net.exogeni.orca.drivers.util

Class NumericIDGenerator

java.lang.Object

net.exogeni.orca.drivers.util.NumericIDGenerator

public class NumericIDGenerator
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
protected int	idCount
protected static java.util.Properties	idMap Map of VM names to a unique number
protected org.apache.log4j.Logger	logger The logger.
protected java.lang.String	path Location for storing the map file.

Constructor Summary

Constructors

Constructor and Description
NumericIDGenerator(java.lang.String path, org.apache.log4j.Logger logger) Creates a new instance of the generator.

Method Summary

Modifier and Type	Method and Description
int	generateIdentifier(java.lang.String key) Generates a new numeric identifier.
java.lang.Integer	getIdentifier(java.lang.String key) Returns the numeric identifier that corresponds to the given key or null if no identifier has been generated or some error occurs while retrieving the identifier.
void	initialize()
int	releaseIdentifier(java.lang.String key) Releases the identifier corresponding to the key.

Methods inherited from class java.lang.Object

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

Field Detail

idCount

protected int idCount

idMap

protected static java.util.Properties idMap

Map of VM names to a unique number

path

protected java.lang.String path

Location for storing the map file.

logger

protected org.apache.log4j.Logger logger

The logger.

Constructor Detail

NumericIDGenerator

public NumericIDGenerator(java.lang.String path,
                          org.apache.log4j.Logger logger)

Creates a new instance of the generator.

Parameters:

path - location for storing the map file

logger - logger to use

Method Detail

initialize

public void initialize()
                throws java.lang.Exception

Throws:

java.lang.Exception

generateIdentifier

public int generateIdentifier(java.lang.String key)

Generates a new numeric identifier.

Parameters:

key - key

Returns:

0 - success, negative number - error

releaseIdentifier

public int releaseIdentifier(java.lang.String key)

Releases the identifier corresponding to the key.

Parameters:

key - key

Returns:

0 - success, negative number - an error

getIdentifier

public java.lang.Integer getIdentifier(java.lang.String key)

Returns the numeric identifier that corresponds to the given key or null if no identifier has been generated or some error occurs while retrieving the identifier.

Parameters:

key - key

Returns:

numeric identifier, can be null