/// <summary>
/// Complete processing the current media item by updating the media queue instance and
/// reseting the status of the conversion queue.
/// </summary>
/// <param name="settings">An instance of <see cref="MediaConversionSettings" /> containing
/// settings and results used in the conversion. A null value is acceptable.</param>
private void CompleteProcessItem(MediaConversionSettings settings)
{
// Update status and persist to data store
MediaQueueItem mqItem = GetCurrentMediaQueueItem();
mqItem.DateConversionCompleted = DateTime.Now;
if (settings != null && settings.FileCreated)
{
mqItem.Status = MediaQueueItemStatus.Complete;
}
else
{
mqItem.Status = MediaQueueItemStatus.Error;
var fileName = (settings != null && !String.IsNullOrEmpty(settings.FilePathSource) ? Path.GetFileName(settings.FilePathSource) : "<Unknown>");
string msg = String.Format(CultureInfo.CurrentCulture, "Unable to process file '{0}'.", fileName);
RecordEvent(msg, settings);
}
//Factory.GetDataProvider().MediaQueue_Save(mediaQueueDto);
mqItem.Save();
// Update the item in the collection.
//MediaQueueItems[mediaQueueDto.MediaQueueId] = mediaQueueDto;
Reset();
}
/// <summary>
/// Begins processing the current media item, returning <c>true</c> when the action succeeds.
/// Specifically, a few properties are updated and the item is persisted to the data store.
/// If the item cannot be processed (may be null or has a status other than 'Waiting'), this
/// function returns <c>false</c>.
/// </summary>
/// <returns>Returns <c>true</c> when the item has successfully started processing; otherwise
/// <c>false</c>.</returns>
private bool BeginProcessItem()
{
MediaQueueItem mqItem = GetCurrentMediaQueueItem();
if (mqItem == null)
{
return(false);
}
if (!mqItem.Status.Equals(MediaQueueItemStatus.Waiting))
{
ProcessNextItemInQueue(false);
return(false);
}
mqItem.Status = MediaQueueItemStatus.Processing;
mqItem.DateConversionStarted = DateTime.Now;
//Factory.GetDataProvider().MediaQueue_Save(mediaQueueDto);
mqItem.Save();
// Update the item in the collection.
//MediaQueueItems[mediaQueueDto.MediaQueueId] = mediaQueueDto;
return(true);
}
/// <summary>
/// Removes the item from the queue. If the item is currently being processed, the task
/// is cancelled.
/// </summary>
/// <param name="mediaQueueId">The media queue ID.</param>
public void RemoveMediaQueueItem(int mediaQueueId)
{
MediaQueueItem item;
if (MediaQueueItemDictionary.TryGetValue(mediaQueueId, out item))
{
MediaQueueItem currentItem = GetCurrentMediaQueueItem();
if ((currentItem != null) && (currentItem.MediaQueueId == mediaQueueId))
{
CancelTokenSource.Cancel();
if (Task != null)
{
Task.Wait(20000); // Wait up to 20 seconds
}
Instance.Status = MediaQueueStatus.Idle;
}
//Factory.GetDataProvider().MediaQueue_Delete(item);
item.Delete();
MediaQueueItemDictionary.TryRemove(mediaQueueId, out item);
}
}
/// <summary>
/// Processes the next item in the queue. If the instance is already processing items, the
/// action is canceled.
/// </summary>
private void ProcessNextItemInQueue(bool useBackgroundThread)
{
if (Status == MediaQueueStatus.Processing)
{
return;
}
Reset();
MediaQueueItem mqItem = GetNextItemInQueue();
if (mqItem == null)
{
return;
}
// We have an item to process.
Status = MediaQueueStatus.Processing;
_currentMediaQueueItemId = mqItem.MediaQueueId;
CancelTokenSource = new CancellationTokenSource();
if (useBackgroundThread)
{
Task = Task.Factory.StartNew(ProcessItem);
}
else
{
ProcessItem();
}
}
/// <summary>
/// Determines whether the specified media object undergoing the specified <paramref name="conversionType" />
/// is currently being processed by the media queue or is waiting in the queue.
/// </summary>
/// <param name="mediaObjectId">The ID of the media object.</param>
/// <param name="conversionType">Type of the conversion. If the parameter is omitted, then a matching
/// media object having any conversion type will cause the method to return <c>true</c>.</param>
/// <returns>Returns <c>true</c> if the media object is currently being processed by the media queue
/// or is waiting in the queue; otherwise, <c>false</c>.</returns>
public bool IsWaitingInQueueOrProcessing(int mediaObjectId, MediaQueueItemConversionType conversionType = MediaQueueItemConversionType.Unknown)
{
MediaQueueItem item = GetCurrentMediaQueueItem();
if ((item != null) && item.MediaObjectId == mediaObjectId && (item.ConversionType == conversionType || conversionType == MediaQueueItemConversionType.Unknown))
{
return(true);
}
else
{
return(IsWaitingInQueue(mediaObjectId, conversionType));
}
}
/// <summary>
/// Initializes a new instance of the <see cref="MediaConversionQueue"/> class.
/// </summary>
private MediaConversionQueue()
{
//MediaQueueItemDictionary = new ConcurrentDictionary<int, MediaQueueDto>(Factory.GetDataProvider().MediaQueue_GetMediaQueues().ToDictionary(m => m.MediaQueueId));
using (var repo = new MediaQueueRepository())
{
var items = MediaQueueItem.ToMediaQueueItems(repo.GetAll().OrderBy(mq => mq.DateAdded));
MediaQueueItemDictionary = new ConcurrentDictionary <int, MediaQueueItem>(items.ToDictionary(m => m.MediaQueueId));
}
Reset();
Status = MediaQueueStatus.Idle;
}
/// <summary>
/// Converts the <paramref name="item" /> to an instance of <see cref="MediaQueueDto" />.
/// </summary>
/// <param name="item">The item.</param>
/// <returns>An instance of <see cref="MediaQueueDto" />.</returns>
private static MediaQueueDto ToMediaQueueDto(MediaQueueItem item)
{
return(new MediaQueueDto
{
MediaQueueId = item.MediaQueueId,
FKMediaObjectId = item.MediaObjectId,
Status = item.Status.ToString(),
StatusDetail = item.StatusDetail,
ConversionType = item.ConversionType,
RotationAmount = item.RotationAmount,
DateAdded = item.DateAdded,
DateConversionStarted = item.DateConversionStarted,
DateConversionCompleted = item.DateConversionCompleted
});
}
/// <summary>
/// Adds the specified <paramref name="mediaObject" /> to the queue. It will be processed in a first-in, first-out
/// order. If the media object is already waiting in the queue, no action is taken.
/// </summary>
/// <param name="mediaObject">The media object to be processed.</param>
/// <param name="conversionType">Type of the conversion.</param>
public void Add(IGalleryObject mediaObject, MediaQueueItemConversionType conversionType)
{
lock (_sharedLock)
{
var mqItem = new MediaQueueItem
{
MediaQueueId = int.MinValue,
MediaObjectId = mediaObject.Id,
Status = MediaQueueItemStatus.Waiting,
ConversionType = conversionType,
RotationAmount = mediaObject.CalculateNeededRotation(),
StatusDetail = String.Empty,
DateAdded = DateTime.Now,
DateConversionStarted = null,
DateConversionCompleted = null
};
mqItem.Save();
//Factory.GetDataProvider().MediaQueue_Save(mediaQueueDto);
MediaQueueItemDictionary.TryAdd(mqItem.MediaQueueId, mqItem);
}
}
/// <summary>
/// Converts the <paramref name="item" /> to an instance of <see cref="MediaQueueDto" />.
/// </summary>
/// <param name="item">The item.</param>
/// <returns>An instance of <see cref="MediaQueueDto" />.</returns>
private static MediaQueueDto ToMediaQueueDto(MediaQueueItem item)
{
return new MediaQueueDto
{
MediaQueueId = item.MediaQueueId,
FKMediaObjectId = item.MediaObjectId,
Status = item.Status.ToString(),
StatusDetail = item.StatusDetail,
ConversionType = item.ConversionType,
RotationAmount = item.RotationAmount,
DateAdded = item.DateAdded,
DateConversionStarted = item.DateConversionStarted,
DateConversionCompleted = item.DateConversionCompleted
};
}
/// <summary>
/// Update the status of the <paramref name="item" /> to the specified <paramref name="status" />.
/// </summary>
/// <param name="item">The item whose status is to be updated.</param>
/// <param name="status">The status to update the item to.</param>
private static void ChangeStatus(MediaQueueItem item, MediaQueueItemStatus status)
{
item.Status = status;
item.Save();
//Factory.GetDataProvider().MediaQueue_Save(item);
}
/// <summary>
/// Update the status of the <paramref name="item" /> to the specified <paramref name="status" />.
/// </summary>
/// <param name="item">The item whose status is to be updated.</param>
/// <param name="status">The status to update the item to.</param>
private static void ChangeStatus(MediaQueueItem item, MediaQueueItemStatus status)
{
item.Status = status;
item.Save();
//Factory.GetDataProvider().MediaQueue_Save(item);
}
/// <summary>
/// Adds the specified <paramref name="mediaObject" /> to the queue. It will be processed in a first-in, first-out
/// order. If the media object is already waiting in the queue, no action is taken.
/// </summary>
/// <param name="mediaObject">The media object to be processed.</param>
/// <param name="conversionType">Type of the conversion.</param>
public void Add(IGalleryObject mediaObject, MediaQueueItemConversionType conversionType)
{
lock (_sharedLock)
{
var mqItem = new MediaQueueItem
{
MediaQueueId = int.MinValue,
MediaObjectId = mediaObject.Id,
Status = MediaQueueItemStatus.Waiting,
ConversionType = conversionType,
RotationAmount = mediaObject.CalculateNeededRotation(),
StatusDetail = String.Empty,
DateAdded = DateTime.Now,
DateConversionStarted = null,
DateConversionCompleted = null
};
mqItem.Save();
//Factory.GetDataProvider().MediaQueue_Save(mediaQueueDto);
MediaQueueItemDictionary.TryAdd(mqItem.MediaQueueId, mqItem);
}
}
