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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_BROWSER_STREAMS_STREAM_CONTEXT_H_
      6 #define CONTENT_BROWSER_STREAMS_STREAM_CONTEXT_H_
      7 
      8 #include "base/memory/ref_counted.h"
      9 #include "base/memory/scoped_ptr.h"
     10 #include "base/sequenced_task_runner_helpers.h"
     11 #include "content/common/content_export.h"
     12 #include "content/public/browser/browser_thread.h"
     13 
     14 namespace content {
     15 class BrowserContext;
     16 class StreamRegistry;
     17 struct StreamContextDeleter;
     18 
     19 // A context class that keeps track of StreamRegistry used by the chrome.
     20 // There is an instance associated with each BrowserContext. There could be
     21 // multiple URLRequestContexts in the same browser context that refers to the
     22 // same instance.
     23 //
     24 // All methods, except the ctor, are expected to be called on
     25 // the IO thread (unless specifically called out in doc comments).
     26 class StreamContext
     27     : public base::RefCountedThreadSafe<StreamContext,
     28                                         StreamContextDeleter> {
     29  public:
     30   StreamContext();
     31 
     32   CONTENT_EXPORT static StreamContext* GetFor(BrowserContext* browser_context);
     33 
     34   void InitializeOnIOThread();
     35 
     36   StreamRegistry* registry() const { return registry_.get(); }
     37 
     38  protected:
     39   virtual ~StreamContext();
     40 
     41  private:
     42   friend class base::DeleteHelper<StreamContext>;
     43   friend class base::RefCountedThreadSafe<StreamContext,
     44                                           StreamContextDeleter>;
     45   friend struct StreamContextDeleter;
     46 
     47   void DeleteOnCorrectThread() const;
     48 
     49   scoped_ptr<StreamRegistry> registry_;
     50 };
     51 
     52 struct StreamContextDeleter {
     53   static void Destruct(const StreamContext* context) {
     54     context->DeleteOnCorrectThread();
     55   }
     56 };
     57 
     58 }  // namespace content
     59 
     60 #endif  // CONTENT_BROWSER_STREAMS_STREAM_CONTEXT_H_
     61