/// <summary>
/// Creates delivery processors to handle orders, based on the number specified
/// when the service was constructed
/// </summary>
private void CreateProcessors()
{
DeliveryProcessor newProcessor;
for (int i = 1; i <= numDeliveryProcessors; i++)
{
newProcessor = new DeliveryProcessor(i);
deliveryProcessors.Add(newProcessor);
}
}
public void CheckOrdersList(object data, EventArgs e)
{
Order currentOrder;
lock (incompleteOrders)
{
// Find all orders that have been processed, and get the lowest order number
// Must get a lock on the object before the min is calculated
currentOrder = incompleteOrders.FirstOrDefault(o => o.currentStatus == Order.Status.Processed);
}
if (currentOrder != null)
{
currentOrder.currentStatus = Order.Status.Delivered;
// Check whether there is an available payment processor.
DeliveryProcessor availableProcessor = null;
availableProcessor = deliveryProcessors.Find(p => p.isAvailable);
if (availableProcessor != null)
{
// Once an available processor is found, then make sure it's unavailable or 'busy' for now
availableProcessor.isAvailable = false;
availableProcessor.ProcessDelivery(currentOrder).Wait();
// Allow the processor to become available again
availableProcessor.isAvailable = true;
// Delivery will always succeed, so remove the order from the queue.
lock (incompleteOrders)
{
incompleteOrders.Remove(currentOrder);
}
// Finally if we have no orders left to process
// set the finish event to release the main thread
if (incompleteOrders.Count == 0)
{
finishedEvent.Set();
}
}
else
{
// else if no available delivery processor, revert the order back to its Processed state
currentOrder.currentStatus = Order.Status.Processed;
}
}
}
