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      1 /*
      2  * Copyright (C) 2010, 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "WorkerAllowMainThreadBridgeBase.h"
     33 
     34 #include "wtf/MainThread.h"
     35 
     36 namespace {
     37 
     38 // Observes the worker context and notifies the bridge. This is kept
     39 // separate from the bridge so that it's destroyed correctly by ~Observer.
     40 class WorkerGlobalScopeObserver : public WebCore::WorkerGlobalScope::Observer {
     41 public:
     42     static PassOwnPtr<WorkerGlobalScopeObserver> create(WebCore::WorkerGlobalScope* context, PassRefPtr<WebKit::WorkerAllowMainThreadBridgeBase> bridge)
     43     {
     44         return adoptPtr(new WorkerGlobalScopeObserver(context, bridge));
     45     }
     46 
     47     // WorkerGlobalScope::Observer method.
     48     virtual void notifyStop()
     49     {
     50         if (!m_bridge)
     51             return;
     52         m_bridge->cancel();
     53     }
     54 
     55 private:
     56     WorkerGlobalScopeObserver(WebCore::WorkerGlobalScope* context, PassRefPtr<WebKit::WorkerAllowMainThreadBridgeBase> bridge)
     57         : WebCore::WorkerGlobalScope::Observer(context)
     58         , m_bridge(bridge)
     59     {
     60     }
     61 
     62     RefPtr<WebKit::WorkerAllowMainThreadBridgeBase> m_bridge;
     63 };
     64 
     65 }
     66 
     67 namespace WebKit {
     68 
     69 WorkerAllowMainThreadBridgeBase::WorkerAllowMainThreadBridgeBase(WebCore::WorkerGlobalScope* workerGlobalScope, WebWorkerBase* webWorkerBase)
     70     : m_webWorkerBase(webWorkerBase)
     71     , m_workerGlobalScopeObserver(WorkerGlobalScopeObserver::create(workerGlobalScope, this).leakPtr())
     72 {
     73 }
     74 
     75 void WorkerAllowMainThreadBridgeBase::postTaskToMainThread(PassOwnPtr<AllowParams> params)
     76 {
     77     WebWorkerBase::dispatchTaskToMainThread(
     78         createCallbackTask(&WorkerAllowMainThreadBridgeBase::allowTask, params, this));
     79 }
     80 
     81 // static
     82 void WorkerAllowMainThreadBridgeBase::allowTask(WebCore::ScriptExecutionContext*, PassOwnPtr<AllowParams> params, PassRefPtr<WorkerAllowMainThreadBridgeBase> bridge)
     83 {
     84     ASSERT(isMainThread());
     85     if (!bridge)
     86         return;
     87     MutexLocker locker(bridge->m_mutex);
     88     if (!bridge->m_webWorkerBase)
     89         return;
     90     WebCommonWorkerClient* commonClient = bridge->m_webWorkerBase->commonClient();
     91     if (!commonClient)
     92         return;
     93     bool allow = bridge->allowOnMainThread(commonClient, params.get());
     94     bridge->m_webWorkerBase->workerLoaderProxy()->postTaskForModeToWorkerGlobalScope(
     95         createCallbackTask(&didComplete, bridge, allow), params->m_mode.isolatedCopy());
     96 }
     97 
     98 // static
     99 void WorkerAllowMainThreadBridgeBase::didComplete(WebCore::ScriptExecutionContext* context, PassRefPtr<WorkerAllowMainThreadBridgeBase> bridge, bool result)
    100 {
    101     bridge->m_result = result;
    102 }
    103 
    104 } // namespace WebKit
    105