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// Copyright 2012 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_CHANNEL_DISPATCHER_BASE_H_
#define REMOTING_PROTOCOL_CHANNEL_DISPATCHER_BASE_H_
#include <memory>
#include <string>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "remoting/protocol/errors.h"
#include "remoting/protocol/message_pipe.h"
namespace remoting {
class CompoundBuffer;
namespace protocol {
class MessageChannelFactory;
// Base class for channel message dispatchers. It's responsible for
// creating the named channel. Derived dispatchers then dispatch
// incoming messages on this channel as well as send outgoing
// messages.
class ChannelDispatcherBase : public MessagePipe::EventHandler {
public:
class EventHandler {
public:
EventHandler() {}
virtual ~EventHandler() {}
// Called after the channel is initialized.
virtual void OnChannelInitialized(
ChannelDispatcherBase* channel_dispatcher) = 0;
// Called after the channel is closed.
virtual void OnChannelClosed(ChannelDispatcherBase* channel_dispatcher) = 0;
};
ChannelDispatcherBase(const ChannelDispatcherBase&) = delete;
ChannelDispatcherBase& operator=(const ChannelDispatcherBase&) = delete;
~ChannelDispatcherBase() override;
// Creates and connects the channel using |channel_factory|.
void Init(MessageChannelFactory* channel_factory,
EventHandler* event_handler);
// Initializes the channel using |message_pipe| that's already connected.
void Init(std::unique_ptr<MessagePipe> message_pipe,
EventHandler* event_handler);
const std::string& channel_name() { return channel_name_; }
// Returns true if the channel is currently connected.
bool is_connected() { return is_connected_; }
protected:
explicit ChannelDispatcherBase(const std::string& channel_name);
MessagePipe* message_pipe() { return message_pipe_.get(); }
// Child classes must override this method to handle incoming messages.
virtual void OnIncomingMessage(std::unique_ptr<CompoundBuffer> message) = 0;
private:
void OnChannelReady(std::unique_ptr<MessagePipe> message_pipe);
// MessagePipe::EventHandler interface.
void OnMessagePipeOpen() override;
void OnMessageReceived(std::unique_ptr<CompoundBuffer> message) override;
void OnMessagePipeClosed() override;
std::string channel_name_;
raw_ptr<MessageChannelFactory> channel_factory_ = nullptr;
raw_ptr<EventHandler> event_handler_ = nullptr;
bool is_connected_ = false;
std::unique_ptr<MessagePipe> message_pipe_;
};
} // namespace protocol
} // namespace remoting
#endif // REMOTING_PROTOCOL_CHANNEL_DISPATCHER_BASE_H_
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