RabbitMQ學習之隊列監控

對於RabbitMQ的監控，除了服務器基本信息（硬盤、CPU、內存、IO等）以及MQ的進程和端口，我們也可以通過請求url訪問管理API監控其集羣和隊列的情況。在java api 3.6.0以後，channel接口爲我們提供瞭如下接口：

/**
 * 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：查詢隊列未消費的消息數，可以監控消息堆積的情況。
consumerCount：隊列的消費者個數，可以對消費者進行監控
java實例：

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:[email protected]: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();
    }
}
運行結果：
277782
3

除此之外，也可以通過連接的狀態變化，進行監控，如：連接被阻塞（內存，CPU等不足）

ConnectionFactory factory = new ConnectionFactory();
        Connection connection = factory.newConnection();
        connection.addBlockedListener(new BlockedListener() {

            public void handleUnblocked() throws IOException {
                // 連接取消阻塞
            }
            public void handleBlocked(String reason) throws IOException {
                // 連接阻塞
            }
        });
        connection.addShutdownListener(new ShutdownListener() {
            public void shutdownCompleted(ShutdownSignalException cause) {
                //連接關閉
            }
        });

先關監控參考文章：
1.RabbitMQ之管理與監控
2.REST API監控RabbitMQ
3.如何監控RabbitMQ
4.使用AMQP模擬檢測來確認RabbitMQ是否運行
5.監控隊列狀態