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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 
     13 namespace content {
     14 class BrowserContext;
     15 class StreamRegistry;
     16 struct StreamContextDeleter;
     17 
     18 // A context class that keeps track of StreamRegistry used by the chrome.
     19 // There is an instance associated with each BrowserContext. There could be
     20 // multiple URLRequestContexts in the same browser context that refers to the
     21 // same instance.
     22 //
     23 // All methods, except the ctor, are expected to be called on
     24 // the IO thread (unless specifically called out in doc comments).
     25 class StreamContext
     26     : public base::RefCountedThreadSafe<StreamContext,
     27                                         StreamContextDeleter> {
     28  public:
     29   StreamContext();
     30 
     31   CONTENT_EXPORT static StreamContext* GetFor(BrowserContext* browser_context);
     32 
     33   void InitializeOnIOThread();
     34 
     35   StreamRegistry* registry() const { return registry_.get(); }
     36 
     37  protected:
     38   virtual ~StreamContext();
     39 
     40  private:
     41   friend class base::DeleteHelper<StreamContext>;
     42   friend class base::RefCountedThreadSafe<StreamContext,
     43                                           StreamContextDeleter>;
     44   friend struct StreamContextDeleter;
     45 
     46   void DeleteOnCorrectThread() const;
     47 
     48   scoped_ptr<StreamRegistry> registry_;
     49 };
     50 
     51 struct StreamContextDeleter {
     52   static void Destruct(const StreamContext* context) {
     53     context->DeleteOnCorrectThread();
     54   }
     55 };
     56 
     57 }  // namespace content
     58 
     59 #endif  // CONTENT_BROWSER_STREAMS_STREAM_CONTEXT_H_
     60