/// <summary>
/// Called by the base to initialize the processor.
/// </summary>
public virtual bool Initialize(WorkItemStatusProxy proxy)
{
Proxy = proxy;
if (proxy.Progress == null)
{
proxy.Progress = new TProgress();
}
else if (!(proxy.Progress is TProgress))
{
proxy.Progress = new TProgress();
}
if (Request == null)
{
throw new ApplicationException(SR.InternalError);
}
if (!string.IsNullOrEmpty(proxy.Item.StudyInstanceUid))
{
Location = new StudyLocation(proxy.Item.StudyInstanceUid);
}
return(true);
}
/// <summary>
/// The actual delegate
/// </summary>
/// <param name="processor"></param>
/// <param name="queueItem"></param>
private void ExecuteProcessor(IWorkItemProcessor processor, WorkItem queueItem)
{
var proxy = new WorkItemStatusProxy(queueItem);
try
{
Platform.Log(proxy.LogLevel, "Starting processing of {0} WorkItem for OID {1}", queueItem.Type, queueItem.Oid);
if (proxy.Item.Status == WorkItemStatusEnum.Deleted || proxy.Item.Status == WorkItemStatusEnum.DeleteInProgress)
{
if (!processor.Initialize(proxy))
{
Platform.Log(LogLevel.Error, "Unable to intialize WorkItem processor for: {0}. Directly deleting.", proxy.Request.ActivityTypeString);
proxy.Delete();
return;
}
// Delete the entry
processor.Delete();
return;
}
if (!processor.Initialize(proxy))
{
proxy.Postpone();
return;
}
processor.Process();
}
catch (NotEnoughStorageException e)
{
// No space. Can fail right way.
Platform.Log(LogLevel.Error, "Not enough storage space when processing WorkQueue item of type {0}. Failing Queue item. (Oid: {1})", queueItem.Type, queueItem.Oid);
proxy.Fail(SR.ExceptionNotEnoughStorage, WorkItemFailureType.Fatal);
}
catch (Exception e)
{
Platform.Log(LogLevel.Error, e,
"Unexpected exception when processing WorkQueue item of type {0}. Failing Queue item. (Oid: {1})",
queueItem.Type,
queueItem.Oid);
String error = e.InnerException != null ? e.InnerException.Message : e.Message;
proxy.Fail(error, WorkItemFailureType.NonFatal);
}
finally
{
// Signal the parent thread, so it can query again
_threadStop.Set();
// Cleanup the processor
processor.Dispose();
Platform.Log(proxy.LogLevel, "Done processing of {0} WorkItem for OID {1} and status {2}", proxy.Item.Type, proxy.Item.Oid, proxy.Item.Status);
}
}
private void QueueWorkItems(IEnumerable<WorkItem> list )
{
try
{
foreach (var item in list)
{
if (!_extensions.ContainsKey(item.Request.WorkItemType))
{
Platform.Log(LogLevel.Error,
"No extensions loaded for WorkItem item type: {0}. Failing item.",
item.Type);
//Just fail the WorkQueue item, not much else we can do
var proxy = new WorkItemStatusProxy(item);
proxy.Fail("No plugin to handle WorkItem type: " + item.Type, WorkItemFailureType.Fatal);
continue;
}
try
{
IWorkItemProcessorFactory factory = _extensions[item.Request.WorkItemType];
IWorkItemProcessor processor = factory.GetItemProcessor();
// Enqueue the actual processing of the item to the thread pool.
_threadPool.Enqueue(processor, item, ExecuteProcessor);
}
catch (Exception e)
{
Platform.Log(LogLevel.Error, e, "Unexpected exception creating WorkItem processor.");
var proxy = new WorkItemStatusProxy(item);
proxy.Fail("No plugin to handle WorkItem type: " + item.Type, WorkItemFailureType.Fatal);
}
}
}
catch (Exception e)
{
// Wait for only 3 seconds
Platform.Log(LogLevel.Error, e, "Exception occured when processing WorkItem item.");
_threadStop.WaitOne(3000, false);
}
}