java rabbitmq 暂停、恢复订阅代码示例
时间: 2023-08-11 20:11:04 浏览: 63
以下是使用 Java 和 RabbitMQ 暂停和恢复订阅的示例代码:
```java
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
public class Consumer {
private static final String QUEUE_NAME = "my_queue";
private static Connection connection;
private static Channel channel;
private static boolean isPaused = false;
public static void main(String[] args) throws IOException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
connection = factory.newConnection();
channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
// 创建一个消费者
Consumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
if (!isPaused) {
String message = new String(body, "UTF-8");
System.out.println("Received message: " + message);
}
}
};
// 开始订阅消息
channel.basicConsume(QUEUE_NAME, true, consumer);
// 暂停订阅
pauseSubscription();
// 恢复订阅
resumeSubscription();
}
private static void pauseSubscription() {
isPaused = true;
System.out.println("Paused subscription.");
}
private static void resumeSubscription() {
isPaused = false;
System.out.println("Resumed subscription.");
}
}
```
在这个示例中,我们创建了一个 `Consumer` 类来订阅 RabbitMQ 中的消息。我们使用 `handleDelivery` 方法来处理接收到的消息,如果 `isPaused` 标志为 `true`,则不会处理消息。在 `pauseSubscription` 方法中,我们将 `isPaused` 标志设置为 `true`,以便暂停订阅。在 `resumeSubscription` 方法中,我们将 `isPaused` 标志设置为 `false`,以便恢复订阅。