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110 lines
3 KiB
C#
110 lines
3 KiB
C#
using System;
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using System.Linq;
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using System.Threading;
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using MediaBrowser.Model.Tasks;
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using Microsoft.Extensions.Logging;
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namespace Emby.Server.Implementations.ScheduledTasks
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{
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/// <summary>
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/// Represents a task trigger that runs repeatedly on an interval.
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/// </summary>
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public class IntervalTrigger : ITaskTrigger
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{
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private DateTime _lastStartDate;
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/// <summary>
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/// Occurs when [triggered].
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/// </summary>
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public event EventHandler<EventArgs> Triggered;
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/// <summary>
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/// Gets or sets the interval.
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/// </summary>
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/// <value>The interval.</value>
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public TimeSpan Interval { get; set; }
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/// <summary>
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/// Gets or sets the options of this task.
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/// </summary>
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public TaskOptions TaskOptions { get; set; }
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/// <summary>
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/// Gets or sets the timer.
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/// </summary>
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/// <value>The timer.</value>
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private Timer Timer { get; set; }
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/// <summary>
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/// Stars waiting for the trigger action.
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/// </summary>
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/// <param name="lastResult">The last result.</param>
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/// <param name="logger">The logger.</param>
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/// <param name="taskName">The name of the task.</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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{
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DisposeTimer();
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DateTime triggerDate;
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if (lastResult == null)
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{
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// Task has never been completed before
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triggerDate = DateTime.UtcNow.AddHours(1);
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}
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else
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{
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triggerDate = new[] { lastResult.EndTimeUtc, _lastStartDate }.Max().Add(Interval);
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}
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if (DateTime.UtcNow > triggerDate)
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{
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triggerDate = DateTime.UtcNow.AddMinutes(1);
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}
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var dueTime = triggerDate - DateTime.UtcNow;
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var maxDueTime = TimeSpan.FromDays(7);
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if (dueTime > maxDueTime)
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{
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dueTime = maxDueTime;
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}
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Timer = new Timer(state => OnTriggered(), null, dueTime, TimeSpan.FromMilliseconds(-1));
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}
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/// <summary>
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/// Stops waiting for the trigger action.
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/// </summary>
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public void Stop()
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{
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DisposeTimer();
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}
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/// <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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}
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}
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/// <summary>
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/// Called when [triggered].
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/// </summary>
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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;
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Triggered(this, EventArgs.Empty);
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}
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}
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}
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}
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