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      1 /*
      2  * Copyright (C) 2009 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 #ifndef WebWorkerClientImpl_h
     32 #define WebWorkerClientImpl_h
     33 
     34 #include "core/dom/ScriptExecutionContext.h"
     35 #include "core/workers/WorkerGlobalScopeProxy.h"
     36 #include "core/workers/WorkerLoaderProxy.h"
     37 #include "core/workers/WorkerMessagingProxy.h"
     38 #include "core/workers/WorkerObjectProxy.h"
     39 
     40 #include "WebWorkerBase.h"
     41 #include "public/platform/WebFileSystem.h"
     42 #include "public/platform/WebFileSystemType.h"
     43 #include "wtf/OwnPtr.h"
     44 #include "wtf/PassOwnPtr.h"
     45 #include "wtf/RefPtr.h"
     46 
     47 
     48 namespace WebKit {
     49 class WebWorker;
     50 class WebFrameImpl;
     51 
     52 // This class provides chromium implementation for WorkerGlobalScopeProxy, WorkerObjectProxy amd WorkerLoaderProxy
     53 // for in-proc dedicated workers. It also acts as a bridge for workers to chromium implementation of file systems,
     54 // databases and other related functionality.
     55 //
     56 // In essence, this class decorates WorkerMessagingProxy.
     57 //
     58 // It is imperative that this class inherit from WorkerMessagingProxy rather than delegate to an instance of
     59 // WorkerMessagingProxy, because that class tracks and reports its activity to outside callers, and manages
     60 // its own lifetime, via calls to workerObjectDestroyed, workerGlobalScopeDestroyed, workerGlobalScopeClosed, etc. It
     61 // is basically impossible to correctly manage the lifetime of this class separately from WorkerMessagingProxy.
     62 class WebWorkerClientImpl : public WebCore::WorkerMessagingProxy
     63                           , public WebWorkerBase
     64                           , public WebCommonWorkerClient {
     65 public:
     66     // WebCore::WorkerGlobalScopeProxy Factory.
     67     static WebCore::WorkerGlobalScopeProxy* createWorkerGlobalScopeProxy(WebCore::Worker*);
     68 
     69     // WebCore::WorkerGlobalScopeProxy methods:
     70     // These are called on the thread that created the worker.  In the renderer
     71     // process, this will be the main WebKit thread.
     72     virtual void terminateWorkerGlobalScope() OVERRIDE;
     73 
     74     // WebCore::WorkerLoaderProxy methods
     75     virtual WebWorkerBase* toWebWorkerBase() OVERRIDE;
     76 
     77     // WebWorkerBase methods:
     78     virtual WebCore::WorkerLoaderProxy* workerLoaderProxy() OVERRIDE { return this; }
     79     virtual WebCommonWorkerClient* commonClient() OVERRIDE { return this; }
     80     virtual WebView* view() const OVERRIDE;
     81 
     82     // WebCommonWorkerClient methods:
     83     virtual bool allowDatabase(WebFrame*, const WebString& name, const WebString& displayName, unsigned long estimatedSize) OVERRIDE;
     84     virtual bool allowFileSystem();
     85     virtual void openFileSystem(WebFileSystemType, long long size, bool create,
     86         WebFileSystemCallbacks*) OVERRIDE;
     87     virtual bool allowIndexedDB(const WebString& name) OVERRIDE;
     88 
     89 private:
     90     WebWorkerClientImpl(WebCore::Worker*, WebFrameImpl*, PassOwnPtr<WebCore::WorkerClients>);
     91     virtual ~WebWorkerClientImpl();
     92 
     93     WebFrameImpl* m_webFrame;
     94 };
     95 
     96 } // namespace WebKit;
     97 
     98 #endif
     99