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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 DefaultSharedWorkerRepository_h
     32 #define DefaultSharedWorkerRepository_h
     33 
     34 #if ENABLE(SHARED_WORKERS)
     35 
     36 #include "ExceptionCode.h"
     37 #include "StringHash.h"
     38 #include <wtf/HashMap.h>
     39 #include <wtf/Noncopyable.h>
     40 #include <wtf/PassOwnPtr.h>
     41 #include <wtf/PassRefPtr.h>
     42 #include <wtf/RefPtr.h>
     43 #include <wtf/Threading.h>
     44 
     45 namespace WebCore {
     46 
     47     class Document;
     48     class KURL;
     49     class MessagePortChannel;
     50     class ScriptExecutionContext;
     51     class SharedWorker;
     52     class SharedWorkerProxy;
     53     class String;
     54 
     55     // Platform-specific implementation of the SharedWorkerRepository static interface.
     56     class DefaultSharedWorkerRepository : public Noncopyable {
     57     public:
     58         // Invoked once the worker script has been loaded to fire up the worker thread.
     59         void workerScriptLoaded(SharedWorkerProxy&, const String& userAgent, const String& workerScript, PassOwnPtr<MessagePortChannel>);
     60 
     61         // Internal implementation of SharedWorkerRepository::connect()
     62         void connectToWorker(PassRefPtr<SharedWorker>, PassOwnPtr<MessagePortChannel>, const KURL&, const String& name, ExceptionCode&);
     63 
     64         // Notification that a document has been detached.
     65         void documentDetached(Document*);
     66 
     67         // Removes the passed SharedWorkerProxy from the repository.
     68         void removeProxy(SharedWorkerProxy*);
     69 
     70         bool hasSharedWorkers(Document*);
     71 
     72         static DefaultSharedWorkerRepository& instance();
     73     private:
     74         DefaultSharedWorkerRepository();
     75         ~DefaultSharedWorkerRepository();
     76 
     77         PassRefPtr<SharedWorkerProxy> getProxy(const String& name, const KURL&);
     78         // Mutex used to protect internal data structures.
     79         Mutex m_lock;
     80 
     81         // List of shared workers. Expectation is that there will be a limited number of shared workers, and so tracking them in a Vector is more efficient than nested HashMaps.
     82         typedef Vector<RefPtr<SharedWorkerProxy> > SharedWorkerProxyRepository;
     83         SharedWorkerProxyRepository m_proxies;
     84     };
     85 
     86 } // namespace WebCore
     87 
     88 #endif // ENABLE(SHARED_WORKERS)
     89 
     90 #endif // DefaultSharedWorkerRepository_h
     91