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MqttCallback (MQTT v3 Client API)
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org.eclipse.paho.client.mqttv3</FONT>
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Interface MqttCallback</H2>
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<DL>
<DT>public interface <B>MqttCallback</B></DL>
<P>
Asynchronous message listener. Classes implementing this interface
can be passed to <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttClient.html#setCallback(org.eclipse.paho.client.mqttv3.MqttCallback)"><CODE>MqttClient.setCallback(MqttCallback)</CODE></A>,
which will create a call back on this interface.
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttCallback.html#connectionLost(java.lang.Throwable)">connectionLost</A></B>(java.lang.Throwable cause)</CODE>
<BR>
This method is called when the connection to the server is lost.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttCallback.html#deliveryComplete(org.eclipse.paho.client.mqttv3.MqttDeliveryToken)">deliveryComplete</A></B>(<A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttDeliveryToken.html" title="interface in org.eclipse.paho.client.mqttv3">MqttDeliveryToken</A> token)</CODE>
<BR>
Called when delivery for a message has been completed, and all
acknowledgements have been received. </TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttCallback.html#messageArrived(org.eclipse.paho.client.mqttv3.MqttTopic, org.eclipse.paho.client.mqttv3.MqttMessage)">messageArrived</A></B>(<A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttTopic.html" title="class in org.eclipse.paho.client.mqttv3">MqttTopic</A> topic,
<A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttMessage.html" title="class in org.eclipse.paho.client.mqttv3">MqttMessage</A> message)</CODE>
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This method is called when a message arrives from the server.
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<A NAME="connectionLost(java.lang.Throwable)"><!-- --></A><H3>
connectionLost</H3>
<PRE>
public void <B>connectionLost</B>(java.lang.Throwable cause)</PRE>
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<DD>This method is called when the connection to the server is lost.
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<DT><B>Parameters:</B><DD><CODE>cause</CODE> - the reason behind the loss of connection.</DL>
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<A NAME="messageArrived(org.eclipse.paho.client.mqttv3.MqttTopic, org.eclipse.paho.client.mqttv3.MqttMessage)"><!-- --></A><H3>
messageArrived</H3>
<PRE>
public void <B>messageArrived</B>(<A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttTopic.html" title="class in org.eclipse.paho.client.mqttv3">MqttTopic</A> topic,
<A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttMessage.html" title="class in org.eclipse.paho.client.mqttv3">MqttMessage</A> message)
throws java.lang.Exception</PRE>
<DL>
<DD>This method is called when a message arrives from the server.
<p>
This method is invoked synchronously by the MQTT client. An
acknowledgment on the network is not sent back to the server until this
method returns cleanly.</p>
<p>
If an implementation of this method throws an <code>Exception</code>, then the
client will be shut down. When the client is next re-connected, any QoS
1 or 2 messages will be redelivered.</p>
<p>
Any additional messages which arrive while an
implementation of this method is running, will build up in memory, and
will then back up on the network.</p>
<p>
If an application needs to persist data, then it
should ensure the data is persisted prior to returning from this method, as
after returning from this method, the message is considered to have been
delivered, and will not be reproducable.</p>
<p>
It is possible to send a new message within an implementation of this callback
(for example, a response to this message), but the implementation must not
disconnect the client, as it will be impossible to send an acknowledgement for
the message being processed, and a deadlock will occur.</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>topic</CODE> - the topic on which the message arrived.<DD><CODE>message</CODE> - the actual message.
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if a terminal error has occurred, and the client should be
shut down.</DL>
</DD>
</DL>
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<A NAME="deliveryComplete(org.eclipse.paho.client.mqttv3.MqttDeliveryToken)"><!-- --></A><H3>
deliveryComplete</H3>
<PRE>
public void <B>deliveryComplete</B>(<A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttDeliveryToken.html" title="interface in org.eclipse.paho.client.mqttv3">MqttDeliveryToken</A> token)</PRE>
<DL>
<DD>Called when delivery for a message has been completed, and all
acknowledgements have been received. The supplied token will be same
token which was returned when the message was first sent, if it was
sent using <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttTopic.html#publish(org.eclipse.paho.client.mqttv3.MqttMessage)"><CODE>MqttTopic.publish(MqttMessage)</CODE></A>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>token</CODE> - the delivery token associated with the message.</DL>
</DD>
</DL>
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