2.1.5Channel的关闭prepareToClose方法返回的closeExecutor是用来执行Channel关闭操作的,当我们开启了SOLINGER选项时,closeExecutorGlobalEventExecutor.INSTANCE,避免了Reactor线程的阻塞。由GlobalEventExecutor负责执行doClose0方法关闭Channel底层的Socket,并通知closeFuture关闭结果。privatevoidclose(finalChannelPromisepromise,finalThrowablecause,finalClosedChannelExceptioncloseCause,finalbooleannotify){.....