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// Copyright 2014 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_SIGNALING_SIGNAL_STRATEGY_H_
#define REMOTING_SIGNALING_SIGNAL_STRATEGY_H_
#include <string>
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
namespace buzz {
class XmlElement;
} // namespace buzz
namespace remoting {
class SignalStrategy {
public:
enum State {
// Connection is being established.
CONNECTING,
// Signalling is connected.
CONNECTED,
// Connection is closed due to an error or because Disconnect()
// was called.
DISCONNECTED,
};
enum Error {
OK,
AUTHENTICATION_FAILED,
NETWORK_ERROR,
PROTOCOL_ERROR,
};
// Callback interface for signaling event. Event handlers are not
// allowed to destroy SignalStrategy, but may add or remove other
// listeners.
class Listener {
public:
virtual ~Listener() {}
// Called after state of the connection has changed. If the state
// is DISCONNECTED, then GetError() can be used to get the reason
// for the disconnection.
virtual void OnSignalStrategyStateChange(State state) = 0;
// Must return true if the stanza was handled, false
// otherwise. The signal strategy must not be deleted from a
// handler of this message.
virtual bool OnSignalStrategyIncomingStanza(
const buzz::XmlElement* stanza) = 0;
};
SignalStrategy() {}
virtual ~SignalStrategy() {}
// Starts connection attempt. If connection is currently active
// disconnects it and opens a new connection (implicit disconnect
// triggers CLOSED notification). Connection is finished
// asynchronously.
virtual void Connect() = 0;
// Disconnects current connection if connected. Triggers CLOSED
// notification.
virtual void Disconnect() = 0;
// Returns current state.
virtual State GetState() const = 0;
// Returns the last error. Set when state changes to DISCONNECT.
virtual Error GetError() const = 0;
// Returns local JID or an empty string when not connected.
virtual std::string GetLocalJid() const = 0;
// Add a |listener| that can listen to all incoming
// messages. Doesn't take ownership of the |listener|. All listeners
// must be removed before this object is destroyed.
virtual void AddListener(Listener* listener) = 0;
// Remove a |listener| previously added with AddListener().
virtual void RemoveListener(Listener* listener) = 0;
// Sends a raw XMPP stanza. Returns false if the stanza couldn't be send.
virtual bool SendStanza(scoped_ptr<buzz::XmlElement> stanza) = 0;
// Returns new ID that should be used for the next outgoing IQ
// request.
virtual std::string GetNextId() = 0;
private:
DISALLOW_COPY_AND_ASSIGN(SignalStrategy);
};
} // namespace remoting
#endif // REMOTING_SIGNALING_SIGNAL_STRATEGY_H_
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