/*

 * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved.

 * Copyright (C) 2009 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 COMPUTER, INC. ``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 COMPUTER, INC. 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"

#if ENABLE(WORKERS)

#include "Worker.h"

#include "DOMWindow.h"

#include "DocLoader.h"

#include "Document.h"

#include "EventException.h"

#include "EventListener.h"

#include "EventNames.h"

#include "ExceptionCode.h"

#include "Frame.h"

#include "FrameLoader.h"

#include "InspectorController.h"

#include "MessageEvent.h"

#include "TextEncoding.h"

#include "WorkerContextProxy.h"

#include "WorkerScriptLoader.h"

#include "WorkerThread.h"

#include <wtf/MainThread.h>

namespace WebCore {

inline Worker::Worker(ScriptExecutionContext* context)

    : AbstractWorker(context)

    , m_contextProxy(WorkerContextProxy::create(this))

{

}

PassRefPtr<Worker> Worker::create(const String& url, ScriptExecutionContext* context, ExceptionCode& ec)

{

    RefPtr<Worker> worker = adoptRef(new Worker(context));

    KURL scriptURL = worker->resolveURL(url, ec);

    if (scriptURL.isEmpty())

        return 0;

    worker->m_scriptLoader = adoptPtr(new WorkerScriptLoader(ResourceRequestBase::TargetIsWorker));

    worker->m_scriptLoader->loadAsynchronously(context, scriptURL, DenyCrossOriginRequests, worker.get());

    // The worker context does not exist while loading, so we must ensure that the worker object is not collected, nor are its event listeners.

    worker->setPendingActivity(worker.get());

#if ENABLE(INSPECTOR)

    if (InspectorController* inspector = context->inspectorController())

        inspector->didCreateWorker(worker->asID(), scriptURL.string(), false);

#endif

    return worker.release();

}

Worker::~Worker()

{

    ASSERT(isMainThread());

    ASSERT(scriptExecutionContext()); // The context is protected by worker context proxy, so it cannot be destroyed while a Worker exists.

    m_contextProxy->workerObjectDestroyed();

}

// FIXME: remove this when we update the ObjC bindings (bug #28774).

void Worker::postMessage(PassRefPtr<SerializedScriptValue> message, MessagePort* port, ExceptionCode& ec)

{

    MessagePortArray ports;

    if (port)

        ports.append(port);

    postMessage(message, &ports, ec);

}

void Worker::postMessage(PassRefPtr<SerializedScriptValue> message, ExceptionCode& ec)

{

    postMessage(message, static_cast<MessagePortArray*>(0), ec);

}

void Worker::postMessage(PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, ExceptionCode& ec)

{

    // Disentangle the port in preparation for sending it to the remote context.

    OwnPtr<MessagePortChannelArray> channels = MessagePort::disentanglePorts(ports, ec);

    if (ec)

        return;

    m_contextProxy->postMessageToWorkerContext(message, channels.release());

}

void Worker::terminate()

{

    m_contextProxy->terminateWorkerContext();

}

bool Worker::canSuspend() const

{

    // FIXME: It is not currently possible to suspend a worker, so pages with workers can not go into page cache.

    return false;

}

void Worker::stop()

{

    terminate();

}

bool Worker::hasPendingActivity() const

{

    return m_contextProxy->hasPendingActivity() || ActiveDOMObject::hasPendingActivity();

}

void Worker::notifyFinished()

{

    if (m_scriptLoader->failed())

        dispatchEvent(Event::create(eventNames().errorEvent, false, true));

    else {

        m_contextProxy->startWorkerContext(m_scriptLoader->url(), scriptExecutionContext()->userAgent(m_scriptLoader->url()), m_scriptLoader->script());

#if ENABLE(INSPECTOR)

        if (InspectorController* inspector = scriptExecutionContext()->inspectorController())

            inspector->scriptImported(m_scriptLoader->identifier(), m_scriptLoader->script());

#endif

    }

    m_scriptLoader = 0;

    unsetPendingActivity(this);

}

} // namespace WebCore

#endif // ENABLE(WORKERS)