org.apache.ojb.broker.util.sequence
Class SequenceManagerSeqHiLoImpl

java.lang.Object
  org.apache.ojb.broker.util.sequence.AbstractSequenceManager
      org.apache.ojb.broker.util.sequence.SequenceManagerNextValImpl
          org.apache.ojb.broker.util.sequence.SequenceManagerSeqHiLoImpl

All Implemented Interfaces:

SequenceManager

public class SequenceManagerSeqHiLoImpl
extends SequenceManagerNextValImpl

A High/Low database sequence based implementation. See SequenceManagerNextValImpl for more information.

Implementation configuration properties:

Property Key	Property Values
grabSize	Integer entry determines the number of IDs allocated within the H/L sequence manager implementation. Default was '20'.
autoNaming	Default was 'true'. If set 'true' OJB try to build a sequence name automatic if none found in field-descriptor and set this generated name as sequence-name in field-descriptor. If set 'false' OJB throws an exception if none sequence name was found in field-descriptor.

Limitations:

• do not use when other applications use the database based sequence ditto

Version:

$Id: SequenceManagerSeqHiLoImpl.java,v 1.1 2007-08-24 22:17:29 ewestfal Exp $

Author:

Armin Waibel

Field Summary

protected int	grabSize
static String	PROPERTY_GRAB_SIZE

Fields inherited from class org.apache.ojb.broker.util.sequence.AbstractSequenceManager

GLOBAL_SEQUENCE_NAME, PROPERTY_AUTO_NAMING

Constructor Summary

SequenceManagerSeqHiLoImpl(PersistenceBroker broker)

Method Summary

protected long

getUniqueLong(FieldDescriptor field) returns a unique long value for class clazz and field fieldName.

Methods inherited from class org.apache.ojb.broker.util.sequence.SequenceManagerNextValImpl

buildNextSequence, createSequence, getUniqueId

Methods inherited from class org.apache.ojb.broker.util.sequence.AbstractSequenceManager

afterStore, calculateSequenceName, getBrokerForClass, getConfigurationProperties, getConfigurationProperty, getPlatform, getUniqueValue, setConfigurationProperties, setConfigurationProperty, setReferenceFKs, useAutoNaming

Methods inherited from class java.lang.Object

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

Field Detail

PROPERTY_GRAB_SIZE

public static final String PROPERTY_GRAB_SIZE

See Also:

Constant Field Values

grabSize

protected int grabSize

Constructor Detail

SequenceManagerSeqHiLoImpl

public SequenceManagerSeqHiLoImpl(PersistenceBroker broker)

Method Detail

getUniqueLong

protected long getUniqueLong(FieldDescriptor field)
                      throws SequenceManagerException

Description copied from class: SequenceManagerNextValImpl

returns a unique long value for class clazz and field fieldName. the returned number is unique accross all tables in the extent of clazz.

Overrides:

getUniqueLong in class SequenceManagerNextValImpl

Throws:

SequenceManagerException