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/////////////////////////////////////////////////////////////////////////////
/// @file callback.h
/// Declaration of MQTT callback class
/// @date May 1, 2013
/// @author Frank Pagliughi
/////////////////////////////////////////////////////////////////////////////
/*******************************************************************************
* Copyright (c) 2013-2019 Frank Pagliughi <fpagliughi@mindspring.com>
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* and Eclipse Distribution License v1.0 which accompany this distribution.
*
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v20.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Frank Pagliughi - initial implementation and documentation
*******************************************************************************/
#ifndef __mqtt_callback_h
#define __mqtt_callback_h
#include <memory>
#include <vector>
#include "MQTTAsync.h"
#include "mqtt/delivery_token.h"
#include "mqtt/types.h"
namespace mqtt {
/////////////////////////////////////////////////////////////////////////////
/**
* Provides a mechanism for tracking the completion of an asynchronous
* action.
*/
class callback
{
public:
/** Smart/shared pointer to an object of this type */
using ptr_t = std::shared_ptr<callback>;
/** Smart/shared pointer to a const object of this type */
using const_ptr_t = std::shared_ptr<const callback>;
/**
* Virtual destructor.
*/
virtual ~callback() {}
/**
* This method is called when the client is connected.
* Note that, in response to an initial connect(), the token from the
* connect call is also signaled with an on_success(). That occurs just
* before this is called.
*/
virtual void connected(const string& /*cause*/) {}
/**
* This method is called when the connection to the server is lost.
*/
virtual void connection_lost(const string& /*cause*/) {}
/**
* This method is called when a message arrives from the server.
*/
virtual void message_arrived(const_message_ptr /*msg*/) {}
/**
* Called when delivery for a message has been completed, and all
* acknowledgments have been received.
*/
virtual void delivery_complete(delivery_token_ptr /*tok*/) {}
};
/** Smart/shared pointer to a callback object */
using callback_ptr = callback::ptr_t;
/** Smart/shared pointer to a const callback object */
using const_callback_ptr = callback::const_ptr_t;
/////////////////////////////////////////////////////////////////////////////
} // namespace mqtt
#endif // __mqtt_callback_h
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