问题描述
AMQP 函数 consume() 是一个带有回调的阻塞函数，是否可以为 consume() 函数设置超时，这样在特定时间后它不再阻塞并且代码执行完成?
AMQP function consume() is a blocking function with a callback, Is it possible to set a timeout for consume() function, so after specific amount of time it doesn't block anymore and the code execution completes ?
推荐答案
是的，方法如下:
$amqp = new AMQPConnection($your_connection_params);
$amqp->setTimeout($seconds);
那么当你在队列上调用consume()时，如果在超时时间内没有消息到达，consume()会抛出一个AMQPException，消息是资源暂时不可用".如果您曾经中断消费()或遇到超时，请务必在队列对象上调用取消()以正确重置消费者.为此，您需要生成一个全局唯一的消费者标签，并将其作为未记录的第三个参数传入消费:
Then when you call consume() on a queue, if no messages arrive within the timeout period, an AMQPException will be thrown from consume() with the message, "Resource temporarily unavailable". If you ever break out of consume() or hit a timeout, be sure to call cancel() on the queue object to properly reset the consumer. In order to do this, you need to generate a globally unique consumer tag and pass it in as an undocumented, third parameter to consume:
$tag = uniqid() . microtime(true);
$queue->consume($callback, $flags, $tag);
$queue->cancel($tag);
这样，您以后可以再次调用consume()，而不会出现令您头晕目眩的奇怪问题.
That way, you can call consume() again later without weird issues that will make your head spin.
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