javax.management.relation
Interface Relation

All Known Subinterfaces:

RelationSupportMBean

public interface Relation

This interface has to be implemented by any MBean class expected to represent a relation managed using the Relation Service.

Simple relations, i.e. having only roles, no properties or methods, can be created directly by the Relation Service (represented as RelationSupport objects, internally handled by the Relation Service).

If the user wants to represent more complex relations, involving properties and/or methods, he has to provide his own class implementing the Relation interface. This can be achieved either by inheriting from RelationSupport class, or by implementing the interface (fully or delegation to a RelationSupport object member).

Specifying such user relation class is to introduce properties and/or methods. Those have to be exposed for remote management. So this means that any user relation class must be a MBean class.

Version:

1.5

Author:

Maurizio Simeoni

Method Summary

RoleResult	getAllRoles() Returns all roles present in the relation .
java.util.Map	getReferencedMBeans() Retrieves MBeans referenced in the various roles of the relation.
java.lang.String	getRelationId() Returns relation identifier (used to uniquely identify the relation inside the Relation Service)
ObjectName	getRelationServiceName() Returns ObjectName of the Relation Service handling the relation
java.lang.String	getRelationTypeName() Returns name of associated relation type.
java.util.List	getRole(java.lang.String theRoleName) Retrieves role value for given role name.
java.lang.Integer	getRoleCardinality(java.lang.String theRoleName) Returns the number of MBeans currently referenced in the given role.
RoleResult	getRoles(java.lang.String[] theRoleNameArray) Retrieves values of roles with given names
void	handleMBeanUnregistration(ObjectName theObjName, java.lang.String theRoleName) Callback used by the Relation Service when a MBean referenced in a role is unregistered.
RoleList	retrieveAllRoles() Returns all roles in the relation without checking read mode.
void	setRole(Role theRole) Sets the given role.
RoleResult	setRoles(RoleList theRoleList) Sets the given roles.

Method Detail

getAllRoles

public RoleResult getAllRoles()
                       throws RelationServiceNotRegisteredException

Returns all roles present in the relation .

Returns:

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

Throws:

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

getRole

public java.util.List getRole(java.lang.String theRoleName)
                       throws java.lang.IllegalArgumentException,
                              RoleNotFoundException,
                              RelationServiceNotRegisteredException

Retrieves role value for given role name.

Checks if the role exists and is readable according to the relation type.

Parameters:

theRoleName - name of role

Returns:

the ArrayList of ObjectName objects being the role value

Throws:

java.lang.IllegalArgumentException - if null role name

RoleNotFoundException - if:

-there is no role with given name;

-the role is not readable.

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

getRoles

public RoleResult getRoles(java.lang.String[] theRoleNameArray)
                    throws java.lang.IllegalArgumentException,
                           RelationServiceNotRegisteredException

Retrieves values of roles with given names

Checks for each role if it exists and is readable according to the relation type.

Parameters:

theRoleNameArray - array of names of roles to be retrieved

Returns:

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

Throws:

java.lang.IllegalArgumentException - if null role name

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

getRoleCardinality

public java.lang.Integer getRoleCardinality(java.lang.String theRoleName)
                                     throws java.lang.IllegalArgumentException,
                                            RoleNotFoundException

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

Parameters:

theRoleName - name of role

Returns:

the number of currently referenced MBeans in that role

Throws:

java.lang.IllegalArgumentException - if null role name

RoleNotFoundException - if there is no role with given name

retrieveAllRoles

public RoleList retrieveAllRoles()

Returns all roles in the relation without checking read mode.

Returns:

a ROlelist

setRole

public void setRole(Role theRole)
             throws java.lang.IllegalArgumentException,
                    RoleNotFoundException,
                    RelationTypeNotFoundException,
                    InvalidRoleValueException,
                    RelationServiceNotRegisteredException,
                    RelationTypeNotFoundException,
                    RelationNotFoundException

Sets the given role.

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

Will send a notification (RelationNotification with type RELATION_BASIC_UPDATE or RELATION_MBEAN_UPDATE, depending if the relation is a MBean or not).

Parameters:

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

Throws:

java.lang.IllegalArgumentException - if null role

RoleNotFoundException - if the role is not writable (no test on the write access mode performed when initialising the role).

InvalidRoleValueException - if value provided for role is not valid, i.e.:

-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 ;

-a MBean provided for that role does not exist.

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

RelationTypeNotFoundException - if the relation type has not been declared in the Relation Service.

setRoles

public RoleResult setRoles(RoleList theRoleList)
                    throws java.lang.IllegalArgumentException,
                           RelationServiceNotRegisteredException,
                           RelationTypeNotFoundException,
                           RelationNotFoundException

Sets the given roles.

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

Will send a notification (RelationNotification with type RELATION_BASIC_UPDATE or RELATION_MBEAN_UPDATE, depending if the relation is a MBean or not).

Parameters:

theRoleList - list of roles to be set

Returns:

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

Throws:

java.lang.IllegalArgumentException - if null role name

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

RelationTypeNotFoundException - if the relation type has not been declared in the Relation Service.

RelationNotFoundException - if the relation MBean has not been added in the Relation Service.

handleMBeanUnregistration

public void handleMBeanUnregistration(ObjectName theObjName,
                                      java.lang.String theRoleName)
                               throws java.lang.IllegalArgumentException,
                                      RoleNotFoundException,
                                      InvalidRoleValueException,
                                      RelationServiceNotRegisteredException,
                                      RelationTypeNotFoundException,
                                      RelationNotFoundException

Callback used by the Relation Service when a MBean referenced in a role is unregistered.

The Relation Service will call this method to let the relation take action to reflect the impact of such unregistration.

BEWARE. the user is not expected to call this method.

Current implementation is to set the role with its current value (list of ObjectNames of referenced MBeans) without the unregistered one.

Parameters:

theObjName - ObjectName of unregistered MBean

theRoleName - name of role where the MBean is referenced

Throws:

java.lang.IllegalArgumentException - if null parameter

RoleNotFoundException - if role does not exist in the relation or is not writable.

InvalidRoleValueException - if role value does not conform to the associated role info (this will never happen when called from the Relation Service).

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

RelationTypeNotFoundException - if the relation type has not been declared in the Relation Service.

RelationNotFoundException - if this method is called for a relation MBean not added in the Relation Service.

getReferencedMBeans

public java.util.Map getReferencedMBeans()

Retrieves MBeans referenced in the various roles of the relation.

Returns:

a HashMap mapping: ObjectName -> ArrayList of String (role names).

getRelationTypeName

public java.lang.String getRelationTypeName()

Returns name of associated relation type.

getRelationServiceName

public ObjectName getRelationServiceName()

Returns ObjectName of the Relation Service handling the relation

getRelationId

public java.lang.String getRelationId()

Returns relation identifier (used to uniquely identify the relation inside the Relation Service)