public ResponseWorkItem
(
long id,
int externalEntityId,
WorkItemState workItemState,
SubmissionPriority submissionPriority,
byte[] messageBody,
bool assigned,
bool isRetry,
string ownerName,
ContextIdentifier contextIdentifier
)
: base
(
id,
externalEntityId,
workItemState,
submissionPriority,
messageBody,
assigned,
isRetry,
ownerName,
contextIdentifier
)
{
}
public EmsWorkItem
(
decimal id,
int externalEntityId,
WorkItemState workItemState,
SubmissionPriority submissionPriority,
byte[] messageBody,
bool assigned,
bool isRetry,
string ownerName,
ContextIdentifier contextIdentifier,
EmsReaderQueue queue,
Message message
)
: base
(
id,
externalEntityId,
workItemState,
submissionPriority,
messageBody,
assigned,
isRetry,
ownerName,
contextIdentifier
)
{
this.queue = queue;
this.message = message;
}
public PrioritySlotsIndex
(
SubmissionPriority submissionPriority,
int startIndex,
int endIndex
)
{
_submissionPriority = submissionPriority;
StartIndex = startIndex;
EndIndex = endIndex;
}
/// <summary>
///
/// </summary>
/// <param name="priority"></param>
/// <returns>Retrieved work item or null if not found, didn't pass pre-check, etc.</returns>
private WorkItem GetWorkItemFromQueue(SubmissionPriority priority)
{
//TODO: Pay great attention here, now workItemCandidate is an instance field!!! (SD)
workItemCandidate = null;
WorkItem workItem = null;
TextMessage message = null;
Message msgTest = null;
#region Get message from queue
//var transaction = new CommittableTransaction();
try
{
#region Get next job from the queue
//var
//using (DependentTransaction dependentTransaction =
// transaction.DependentClone(DependentCloneOption.BlockCommitUntilComplete))
//{
// using (var scope = new TransactionScope(dependentTransaction))
// {
//TODO: (SD) Provide timeout option
msgTest = queue.ReadNext();
message = msgTest as TextMessage;
// scope.Complete();
//}
//dependentTransaction.Complete();
if (message == null)
{
// if token is equal to null then commit here, as
// consumer will not get to the item anyway.
//if (transaction.TransactionInformation.Status == TransactionStatus.Active)
// transaction.Commit();
Log.TraceData(Log.Source, TraceEventType.Verbose, 10001, "Null message received because of the timeout. Queue: " + queue.ServerConfig.Url + ":" + queue.QueueConfig.Name);
}
else
{
Log.TraceData(Log.Source, TraceEventType.Verbose, 10002, String.Format("Message [CID:{0}|MID:{1}] received from queue {2}:{3}", message.MessageID, message.CorrelationID, queue.ServerConfig.Url,queue.QueueConfig.Name));
}
//}
#endregion
#region If job is not null create a work item for it
if (message != null)
{
//utf-8 is a default encoding for ems
workItemCandidate = new EmsWorkItem(0, 0, WorkItemState.AvailableForProcessing,
SubmissionPriority.Normal, Encoding.UTF8.GetBytes(message.Text), false, false, this.Name,
new ContextIdentifier { InternalId = 0, ExternalReference = message.CorrelationID, ExternalId = message.MessageID, ContextGuid = Trace.CorrelationManager.ActivityId },
queue, message)
{
//Transaction = transaction,
RetrievedAt = DateTime.Now
};
//Trace.CorrelationManager.ActivityId = .ContextUid;
Log.TraceData(Log.Source, TraceEventType.Start, 0, String.Format("{0} [{1}:{2}]", message.CorrelationID, queue.ServerConfig.Url, queue.QueueConfig.Name));
// Set transaction on the work item
}
#endregion
this.FailureExceptionHandler.ResetState();
}
catch (Exception ex)
{
// Cleanup will never throw.
if (ex is EMSException) queue.Close();
try
{
queue.Rollback();
// Rollback the commitable transaction
//transaction.Rollback(ex);
}
finally
{
//transaction.Dispose();
}
Log.TraceData(Log.Source,
TraceEventType.Error,
ProducerMessage.ErrorDuringObtainingTheWorkItem,
new ContextualLogEntry
{
Message =
"Exception happened when trying to get item from the message queue (" +
queue.ServerConfig.Url + "). " + Environment.NewLine + ex,
ContextIdentifier = ((workItemCandidate != null) ? workItemCandidate.ContextIdentifier : new ContextIdentifier())
});
// To review what is the required handling here for us (SD)
if (ExecutionState == ProcessExecutionState.Running)
{
FailureExceptionType type = this.FailureExceptionHandler.HandleFailure(ex);
if (type == FailureExceptionType.NonRecoverable)
this.Stop();
}
else
{
if (workItemCandidate != null)
{
Log.TraceData(Log.Source, System.Diagnostics.TraceEventType.Information,
ProducerMessage.RetrievedMessageReturnedToTheRetrievalQueue,
new ContextualLogEntry
{
Message = string.Format(
"'{0}': Retrieved Recurrence(Id = {1}) Successfully Saved to the {2} queue",
Name,
workItemCandidate.Id,
""
),
ContextIdentifier = workItemCandidate.ContextIdentifier
});
return null;
}
}
}
#endregion Get message from queue
#region Pre-processing checks
// Convert queue message to work item
// In case sql broker no need to do (SD)
if (workItemCandidate != null)
{
#region WorkItem Diagnostics
workItemCandidate.AttachNote("Received from the " + priority + " Queue ");
#endregion WorkItem Diagnostics
// TODO: //**SD1 - Provide the check for
// No checks done now, see the DB driven implementation for the checks samples (SD)
// It means as well that we can simply assign item candidate to be our work item
workItem = workItemCandidate;
// TODO: (SD) Message body will be the xml retrieved from the sql broker
workItem.MessageBody = Encoding.UTF8.GetBytes(message.Text);
//**message.GetObjectProperty
}
#endregion Pre-processing checks
// Return retrieved work item (or null)
return workItem;
}
public PrioritySlotsIndex this[SubmissionPriority priority]
{
get
{
foreach (PrioritySlotsIndex qwi in this)
{
if (qwi.SubmissionPriority == priority)
{
return qwi;
}
}
return null;
}
set
{
for (int i = 0; i < List.Count; i++)
{
if (((PrioritySlotsIndex) List[i]).SubmissionPriority == priority)
{
List[i] = value;
return;
}
}
Add(value);
}
}
protected virtual bool ReservePrioritySlot
(
SubmissionPriority priority
)
{
if (RetrievedItems.Configuration.PrioritySlotCounts[priority].Count == 0)
return false;
int timeout = RetrievedItems.Configuration.PrioritySlotCounts[priority].Timeout;
while (true)
{
lock (RetrievedItems.Counters[priority])
{
#region Instrumenting - to be done via perf (SD)
int i = RetrievedItems.Counters[priority].ItemsPresentCount;
int j = RetrievedItems.Counters[priority].Value;
int k = RetrievedItems.Configuration.PrioritySlotCounts[priority].Count;
//if (Tools.Instrumentation.Common.InstrumentationManager.Level == InstrumentationLevel.Debug)
//{
Log.TraceData(Log.Source,
TraceEventType.Verbose,
20000,
"**" + Name + ": Reserve slot attempt (priority:" + priority +
", items retrieved:" + i + ", requested: " + j +
", slots count: " + k);
#endregion Instrumenting - to be done via perf mon (SD)
if (
i // already present
+ j // requested
<
k // slots count
)
{
// TODO: Introduce the separate counter for that and
// avoid some more locking inside (SD).
RetrievedItems.Counters[priority].SyncIncrement();
#region Instrumenting
Log.TraceData(Log.Source,TraceEventType.Verbose,
20000, "**" + Name + ": Reserve attempt succeeded.");
#endregion Instrumenting
return true;
}
if (!Monitor.Wait
(
RetrievedItems.Counters[priority],
timeout
))
{
#region Instrumenting
Log.TraceData(Log.Source,TraceEventType.Verbose,
20000, "**" + Name + ": Reserve attempt failed after waiting for, ms " + timeout);
#endregion Instrumenting
return false;
}
}
}
}
protected virtual void CancelPrioritySlotReservation(SubmissionPriority priority)
{
lock (RetrievedItems.Counters[priority])
{
// TODO: Introduce the separate counter for that and
// avoid some more locking inside (SD).
#region Instrumenting
//if (Tools.Instrumentation.Common.InstrumentationManager.Level == InstrumentationLevel.Debug)
//{
Log.TraceData(Log.Source,TraceEventType.Verbose,
20000, "**" + Name + ": Cancelling slot reservation");
//}
#endregion Instrumenting
RetrievedItems.Counters[priority].SyncDecrement();
}
}
/// <summary>
///
/// </summary>
/// <param name="priority"></param>
/// <returns>Retrieved work item or null if not found, didn't pass pre-check, etc.</returns>
private WorkItem GetWorkItemFromQueue(SubmissionPriority priority)
{
//TODO: Pay great attention here, now workItemCandidate is an instance field!!! (SD)
workItemCandidate = null;
WorkItem workItem = null;
Tools.Commands.Implementation.IF1.req item = null;
Trace.CorrelationManager.ActivityId = Guid.NewGuid();
#region Get message from queue
var transaction = new CommittableTransaction();
try
{
#region Get next job from the queue
//var
using (DependentTransaction dependentTransaction =
transaction.DependentClone(DependentCloneOption.BlockCommitUntilComplete))
{
using (var scope = new TransactionScope(dependentTransaction))
{
//TODO: (SD) Provide timeout option
item = new Tools.Commands.Implementation.IF1.req
{
reqId = (++IdSequence).ToString(),
processingStatus = "P",
errorDesc = "ok",
returnValue = "ok",
updateMechanism = "JMS"
};
scope.Complete();
}
dependentTransaction.Complete();
if (item == null)
{
// if token is equal to null then commit here, as
// consumer will not get to the item anyway.
if (transaction.TransactionInformation.Status == TransactionStatus.Active)
transaction.Commit();
}
}
#endregion
#region If job is not null create a work item for it
if (item != null)
{
workItemCandidate = new RequestWorkItem(0, 0, WorkItemState.AvailableForProcessing,
SubmissionPriority.Normal, Encoding.UTF8.GetBytes(SerializationUtility.Serialize2String(item)), false, false, this.Name,
new ContextIdentifier { InternalId = 0, ExternalReference = IdSequence.ToString(), ExternalId = IdSequence.ToString() })
{
Transaction = transaction,
RetrievedAt = DateTime.Now
};
//**Trace.CorrelationManager.ActivityId = .ContextUid;
Log.Source.TraceEvent(TraceEventType.Start, 0, "Received the item " + item);
// Set transaction on the work item
}
#endregion
this.FailureExceptionHandler.ResetState();
}
catch (Exception ex)
{
try
{
// Rollback the commitable transaction
transaction.Rollback(ex);
}
finally
{
transaction.Dispose();
}
Log.TraceData(Log.Source,
TraceEventType.Error,
ProducerMessage.ErrorDuringObtainingTheWorkItem,
new ContextualLogEntry
{
Message =
"Exception happened when trying to get item " + Environment.NewLine + ex,
ContextIdentifier = ((workItemCandidate != null) ? workItemCandidate.ContextIdentifier : new ContextIdentifier())
});
// To review what is the required handling here for us (SD)
if (ExecutionState == ProcessExecutionState.Running)
{
FailureExceptionType type = this.FailureExceptionHandler.HandleFailure(ex);
if (type == FailureExceptionType.NonRecoverable)
this.Stop();
}
else
{
if (workItemCandidate != null)
{
Log.TraceData(Log.Source, System.Diagnostics.TraceEventType.Information,
ProducerMessage.RetrievedMessageReturnedToTheRetrievalQueue,
new ContextualLogEntry
{
Message = string.Format(
"'{0}': Retrieved Recurrence(Id = {1}) Successfully Saved to the {2} queue",
Name,
workItemCandidate.Id,
""
),
ContextIdentifier = workItemCandidate.ContextIdentifier
});
return null;
}
}
}
#endregion Get message from queue
#region Pre-processing checks
// Convert queue message to work item
// In case sql broker no need to do (SD)
if (workItemCandidate != null)
{
#region WorkItem Diagnostics
workItemCandidate.AttachNote("Received from the " + priority + " Queue ");
#endregion WorkItem Diagnostics
// TODO: //**SD1 - Provide the check for
// No checks done now, see the DB driven implementation for the checks samples (SD)
// It means as well that we can simply assign item candidate to be our work item
workItem = workItemCandidate;
// TODO: (SD) Message body will be the xml retrieved from the sql broker
//**message.GetObjectProperty
}
#endregion Pre-processing checks
// Return retrieved work item (or null)
return workItem;
}
public static WorkItemSlot Create(SubmissionPriority priority)
{
return new WorkItemSlot(priority);
}
protected WorkItemSlot(SubmissionPriority priority)
{
_submissionPriority = priority;
}
protected WorkItem
(
decimal id,
int externalEntityId,
WorkItemState workItemState,
SubmissionPriority submissionPriority,
byte[] messageBody,
bool assigned,
bool isRetry,
string ownerName,
ContextIdentifier contextIdentifier
)
{
Id = id;
ExternalEntityId = externalEntityId;
_workItemState = workItemState;
_submissionPriority = submissionPriority;
_messageBody = messageBody;
Assigned = assigned;
IsRetry = isRetry;
OwnerName = ownerName;
_contextIdentifier = contextIdentifier;
// _processCode = processCode;
// _assignmentToken = assignmentToken;
}
public PriorityWorkItemsRequestedCounter this[SubmissionPriority priority]
{
get
{
foreach (PriorityWorkItemsRequestedCounter qwi in this)
{
if (qwi.SubmissionPriority == priority)
{
return qwi;
}
}
return null;
}
set
{
for (int i = 0; i < List.Count; i++)
{
if (((PriorityWorkItemsRequestedCounter) List[i]).SubmissionPriority == priority)
{
List[i] = value;
return;
}
}
Add(value);
}
}
public PriorityWorkItemsRequestedCounter(SubmissionPriority submissionPriority)
: this()
{
_submissionPriority = submissionPriority;
}