我在我的日食中运行优先队列java program,我遇到了问题,第一次得到正确的答案。还有一次,我在队列中增加了一条消息,但这次我得到了不同的结果。RabbitMQ消息优先级队列不工作
public static void main(String[] argv) throws Exception {
ConnectionFactory factory = new ConnectionFactory();
Connection conn = factory.newConnection();
Channel ch = conn.createChannel();
Map<String, Object> args = new HashMap<String, Object>();
args.put("x-max-priority", 10);
ch.queueDeclare(QUEUE_UPDATE, true, false, false, args);
publish(ch, 141);
publish(ch, 250);
final CountDownLatch latch = new CountDownLatch(2);
ch.basicConsume(QUEUE_UPDATE, true, new DefaultConsumer(ch) {
public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body) throws IOException {
System.out.println("Received " + new String(body));
latch.countDown();
}
});
latch.await();
conn.close();
System.out.println("Finished");
}
private static void publish(Channel ch, int priority) throws Exception {
BasicProperties props = MessageProperties.PERSISTENT_BASIC.builder().priority(priority).build();
String body = QUEUE_UPDATE + " message with priority " + priority ;
ch.basicPublish("", QUEUE_UPDATE, props, body.getBytes());
}
正确的输出:
Received update-queue message with priority 250
Received update-queue message with priority 141
Finished
增加了一个队列消息
publish(ch, 141);
publish(ch, 250);
publish(ch, 110); // newly added
预期输出
Received update-queue message with priority 250
Received update-queue message with priority 141
Received update-queue message with priority 110
Finished
实际输出
Received update-queue message with priority 141
Received update-queue message with priority 250
Received update-queue message with priority 110
Finished
这是怎么回事?我做错了什么?
删除队列并尝试使用:'args.put(“x-max-priority”,250);' – Gabriele
对于遇到此问题的C#开发人员,请参阅http://stackoverflow.com/questions/29221020/rabbitmq-3-5-and-message-priority/38999171#38999171。简而言之,“push api”不尊重.Priority。 – granadaCoder