BAEL-3457 Apache RocketMQ

apache-rocketmq/README.md

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+## Apache RocketMQ
+
+This module contains articles about Apache RocketMQ
+
+### Relevant Articles: 

apache-rocketmq/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>apache-rocketmq</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <name>apache-rocketmq</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.rocketmq</groupId>
+            <artifactId>rocketmq-spring-boot-starter</artifactId>
+            <version>2.0.4</version>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <geode.core>1.6.0</geode.core>
+    </properties>
+</project>

apache-rocketmq/src/main/java/com/baeldung/rocketmq/consumer/CartEventConsumer.java

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+package com.baeldung.rocketmq.consumer;
+
+import com.baeldung.rocketmq.event.CartItemEvent;
+import org.apache.rocketmq.spring.annotation.RocketMQMessageListener;
+import org.apache.rocketmq.spring.core.RocketMQListener;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.stereotype.Service;
+
+@SpringBootApplication
+public class CartEventConsumer {
+
+    public static void main(String[] args) {
+        SpringApplication.run(CartEventConsumer.class, args);
+    }
+
+    @Service
+    @RocketMQMessageListener(topic = "cart-item-add-topic", consumerGroup = "cart-consumer_cart-item-add-topic")
+    public class CardItemAddConsumer implements RocketMQListener<CartItemEvent> {
+        public void onMessage(CartItemEvent addItemEvent) {
+            System.out.println("Adding item: " + addItemEvent);
+            // logic
+        }
+    }
+
+    @Service
+    @RocketMQMessageListener(topic = "cart-item-removed-topic", consumerGroup = "cart-consumer_cart-item-removed-topic")
+    public class CardItemRemoveConsumer implements RocketMQListener<CartItemEvent> {
+        public void onMessage(CartItemEvent removeItemEvent) {
+            System.out.println("Removing item: " + removeItemEvent);
+            // logic
+        }
+    }
+}

apache-rocketmq/src/main/java/com/baeldung/rocketmq/event/CartItemEvent.java

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+package com.baeldung.rocketmq.event;
+
+public class CartItemEvent {
+    private String itemId;
+    private int quantity;
+
+    public CartItemEvent(String itemId, int quantity) {
+        this.itemId = itemId;
+        this.quantity = quantity;
+    }
+
+    public String getItemId() {
+        return itemId;
+    }
+
+    public void setItemId(String itemId) {
+        this.itemId = itemId;
+    }
+
+    public int getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(int quantity) {
+        this.quantity = quantity;
+    }
+
+    @Override
+    public String toString() {
+        return "CartItemEvent{" + "itemId='" + itemId + '\'' + ", quantity=" + quantity + '}';
+    }
+}

apache-rocketmq/src/main/java/com/baeldung/rocketmq/producer/CartEventProducer.java

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+package com.baeldung.rocketmq.producer;
+
+
+import com.baeldung.rocketmq.event.CartItemEvent;
+import org.apache.rocketmq.spring.core.RocketMQTemplate;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class CartEventProducer implements CommandLineRunner {
+
+    @Autowired
+    private RocketMQTemplate rocketMQTemplate;
+
+    public static void main(String[] args) {
+        SpringApplication.run(CartEventProducer.class, args);
+    }
+
+    public void run(String... args) throws Exception {
+        rocketMQTemplate.convertAndSend("cart-item-add-topic", new CartItemEvent("bike", 1));
+        rocketMQTemplate.convertAndSend("cart-item-add-topic", new CartItemEvent("computer", 2));
+        rocketMQTemplate.convertAndSend("cart-item-removed-topic", new CartItemEvent("bike", 1));
+    }
+}

apache-rocketmq/src/main/resources/application.properties

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+rocketmq.name-server=127.0.0.1:9876
+rocketmq.producer.group=my-group
+rocketmq.producer.send-message-timeout=300000
+rocketmq.producer.compress-message-body-threshold=4096
+rocketmq.producer.max-message-size=4194304
+rocketmq.producer.retry-times-when-send-async-failed=0
+rocketmq.producer.retry-next-server=true
+rocketmq.producer.retry-times-when-send-failed=2
+