDOMCallback(ScriptExecutionContext* context)
: m_impl(new ActiveDOMObjectCallbackImpl(context))
{
}
ActiveDOMCallback::~ActiveDOMCallback()
{
destroyOnContextThread(m_impl.release());
}
bool ActiveDOMCallback::canInvokeCallback() const
{
return m_impl->canInvokeCallback();
}
ScriptExecutionContext* ActiveDOMCallback::scriptExecutionContext() const
{
return m_impl->scriptExecutionContext();
}
} // namespace WebCore
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