private void scheduleTimeout(final ChannelHandlerContext ctx, final ChannelPromise promise) { // Schedule a timeout. final WriteTimeoutTask task = new WriteTimeoutTask(ctx, promise); task.scheduledFuture = ctx.executor().schedule(task, timeoutNanos, TimeUnit.NANOSECONDS); if (!task.scheduledFuture.isDone()) { addWriteTimeoutTask(task); // Cancel the scheduled timeout if the flush promise is complete. promise.addListener(task); } }