com.amazonaws.services.iot.client

Class AWSIotTopic

java.lang.Object

com.amazonaws.services.iot.client.AWSIotMessage

com.amazonaws.services.iot.client.AWSIotTopic

All Implemented Interfaces:

AwsIotMessageCallback, AwsIotTopicCallback

Direct Known Subclasses:

AwsIotDeviceCommandAckListener, AwsIotDeviceDeltaListener

public class AWSIotTopic
extends AWSIotMessage
implements AwsIotTopicCallback

This class is used for subscribing to a topic in the subscription APIs, such as AWSIotMqttClient.subscribe(AWSIotTopic topic).

In contains a callback function, onMessage(com.amazonaws.services.iot.client.AWSIotMessage), that is invoked when a subscribed message has arrived. In most cases, applications are expected to override the default onMessage(com.amazonaws.services.iot.client.AWSIotMessage) method in order to access the message payload.

This class extends AWSIotMessage, therefore callback functions in AWSIotMessage can also be overridden if the application wishes to be invoked for the outcomes of the subscription API. For more details, please refer to AWSIotMessage.

Field Summary

Fields inherited from class com.amazonaws.services.iot.client.AWSIotMessage

errorCode, errorMessage, payload, qos, topic

Constructor Summary

Constructors

Constructor and Description
AWSIotTopic(String topic) Instantiates a new topic object.
AWSIotTopic(String topic, AWSIotQos qos) Instantiates a new topic object.

Method Summary

Modifier and Type	Method and Description
void	onMessage(AWSIotMessage message) Callback function to be invoked upon the arrival of a subscribed message.

Methods inherited from class com.amazonaws.services.iot.client.AWSIotMessage

getErrorCode, getErrorMessage, getPayload, getQos, getStringPayload, getTopic, onFailure, onSuccess, onTimeout, setErrorCode, setErrorMessage, setPayload, setQos, setStringPayload, setTopic

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AWSIotTopic

public AWSIotTopic(String topic)

Instantiates a new topic object.

Parameters:

topic - the topic to be subscribed to

AWSIotTopic

public AWSIotTopic(String topic,
                   AWSIotQos qos)

Instantiates a new topic object.

Parameters:

topic - the topic to be subscribed to

qos - the MQTT QoS level for the subscription

Method Detail

onMessage

public void onMessage(AWSIotMessage message)

Callback function to be invoked upon the arrival of a subscribed message.

Specified by:

onMessage in interface AwsIotTopicCallback

Parameters:

message - the message received