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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 MOJO_SYSTEM_DATA_PIPE_PRODUCER_DISPATCHER_H_
      6 #define MOJO_SYSTEM_DATA_PIPE_PRODUCER_DISPATCHER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/compiler_specific.h"
     10 #include "base/memory/ref_counted.h"
     11 #include "mojo/system/dispatcher.h"
     12 #include "mojo/system/system_impl_export.h"
     13 
     14 namespace mojo {
     15 namespace system {
     16 
     17 class DataPipe;
     18 
     19 // This is the |Dispatcher| implementation for the producer handle for data
     20 // pipes (created by the Mojo primitive |MojoCreateDataPipe()|). This class is
     21 // thread-safe.
     22 class MOJO_SYSTEM_IMPL_EXPORT DataPipeProducerDispatcher : public Dispatcher {
     23  public:
     24   DataPipeProducerDispatcher();
     25 
     26   // Must be called before any other methods.
     27   void Init(scoped_refptr<DataPipe> data_pipe);
     28 
     29   // |Dispatcher| public methods:
     30   virtual Type GetType() const OVERRIDE;
     31 
     32  private:
     33   virtual ~DataPipeProducerDispatcher();
     34 
     35   // |Dispatcher| protected methods:
     36   virtual void CancelAllWaitersNoLock() OVERRIDE;
     37   virtual void CloseImplNoLock() OVERRIDE;
     38   virtual scoped_refptr<Dispatcher>
     39       CreateEquivalentDispatcherAndCloseImplNoLock() OVERRIDE;
     40   virtual MojoResult WriteDataImplNoLock(const void* elements,
     41                                          uint32_t* num_bytes,
     42                                          MojoWriteDataFlags flags) OVERRIDE;
     43   virtual MojoResult BeginWriteDataImplNoLock(
     44       void** buffer,
     45       uint32_t* buffer_num_bytes,
     46       MojoWriteDataFlags flags) OVERRIDE;
     47   virtual MojoResult EndWriteDataImplNoLock(
     48       uint32_t num_bytes_written) OVERRIDE;
     49   virtual MojoResult AddWaiterImplNoLock(Waiter* waiter,
     50                                          MojoHandleSignals signals,
     51                                          uint32_t context) OVERRIDE;
     52   virtual void RemoveWaiterImplNoLock(Waiter* waiter) OVERRIDE;
     53   virtual bool IsBusyNoLock() const OVERRIDE;
     54 
     55   // Protected by |lock()|:
     56   scoped_refptr<DataPipe> data_pipe_;  // This will be null if closed.
     57 
     58   DISALLOW_COPY_AND_ASSIGN(DataPipeProducerDispatcher);
     59 };
     60 
     61 }  // namespace system
     62 }  // namespace mojo
     63 
     64 #endif  // MOJO_SYSTEM_DATA_PIPE_PRODUCER_DISPATCHER_H_
     65