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123 lines
3.7 KiB
C#
123 lines
3.7 KiB
C#
using System;
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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.Triggers
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{
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/// <summary>
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/// Represents a task trigger that fires on a weekly basis.
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/// </summary>
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public sealed class WeeklyTrigger : ITaskTrigger, IDisposable
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{
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private readonly TimeSpan _timeOfDay;
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private readonly DayOfWeek _dayOfWeek;
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private Timer? _timer;
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private bool _disposed = false;
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/// <summary>
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/// Initializes a new instance of the <see cref="WeeklyTrigger"/> class.
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/// </summary>
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/// <param name="timeofDay">The time of day to trigger the task to run.</param>
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/// <param name="dayOfWeek">The day of week.</param>
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/// <param name="taskOptions">The options of this task.</param>
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public WeeklyTrigger(TimeSpan timeofDay, DayOfWeek dayOfWeek, TaskOptions taskOptions)
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{
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_timeOfDay = timeofDay;
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_dayOfWeek = dayOfWeek;
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TaskOptions = taskOptions;
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}
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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 the options of this task.
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/// </summary>
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public TaskOptions TaskOptions { get; }
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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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var triggerDate = GetNextTriggerDateTime();
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_timer = new Timer(_ => OnTriggered(), null, triggerDate - DateTime.Now, TimeSpan.FromMilliseconds(-1));
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}
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/// <summary>
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/// Gets the next trigger date time.
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/// </summary>
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/// <returns>DateTime.</returns>
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private DateTime GetNextTriggerDateTime()
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{
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var now = DateTime.Now;
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// If it's on the same day
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if (now.DayOfWeek == _dayOfWeek)
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{
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// It's either later today, or a week from now
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return now.TimeOfDay < _timeOfDay ? now.Date.Add(_timeOfDay) : now.Date.AddDays(7).Add(_timeOfDay);
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}
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var triggerDate = now.Date;
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// Walk the date forward until we get to the trigger day
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while (triggerDate.DayOfWeek != _dayOfWeek)
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{
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triggerDate = triggerDate.AddDays(1);
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}
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// Return the trigger date plus the time offset
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return triggerDate.Add(_timeOfDay);
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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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_timer?.Dispose();
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_timer = null;
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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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Triggered?.Invoke(this, EventArgs.Empty);
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}
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/// <inheritdoc />
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public void Dispose()
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{
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if (_disposed)
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{
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return;
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}
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DisposeTimer();
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_disposed = true;
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}
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}
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}
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