Source/web/WorkerAllowMainThreadBridgeBase.cpp

/*
 * Copyright (C) 2010, 2013 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *
 *     * 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.
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 * 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
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#include "config.h"
#include "WorkerAllowMainThreadBridgeBase.h"

#include "wtf/MainThread.h"

namespace {

// Observes the worker context and notifies the bridge. This is kept
// separate from the bridge so that it's destroyed correctly by ~Observer.
class WorkerGlobalScopeObserver : public WebCore::WorkerGlobalScope::Observer {
public:
    static PassOwnPtr<WorkerGlobalScopeObserver> create(WebCore::WorkerGlobalScope* context, PassRefPtr<WebKit::WorkerAllowMainThreadBridgeBase> bridge)
    {
        return adoptPtr(new WorkerGlobalScopeObserver(context, bridge));
    }

    // WorkerGlobalScope::Observer method.
    virtual void notifyStop()
    {
        if (!m_bridge)
            return;
        m_bridge->cancel();
    }

private:
    WorkerGlobalScopeObserver(WebCore::WorkerGlobalScope* context, PassRefPtr<WebKit::WorkerAllowMainThreadBridgeBase> bridge)
        : WebCore::WorkerGlobalScope::Observer(context)
        , m_bridge(bridge)
    {
    }

    RefPtr<WebKit::WorkerAllowMainThreadBridgeBase> m_bridge;
};

}

namespace WebKit {

WorkerAllowMainThreadBridgeBase::WorkerAllowMainThreadBridgeBase(WebCore::WorkerGlobalScope* workerGlobalScope, WebWorkerBase* webWorkerBase)
    : m_webWorkerBase(webWorkerBase)
    , m_workerGlobalScopeObserver(WorkerGlobalScopeObserver::create(workerGlobalScope, this).leakPtr())
{
}

void WorkerAllowMainThreadBridgeBase::postTaskToMainThread(PassOwnPtr<AllowParams> params)
{
    WebWorkerBase::dispatchTaskToMainThread(
        createCallbackTask(&WorkerAllowMainThreadBridgeBase::allowTask, params, this));
}

// static
void WorkerAllowMainThreadBridgeBase::allowTask(WebCore::ScriptExecutionContext*, PassOwnPtr<AllowParams> params, PassRefPtr<WorkerAllowMainThreadBridgeBase> bridge)
{
    ASSERT(isMainThread());
    if (!bridge)
        return;
    MutexLocker locker(bridge->m_mutex);
    if (!bridge->m_webWorkerBase)
        return;
    WebCommonWorkerClient* commonClient = bridge->m_webWorkerBase->commonClient();
    if (!commonClient)
        return;
    bool allow = bridge->allowOnMainThread(commonClient, params.get());
    bridge->m_webWorkerBase->workerLoaderProxy()->postTaskForModeToWorkerGlobalScope(
        createCallbackTask(&didComplete, bridge, allow), params->m_mode.isolatedCopy());
}

// static
void WorkerAllowMainThreadBridgeBase::didComplete(WebCore::ScriptExecutionContext* context, PassRefPtr<WorkerAllowMainThreadBridgeBase> bridge, bool result)
{
    bridge->m_result = result;
}

} // namespace WebKit