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// Copyright 2016 The Chromium Authors
// 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/functional/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,
base::OnceClosure done) = 0;
};
} // namespace protocol
} // namespace remoting
#endif // REMOTING_PROTOCOL_MESSAGE_PIPE_H_
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