以编程方式配置Apache ActiveMQ

问题描述:

我使用Apache ActiveMQ对大量消息进行排队,然后在一天结束时将它们出列。不过,我对ActiveMQ的运作方式感到困惑。在我的PC上,我没有安装ActiveMQ作为服务,也没有在某处安装服务器。我刚才包括“ActiveMQ的 - 全5.14.5.jar”作为我的项目Maven的依赖,我使用下面的代码至今:以编程方式配置Apache ActiveMQ

public static void main(String[] args) throws URISyntaxException, Exception { 
    BrokerService broker = BrokerFactory.createBroker(new URI("broker:(tcp://localhost:4848)")); 
    broker.start(); 
    Connection connection = null; 
    try { 
     // Producer 
     ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://localhost:4848"); 
     connection = connectionFactory.createConnection(); 
     Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); 
     Queue queue = session.createQueue("customerQueue"); 
     String payload = "Important Task"; 
     Message msg = session.createTextMessage(payload); 
     MessageProducer producer = session.createProducer(queue); 
     System.out.println("Sending text '" + payload + "'"); 
     msg.setLongProperty("_AMQ_SCHED_DELIVERY", System.currentTimeMillis() + 5000L); 
     producer.send(msg); 

     // Consumer 
     MessageConsumer consumer = session.createConsumer(queue); 
     connection.start(); 
     QueueBrowser browser = session.createBrowser(queue); 
     while (browser.getEnumeration().hasMoreElements()) { 
      TextMessage textMsg = (TextMessage) consumer.receive(); 
      browser.getEnumeration().nextElement(); 
      System.out.println(textMsg); 
      System.out.println("Received: " + textMsg.getText()); 
     } 

     session.close(); 
    } finally { 
     if (connection != null) { 
      connection.close(); 
     } 
     broker.stop(); 
    } 
} 

正如你所看到的,我不想耽误一消息5秒(或更多,可能会有所不同),但在我找到的每个指南中,我都会指示配置XML配置文件。但是,这是在您将ActiveMQ作为服务运行时使用的文件。我目前雇用只是罐库

最初,我已经安装了Glassgfish服务器,以便使用JMS来排队所有消息,但自那之后我放弃了该项目,但IP仍在使用ActiveMQ(localhost:4848)。

请注意,以下是一个非常有效的示例-KahaDB也用于在发生服务器故障时存储消息。

就我而言,ActiveMQ确实从STS启动本地服务器,我正在运行此代码,但配置文件在哪里?我可以通过编程方式更改其属性

+0

你尝试像'broker.setSchedulerSupport(真)'? (请参阅http://activemq.apache.org/maven/5.11.0/apidocs/org/apache/activemq/broker/BrokerService.html#setSchedulerSupport(boolean)) – Tome

+0

我刚刚做了,它不起作用。 – Lefteris008

+0

你确定你使用的_AMQ_SCHED_DELIVERY属性? ActiveMQ属性应该是'AMQ_SCHEDULED_DELAY'(请参阅http://activemq.apache.org/delay-and-schedule-message-delivery.html) – Tome

这应该工作(适用于我们与ActiveMQ 5.12.3)。请务必先清理您的KahaDB商店,以避免先前的消息被读取。

public static void main(String[] args) throws Exception { 
    BrokerService broker = BrokerFactory.createBroker(new URI("broker:(tcp://localhost:4848)")); 
    broker.setSchedulerSupport(true); 
    broker.start(); 
    Connection connection = null; 
    try { 
     // Producer 
     ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://localhost:4848"); 
     connection = connectionFactory.createConnection(); 
     Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); 
     Queue queue = session.createQueue("customerQueue"); 
     String payload = "Important Task"; 
     Message msg = session.createTextMessage(payload); 
     MessageProducer producer = session.createProducer(queue); 
     System.out.println("Sending text '" + payload + "'"); 
     msg.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, 5000L); 
     producer.send(msg); 
     connection.start(); 

     // Consumer 
     MessageConsumer consumer = null; 
     consumer = session.createConsumer(queue); 

     QueueBrowser browser = session.createBrowser(queue); 
     while (browser.getEnumeration().hasMoreElements()) { 
      TextMessage textMsg = (TextMessage) consumer.receive(); 
      browser.getEnumeration().nextElement(); 
      System.out.println(textMsg); 
      System.out.println("Received: " + textMsg.getText()); 
     } 

     session.close(); 
    } finally{ 
     if (connection != null) { 
      connection.close(); 
     } 
     broker.stop(); 
    } 
} 

第一清洁运行(与空KahaDB店)不应输出

“收稿日期:重要任务”

,而第二个会,如果你不删除中间的数据文件。

卸下线`

msg.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY,5000L);

将使第一清洁运行输出“接收:重要任务”

+0

删除'KahaDB'解决了这个问题。谢谢! – Lefteris008