ipc/ipc_listener.h

   1 // Copyright (c) 2012 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 IPC_IPC_LISTENER_H_
   6 #define IPC_IPC_LISTENER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "build/build_config.h"
  10 #include "ipc/ipc_export.h"
  11
  12 namespace IPC {
  13
  14 class Message;
  15
  16 // Implemented by consumers of a Channel to receive messages.
  17 class IPC_EXPORT Listener {
  18  public:
  19   // Called when a message is received.  Returns true iff the message was
  20   // handled.
  21   virtual bool OnMessageReceived(const Message& message) = 0;
  22
  23   // Called when the channel is connected and we have received the internal
  24   // Hello message from the peer.
  25   virtual void OnChannelConnected(int32 peer_pid) {}
  26
  27   // Called when an error is detected that causes the channel to close.
  28   // This method is not called when a channel is closed normally.
  29   virtual void OnChannelError() {}
  30
  31 #if defined(OS_POSIX)
  32   // Called on the server side when a channel that listens for connections
  33   // denies an attempt to connect.
  34   virtual void OnChannelDenied() {}
  35
  36   // Called on the server side when a channel that listens for connections
  37   // has an error that causes the listening channel to close.
  38   virtual void OnChannelListenError() {}
  39 #endif  // OS_POSIX
  40
  41  protected:
  42   virtual ~Listener() {}
  43 };
  44
  45 }  // namespace IPC
  46
  47 #endif  // IPC_IPC_LISTENER_H_