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Plugins/MqttClient/Source/DTMqtt/MqttCPP/callback.h

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+// Copyright 2023 Dexter.Wan. All Rights Reserved. 
+// EMail: 45141961@qq.com
+
+#ifndef __mqtt_callback_h
+#define __mqtt_callback_h
+
+#include "MQTTAsync.h"
+#include "delivery_token.h"
+#include "types.h"
+#include <vector>
+#include <memory>
+
+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;
+
+/////////////////////////////////////////////////////////////////////////////
+// end namespace mqtt
+}
+
+#endif		// __mqtt_callback_h
+