protected void ProcessQueuedItem()
{
var key = Guid.Empty;
IQueueItem itemToReduce = null;
if (!ReductionRepository.HasLoadedSavedEntries)
{
return;
}
try
{
queueLock.EnterWriteLock();
try
{
if (Queue.Count > 0)
{
itemToReduce = Queue.Dequeue();
}
}
finally
{
queueLock.ExitWriteLock();
}
if (itemToReduce != null &&
ReductionRepository.FindReduction(itemToReduce.Urls) == null)
{
ItemBeingProcessed = itemToReduce;
key = Hasher.Hash(itemToReduce.Urls);
RRTracer.Trace("dequeued and processing {0} with key {1}.", itemToReduce.Urls, key);
string url = Store.GetUrlByKey(key, itemToReduce.ResourceType);
if (url != null)
{
RRTracer.Trace("found url {0} in store for key {1}", url, key);
ReductionRepository.AddReduction(key, url);
}
else
{
if (DictionaryOfFailures.ContainsKey(key) &&
DictionaryOfFailures[key].Count >= FailureThreshold)
{
RRTracer.Trace("{0} has exceeded its failure threshold and will not be processed.",
itemToReduce.Urls);
return;
}
IReducer reducer = RRContainer
.Current
.GetAllInstances <IReducer>()
.SingleOrDefault(x => x.SupportedResourceType == itemToReduce.ResourceType);
if (reducer == null)
{
RRTracer.Trace(string.Format("Failed to retrieve an RRContainer for {0}.",
itemToReduce.ResourceType));
return;
}
reducer.Process(key, itemToReduce.Urls, itemToReduce.Host);
}
RRTracer.Trace("dequeued and processed {0}.", itemToReduce.Urls);
}
}
catch (Exception e)
{
string message = string.Format("There were errors reducing {0}",
itemToReduce != null ? itemToReduce.Urls : "");
var wrappedException = new ApplicationException(message, e);
RRTracer.Trace(message);
RRTracer.Trace(e.ToString());
AddFailure(key, wrappedException);
if (Registry.CaptureErrorAction != null)
{
Registry.CaptureErrorAction(wrappedException);
}
}
finally
{
ItemBeingProcessed = null;
}
}