content/child/shared_memory_data_consumer_handle.h

   1 // Copyright 2015 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_CHILD_SHARED_MEMORY_DATA_CONSUMER_HANDLE_H_
   6 #define CONTENT_CHILD_SHARED_MEMORY_DATA_CONSUMER_HANDLE_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "content/common/content_export.h"
  11 #include "content/public/child/request_peer.h"
  12 #include "third_party/WebKit/public/platform/WebDataConsumerHandle.h"
  13
  14 namespace content {
  15
  16 // This class is a WebDataConsumerHandle that accepts RequestPeer::ReceivedData.
  17 class CONTENT_EXPORT SharedMemoryDataConsumerHandle final
  18     : public NON_EXPORTED_BASE(blink::WebDataConsumerHandle) {
  19  private:
  20   class Context;
  21
  22  public:
  23   enum BackpressureMode {
  24     kApplyBackpressure,
  25     kDoNotApplyBackpressure,
  26   };
  27
  28   class CONTENT_EXPORT Writer final {
  29    public:
  30     Writer(const scoped_refptr<Context>& context, BackpressureMode mode);
  31     ~Writer();
  32     void AddData(scoped_ptr<RequestPeer::ReceivedData> data);
  33     void Close();
  34
  35    private:
  36     scoped_refptr<Context> context_;
  37     BackpressureMode mode_;
  38
  39     DISALLOW_COPY_AND_ASSIGN(Writer);
  40   };
  41
  42   SharedMemoryDataConsumerHandle(BackpressureMode mode,
  43                                  scoped_ptr<Writer>* writer);
  44   virtual ~SharedMemoryDataConsumerHandle();
  45
  46   virtual Result read(void* data, size_t size, Flags flags, size_t* readSize);
  47   virtual Result beginRead(const void** buffer, Flags flags, size_t* available);
  48   virtual Result endRead(size_t readSize);
  49   virtual void registerClient(Client* client);
  50   virtual void unregisterClient();
  51
  52  private:
  53   scoped_refptr<Context> context_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(SharedMemoryDataConsumerHandle);
  56 };
  57
  58 }  // namespace content
  59
  60 #endif  // CONTENT_CHILD_SHARED_MEMORY_DATA_CONSUMER_HANDLE_H_