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

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

All Implemented Interfaces:

SequenceManager

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public class SequenceManagerHighLowImpl

extends AbstractSequenceManager

High/Low sequence manager implementation generates unique and continuous id's (during runtime) by using sequences to avoid database access.

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'.
globalSequenceId	If set 'true' implementation use global unique id's for all fields. This modus is NOT extent aware! Default was 'false'.

Version:

$Id: SequenceManagerHighLowImpl.java,v 1.14 2003/01/12 10:03:32 arminw Exp $

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Field Summary
protected  int	grabSize
private  org.apache.ojb.broker.util.logging.Logger	log
static java.lang.String	PROPERTY_GLOBAL_SEQUENCE_ID
static java.lang.String	PROPERTY_GRAB_SIZE
private static java.util.Map	sequencesMap
protected  boolean	useGlobalSequenceIdentities

 

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

 

Constructor Summary

SequenceManagerHighLowImpl(org.apache.ojb.broker.PersistenceBroker broker)

 

Method Summary
int	getUniqueId(org.apache.ojb.broker.metadata.FieldDescriptor field)           Gets a new uniqueId for the given Class and fieldname

 

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

afterStore, getBrokerForClass, getConfigurationProperties, getConfigurationProperty, getPlatform, getUniqueLong, getUniqueObject, getUniqueString, setConfigurationProperties, setConfigurationProperty, setReferenceFKs

 

Methods inherited from class java.lang.Object

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

 

Field Detail

log

private org.apache.ojb.broker.util.logging.Logger log

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PROPERTY_GRAB_SIZE

public static final java.lang.String PROPERTY_GRAB_SIZE

See Also:

Constant Field Values

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PROPERTY_GLOBAL_SEQUENCE_ID

public static final java.lang.String PROPERTY_GLOBAL_SEQUENCE_ID

See Also:

Constant Field Values

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sequencesMap

private static java.util.Map sequencesMap

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useGlobalSequenceIdentities

protected boolean useGlobalSequenceIdentities

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grabSize

protected int grabSize

Constructor Detail

SequenceManagerHighLowImpl

public SequenceManagerHighLowImpl(org.apache.ojb.broker.PersistenceBroker broker)

Method Detail

getUniqueId

public int getUniqueId(org.apache.ojb.broker.metadata.FieldDescriptor field)
                throws SequenceManagerException

Gets a new uniqueId for the given Class and fieldname

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