org.apache.oozie.service
Class UUIDService

java.lang.Object
  org.apache.oozie.service.UUIDService

All Implemented Interfaces:

Service

public class UUIDService
extends Object
implements Service

The UUID service generates unique IDs.

The configuration property CONF_GENERATOR specifies the ID generation type, 'random' or 'counter'.

For 'random' uses the JDK UUID.randomUUID() method.

For 'counter' uses a counter postfixed wit the system start up time.

Nested Class Summary

static class

UUIDService.ApplicationType

Field Summary

static String	CONF_GENERATOR
static String	CONF_PREFIX

Fields inherited from interface org.apache.oozie.service.Service

DEFAULT_LOCK_TIMEOUT, lockTimeout, USE_XCOMMAND

Constructor Summary

UUIDService()

Method Summary

void	destroy() Destroy the UUID service.
String	generateChildId(String id, String childName) Create a child ID.
String	generateId(UUIDService.ApplicationType type) Create a unique ID.
String	getChildName(String childId) Return the child name from a child ID.
String	getId(String childId) Return the ID from a child ID.
Class<? extends Service>	getInterface() Return the public interface for UUID service.
void	init(Services services) Initialize the UUID service.

Methods inherited from class java.lang.Object

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

Field Detail

CONF_PREFIX

public static final String CONF_PREFIX

See Also:

Constant Field Values

CONF_GENERATOR

public static final String CONF_GENERATOR

See Also:

Constant Field Values

Constructor Detail

UUIDService

public UUIDService()

Method Detail

init

public void init(Services services)
          throws ServiceException

Initialize the UUID service.

Specified by:

init in interface Service

Parameters:

services - services instance.

Throws:

ServiceException - thrown if the UUID service could not be initialized.

destroy

public void destroy()

Destroy the UUID service.

Specified by:

destroy in interface Service

getInterface

public Class<? extends Service> getInterface()

Return the public interface for UUID service.

Specified by:

getInterface in interface Service

Returns:

UUIDService.

generateId

public String generateId(UUIDService.ApplicationType type)

Create a unique ID.

Parameters:

type: - Type of Id. Generally 'C' for Coordinator and 'W' for Workflow.

Returns:

unique ID.

generateChildId

public String generateChildId(String id,
                              String childName)

Create a child ID.

If the same child name is given the returned child ID is the same.

Parameters:

id - unique ID.

childName - child name.

Returns:

a child ID.

getId

public String getId(String childId)

Return the ID from a child ID.

Parameters:

childId - child ID.

Returns:

ID of the child ID.

getChildName

public String getChildName(String childId)

Return the child name from a child ID.

Parameters:

childId - child ID.

Returns:

child name.