//--- Constructors ---
/// <summary>
/// Create an instance of the work queue.
/// </summary>
/// <param name="handler">Dispatch action for work item Type and with completion callback.</param>
/// <param name="maxParallelism">Maximum number of items being dispatch simultaneously against the dispatch queue.</param>
/// <param name="dispatchQueue">Dispatch queue for work items.</param>
public ProcessingQueue(Action <T, Action> handler, int maxParallelism, IDispatchQueue dispatchQueue)
{
if (dispatchQueue == null)
{
throw new ArgumentNullException("dispatchQueue");
}
if (handler == null)
{
throw new ArgumentNullException("handler");
}
if (maxParallelism <= 0)
{
throw new ArgumentException("maxParallelism must be greater than 0", "maxParallelism");
}
_handler = handler;
_capacity = maxParallelism;
_dispatchQueue = dispatchQueue;
// check if we need an item holding queue
if (maxParallelism < int.MaxValue)
{
_inbox = new LockFreeItemConsumerQueue <T>();
}
}