BAEL-1992
This commit is contained in:
Philippe
parent
031bce6a26
commit
40dde25b79
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.baeldung</groupId>
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<artifactId>mqtt</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-modules</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.eclipse.paho</groupId>
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<artifactId>org.eclipse.paho.client.mqttv3</artifactId>
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<version>1.2.0</version>
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</dependency>
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</dependencies>
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</project>
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package com.baeldung.mqtt;
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import java.util.Random;
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import java.util.concurrent.Callable;
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import org.eclipse.paho.client.mqttv3.IMqttClient;
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import org.eclipse.paho.client.mqttv3.MqttMessage;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class EngineTemperatureSensor implements Callable<Void> {
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private static final Logger log = LoggerFactory.getLogger(EngineTemperatureSensor.class);
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public static final String TOPIC = "engine/temperature";
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private IMqttClient client;
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private Random rnd = new Random();
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public EngineTemperatureSensor(IMqttClient client) {
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this.client = client;
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}
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@Override
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public Void call() throws Exception {
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if ( !client.isConnected()) {
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log.info("[I31] Client not connected.");
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return null;
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}
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MqttMessage msg = readEngineTemp();
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msg.setQos(0);
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msg.setRetained(true);
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client.publish(TOPIC,msg);
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return null;
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}
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/**
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* This method simulates reading the engine temperature
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* @return
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*/
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private MqttMessage readEngineTemp() {
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double temp = 80 + rnd.nextDouble() * 20.0;
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byte[] payload = String.format("T:%04.2f",temp).getBytes();
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MqttMessage msg = new MqttMessage(payload);
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return msg;
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}
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}
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package com.baeldung.mqtt;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import java.util.UUID;
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import java.util.concurrent.Callable;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ScheduledExecutorService;
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import java.util.concurrent.TimeUnit;
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import org.eclipse.paho.client.mqttv3.MqttClient;
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import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
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import org.junit.Test;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class EngineTemperatureSensorLiveTest {
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private static Logger log = LoggerFactory.getLogger(EngineTemperatureSensorLiveTest.class);
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@Test
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public void whenSendSingleMessage_thenSuccess() throws Exception {
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String senderId = UUID.randomUUID().toString();
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MqttClient sender = new MqttClient("tcp://iot.eclipse.org:1883",senderId);
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String receiverId = UUID.randomUUID().toString();
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MqttClient receiver = new MqttClient("tcp://iot.eclipse.org:1883",receiverId);
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MqttConnectOptions options = new MqttConnectOptions();
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options.setAutomaticReconnect(true);
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options.setCleanSession(true);
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options.setConnectionTimeout(10);
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receiver.connect(options);
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sender.connect(options);
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CountDownLatch receivedSignal = new CountDownLatch(1);
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receiver.subscribe(EngineTemperatureSensor.TOPIC, (topic, msg) -> {
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log.info("[I41] Message received: topic={}, payload={}", topic, new String(msg.getPayload()));
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receivedSignal.countDown();
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});
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Callable<Void> target = new EngineTemperatureSensor(sender);
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target.call();
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receivedSignal.await(1, TimeUnit.MINUTES);
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log.info("[I51] Success !");
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}
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@Test
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public void whenSendMultipleMessages_thenSuccess() throws Exception {
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String senderId = UUID.randomUUID().toString();
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MqttClient sender = new MqttClient("tcp://iot.eclipse.org:1883",senderId);
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String receiverId = UUID.randomUUID().toString();
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MqttClient receiver = new MqttClient("tcp://iot.eclipse.org:1883",receiverId);
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MqttConnectOptions options = new MqttConnectOptions();
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options.setAutomaticReconnect(true);
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options.setCleanSession(true);
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options.setConnectionTimeout(10);
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sender.connect(options);
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receiver.connect(options);
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CountDownLatch receivedSignal = new CountDownLatch(10);
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receiver.subscribe(EngineTemperatureSensor.TOPIC, (topic, msg) -> {
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log.info("[I41] Message received: topic={}, payload={}", topic, new String(msg.getPayload()));
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receivedSignal.countDown();
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});
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Callable<Void> target = new EngineTemperatureSensor(sender);
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ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
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executor.scheduleAtFixedRate(() -> {
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try {
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target.call();
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}
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catch(Exception ex) {
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throw new RuntimeException(ex);
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}
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}, 1, 1, TimeUnit.SECONDS);
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receivedSignal.await(1, TimeUnit.DAYS);
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executor.shutdown();
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assertTrue(receivedSignal.getCount() == 0 , "Countdown should be zero");
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log.info("[I51] Success !");
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}
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}
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