架构师成长之路|Redis实现延迟队列的三种方式

延迟队列实现

基于监听key过期实现的延迟队列实现，这里需要继承KeyspaceEventMessageListener类来实现监听redis键过期

public class KeyExpirationEventMessageListener extends KeyspaceEventMessageListener implements
		ApplicationEventPublisherAware {

	private static final Topic KEYEVENT_EXPIRED_TOPIC = new PatternTopic("__keyevent@*__:expired");

	private @Nullable ApplicationEventPublisher publisher;

	/**
	 * Creates new {@link MessageListener} for {@code __keyevent@*__:expired} messages.
	 *
	 * @param listenerContainer must not be {@literal null}.
	 */
	public KeyExpirationEventMessageListener(RedisMessageListenerContainer listenerContainer) {
		super(listenerContainer);
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.redis.listener.KeyspaceEventMessageListener#doRegister(org.springframework.data.redis.listener.RedisMessageListenerContainer)
	 */
	@Override
	protected void doRegister(RedisMessageListenerContainer lis
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