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package gu.simplemq;

/**
 * 消息订阅者抽象类
 * @author guyadong
 *
 */
public abstract class BaseSubscriber extends ChannelDispatcher implements AutoCloseable  {
	public BaseSubscriber() {
	}
	
	/**
	 * 订阅频道具体实现
	 * @param channels 频道名列表,不可为null或空
	 */
	protected abstract void doSubscribe(String... channels);
	
	/**
	 * 取消订阅具体实现
	 * @param channels 频道名列表,为null或空时订阅所有 {@link #channelSubs}中的频道
	 */
	protected abstract void doUnsubscribe(String... channels);
	

	@Override
	public String[] subscribe(String... channels) {
		channels = super.subscribe(channels);
		if (0 < channels.length){
			this.doSubscribe(channels);
		}
		return channels;
	}
	
	@Override
	public String[] unsubscribe(String... channels){
		channels = super.unsubscribe(channels);
		doUnsubscribe(channels);
		return channels;
	}

	@Override
	public void close() {
		this.unsubscribe();		
	}

}