/// <summary>Adds a new item to process to the end of the queue.</summary>
/// <param name="action">The action to process.</param>
/// <returns>A handle to the item within the queue.</returns>
public ProcessQueueHandle Add(Action action)
{
// Setup initial conditions.
if (action == null) throw new ArgumentNullException("action");
// Create the handle and store ite.
var handle = new ProcessQueueHandle(this, action, OnProcessing, OnProcessed);
lock (queue)
{
queue.Enqueue(handle);
}
// Finish up.
return handle;
}
/// <summary>Removes the given handle from the queue.</summary>
/// <param name="handle">The handle to remove.</param>
public void Remove(ProcessQueueHandle handle)
{
if (handle == null) return;
lock (queue)
{
var list = queue.ToList();
list.Remove(handle);
queue.Clear();
foreach (var item in list)
{
queue.Enqueue(item);
}
}
}
/// <summary>Determines whether the specified handle is contained within the queue.</summary>
/// <param name="handle">The handle to look for.</param>
public bool Contains(ProcessQueueHandle handle)
{
return queue.Contains(handle);
}
/// <summary>Gets the position of a handle within the queue.</summary>
/// <param name="handle">The handle to examine.</param>
/// <returns>The position within the queue, descending (0 is next to be processed, -1 means already processed or not part of this queue).</returns>
public int GetPosition(ProcessQueueHandle handle)
{
if (handle == null) return -1;
return queue.ToList().IndexOf(handle);
}
public ProcessQueueEventArgs(ProcessQueueHandle handle)
{
Handle = handle;
}
