javax.management.relation

Class RelationService

java.lang.Object

javax.management.NotificationBroadcasterSupport

javax.management.relation.RelationService

All Implemented Interfaces:

EventListener, MBeanRegistration, NotificationBroadcaster, NotificationEmitter, NotificationListener, RelationServiceMBean

public class RelationService
extends NotificationBroadcasterSupport
implements RelationServiceMBean, MBeanRegistration, NotificationListener

The Relation Service is in charge of creating and deleting relation types and relations, of handling the consistency and of providing query mechanisms.

It implements the NotificationBroadcaster by extending NotificationBroadcasterSupport to send notifications when a relation is removed from it.

It implements the NotificationListener interface to be able to receive notifications concerning unregistration of MBeans referenced in relation roles and of relation MBeans.

It implements the MBeanRegistration interface to be able to retrieve its ObjectName and MBean Server.

Since:

1.5

Constructor Summary

Constructors

Constructor and Description
RelationService(boolean immediatePurgeFlag) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	addRelation(ObjectName relationObjectName) Adds an MBean created by the user (and registered by him in the MBean Server) as a relation in the Relation Service.
void	addRelationType(RelationType relationTypeObj) Adds given object as a relation type.
Integer	checkRoleReading(String roleName, String relationTypeName) Checks if given Role can be read in a relation of the given type.
Integer	checkRoleWriting(Role role, String relationTypeName, Boolean initFlag) Checks if given Role can be set in a relation of given type.
void	createRelation(String relationId, String relationTypeName, RoleList roleList) Creates a simple relation (represented by a RelationSupport object) of given relation type, and adds it in the Relation Service.
void	createRelationType(String relationTypeName, RoleInfo[] roleInfoArray) Creates a relation type (a RelationTypeSupport object) with given role infos (provided by the RoleInfo objects), and adds it in the Relation Service.
Map<ObjectName,List<String>>	findAssociatedMBeans(ObjectName mbeanName, String relationTypeName, String roleName) Retrieves the MBeans associated to given one in a relation.
Map<String,List<String>>	findReferencingRelations(ObjectName mbeanName, String relationTypeName, String roleName) Retrieves the relations where a given MBean is referenced.
List<String>	findRelationsOfType(String relationTypeName) Returns the relation ids for relations of the given type.
List<String>	getAllRelationIds() Returns all the relation ids for all the relations handled by the Relation Service.
List<String>	getAllRelationTypeNames() Retrieves names of all known relation types.
RoleResult	getAllRoles(String relationId) Returns all roles present in the relation.
MBeanNotificationInfo[]	getNotificationInfo() Returns a NotificationInfo object containing the name of the Java class of the notification and the notification types sent.
boolean	getPurgeFlag() Returns the flag to indicate if when a notification is received for the unregistration of an MBean referenced in a relation, if an immediate "purge" of the relations (look for the relations no longer valid) has to be performed , or if that will be performed only when the purgeRelations method will be explicitly called.
Map<ObjectName,List<String>>	getReferencedMBeans(String relationId) Retrieves MBeans referenced in the various roles of the relation.
String	getRelationTypeName(String relationId) Returns name of associated relation type for given relation.
List<ObjectName>	getRole(String relationId, String roleName) Retrieves role value for given role name in given relation.
Integer	getRoleCardinality(String relationId, String roleName) Retrieves the number of MBeans currently referenced in the given role.
RoleInfo	getRoleInfo(String relationTypeName, String roleInfoName) Retrieves role info for given role name of a given relation type.
List<RoleInfo>	getRoleInfos(String relationTypeName) Retrieves list of role infos (RoleInfo objects) of a given relation type.
RoleResult	getRoles(String relationId, String[] roleNameArray) Retrieves values of roles with given names in given relation.
void	handleNotification(Notification notif, Object handback) Invoked when a JMX notification occurs.
Boolean	hasRelation(String relationId) Checks if there is a relation identified in Relation Service with given relation id.
void	isActive() Checks if the Relation Service is active.
String	isRelation(ObjectName objectName) Returns the relation id associated to the given ObjectName if the MBean has been added as a relation in the Relation Service.
ObjectName	isRelationMBean(String relationId) If the relation is represented by an MBean (created by the user and added as a relation in the Relation Service), returns the ObjectName of the MBean.
void	postDeregister() Allows the MBean to perform any operations needed after having been unregistered in the MBean server.
void	postRegister(Boolean registrationDone) Allows the MBean to perform any operations needed after having been registered in the MBean server or after the registration has failed.
void	preDeregister() Allows the MBean to perform any operations it needs before being unregistered by the MBean server.
ObjectName	preRegister(MBeanServer server, ObjectName name) Allows the MBean to perform any operations it needs before being registered in the MBean Server.
void	purgeRelations() Purges the relations.
void	removeRelation(String relationId) Removes given relation from the Relation Service.
void	removeRelationType(String relationTypeName) Removes given relation type from Relation Service.
void	sendRelationCreationNotification(String relationId) Sends a notification (RelationNotification) for a relation creation.
void	sendRelationRemovalNotification(String relationId, List<ObjectName> unregMBeanList) Sends a notification (RelationNotification) for a relation removal.
void	sendRoleUpdateNotification(String relationId, Role newRole, List<ObjectName> oldValue) Sends a notification (RelationNotification) for a role update in the given relation.
void	setPurgeFlag(boolean purgeFlag) Sets the flag to indicate if when a notification is received for the unregistration of an MBean referenced in a relation, if an immediate "purge" of the relations (look for the relations no longer valid) has to be performed , or if that will be performed only when the purgeRelations method will be explicitly called.
void	setRole(String relationId, Role role) Sets the given role in given relation.
RoleResult	setRoles(String relationId, RoleList roleList) Sets the given roles in given relation.
void	updateRoleMap(String relationId, Role newRole, List<ObjectName> oldValue) Handles update of the Relation Service role map for the update of given role in given relation.

Methods inherited from class javax.management.NotificationBroadcasterSupport

addNotificationListener, handleNotification, removeNotificationListener, removeNotificationListener, sendNotification

Methods inherited from class java.lang.Object

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

Constructor Detail

RelationService

public RelationService(boolean immediatePurgeFlag)

Constructor.

Parameters:

immediatePurgeFlag - flag to indicate when a notification is received for the unregistration of an MBean referenced in a relation, if an immediate "purge" of the relations (look for the relations no longer valid) has to be performed , or if that will be performed only when the purgeRelations method will be explicitly called.

true is immediate purge.

Method Detail

isActive

public void isActive()
              throws RelationServiceNotRegisteredException

Checks if the Relation Service is active. Current condition is that the Relation Service must be registered in the MBean Server

Specified by:

isActive in interface RelationServiceMBean

Throws:

RelationServiceNotRegisteredException - if it is not registered

preRegister

public ObjectName preRegister(MBeanServer server,
                     ObjectName name)
                       throws Exception

Description copied from interface: MBeanRegistration

Allows the MBean to perform any operations it needs before being registered in the MBean Server. If the name of the MBean is not specified, the MBean can provide a name for its registration. If any exception is raised, the MBean will not be registered in the MBean Server.

Specified by:

preRegister in interface MBeanRegistration

Parameters:

server - The MBean Server in which the MBean will be registered.

name - The object name of the MBean. This name is null if the name parameter to one of the createMBean or registerMBean methods in the MBeanServer interface is null. In that case, this method must return a non-null ObjectName for the new MBean.

Returns:

The name under which the MBean is to be registered. This value must not be null. If the name parameter is not null, it will usually but not necessarily be the returned value.

Throws:

Exception - This exception will be caught by the MBean Server and re-thrown as an MBeanRegistrationException.

postRegister

public void postRegister(Boolean registrationDone)

Description copied from interface: MBeanRegistration

Allows the MBean to perform any operations needed after having been registered in the MBean server or after the registration has failed.

If the implementation of this method throws a RuntimeException or an Error, the MBean Server will rethrow those inside a RuntimeMBeanException or RuntimeErrorException, respectively. However, throwing an exception in postRegister will not change the state of the MBean: if the MBean was already registered (registrationDone is true), the MBean will remain registered.

This might be confusing for the code calling createMBean() or registerMBean(), as such code might assume that MBean registration has failed when such an exception is raised. Therefore it is recommended that implementations of postRegister do not throw Runtime Exceptions or Errors if it can be avoided.

Specified by:

postRegister in interface MBeanRegistration

Parameters:

registrationDone - Indicates whether or not the MBean has been successfully registered in the MBean server. The value false means that the registration phase has failed.

preDeregister

public void preDeregister()
                   throws Exception

Description copied from interface: MBeanRegistration

Allows the MBean to perform any operations it needs before being unregistered by the MBean server.

Specified by:

preDeregister in interface MBeanRegistration

Throws:

Exception - This exception will be caught by the MBean server and re-thrown as an MBeanRegistrationException.

postDeregister

public void postDeregister()

Description copied from interface: MBeanRegistration

Allows the MBean to perform any operations needed after having been unregistered in the MBean server.

If the implementation of this method throws a RuntimeException or an Error, the MBean Server will rethrow those inside a RuntimeMBeanException or RuntimeErrorException, respectively. However, throwing an exception in postDeregister will not change the state of the MBean: the MBean was already successfully deregistered and will remain so.

This might be confusing for the code calling unregisterMBean(), as it might assume that MBean deregistration has failed. Therefore it is recommended that implementations of postDeregister do not throw Runtime Exceptions or Errors if it can be avoided.

Specified by:

postDeregister in interface MBeanRegistration

getPurgeFlag

public boolean getPurgeFlag()

Returns the flag to indicate if when a notification is received for the unregistration of an MBean referenced in a relation, if an immediate "purge" of the relations (look for the relations no longer valid) has to be performed , or if that will be performed only when the purgeRelations method will be explicitly called.

true is immediate purge.

Specified by:

getPurgeFlag in interface RelationServiceMBean

Returns:

true if purges are automatic.

See Also:

setPurgeFlag(boolean)

setPurgeFlag

public void setPurgeFlag(boolean purgeFlag)

Sets the flag to indicate if when a notification is received for the unregistration of an MBean referenced in a relation, if an immediate "purge" of the relations (look for the relations no longer valid) has to be performed , or if that will be performed only when the purgeRelations method will be explicitly called.

true is immediate purge.

Specified by:

setPurgeFlag in interface RelationServiceMBean

Parameters:

purgeFlag - flag

See Also:

getPurgeFlag()

createRelationType

public void createRelationType(String relationTypeName,
                      RoleInfo[] roleInfoArray)
                        throws IllegalArgumentException,
                               InvalidRelationTypeException

Creates a relation type (a RelationTypeSupport object) with given role infos (provided by the RoleInfo objects), and adds it in the Relation Service.

Specified by:

createRelationType in interface RelationServiceMBean

Parameters:

relationTypeName - name of the relation type

roleInfoArray - array of role infos

Throws:

IllegalArgumentException - if null parameter

InvalidRelationTypeException - If:

- there is already a relation type with that name

- the same name has been used for two different role infos

- no role info provided

- one null role info provided

addRelationType

public void addRelationType(RelationType relationTypeObj)
                     throws IllegalArgumentException,
                            InvalidRelationTypeException

Adds given object as a relation type. The object is expected to implement the RelationType interface.

Specified by:

addRelationType in interface RelationServiceMBean

Parameters:

relationTypeObj - relation type object (implementing the RelationType interface)

Throws:

IllegalArgumentException - if null parameter or if relationTypeObj.getRelationTypeName() returns null.

InvalidRelationTypeException - if:

- the same name has been used for two different roles

- no role info provided

- one null role info provided

- there is already a relation type with that name

getAllRelationTypeNames

public List<String> getAllRelationTypeNames()

Retrieves names of all known relation types.

Specified by:

getAllRelationTypeNames in interface RelationServiceMBean

Returns:

ArrayList of relation type names (Strings)

getRoleInfos

public List<RoleInfo> getRoleInfos(String relationTypeName)
                            throws IllegalArgumentException,
                                   RelationTypeNotFoundException

Retrieves list of role infos (RoleInfo objects) of a given relation type.

Specified by:

getRoleInfos in interface RelationServiceMBean

Parameters:

relationTypeName - name of relation type

Returns:

ArrayList of RoleInfo.

Throws:

IllegalArgumentException - if null parameter

RelationTypeNotFoundException - if there is no relation type with that name.

getRoleInfo

public RoleInfo getRoleInfo(String relationTypeName,
                   String roleInfoName)
                     throws IllegalArgumentException,
                            RelationTypeNotFoundException,
                            RoleInfoNotFoundException

Retrieves role info for given role name of a given relation type.

Specified by:

getRoleInfo in interface RelationServiceMBean

Parameters:

relationTypeName - name of relation type

roleInfoName - name of role

Returns:

RoleInfo object.

Throws:

IllegalArgumentException - if null parameter

RelationTypeNotFoundException - if the relation type is not known in the Relation Service

RoleInfoNotFoundException - if the role is not part of the relation type.

removeRelationType

public void removeRelationType(String relationTypeName)
                        throws RelationServiceNotRegisteredException,
                               IllegalArgumentException,
                               RelationTypeNotFoundException

Removes given relation type from Relation Service.

The relation objects of that type will be removed from the Relation Service.

Specified by:

removeRelationType in interface RelationServiceMBean

Parameters:

relationTypeName - name of the relation type to be removed

Throws:

RelationServiceNotRegisteredException - if the Relation Service is not registered in the MBean Server

IllegalArgumentException - if null parameter

RelationTypeNotFoundException - If there is no relation type with that name

createRelation

public void createRelation(String relationId,
                  String relationTypeName,
                  RoleList roleList)
                    throws RelationServiceNotRegisteredException,
                           IllegalArgumentException,
                           RoleNotFoundException,
                           InvalidRelationIdException,
                           RelationTypeNotFoundException,
                           InvalidRoleValueException

Creates a simple relation (represented by a RelationSupport object) of given relation type, and adds it in the Relation Service.

Roles are initialized according to the role list provided in parameter. The ones not initialized in this way are set to an empty ArrayList of ObjectNames.

A RelationNotification, with type RELATION_BASIC_CREATION, is sent.

Specified by:

createRelation in interface RelationServiceMBean

Parameters:

relationId - relation identifier, to identify uniquely the relation inside the Relation Service

relationTypeName - name of the relation type (has to be created in the Relation Service)

roleList - role list to initialize roles of the relation (can be null).

Throws:

RelationServiceNotRegisteredException - if the Relation Service is not registered in the MBean Server

IllegalArgumentException - if null parameter, except the role list which can be null if no role initialization

RoleNotFoundException - if a value is provided for a role that does not exist in the relation type

InvalidRelationIdException - if relation id already used

RelationTypeNotFoundException - if relation type not known in Relation Service

InvalidRoleValueException - if:

- the same role name is used for two different roles

- the number of referenced MBeans in given value is less than expected minimum degree

- the number of referenced MBeans in provided value exceeds expected maximum degree

- one referenced MBean in the value is not an Object of the MBean class expected for that role

- an MBean provided for that role does not exist

addRelation

public void addRelation(ObjectName relationObjectName)
                 throws IllegalArgumentException,
                        RelationServiceNotRegisteredException,
                        NoSuchMethodException,
                        InvalidRelationIdException,
                        InstanceNotFoundException,
                        InvalidRelationServiceException,
                        RelationTypeNotFoundException,
                        RoleNotFoundException,
                        InvalidRoleValueException

Adds an MBean created by the user (and registered by him in the MBean Server) as a relation in the Relation Service.

To be added as a relation, the MBean must conform to the following:

- implement the Relation interface

- have for RelationService ObjectName the ObjectName of current Relation Service

- have a relation id unique and unused in current Relation Service

- have for relation type a relation type created in the Relation Service

- have roles conforming to the role info provided in the relation type.

Specified by:

addRelation in interface RelationServiceMBean

Parameters:

relationObjectName - ObjectName of the relation MBean to be added.

Throws:

IllegalArgumentException - if null parameter

RelationServiceNotRegisteredException - if the Relation Service is not registered in the MBean Server

NoSuchMethodException - If the MBean does not implement the Relation interface

InvalidRelationIdException - if:

- no relation identifier in MBean

- the relation identifier is already used in the Relation Service

InstanceNotFoundException - if the MBean for given ObjectName has not been registered

InvalidRelationServiceException - if:

- no Relation Service name in MBean

- the Relation Service name in the MBean is not the one of the current Relation Service

RelationTypeNotFoundException - if:

- no relation type name in MBean

- the relation type name in MBean does not correspond to a relation type created in the Relation Service

InvalidRoleValueException - if:

- the number of referenced MBeans in a role is less than expected minimum degree

- the number of referenced MBeans in a role exceeds expected maximum degree

- one referenced MBean in the value is not an Object of the MBean class expected for that role

- an MBean provided for a role does not exist

RoleNotFoundException - if a value is provided for a role that does not exist in the relation type

isRelationMBean

public ObjectName isRelationMBean(String relationId)
                           throws IllegalArgumentException,
                                  RelationNotFoundException

If the relation is represented by an MBean (created by the user and added as a relation in the Relation Service), returns the ObjectName of the MBean.

Specified by:

isRelationMBean in interface RelationServiceMBean

Parameters:

relationId - relation id identifying the relation

Returns:

ObjectName of the corresponding relation MBean, or null if the relation is not an MBean.

Throws:

IllegalArgumentException - if null parameter

RelationNotFoundException - there is no relation associated to that id

isRelation

public String isRelation(ObjectName objectName)
                  throws IllegalArgumentException

Returns the relation id associated to the given ObjectName if the MBean has been added as a relation in the Relation Service.

Specified by:

isRelation in interface RelationServiceMBean

Parameters:

objectName - ObjectName of supposed relation

Returns:

relation id (String) or null (if the ObjectName is not a relation handled by the Relation Service)

Throws:

IllegalArgumentException - if null parameter

hasRelation

public Boolean hasRelation(String relationId)
                    throws IllegalArgumentException

Checks if there is a relation identified in Relation Service with given relation id.

Specified by:

hasRelation in interface RelationServiceMBean

Parameters:

relationId - relation id identifying the relation

Returns:

boolean: true if there is a relation, false else

Throws:

IllegalArgumentException - if null parameter

getAllRelationIds

public List<String> getAllRelationIds()

Returns all the relation ids for all the relations handled by the Relation Service.

Specified by:

getAllRelationIds in interface RelationServiceMBean

Returns:

ArrayList of String

checkRoleReading

public Integer checkRoleReading(String roleName,
                       String relationTypeName)
                         throws IllegalArgumentException,
                                RelationTypeNotFoundException

Checks if given Role can be read in a relation of the given type.

Specified by:

checkRoleReading in interface RelationServiceMBean

Parameters:

roleName - name of role to be checked

relationTypeName - name of the relation type

Returns:

an Integer wrapping an integer corresponding to possible problems represented as constants in RoleUnresolved:

- 0 if role can be read

- integer corresponding to RoleStatus.NO_ROLE_WITH_NAME

- integer corresponding to RoleStatus.ROLE_NOT_READABLE

Throws:

IllegalArgumentException - if null parameter

RelationTypeNotFoundException - if the relation type is not known in the Relation Service

checkRoleWriting

public Integer checkRoleWriting(Role role,
                       String relationTypeName,
                       Boolean initFlag)
                         throws IllegalArgumentException,
                                RelationTypeNotFoundException

Checks if given Role can be set in a relation of given type.

Specified by:

checkRoleWriting in interface RelationServiceMBean

Parameters:

role - role to be checked

relationTypeName - name of relation type

initFlag - flag to specify that the checking is done for the initialization of a role, write access shall not be verified.

Returns:

an Integer wrapping an integer corresponding to possible problems represented as constants in RoleUnresolved:

- 0 if role can be set

- integer corresponding to RoleStatus.NO_ROLE_WITH_NAME

- integer for RoleStatus.ROLE_NOT_WRITABLE

- integer for RoleStatus.LESS_THAN_MIN_ROLE_DEGREE

- integer for RoleStatus.MORE_THAN_MAX_ROLE_DEGREE

- integer for RoleStatus.REF_MBEAN_OF_INCORRECT_CLASS

- integer for RoleStatus.REF_MBEAN_NOT_REGISTERED

Throws:

IllegalArgumentException - if null parameter

RelationTypeNotFoundException - if unknown relation type

sendRelationCreationNotification

public void sendRelationCreationNotification(String relationId)
                                      throws IllegalArgumentException,
                                             RelationNotFoundException

Sends a notification (RelationNotification) for a relation creation. The notification type is:

- RelationNotification.RELATION_BASIC_CREATION if the relation is an object internal to the Relation Service

- RelationNotification.RELATION_MBEAN_CREATION if the relation is a MBean added as a relation.

The source object is the Relation Service itself.

It is called in Relation Service createRelation() and addRelation() methods.

Specified by:

sendRelationCreationNotification in interface RelationServiceMBean

Parameters:

relationId - relation identifier of the updated relation

Throws:

IllegalArgumentException - if null parameter

RelationNotFoundException - if there is no relation for given relation id

sendRoleUpdateNotification

public void sendRoleUpdateNotification(String relationId,
                              Role newRole,
                              List<ObjectName> oldValue)
                                throws IllegalArgumentException,
                                       RelationNotFoundException

Sends a notification (RelationNotification) for a role update in the given relation. The notification type is:

- RelationNotification.RELATION_BASIC_UPDATE if the relation is an object internal to the Relation Service

- RelationNotification.RELATION_MBEAN_UPDATE if the relation is a MBean added as a relation.

The source object is the Relation Service itself.

It is called in relation MBean setRole() (for given role) and setRoles() (for each role) methods (implementation provided in RelationSupport class).

It is also called in Relation Service setRole() (for given role) and setRoles() (for each role) methods.

Specified by:

sendRoleUpdateNotification in interface RelationServiceMBean

Parameters:

relationId - relation identifier of the updated relation

newRole - new role (name and new value)

oldValue - old role value (List of ObjectName objects)

Throws:

IllegalArgumentException - if null parameter

RelationNotFoundException - if there is no relation for given relation id

sendRelationRemovalNotification

public void sendRelationRemovalNotification(String relationId,
                                   List<ObjectName> unregMBeanList)
                                     throws IllegalArgumentException,
                                            RelationNotFoundException

Sends a notification (RelationNotification) for a relation removal. The notification type is:

- RelationNotification.RELATION_BASIC_REMOVAL if the relation is an object internal to the Relation Service

- RelationNotification.RELATION_MBEAN_REMOVAL if the relation is a MBean added as a relation.

The source object is the Relation Service itself.

It is called in Relation Service removeRelation() method.

Specified by:

sendRelationRemovalNotification in interface RelationServiceMBean

Parameters:

relationId - relation identifier of the updated relation

unregMBeanList - List of ObjectNames of MBeans expected to be unregistered due to relation removal (can be null)

Throws:

IllegalArgumentException - if null parameter

RelationNotFoundException - if there is no relation for given relation id

updateRoleMap

public void updateRoleMap(String relationId,
                 Role newRole,
                 List<ObjectName> oldValue)
                   throws IllegalArgumentException,
                          RelationServiceNotRegisteredException,
                          RelationNotFoundException

Handles update of the Relation Service role map for the update of given role in given relation.

It is called in relation MBean setRole() (for given role) and setRoles() (for each role) methods (implementation provided in RelationSupport class).

It is also called in Relation Service setRole() (for given role) and setRoles() (for each role) methods.

To allow the Relation Service to maintain the consistency (in case of MBean unregistration) and to be able to perform queries, this method must be called when a role is updated.

Specified by:

updateRoleMap in interface RelationServiceMBean

Parameters:

relationId - relation identifier of the updated relation

newRole - new role (name and new value)

oldValue - old role value (List of ObjectName objects)

Throws:

IllegalArgumentException - if null parameter

RelationServiceNotRegisteredException - if the Relation Service is not registered in the MBean Server

RelationNotFoundException - if no relation for given id.

removeRelation

public void removeRelation(String relationId)
                    throws RelationServiceNotRegisteredException,
                           IllegalArgumentException,
                           RelationNotFoundException

Removes given relation from the Relation Service.

A RelationNotification notification is sent, its type being:

- RelationNotification.RELATION_BASIC_REMOVAL if the relation was only internal to the Relation Service

- RelationNotification.RELATION_MBEAN_REMOVAL if the relation is registered as an MBean.

For MBeans referenced in such relation, nothing will be done,

Specified by:

removeRelation in interface RelationServiceMBean

Parameters:

relationId - relation id of the relation to be removed

Throws:

RelationServiceNotRegisteredException - if the Relation Service is not registered in the MBean Server

IllegalArgumentException - if null parameter

RelationNotFoundException - if no relation corresponding to given relation id

purgeRelations

public void purgeRelations()
                    throws RelationServiceNotRegisteredException

Purges the relations.

Depending on the purgeFlag value, this method is either called automatically when a notification is received for the unregistration of an MBean referenced in a relation (if the flag is set to true), or not (if the flag is set to false).

In that case it is up to the user to call it to maintain the consistency of the relations. To be kept in mind that if an MBean is unregistered and the purge not done immediately, if the ObjectName is reused and assigned to another MBean referenced in a relation, calling manually this purgeRelations() method will cause trouble, as will consider the ObjectName as corresponding to the unregistered MBean, not seeing the new one.

The behavior depends on the cardinality of the role where the unregistered MBean is referenced:

- if removing one MBean reference in the role makes its number of references less than the minimum degree, the relation has to be removed.

- if the remaining number of references after removing the MBean reference is still in the cardinality range, keep the relation and update it calling its handleMBeanUnregistration() callback.

Specified by:

purgeRelations in interface RelationServiceMBean

Throws:

RelationServiceNotRegisteredException - if the Relation Service is not registered in the MBean Server.

findReferencingRelations

public Map<String,List<String>> findReferencingRelations(ObjectName mbeanName,
                                                String relationTypeName,
                                                String roleName)
                                                  throws IllegalArgumentException

Retrieves the relations where a given MBean is referenced.

This corresponds to the CIM "References" and "ReferenceNames" operations.

Specified by:

findReferencingRelations in interface RelationServiceMBean

Parameters:

mbeanName - ObjectName of MBean

relationTypeName - can be null; if specified, only the relations of that type will be considered in the search. Else all relation types are considered.

roleName - can be null; if specified, only the relations where the MBean is referenced in that role will be returned. Else all roles are considered.

Returns:

an HashMap, where the keys are the relation ids of the relations where the MBean is referenced, and the value is, for each key, an ArrayList of role names (as an MBean can be referenced in several roles in the same relation).

Throws:

IllegalArgumentException - if null parameter

findAssociatedMBeans

public Map<ObjectName,List<String>> findAssociatedMBeans(ObjectName mbeanName,
                                                String relationTypeName,
                                                String roleName)
                                                  throws IllegalArgumentException

Retrieves the MBeans associated to given one in a relation.

This corresponds to CIM Associators and AssociatorNames operations.

Specified by:

findAssociatedMBeans in interface RelationServiceMBean

Parameters:

mbeanName - ObjectName of MBean

relationTypeName - can be null; if specified, only the relations of that type will be considered in the search. Else all relation types are considered.

roleName - can be null; if specified, only the relations where the MBean is referenced in that role will be considered. Else all roles are considered.

Returns:

an HashMap, where the keys are the ObjectNames of the MBeans associated to given MBean, and the value is, for each key, an ArrayList of the relation ids of the relations where the key MBean is associated to given one (as they can be associated in several different relations).

Throws:

IllegalArgumentException - if null parameter

findRelationsOfType

public List<String> findRelationsOfType(String relationTypeName)
                                 throws IllegalArgumentException,
                                        RelationTypeNotFoundException

Returns the relation ids for relations of the given type.

Specified by:

findRelationsOfType in interface RelationServiceMBean

Parameters:

relationTypeName - relation type name

Returns:

an ArrayList of relation ids.

Throws:

IllegalArgumentException - if null parameter

RelationTypeNotFoundException - if there is no relation type with that name.

getRole

public List<ObjectName> getRole(String relationId,
                       String roleName)
                         throws RelationServiceNotRegisteredException,
                                IllegalArgumentException,
                                RelationNotFoundException,
                                RoleNotFoundException

Retrieves role value for given role name in given relation.

Specified by:

getRole in interface RelationServiceMBean

Parameters:

relationId - relation id

roleName - name of role

Returns:

the ArrayList of ObjectName objects being the role value

Throws:

RelationServiceNotRegisteredException - if the Relation Service is not registered

IllegalArgumentException - if null parameter

RelationNotFoundException - if no relation with given id

RoleNotFoundException - if:

- there is no role with given name

or

- the role is not readable.

See Also:

setRole(java.lang.String, javax.management.relation.Role)

getRoles

public RoleResult getRoles(String relationId,
                  String[] roleNameArray)
                    throws RelationServiceNotRegisteredException,
                           IllegalArgumentException,
                           RelationNotFoundException

Retrieves values of roles with given names in given relation.

Specified by:

getRoles in interface RelationServiceMBean

Parameters:

relationId - relation id

roleNameArray - array of names of roles to be retrieved

Returns:

a RoleResult object, including a RoleList (for roles successfully retrieved) and a RoleUnresolvedList (for roles not retrieved).

Throws:

RelationServiceNotRegisteredException - if the Relation Service is not registered in the MBean Server

IllegalArgumentException - if null parameter

RelationNotFoundException - if no relation with given id

See Also:

setRoles(java.lang.String, javax.management.relation.RoleList)

getAllRoles

public RoleResult getAllRoles(String relationId)
                       throws IllegalArgumentException,
                              RelationNotFoundException,
                              RelationServiceNotRegisteredException

Returns all roles present in the relation.

Specified by:

getAllRoles in interface RelationServiceMBean

Parameters:

relationId - relation id

Returns:

a RoleResult object, including a RoleList (for roles successfully retrieved) and a RoleUnresolvedList (for roles not readable).

Throws:

IllegalArgumentException - if null parameter

RelationNotFoundException - if no relation for given id

RelationServiceNotRegisteredException - if the Relation Service is not registered in the MBean Server

getRoleCardinality

public Integer getRoleCardinality(String relationId,
                         String roleName)
                           throws IllegalArgumentException,
                                  RelationNotFoundException,
                                  RoleNotFoundException

Retrieves the number of MBeans currently referenced in the given role.

Specified by:

getRoleCardinality in interface RelationServiceMBean

Parameters:

relationId - relation id

roleName - name of role

Returns:

the number of currently referenced MBeans in that role

Throws:

IllegalArgumentException - if null parameter

RelationNotFoundException - if no relation with given id

RoleNotFoundException - if there is no role with given name

setRole

public void setRole(String relationId,
           Role role)
             throws RelationServiceNotRegisteredException,
                    IllegalArgumentException,
                    RelationNotFoundException,
                    RoleNotFoundException,
                    InvalidRoleValueException

Sets the given role in given relation.

Will check the role according to its corresponding role definition provided in relation's relation type

The Relation Service will keep track of the change to keep the consistency of relations by handling referenced MBean unregistrations.

Specified by:

setRole in interface RelationServiceMBean

Parameters:

relationId - relation id

role - role to be set (name and new value)

Throws:

RelationServiceNotRegisteredException - if the Relation Service is not registered in the MBean Server

IllegalArgumentException - if null parameter

RelationNotFoundException - if no relation with given id

RoleNotFoundException - if the role does not exist or is not writable

InvalidRoleValueException - if value provided for role is not valid:

- the number of referenced MBeans in given value is less than expected minimum degree

or

- the number of referenced MBeans in provided value exceeds expected maximum degree

or

- one referenced MBean in the value is not an Object of the MBean class expected for that role

or

- an MBean provided for that role does not exist

See Also:

getRole(java.lang.String, java.lang.String)

setRoles

public RoleResult setRoles(String relationId,
                  RoleList roleList)
                    throws RelationServiceNotRegisteredException,
                           IllegalArgumentException,
                           RelationNotFoundException

Sets the given roles in given relation.

Will check the role according to its corresponding role definition provided in relation's relation type

The Relation Service keeps track of the changes to keep the consistency of relations by handling referenced MBean unregistrations.

Specified by:

setRoles in interface RelationServiceMBean

Parameters:

relationId - relation id

roleList - list of roles to be set

Returns:

a RoleResult object, including a RoleList (for roles successfully set) and a RoleUnresolvedList (for roles not set).

Throws:

RelationServiceNotRegisteredException - if the Relation Service is not registered in the MBean Server

IllegalArgumentException - if null parameter

RelationNotFoundException - if no relation with given id

See Also:

getRoles(java.lang.String, java.lang.String[])

getReferencedMBeans

public Map<ObjectName,List<String>> getReferencedMBeans(String relationId)
                                                 throws IllegalArgumentException,
                                                        RelationNotFoundException

Retrieves MBeans referenced in the various roles of the relation.

Specified by:

getReferencedMBeans in interface RelationServiceMBean

Parameters:

relationId - relation id

Returns:

a HashMap mapping:

ObjectName -> ArrayList of String (role names)

Throws:

IllegalArgumentException - if null parameter

RelationNotFoundException - if no relation for given relation id

getRelationTypeName

public String getRelationTypeName(String relationId)
                           throws IllegalArgumentException,
                                  RelationNotFoundException

Returns name of associated relation type for given relation.

Specified by:

getRelationTypeName in interface RelationServiceMBean

Parameters:

relationId - relation id

Returns:

the name of the associated relation type.

Throws:

IllegalArgumentException - if null parameter

RelationNotFoundException - if no relation for given relation id

handleNotification

public void handleNotification(Notification notif,
                      Object handback)

Invoked when a JMX notification occurs. Currently handles notifications for unregistration of MBeans, either referenced in a relation role or being a relation itself.

Specified by:

handleNotification in interface NotificationListener

Parameters:

notif - The notification.

handback - An opaque object which helps the listener to associate information regarding the MBean emitter (can be null).

getNotificationInfo

public MBeanNotificationInfo[] getNotificationInfo()

Returns a NotificationInfo object containing the name of the Java class of the notification and the notification types sent.

Specified by:

getNotificationInfo in interface NotificationBroadcaster

Overrides:

getNotificationInfo in class NotificationBroadcasterSupport

Returns:

the array of possible notifications.