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## javax.management.relation
Interface RelationServiceMBean

All Known Implementing Classes:
  RelationService

    public interface RelationServiceMBean

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

Since:
  1.5

Method Summary
`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 (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.
`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unregistration of an MBean referenced in a relation, if an immediate "purge" of the relations (look for the relations no longer valid) has to be performed, or if that will be performed only when the purgeRelations method is explicitly called.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 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.
`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` | `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> oldRoleValue)` 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 is 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> oldRoleValue)` Handles update of the Relation Service role map for the update of given role in given relation.

Method Detail

### isActive

    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

  Throws:
    `RelationServiceNotRegisteredException` - if it is not registered

### getPurgeFlag

    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 is explicitly called.

  true is immediate purge.

  Returns:
    true if purges are immediate.
  See Also:
    `setPurgeFlag(boolean)`

### setPurgeFlag

    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 is explicitly called.

  true is immediate purge.

  Parameters:
    `purgeFlag` - flag
  See Also:
    `getPurgeFlag()`

### createRelationType

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

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

  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

    void addRelationType(RelationType relationTypeObj)
                         throws IllegalArgumentException,
                                InvalidRelationTypeException

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

  Parameters:
    `relationTypeObj` - relation type object (implementing the RelationType interface)
  Throws:
    `IllegalArgumentException` - if null parameter or if `relationTypeObj.getRelationTypeName()` returns null.
    `InvalidRelationTypeException` - if there is already a relation type with that name

### getAllRelationTypeNames

    List<String> getAllRelationTypeNames()

  Retrieves names of all known relation types.

  Returns:
    ArrayList of relation type names (Strings)

### getRoleInfos

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

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

  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

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

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

  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

    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.

  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

    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.

  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
    `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

    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 that is 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.

  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

    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.

  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

    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.

  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

    Boolean hasRelation(String relationId)
                        throws IllegalArgumentException

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

  Parameters:
    `relationId` - relation id identifying the relation
  Returns:
    boolean: true if there is a relation, false else
  Throws:
    `IllegalArgumentException` - if null parameter

### getAllRelationIds

    List<String> getAllRelationIds()

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

  Returns:
    ArrayList of String

### checkRoleReading

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

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

  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

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

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

  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

    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.

  Parameters:
    `relationId` - relation identifier of the updated relation
  Throws:
    `IllegalArgumentException` - if null parameter
    `RelationNotFoundException` - if there is no relation for given relation id

### sendRoleUpdateNotification

    void sendRoleUpdateNotification(String relationId,
                                    Role newRole,
                                    List<ObjectName> oldRoleValue)
                                    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.

  Parameters:
    `relationId` - relation identifier of the updated relation
    `newRole` - new role (name and new value)
    `oldRoleValue` - old role value (List of ObjectName objects)
  Throws:
    `IllegalArgumentException` - if null parameter
    `RelationNotFoundException` - if there is no relation for given relation id

### sendRelationRemovalNotification

    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.

  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

    void updateRoleMap(String relationId,
                       Role newRole,
                       List<ObjectName> oldRoleValue)
                       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.

  Parameters:
    `relationId` - relation identifier of the updated relation
    `newRole` - new role (name and new value)
    `oldRoleValue` - 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

    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,

  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

    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.

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

### findReferencingRelations

    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.

  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

    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.

  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

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

  Returns the relation ids for relations of the given type.

  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

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

  Retrieves role value for given role name in given relation.

  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

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

  Retrieves values of roles with given names in given relation.

  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

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

  Returns all roles present in the relation.

  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

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

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

  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

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

  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.

  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:

    - internal relation

    and

    - the role does not exist or is not writable

    `InvalidRoleValueException` - if internal relation and 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

    `RelationTypeNotFoundException` - if unknown relation type
  See Also:
    `getRole(java.lang.String, java.lang.String)`

### setRoles

    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.

  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

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

  Retrieves MBeans referenced in the various roles of the relation.

  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

    String getRelationTypeName(String relationId)
                               throws IllegalArgumentException,
                                      RelationNotFoundException

  Returns name of associated relation type for given relation.

  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

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