content/browser/streams/stream_context.h

   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_