/*

 * 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:

 *

 *     * 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 "WebWorkerImpl.h"

#include "CrossThreadTask.h"

#include "DedicatedWorkerContext.h"

#include "DedicatedWorkerThread.h"

#include "KURL.h"

#include "MessageEvent.h"

#include "MessagePort.h"

#include "MessagePortChannel.h"

#include "ScriptExecutionContext.h"

#include "SecurityOrigin.h"

#include "SerializedScriptValue.h"

#include "SubstituteData.h"

#include <wtf/Threading.h>

#include "PlatformMessagePortChannel.h"

#include "WebMessagePortChannel.h"

#include "WebString.h"

#include "WebURL.h"

#include "WebWorkerClient.h"

using namespace WebCore;

namespace WebKit {

#if ENABLE(WORKERS)

WebWorker* WebWorker::create(WebWorkerClient* client)

{

    return new WebWorkerImpl(client);

}

WebWorkerImpl::WebWorkerImpl(WebWorkerClient* client)

    : m_client(client)

{

}

WebWorkerImpl::~WebWorkerImpl()

{

}

WebCommonWorkerClient* WebWorkerImpl::commonClient()

{

    return m_client;

}

void WebWorkerImpl::postMessageToWorkerContextTask(WebCore::ScriptExecutionContext* context,

                                                   WebWorkerImpl* thisPtr,

                                                   const String& message,

                                                   PassOwnPtr<MessagePortChannelArray> channels)

{

    ASSERT(context->isWorkerContext());

    DedicatedWorkerContext* workerContext =

        static_cast<DedicatedWorkerContext*>(context);

    OwnPtr<MessagePortArray> ports =

        MessagePort::entanglePorts(*context, channels);

    RefPtr<SerializedScriptValue> serializedMessage =

        SerializedScriptValue::createFromWire(message);

    workerContext->dispatchEvent(MessageEvent::create(

        ports.release(), serializedMessage.release()));

    thisPtr->confirmMessageFromWorkerObject(workerContext->hasPendingActivity());

}

// WebWorker -------------------------------------------------------------------

void WebWorkerImpl::startWorkerContext(const WebURL& scriptUrl,

                                       const WebString& userAgent,

                                       const WebString& sourceCode)

{

    initializeLoader(scriptUrl);

    setWorkerThread(DedicatedWorkerThread::create(scriptUrl, userAgent,

                                                  sourceCode, *this, *this));

    // Worker initialization means a pending activity.

    reportPendingActivity(true);

    workerThread()->start();

}

void WebWorkerImpl::terminateWorkerContext()

{

    stopWorkerThread();

}

void WebWorkerImpl::postMessageToWorkerContext(const WebString& message,

                                               const WebMessagePortChannelArray& webChannels)

{

    OwnPtr<MessagePortChannelArray> channels;

    if (webChannels.size()) {

        channels = new MessagePortChannelArray(webChannels.size());

        for (size_t i = 0; i < webChannels.size(); ++i) {

            RefPtr<PlatformMessagePortChannel> platform_channel =

                PlatformMessagePortChannel::create(webChannels[i]);

            webChannels[i]->setClient(platform_channel.get());

            (*channels)[i] = MessagePortChannel::create(platform_channel);

        }

    }

    workerThread()->runLoop().postTask(

        createCallbackTask(&postMessageToWorkerContextTask,

                           this, String(message), channels.release()));

}

void WebWorkerImpl::workerObjectDestroyed()

{

    // Worker object in the renderer was destroyed, perhaps a result of GC.

    // For us, it's a signal to start terminating the WorkerContext too.

    // FIXME: when 'kill a worker' html5 spec algorithm is implemented, it

    // should be used here instead of 'terminate a worker'.

    terminateWorkerContext();

}

void WebWorkerImpl::clientDestroyed()

{

    m_client = 0;

}

#else

WebWorker* WebWorker::create(WebWorkerClient* client)

{

    return 0;

}

#endif // ENABLE(WORKERS)

} // namespace WebKit