java - 是否有任何 MQ 服务器可以嵌入在 Java 进程中运行？

Question

我正在为我团队的一个应用研究排队解决方案。理想情况下，我们希望既可以配置为轻量级的进程内代理(用于线程之间的低吞吐量消息传递)也可以配置为外部代理。有没有可以做到这一点的 MQ 服务器？大多数似乎需要设置为外部实体。 ZeroMQ 似乎最接近进程内解决方案，但它似乎更像是“类固醇上的 UDP 套接字”，我们需要可靠的交付。

Answer 1

就像我们说的，ActiveMQ 比 ZeroMQ 重一点，但它作为一个嵌入式进程运行得非常好。 这里是一个简单的例子，带有 Spring 和 ActiveMQ。

将用于测试队列的消息监听器:

public class TestMessageListener implements MessageListener {

    private static final Logger logger = LoggerFactory.getLogger(TestMessageListener.class);

    @Override
    public void onMessage(Message message) {

        /* Receive the text message */
        if (message instanceof TextMessage) {

            try {
                String text = ((TextMessage) message).getText();
                System.out.println("Message reception from the JMS queue : " + text);

            } catch (JMSException e) {
                logger.error("Error : " + e.getMessage());
            }

        } else {
            /* Handle non text message */
        }
    }
}

ActiveMQ 上下文配置:

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

    <bean id="jmsQueueConnectionFactory" class="org.apache.activemq.spring.ActiveMQConnectionFactory">
        <property name="brokerURL">
            <value>tcp://localhost:61617</value>
        </property>
    </bean>

    <bean id="pooledJmsQueueConnectionFactory" class="org.apache.activemq.pool.PooledConnectionFactory" destroy-method="stop">
        <constructor-arg ref="jmsQueueConnectionFactory" />
    </bean>

    <bean id="queueDestination" class="org.apache.activemq.command.ActiveMQQueue">
        <constructor-arg value="messageQueue" />
    </bean>

    <bean id="jmsQueueTemplate" class="org.springframework.jms.core.JmsTemplate">
       <constructor-arg ref="pooledJmsQueueConnectionFactory" />
       <property name="pubSubDomain" value="false"/>
    </bean>

    <bean id="testMessageListener" class="com.example.jms.TestMessageListener" />

    <bean id="messageQueuelistenerContainer" class="org.springframework.jms.listener.DefaultMessageListenerContainer">
        <property name="connectionFactory" ref="pooledJmsQueueConnectionFactory" />
        <property name="destination" ref="QueueDestination" />
        <property name="messageListener" ref="testMessageListener" />
        <property name="concurrentConsumers" value="5" />
        <property name="acceptMessagesWhileStopping" value="false" />
        <property name="recoveryInterval" value="10000" />
        <property name="cacheLevelName" value="CACHE_CONSUMER" /> 
    </bean>

</beans>

JUnit 测试:

@ContextConfiguration(locations = {"classpath:/activeMQ-context.xml"})
public class SpringActiveMQTest extends AbstractJUnit4SpringContextTests {

    @Autowired
    private JmsTemplate template;

    @Autowired
    private ActiveMQDestination destination;

    @Test
    public void testJMSFactory() {
        /* sending a message */
        template.convertAndSend(destination, "Hi");

        /* receiving a message */
        Object msg = template.receive(destination);
        if (msg instanceof TextMessage) {
            try {
                System.out.println(((TextMessage) msg).getText());
            } catch (JMSException e) {
                System.out.println("Error : " + e.getMessage());
            }
        }
    }
}

要添加到 pom.xml 的依赖项:

<!-- Spring -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jms</artifactId>
    <version>${org.springframework-version}</version>
</dependency>

<!-- ActiveMQ -->
<dependency>
    <groupId>org.apache.activemq</groupId>
    <artifactId>activemq-all</artifactId>
    <version>5.6.0</version>
    <scope>compile</scope>
</dependency>

<dependency>
    <groupId>org.apache.activemq</groupId>
    <artifactId>activemq-pool</artifactId>
    <version>5.6.0</version>
</dependency>

<dependency>
    <groupId>org.apache.activemq</groupId>
    <artifactId>activemq-core</artifactId>
    <version>5.6.0</version>
</dependency>