ActiveMQ在分佈式項目中的解耦應用

運用消息中間件activeMQ實現運營商後臺與搜索服務的零耦合。運營商執行商品審覈後，向activeMQ發送消息（SKU列表），搜索服務從activeMQ接收到消息並導入到solr索引庫。
審覈通過導入solr索引使用的是點對點的隊列消息
先解除耦合，移除依賴

<dependency>
    <groupId>com.weilinyang</groupId>
    <artifactId>youlexuan_search_interface</artifactId>
    <version>1.0.0</version>
</dependency>

引入新的pom依賴

<!--ActiveMQ消息中間件-->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jms</artifactId>
</dependency>
<dependency>
    <groupId>org.apache.activemq</groupId>
    <artifactId>activemq-client</artifactId>
</dependency>

添加配置文件spring-jms-producer.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    		http://www.springframework.org/schema/beans/spring-beans.xsd
    		http://www.springframework.org/schema/context
    		http://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan base-package="com.weilinyang" />

    <!-- 產生Connection的ConnectionFactory，由對應的 JMS服務廠商提供 -->
    <bean id="targetConnectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
        <property name="brokerURL" value="tcp://192.168.2.123:61616" />
    </bean>

    <!-- Spring用於管理ConnectionFactory的ConnectionFactory -->
    <bean id="connectionFactory"
          class="org.springframework.jms.connection.SingleConnectionFactory">
        <property name="targetConnectionFactory" ref="targetConnectionFactory" />
    </bean>

    <!-- Spring提供的JMS工具類，它可以進行消息發送、接收等 -->
    <bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate">
        <property name="connectionFactory" ref="connectionFactory" />
    </bean>

    <!-- 隊列目的地，點對點信息 -->
    <bean id="importSolrDestination" class="org.apache.activemq.command.ActiveMQQueue">
        <constructor-arg value="importSolr_queue" />
    </bean>
</beans>

在goodsController中注入JmsTemplate和ActiveMQQueue的bean

createObjectMessage方法要求傳遞的對象能夠進行序列化，而List不能序列化，我們把list轉成字符串發送

@Autowired
private JmsTemplate jmsTemplate;
@Autowired
private ActiveMQQueue importQueue;

@RequestMapping("/updateAuditStatus")
public Result updateStatus(Long[] ids,String status){
	try {
		goodsService.updateStatus(ids,status);
		//如果審覈成功，將數據同步到索引庫
		if ("1".equals(status)){
			List<TbItem> items = goodsService.findItemByGoodsId(ids, status);
//				searchService.importList(items);
			String itemStr = JSON.toJSONString(items);
			// 向消息中間件 發送 需要導入的數據
			jmsTemplate.send(importQueue, new MessageCreator() {
				@Override
				public Message createMessage(Session session) throws JMSException {
					return session.createTextMessage(itemStr);
				}
			});

		}
		return new Result(true,"審覈成功");
	}catch (Exception e){
		e.printStackTrace();
		return new Result(false,"審覈失敗");
	}
}

在search_service中加入監聽器
配置spring-jms-consumer.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    		http://www.springframework.org/schema/beans/spring-beans.xsd
    		http://www.springframework.org/schema/context
    		http://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan base-package="com.weilinyang" />

    <!-- 產生Connection的ConnectionFactory，由對應的 JMS服務廠商提供 -->
    <bean id="targetConnectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
        <property name="brokerURL" value="tcp://192.168.2.123:61616" />
    </bean>

    <!-- Spring用於管理ConnectionFactory的ConnectionFactory -->
    <bean id="connectionFactory"
          class="org.springframework.jms.connection.SingleConnectionFactory">
        <property name="targetConnectionFactory" ref="targetConnectionFactory" />
    </bean>

    <!-- Spring提供的JMS工具類，它可以進行消息發送、接收等 -->
    <bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate">
        <property name="connectionFactory" ref="connectionFactory" />
    </bean>

    <!-- 隊列目的地，點對點信息 -->
    <bean id="importSolrDestination" class="org.apache.activemq.command.ActiveMQQueue">
        <constructor-arg value="importSolr_queue" />
    </bean>

    <!-- 消息監聽容器 -->
    <bean
            class="org.springframework.jms.listener.DefaultMessageListenerContainer">
        <property name="connectionFactory" ref="connectionFactory" />
        <property name="destination" ref="importSolrDestination" />
        <property name="messageListener" ref="importSolrListener" />
    </bean>

</beans>

創建監聽器類，並加入@Component註解

@Component
public class ImportSolrListener implements MessageListener {
    @Autowired
    private ItemSearchService searchService;
    @Override
    public void onMessage(Message message) {
        TextMessage textMessage = (TextMessage) message;
        try {
            String messageStr = ((TextMessage) message).getText();
            List<TbItem> items = JSON.parseArray(messageStr, TbItem.class);
            searchService.importList(items);
            System.out.println(">>>>>search_service receive msg: import solr begin" );
        } catch (JMSException e) {
            e.printStackTrace();
        }
    }
}