public interface ChannelGroupFutureListener extends GenericFutureListener<ChannelGroupFuture>
ChannelGroupFuture的结果。
一旦通过调用ChannelGroupFuture.addListener(GenericFutureListener)添加了此侦听器并且所有I / O操作完成，就会通知异步ChannelGroup I / O操作的结果。
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