jellyfin/MediaBrowser.Common/ScheduledTasks/IntervalTrigger.cs

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using MediaBrowser.Model.Events;
using MediaBrowser.Model.Tasks;
using System;
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using System.Linq;
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using System.Threading;
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using MediaBrowser.Model.Logging;
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namespace MediaBrowser.Common.ScheduledTasks
{
/// <summary>
/// Represents a task trigger that runs repeatedly on an interval
/// </summary>
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public class IntervalTrigger : ITaskTrigger
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{
/// <summary>
/// Gets or sets the interval.
/// </summary>
/// <value>The interval.</value>
public TimeSpan Interval { get; set; }
/// <summary>
/// Gets or sets the timer.
/// </summary>
/// <value>The timer.</value>
private Timer Timer { get; set; }
/// <summary>
/// Gets the execution properties of this task.
/// </summary>
/// <value>
/// The execution properties of this task.
/// </value>
public TaskExecutionOptions TaskOptions { get; set; }
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private DateTime _lastStartDate;
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/// <summary>
/// Stars waiting for the trigger action
/// </summary>
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/// <param name="lastResult">The last result.</param>
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/// <param name="isApplicationStartup">if set to <c>true</c> [is application startup].</param>
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public void Start(TaskResult lastResult, ILogger logger, string taskName, bool isApplicationStartup)
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{
DisposeTimer();
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DateTime triggerDate;
if (lastResult == null)
{
// Task has never been completed before
triggerDate = DateTime.UtcNow.AddHours(1);
}
else
{
triggerDate = new[] { lastResult.EndTimeUtc, _lastStartDate }.Max().Add(Interval);
}
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if (DateTime.UtcNow > triggerDate)
{
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triggerDate = DateTime.UtcNow.AddMinutes(1);
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}
var dueTime = triggerDate - DateTime.UtcNow;
var maxDueTime = TimeSpan.FromDays(7);
if (dueTime > maxDueTime)
{
dueTime = maxDueTime;
}
Timer = new Timer(state => OnTriggered(), null, dueTime, TimeSpan.FromMilliseconds(-1));
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}
/// <summary>
/// Stops waiting for the trigger action
/// </summary>
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public void Stop()
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{
DisposeTimer();
}
/// <summary>
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/// Disposes the timer.
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/// </summary>
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private void DisposeTimer()
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{
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if (Timer != null)
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{
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Timer.Dispose();
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}
}
/// <summary>
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/// Occurs when [triggered].
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/// </summary>
public event EventHandler<GenericEventArgs<TaskExecutionOptions>> Triggered;
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/// <summary>
/// Called when [triggered].
/// </summary>
private void OnTriggered()
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{
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DisposeTimer();
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if (Triggered != null)
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{
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_lastStartDate = DateTime.UtcNow;
Triggered(this, new GenericEventArgs<TaskExecutionOptions>(TaskOptions));
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}
}
}
}