org.apache.jdo.store
Class StoreManagerImpl

java.lang.Object
  org.apache.jdo.store.StoreManagerImpl

All Implemented Interfaces:

StoreManager

public abstract class StoreManagerImpl
extends java.lang.Object
implements StoreManager

StoreManagerImpl provides a base for fully implementing the StoreManager interface.

Author:

Dave Bristor

Field Summary

protected boolean

optimistic Indicates whether current transaction is optimistic or not.

Constructor Summary

protected

StoreManagerImpl() Default constructor.

Method Summary

void	flush(java.util.Iterator it, PersistenceManagerInternal pm) Flushes all StateManagerInternals in the given Iterator.
QueryResult	newQueryResult(QueryResultHelper qrh) Returns a QueryResult instance which is then returned as the result of Query.execute(...).
protected abstract void	preFlush() Perform any actions required before StateManager's are flushed.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.jdo.store.StoreManager

copyKeyFieldsFromObjectId, createObjectId, delete, fetch, getConnector, getConnector, getExtent, getExternalObjectId, getInternalObjectId, getPCClassForOid, hasActualPCClass, insert, newObjectIdInstance, update, verifyFields

Field Detail

optimistic

protected boolean optimistic

Indicates whether current transaction is optimistic or not. See flush(java.util.Iterator, org.apache.jdo.pm.PersistenceManagerInternal).

Constructor Detail

StoreManagerImpl

protected StoreManagerImpl()

Default constructor.

Method Detail

preFlush

protected abstract void preFlush()

Perform any actions required before StateManager's are flushed.

flush

public void flush(java.util.Iterator it,
                  PersistenceManagerInternal pm)

Flushes all StateManagerInternals in the given Iterator. This will in turn cause invocations of insert, delete, and update on this StoreManager. Update, in particular, must be done after this flush method is invoked, so that the value of optimistic is set correctly.

Specified by:

flush in interface StoreManager

Parameters:

it - Iterator of StateManagerInternal instances to be flushed.

pm - PersistenceManagerInternal on whose behalf instances are being flushed.

See Also:

StoreManager.flush(java.util.Iterator, org.apache.jdo.pm.PersistenceManagerInternal)

newQueryResult

public QueryResult newQueryResult(QueryResultHelper qrh)

Returns a QueryResult instance which is then returned as the result of Query.execute(...). This method allows support for datastore specific query execution strategies, since each StoreManager can have its own implementation of the QueryResult interface.

Specified by:

newQueryResult in interface StoreManager

Parameters:

qrh - the helper providing the query tree, the candidates and the actual parameters.

Returns:

a datastore specific query result instance