org.datanucleus.flush

Class FlushNonReferential

java.lang.Object

org.datanucleus.flush.FlushNonReferential

All Implemented Interfaces:

FlushProcess

public class FlushNonReferential
extends Object
implements FlushProcess

Flush method for cases where the datastore doesn't use referential integrity so we can send batches of deletes, then batches of inserts, then any updates to optimise the persistence. This also makes use of the OperationQueue to do more intelligent handling of cascade delete when elements are removed from Collections, checking if it is later added to a different collection.

Constructor Summary

Constructors

Constructor and Description
FlushNonReferential()

Method Summary

Modifier and Type	Method and Description
List<NucleusOptimisticException>	execute(ExecutionContext ec, Collection<ObjectProvider> primaryOPs, Collection<ObjectProvider> secondaryOPs, OperationQueue opQueue) Execute the flush.
List<NucleusOptimisticException>	flushDeleteInsertUpdateGrouped(Set<ObjectProvider> opsToFlush, ExecutionContext ec) Method that does the flushing of the passed ObjectProviders, grouping them into all DELETEs, then all INSERTs, finally all UPDATEs.

Methods inherited from class java.lang.Object

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

Constructor Detail

FlushNonReferential

public FlushNonReferential()

Method Detail

execute

public List<NucleusOptimisticException> execute(ExecutionContext ec,
                                                Collection<ObjectProvider> primaryOPs,
                                                Collection<ObjectProvider> secondaryOPs,
                                                OperationQueue opQueue)

Description copied from interface: FlushProcess

Execute the flush.

Specified by:

execute in interface FlushProcess

Parameters:

ec - ExecutionContext

primaryOPs - ObjectProviders that were made dirty by direct API calls. Cleared during this method

secondaryOPs - ObjectProviders that were made dirty by reachability. Cleared during this method

opQueue - Queue of operations

Returns:

Any optimistic exceptions during the deletes/inserts/updates

flushDeleteInsertUpdateGrouped

public List<NucleusOptimisticException> flushDeleteInsertUpdateGrouped(Set<ObjectProvider> opsToFlush,
                                                                       ExecutionContext ec)

Method that does the flushing of the passed ObjectProviders, grouping them into all DELETEs, then all INSERTs, finally all UPDATEs. The StorePersistenceHandler will get calls to deleteObjects, insertObjects and updateObject (for each other one). Note that this is in a separate method to allow calls by other FlushProcesses that want to take advantage of the basic flush method without

Parameters:

opsToFlush - The ObjectProviders to process

ec - ExecutionContext

Returns:

Any optimistic verification exceptions thrown during flush