1 // Copyright 2012 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef IPC_IPC_LISTENER_H_
6 #define IPC_IPC_LISTENER_H_
12 #include "base/component_export.h"
13 #include "build/build_config.h"
14 #include "mojo/public/cpp/bindings/scoped_interface_endpoint_handle.h"
20 // Implemented by consumers of a Channel to receive messages.
21 class COMPONENT_EXPORT(IPC) Listener {
23 // Called when a message is received. Returns true iff the message was
25 virtual bool OnMessageReceived(const Message& message) = 0;
27 // Called when the channel is connected and we have received the internal
28 // Hello message from the peer.
29 virtual void OnChannelConnected(int32_t peer_pid) {}
31 // Called when an error is detected that causes the channel to close.
32 // This method is not called when a channel is closed normally.
33 virtual void OnChannelError() {}
35 // Called when a message's deserialization failed.
36 virtual void OnBadMessageReceived(const Message& message) {}
38 // Called when an associated interface request is received on a Channel and
39 // the Channel has no registered handler for it.
40 virtual void OnAssociatedInterfaceRequest(
41 const std::string& interface_name,
42 mojo::ScopedInterfaceEndpointHandle handle) {}
44 #if BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
45 // Called on the server side when a channel that listens for connections
46 // denies an attempt to connect.
47 virtual void OnChannelDenied() {}
49 // Called on the server side when a channel that listens for connections
50 // has an error that causes the listening channel to close.
51 virtual void OnChannelListenError() {}
52 #endif // BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
54 // Debugging helper for identifying what kind of a Listener this is.
55 // TODO(https://crbug.com/1113159): Remove this method once the bug is fixed.
56 virtual std::string ToDebugString();
59 virtual ~Listener() {}
64 #endif // IPC_IPC_LISTENER_H_