public class JpaProcessPersistenceContext extends org.drools.persistence.jpa.JpaPersistenceContext implements ProcessPersistenceContext
Constructor and Description |
---|
JpaProcessPersistenceContext(javax.persistence.EntityManager em,
boolean useJTA,
boolean locking,
org.drools.persistence.TransactionManager txm) |
JpaProcessPersistenceContext(javax.persistence.EntityManager em,
org.drools.persistence.TransactionManager txm) |
Modifier and Type | Method and Description |
---|---|
ProcessInstanceInfo |
findProcessInstanceInfo(Long processId) |
Long |
getProcessInstanceByCorrelationKey(org.kie.internal.process.CorrelationKey correlationKey)
With regards to locking, the method is not always called during a transaction, which means
that including logic to lock the query will cause exceptions and is not feasible.
|
List<Long> |
getProcessInstancesWaitingForEvent(String type)
This method is used by the
JPASignalManager in order to load ProcessInstance instances
into the ProcessInstanceManager cache so that they can then be signalled. |
CorrelationKeyInfo |
persist(CorrelationKeyInfo correlationKeyInfo) |
ProcessInstanceInfo |
persist(ProcessInstanceInfo processInstanceInfo) |
void |
remove(ProcessInstanceInfo processInstanceInfo) |
close, findSessionInfo, findWorkItemInfo, getEntityManager, isOpen, joinTransaction, lock, lock, merge, persist, persist, remove, remove
public JpaProcessPersistenceContext(javax.persistence.EntityManager em, org.drools.persistence.TransactionManager txm)
public JpaProcessPersistenceContext(javax.persistence.EntityManager em, boolean useJTA, boolean locking, org.drools.persistence.TransactionManager txm)
public ProcessInstanceInfo persist(ProcessInstanceInfo processInstanceInfo)
persist
in interface ProcessPersistenceContext
public ProcessInstanceInfo findProcessInstanceInfo(Long processId)
findProcessInstanceInfo
in interface ProcessPersistenceContext
public void remove(ProcessInstanceInfo processInstanceInfo)
remove
in interface ProcessPersistenceContext
public List<Long> getProcessInstancesWaitingForEvent(String type)
JPASignalManager
in order to load ProcessInstance
instances
into the ProcessInstanceManager
cache so that they can then be signalled.
Unfortunately, with regards to locking, the method is not always called during a transaction, which means
that including logic to lock the query will cause exceptions and is not feasible.
Because the SingleSessionCommandService
design is based around a synchronized execute(...) method,
it's not possible for one thread to create a process instance while another thread simultaneously tries to
signal it. That means that a
phantom read
race condition, that might be caused by a lack of pessimistic locking on this query, isn't possible.
Of course, if you're using multiple ksessions to simultaneoulsy interact with the same process instance,
all bets are off. This however is true for almost everything involving process instances, so that it's not
worth discussing.
getProcessInstancesWaitingForEvent
in interface ProcessPersistenceContext
public CorrelationKeyInfo persist(CorrelationKeyInfo correlationKeyInfo)
persist
in interface ProcessPersistenceContext
public Long getProcessInstanceByCorrelationKey(org.kie.internal.process.CorrelationKey correlationKey)
getProcessInstancesWaitingForEvent(String)
documentation
for more information. The same logic applies to this method.
getProcessInstanceByCorrelationKey
in interface ProcessPersistenceContext
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