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      1 // Copyright 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 LIBRARIES_NACL_IO_STREAM_STREAM_EVENT_EMITTER_H_
      6 #define LIBRARIES_NACL_IO_STREAM_STREAM_EVENT_EMITTER_H_
      7 
      8 #include "nacl_io/event_emitter.h"
      9 
     10 #include "sdk_util/macros.h"
     11 #include "sdk_util/scoped_ref.h"
     12 
     13 namespace nacl_io {
     14 
     15 class FIFOInterface;
     16 class StreamEventEmitter;
     17 class StreamNode;
     18 
     19 typedef sdk_util::ScopedRef<StreamEventEmitter> ScopedStreamEventEmitter;
     20 
     21 class StreamEventEmitter : public EventEmitter {
     22  public:
     23   StreamEventEmitter();
     24 
     25   void AttachStream(StreamNode* stream);
     26   void DetachStream();
     27 
     28   StreamNode* stream() { return stream_; }
     29 
     30  protected:
     31   virtual FIFOInterface* in_fifo() = 0;
     32   virtual FIFOInterface* out_fifo() = 0;
     33   void UpdateStatus_Locked();
     34 
     35  protected:
     36   StreamNode* stream_;
     37   DISALLOW_COPY_AND_ASSIGN(StreamEventEmitter);
     38 };
     39 
     40 }  // namespace nacl_io
     41 
     42 #endif  // LIBRARIES_NACL_IO_STREAM_STREAM_EVENT_EMITTER_H_
     43