private async Task <List <TimeSpan> > Execute()
{
List <TimeSpan> nextExecuteDelays = new List <TimeSpan>(); //记录每个任务的下次执行时间，取最小的等待
if (_taskExecutor.GetTaskCount() > _options.Backlog)
{
_logger.LogWarning($"Aix.ScheduleTask定时任务积压太多超过{_options.Backlog}条定时任务待处理");
await Task.Delay(TimeSpan.FromSeconds(5));
return(nextExecuteDelays);
}
var now = DateTimeUtils.GetTimeStamp();
var taskList = await _aixScheduleTaskRepository.QueryAllEnabled(PreReadSecond * 1000 + now); //拉取即将到期的任务 提前{PreReadSecond}秒
//逐个处理
foreach (var task in taskList)
{
_scheduleTaskLifetime.ScheduleTaskStopping.ThrowIfCancellationRequested();
var Schedule = CrontabHelper.ParseCron(_logger, task);
if (task.LastExecuteTime == 0)
{
task.LastExecuteTime = now; //任务第一次执行时，从当前时间开始
}
var nextExecuteTimeSpan = CrontabHelper.GetNextDueTime(Schedule, DateTimeUtils.TimeStampToDateTime(task.LastExecuteTime), DateTimeUtils.TimeStampToDateTime(now));
if (nextExecuteTimeSpan <= TimeSpan.Zero) //时间到了，开始执行任务
{
if (nextExecuteTimeSpan >= TimeSpan.FromSeconds(0 - PreReadSecond)) //排除过期太久的，（服务停了好久，再启动这些就不执行了）
{
await _scheduleTaskExecutor.Trigger(task, TimeSpan.Zero); //
}
now = DateTimeUtils.GetTimeStamp();
task.LastExecuteTime = now;
//计算下一次执行时间
nextExecuteTimeSpan = CrontabHelper.GetNextDueTime(Schedule, DateTimeUtils.TimeStampToDateTime(task.LastExecuteTime), DateTimeUtils.TimeStampToDateTime(now));
task.NextExecuteTime = now + (long)nextExecuteTimeSpan.TotalMilliseconds;
task.ModifyTime = DateTime.Now;
await _aixScheduleTaskRepository.UpdateAsync(task);
}
if (task.NextExecuteTime == 0) //只有第一次且未执行时更新下即可
{
task.NextExecuteTime = now + (long)nextExecuteTimeSpan.TotalMilliseconds;
task.ModifyTime = DateTime.Now;
await _aixScheduleTaskRepository.UpdateAsync(task);
}
nextExecuteDelays.Add(nextExecuteTimeSpan);
}
return(nextExecuteDelays);
}
public async Task Execute(BackgroundProcessContext context)
{
if (_taskExecutor.GetTaskCount() > _options.TaskExecutorMaxTaskCount) //队列任务积压超过1000就不要再拉取了，不然也处理不过来
{
await TaskEx.DelayNoException(TimeSpan.FromMilliseconds(_options.ConsumePullIntervalMillisecond), context.CancellationToken);
return;
}
//// >：读取未分配给其他消费者的消息(未被拉去的) 0-0或id： 读取pending 中的消息
var list = await _database.StreamReadGroupAsync(_topic, _groupName, _consumerName, ">", BatchCount);
if (list.Length == 0)
{
await TaskEx.DelayNoException(TimeSpan.FromMilliseconds(_options.ConsumePullIntervalMillisecond), context.CancellationToken);
return;
}
await ProcessList(list, true);
}