| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef REMOTING_PROTOCOL_MESSAGE_PIPE_H_ |
| #define REMOTING_PROTOCOL_MESSAGE_PIPE_H_ |
| |
| #include <memory> |
| |
| #include "base/callback_forward.h" |
| |
| namespace google { |
| namespace protobuf { |
| class MessageLite; |
| } // namespace protobuf |
| } // namespace google |
| |
| namespace remoting { |
| |
| class CompoundBuffer; |
| |
| namespace protocol { |
| |
| // Represents a bi-directional pipe that allows to send and receive messages. |
| class MessagePipe { |
| public: |
| class EventHandler { |
| public: |
| // Called when the channel is open. |
| virtual void OnMessagePipeOpen() = 0; |
| |
| // Called when a message is received. |
| virtual void OnMessageReceived(std::unique_ptr<CompoundBuffer> message) = 0; |
| |
| // Called when the channel is closed. |
| virtual void OnMessagePipeClosed() = 0; |
| |
| protected: |
| virtual ~EventHandler() {} |
| }; |
| |
| virtual ~MessagePipe() {} |
| |
| // Starts the channel. Must be called immediately after MessagePipe is |
| // created. |event_handler| will be notified when state of the pipe changes or |
| // when a message is received. |
| virtual void Start(EventHandler* event_handler) = 0; |
| |
| // Sends a message. |done| is called when the message has been sent to the |
| // client, but it doesn't mean that the client has received it. |done| is |
| // never called if the message is never sent (e.g. if the pipe is destroyed |
| // before the message is sent). |
| // |message| is guaranteed to be used synchronously. It won't be referred |
| // after this function returns. |
| // TODO(zijiehe): the |message| should be const-ref. |
| virtual void Send(google::protobuf::MessageLite* message, |
| const base::Closure& done) = 0; |
| }; |
| |
| } // namespace protocol |
| } // namespace remoting |
| |
| #endif // REMOTING_PROTOCOL_MESSAGE_PIPE_H_ |