Home / cs-notes / Architecture / Components / Netty / EventLoop / AbstractScheduledEventExecutor / schedule

    @Override
    public ScheduledFuture<?> schedule(Runnable command, long delay, TimeUnit unit) {
        ObjectUtil.checkNotNull(command, "command");
        ObjectUtil.checkNotNull(unit, "unit");
        if (delay < 0) {
            delay = 0;
        }
        validateScheduled0(delay, unit);

        return schedule(new ScheduledFutureTask<Void>(
                this,
                command,
                deadlineNanos(unit.toNanos(delay))));
    }

    private <V> ScheduledFuture<V> schedule(final ScheduledFutureTask<V> task) {
        if (inEventLoop()) {
            scheduleFromEventLoop(task);
        } else {
            final long deadlineNanos = task.deadlineNanos();
            // task will add itself to scheduled task queue when run if not expired
            if (beforeScheduledTaskSubmitted(deadlineNanos)) {
                execute(task);
            } else {
                lazyExecute(task);
                // Second hook after scheduling to facilitate race-avoidance
                if (afterScheduledTaskSubmitted(deadlineNanos)) {
                    execute(WAKEUP_TASK);
                }
            }
        }

        return task;
    }