using System ;
using System.Threading ;
namespace MediaBrowser.Common.ScheduledTasks
{
/// <summary>
/// Represents a task trigger that fires on a weekly basis
/// </summary>
public class WeeklyTrigger : ITaskTrigger
{
/// <summary>
/// Get the time of day to trigger the task to run
/// </summary>
/// <value>The time of day.</value>
public TimeSpan TimeOfDay { get ; set ; }
/// <summary>
/// Gets or sets the day of week.
/// </summary>
/// <value>The day of week.</value>
public DayOfWeek DayOfWeek { get ; set ; }
/// <summary>
/// Gets or sets the timer.
/// </summary>
/// <value>The timer.</value>
private Timer Timer { get ; set ; }
/// <summary>
/// Stars waiting for the trigger action
/// </summary>
/// <param name="isApplicationStartup">if set to <c>true</c> [is application startup].</param>
public void Start ( bool isApplicationStartup )
{
DisposeTimer ( ) ;
var triggerDate = GetNextTriggerDateTime ( ) ;
Timer = new Timer ( state = > OnTriggered ( ) , null , triggerDate - DateTime . Now , TimeSpan . FromMilliseconds ( - 1 ) ) ;
}
/// <summary>
/// Gets the next trigger date time.
/// </summary>
/// <returns>DateTime.</returns>
private DateTime GetNextTriggerDateTime ( )
{
var now = DateTime . Now ;
// If it's on the same day
if ( now . DayOfWeek = = DayOfWeek )
{
// It's either later today, or a week from now
return now . TimeOfDay < TimeOfDay ? now . Date . Add ( TimeOfDay ) : now . Date . AddDays ( 7 ) . Add ( TimeOfDay ) ;
}
var triggerDate = now . Date ;
// Walk the date forward until we get to the trigger day
while ( triggerDate . DayOfWeek ! = DayOfWeek )
{
triggerDate = triggerDate . AddDays ( 1 ) ;
}
// Return the trigger date plus the time offset
return triggerDate . Add ( TimeOfDay ) ;
}
/// <summary>
/// Stops waiting for the trigger action
/// </summary>
public void Stop ( )
{
DisposeTimer ( ) ;
}
/// <summary>
/// Disposes the timer.
/// </summary>
private void DisposeTimer ( )
{
if ( Timer ! = null )
{
Timer . Dispose ( ) ;
}
}
/// <summary>
/// Occurs when [triggered].
/// </summary>
public event EventHandler < EventArgs > Triggered ;
/// <summary>
/// Called when [triggered].
/// </summary>
private void OnTriggered ( )
{
if ( Triggered ! = null )
{
Triggered ( this , EventArgs . Empty ) ;
}
}
}
}