/// <summary>
/// Returns a pair of the delegate to call the Invoke function and the argument types in its
/// method parameters.
/// </summary>
private static MethodArgumentPair ExtractInvocationInfo(SchedulerTaskWrapper taskThatShouldRun)
{
var type = taskThatShouldRun.Task.GetType();
var method = type.GetMethod("InvokeAsync", BindingFlags.Instance | BindingFlags.Public);
var argumentTypes = method.GetParameters()
.Select(a => a.ParameterType)
.ToArray();
var exp = Expression.GetDelegateType(argumentTypes.Concat(new[] { method.ReturnType }).ToArray());
var invoke = method.CreateDelegate(exp, taskThatShouldRun.Task);
return(new MethodArgumentPair(invoke, argumentTypes));
}
public SchedulerHostedService(IEnumerable <IScheduledTask> scheduledTasks)
{
var referenceTime = DateTime.UtcNow;
foreach (var scheduledTask in scheduledTasks)
{
var task = new SchedulerTaskWrapper
{
Schedule = CrontabSchedule.Parse(scheduledTask.Schedule),
Task = scheduledTask,
NextRunTime = referenceTime
};
task.Increment();
_scheduledTasks.Add(task);
}
}
public SchedulerHostedService(IEnumerable <IScheduledTask> scheduledTasks, TimeSpan?delay = null)
{
_scheduledTasks = new List <SchedulerTaskWrapper>();
var referenceTime = DateTime.UtcNow;
foreach (var scheduledTask in scheduledTasks)
{
var wrapper = new SchedulerTaskWrapper
{
Schedule = CrontabSchedule.Parse(scheduledTask.Schedule),
Task = scheduledTask,
NextRunTime = referenceTime
};
_scheduledTasks.Add(wrapper);
}
_delay = delay ?? TimeSpan.FromMinutes(1);
}
private void InitTasks(IEnumerable <IScheduledTask> tasks)
{
var referenceTime = DateTime.UtcNow;
logger.LogTrace("Scheduling Tasks: {referenceTime}", referenceTime);
foreach (var task in tasks)
{
var schedule = CrontabSchedule.Parse(task.Schedule);
var schedulerTaskWrapper = new SchedulerTaskWrapper
{
Schedule = schedule,
Task = task,
NextRunTime = schedule.GetNextOccurrence(referenceTime)
};
logger.LogTrace("Task Scheduled: {taskDescription}, Schedule: {schedule}, NextRun: {nextRunTime}",
task.Description, schedule.ToString(), schedulerTaskWrapper.NextRunTime);
scheduledTasks.Add(schedulerTaskWrapper);
}
}