org.imixs.workflow.engine

Class AsyncEventService

java.lang.Object

org.imixs.workflow.engine.AsyncEventService

@DeclareRoles(value={"org.imixs.ACCESSLEVEL.NOACCESS","org.imixs.ACCESSLEVEL.READERACCESS","org.imixs.ACCESSLEVEL.AUTHORACCESS","org.imixs.ACCESSLEVEL.EDITORACCESS","org.imixs.ACCESSLEVEL.MANAGERACCESS"})
 @RolesAllowed(value={"org.imixs.ACCESSLEVEL.NOACCESS","org.imixs.ACCESSLEVEL.READERACCESS","org.imixs.ACCESSLEVEL.AUTHORACCESS","org.imixs.ACCESSLEVEL.EDITORACCESS","org.imixs.ACCESSLEVEL.MANAGERACCESS"})
public class AsyncEventService
extends Object

The AsyncEventService can be used to process workflow events in an asynchronous batch process. The AsyncEventService lookup eventLog entries of the topic "async.event".

The processor look up the workItem and starts a processing life cycle.

The AsyncEventService is called only by the AsyncEventScheduler which is implementing a ManagedScheduledExecutorService.

To prevent concurrent processes to handle the same workitems the batch process uses a Optimistic lock strategy. After fetching new event log entries the processor updates the eventLog entry in a new transaction and set the topic to 'batch.process.lock'. After that update we can be sure that no other process is dealing with these entries. After completing the processing step the eventlog entry will be removed.

To avoid ad deadlock the processor set an expiration time on the lock, so the lock will be auto-released after 1 minute (batch.processor.deadlock).

Version:

1.0

Author:

rsoika

See Also:

AsyncEventScheduler

Constructor Summary

Constructors

Constructor and Description
AsyncEventService()

Method Summary

Modifier and Type	Method and Description
void	onProcess(ProcessingEvent processingEvent) The observer method verifies if the current task contains a AsyncEvent definition.
void	processEventLog() The method lookups for batch event log entries and processed workitems in a batch process.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AsyncEventService

public AsyncEventService()

Method Detail

onProcess

public void onProcess(@Observes
                      ProcessingEvent processingEvent)
               throws ModelException

The observer method verifies if the current task contains a AsyncEvent definition.

Throws:

ModelException

processEventLog

public void processEventLog()

The method lookups for batch event log entries and processed workitems in a batch process.

Each eventLogEntry is cached in the eventCache. The cache is cleared from all eventLogEntries not part of the current collection. We can assume that the event was succefully processed by the ArchiveHandler

Throws:

ArchiveException