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

java.lang.Object
  org.apache.ojb.broker.util.sequence.AbstractSequenceManager
      org.apache.ojb.broker.util.sequence.SequenceManagerInMemoryImpl

All Implemented Interfaces:

SequenceManager

public class SequenceManagerInMemoryImpl
extends AbstractSequenceManager

Very fast in memory sequence manager implementation, only the first time an id was requested for a class, the manager query the database for the max id in requested column - all following request were performed in memory.

Limitations:

• do not use in clustered environments
• do not use if other applications generate id's for objects

Implementation configuration properties:

Property Key	Property Values
seq.start	Set the start index of used sequences (e.g. set 100000, id generation starts with 100001). Default start index is 1.
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.
sequenceStart	Deprecated, use property 'seq.start'. Set the start index of used sequences (e.g. set 100000, id generation starts with 100001). Default start index is 1.

Version:

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

Author:

Armin Waibel

See Also:

SequenceManager, SequenceManagerFactory, SequenceManagerHelper

Field Summary

protected static Map

sequencesDBMap

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

GLOBAL_SEQUENCE_NAME, PROPERTY_AUTO_NAMING

Constructor Summary

SequenceManagerInMemoryImpl(PersistenceBroker broker)

Method Summary

protected long	getUniqueLong(FieldDescriptor field) returns a unique long value for field.
protected void	removeSequence(String sequenceName) Remove the sequence for given sequence name.

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

sequencesDBMap

protected static Map sequencesDBMap

Constructor Detail

SequenceManagerInMemoryImpl

public SequenceManagerInMemoryImpl(PersistenceBroker broker)

Method Detail

getUniqueLong

protected long getUniqueLong(FieldDescriptor field)
                      throws SequenceManagerException

Description copied from class: AbstractSequenceManager

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

Specified by:

getUniqueLong in class AbstractSequenceManager

Throws:

SequenceManagerException

removeSequence

protected void removeSequence(String sequenceName)

Remove the sequence for given sequence name.

Parameters:

sequenceName - Name of the sequence to remove.