public interface ChannelFutureListener extends GenericFutureListener<ChannelFuture>
ChannelFuture. The result of the
Channel I/O operation is notified once this listener
is added by calling
GenericFutureListener.operationComplete(Future) is directly called by an I/O
thread. Therefore, performing a time consuming task or a blocking operation
in the handler method can cause an unexpected pause during I/O. If you need
to perform a blocking operation on I/O completion, try to execute the
operation in a different thread using a thread pool.
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