Package software.amazon.awssdk.crt.mqtt

Class MqttClientConnection

java.lang.Object

software.amazon.awssdk.crt.CrtResource

software.amazon.awssdk.crt.mqtt.MqttClientConnection

All Implemented Interfaces:

AutoCloseable

public class MqttClientConnection
extends CrtResource

This class wraps aws-c-mqtt to provide the basic MQTT pub/sub functionality via the AWS Common Runtime MqttClientConnection represents a single connection from one MqttClient to an MQTT service endpoint

Nested Class Summary

Nested classes/interfaces inherited from class software.amazon.awssdk.crt.CrtResource

CrtResource.ResourceInstance

Constructor Summary

Constructors

Constructor	Description
MqttClientConnection(MqttConnectionConfig config)	Constructs a new MqttClientConnection.
MqttClientConnection(Mqtt5Client mqtt5client, MqttClientConnectionEvents callbacks)	Constructs a new MqttClientConnection from a Mqtt5Client.

Method Summary

Modifier and Type	Method	Description
CompletableFuture<Boolean>	connect()	Connect to the service endpoint and start a session
CompletableFuture<Void>	disconnect()	Disconnects the current session
MqttClientConnectionOperationStatistics	getOperationStatistics()	Returns statistics about the current state of the MqttClientConnection's queue of operations.
void	onMessage(Consumer<MqttMessage> handler)	Sets a handler to be invoked whenever a message arrives, subscription or not
CompletableFuture<Integer>	publish(MqttMessage message)	Publishes a message to a topic.
CompletableFuture<Integer>	publish(MqttMessage message, QualityOfService qos, boolean retain)	Deprecated.
CompletableFuture<Integer>	subscribe(String topic, QualityOfService qos)	Subscribes to a topic without a handler (messages will only be delivered to the OnMessage handler)
CompletableFuture<Integer>	subscribe(String topic, QualityOfService qos, Consumer<MqttMessage> handler)	Subscribes to a topic
CompletableFuture<Integer>	unsubscribe(String topic)	Unsubscribes from a topic

Methods inherited from class software.amazon.awssdk.crt.CrtResource

addRef, addReferenceTo, close, collectNativeResource, collectNativeResources, decRef, getNativeHandle, getResourceLogDescription, isNull, logNativeResources, logNativeResources, removeReferenceTo, setDescription, waitForNoResources

Methods inherited from class java.lang.Object

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

Constructor Details

MqttClientConnection

public MqttClientConnection(MqttConnectionConfig config)
                     throws MqttException

Constructs a new MqttClientConnection. Connections are reusable after being disconnected.

Parameters:

config - Configuration to use

Throws:

MqttException - If mqttClient is null

MqttClientConnection

public MqttClientConnection(Mqtt5Client mqtt5client,
 MqttClientConnectionEvents callbacks)
                     throws MqttException

Constructs a new MqttClientConnection from a Mqtt5Client. Connections are reusable after being disconnected.

Parameters:

mqtt5client - the mqtt5 client to setup from

callbacks - connection callbacks triggered when receive connection events

Throws:

MqttException - If mqttClient is null

Method Details

connect

public CompletableFuture<Boolean> connect()
                                   throws MqttException

Connect to the service endpoint and start a session

Returns:

Future result is true if resuming a session, false if clean session

Throws:

MqttException - If the port is out of range

disconnect

public CompletableFuture<Void> disconnect()

Disconnects the current session

Returns:

When this future completes, the disconnection is complete

subscribe

public CompletableFuture<Integer> subscribe(String topic,
 QualityOfService qos,
 Consumer<MqttMessage> handler)

Subscribes to a topic

Parameters:

topic - The topic to subscribe to

qos - QualityOfService for this subscription

handler - A handler which can receive an MqttMessage when a message is published to the topic

Returns:

Future result is the packet/message id associated with the subscribe operation

subscribe

public CompletableFuture<Integer> subscribe(String topic,
 QualityOfService qos)

Subscribes to a topic without a handler (messages will only be delivered to the OnMessage handler)

Parameters:

topic - The topic to subscribe to

qos - QualityOfService for this subscription

Returns:

Future result is the packet/message id associated with the subscribe operation

onMessage

public void onMessage(Consumer<MqttMessage> handler)

Sets a handler to be invoked whenever a message arrives, subscription or not

Parameters:

handler - A handler which can receive any MqttMessage

unsubscribe

public CompletableFuture<Integer> unsubscribe(String topic)

Unsubscribes from a topic

Parameters:

topic - The topic to unsubscribe from

Returns:

Future result is the packet/message id associated with the unsubscribe operation

publish

public CompletableFuture<Integer> publish(MqttMessage message)

Publishes a message to a topic.

Parameters:

message - The message to publish.

Returns:

Future value is the packet/message id associated with the publish operation

publish

@Deprecated
public CompletableFuture<Integer> publish(MqttMessage message,
 QualityOfService qos,
 boolean retain)

Deprecated.

getOperationStatistics

public MqttClientConnectionOperationStatistics getOperationStatistics()

Returns statistics about the current state of the MqttClientConnection's queue of operations.

Returns:

Current state of the connection's queue of operations.