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using MediaBrowser.Common.Kernel;
using MediaBrowser.Model.Logging;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Common.ScheduledTasks.Tasks
{
/// <summary>
/// Deletes old cache files
/// </summary>
public class DeleteCacheFileTask : BaseScheduledTask<IKernel>
{
/// <summary>
/// Initializes a new instance of the <see cref="DeleteCacheFileTask" /> class.
/// </summary>
/// <param name="kernel">The kernel.</param>
/// <param name="taskManager">The task manager.</param>
/// <param name="logger">The logger.</param>
public DeleteCacheFileTask(IKernel kernel, ITaskManager taskManager, ILogger logger)
: base(kernel, taskManager, logger)
{
}
/// <summary>
/// Creates the triggers that define when the task will run
/// </summary>
/// <returns>IEnumerable{BaseTaskTrigger}.</returns>
protected override IEnumerable<BaseTaskTrigger> GetDefaultTriggers()
{
var trigger = new DailyTrigger { TimeOfDay = TimeSpan.FromHours(2) }; //2am
return new[] { trigger };
}
/// <summary>
/// Returns the task to be executed
/// </summary>
/// <param name="cancellationToken">The cancellation token.</param>
/// <param name="progress">The progress.</param>
/// <returns>Task.</returns>
protected override Task ExecuteInternal(CancellationToken cancellationToken, IProgress<double> progress)
{
return Task.Run(() =>
{
var minDateModified = DateTime.UtcNow.AddMonths(-2);
DeleteCacheFilesFromDirectory(cancellationToken, Kernel.ApplicationPaths.CachePath, minDateModified, progress);
});
}
/// <summary>
/// Deletes the cache files from directory with a last write time less than a given date
/// </summary>
/// <param name="cancellationToken">The task cancellation token.</param>
/// <param name="directory">The directory.</param>
/// <param name="minDateModified">The min date modified.</param>
/// <param name="progress">The progress.</param>
private void DeleteCacheFilesFromDirectory(CancellationToken cancellationToken, string directory, DateTime minDateModified, IProgress<double> progress)
{
var filesToDelete = new DirectoryInfo(directory).EnumerateFileSystemInfos("*", SearchOption.AllDirectories)
.Where(f => !f.Attributes.HasFlag(FileAttributes.Directory) && f.LastWriteTimeUtc < minDateModified)
.ToList();
var index = 0;
foreach (var file in filesToDelete)
{
double percent = index;
percent /= filesToDelete.Count;
progress.Report(100 * percent);
cancellationToken.ThrowIfCancellationRequested();
File.Delete(file.FullName);
index++;
}
progress.Report(100);
}
/// <summary>
/// Gets the name of the task
/// </summary>
/// <value>The name.</value>
public override string Name
{
get { return "Cache file cleanup"; }
}
/// <summary>
/// Gets the description.
/// </summary>
/// <value>The description.</value>
public override string Description
{
get { return "Deletes cache files no longer needed by the system"; }
}
/// <summary>
/// Gets the category.
/// </summary>
/// <value>The category.</value>
public override string Category
{
get
{
return "Maintenance";
}
}
}
}
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