RabbitMQ学习之队列监控
对于RabbitMQ的监控,除了服务器基本信息(硬盘、CPU、内存、IO等)以及MQ的进程和端口,我们也可以通过请求url访问管理API监控其集群和队列的情况。在Java api 3.6.0以后,channel接口为我们提供了如下接口:
/**
* Returns the number of messages in a queue ready to be delivered
* to consumers. This method assumes the queue exists. If it doesn't,
* an exception will be closed with an exception.
* @param queue the name of the queue
* @return the number of messages in ready state
* @throws IOException Problem transmitting method.
*/
long messageCount(String queue) throws IOException;
/**
* Returns the number of consumers on a queue.
* This method assumes the queue exists. If it doesn't,
* an exception will be closed with an exception.
* @param queue the name of the queue
* @return the number of consumers
* @throws IOException Problem transmitting method.
*/
long consumerCount(String queue) throws IOException;
messageCount:查询队列未消费的消息数,可以监控消息堆积的情况。
consumerCount:队列的消费者个数,可以对消费者进行监控
Java实例:
public class JavaAPIMonitor {
private static String queue_name = "test_queue";
public static void main(String[] args) throws Exception {
ConnectionFactory factory = new ConnectionFactory();
// amqp://userName:password@hostName:portNumber/virtualHost
factory.setUri("amqp://test:test@10.1.199.169:5672/test");
Connection conn = factory.newConnection();
// System.out.println(conn.getChannelMax());
Channel channel = conn.createChannel();
// System.out.println(channel.getChannelNumber());
System.out.println(channel.messageCount(queue_name));
System.out.println(channel.consumerCount(queue_name));
channel.close();
conn.close();
}
}
运行结果:
277782
3
除此之外,也可以通过连接的状态变化,进行监控,如:连接被阻塞(内存,CPU等不足)
ConnectionFactory factory = new ConnectionFactory();
Connection connection = factory.newConnection();
connection.addBlockedListener(new BlockedListener() {
public void handleUnblocked() throws IOException {
// 连接取消阻塞
}
public void handleBlocked(String reason) throws IOException {
// 连接阻塞
}
});
connection.addShutdownListener(new ShutdownListener() {
public void shutdownCompleted(ShutdownSignalException cause) {
//连接关闭
}
});
先关监控参考文章:
1.RabbitMQ之管理与监控
2.REST API监控RabbitMQ
3.如何监控RabbitMQ
4.使用AMQP模拟检测来确认RabbitMQ是否运行
5.监控队列状态