javax.management.relation
Interface Relation

All Known Subinterfaces:
RelationSupportMBean
All Known Implementing Classes:
RelationSupport
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.

Method Summary
 RoleResult getAllRoles()
          Returns all roles present in the relation.
 Map getReferencedMBeans()
          Retrieves MBeans referenced in the various roles of the relation.
 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.
 String getRelationTypeName()
          Returns name of associated relation type.
 List getRole(String theRoleName)
          Retrieves role value for given role name.
 Integer getRoleCardinality(String theRoleName)
          Returns the number of MBeans currently referenced in the given role.
 RoleResult getRoles(String[] theRoleNameArray)
          Retrieves values of roles with given names.
 void handleMBeanUnregistration(ObjectName theObjName, 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

getRole

public List getRole(String theRoleName)
             throws 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:
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
See Also:
setRole(javax.management.relation.Role)

getRoles

public RoleResult getRoles(String[] theRoleNameArray)
                    throws 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:
IllegalArgumentException - if null role name
RelationServiceNotRegisteredException - if the Relation Service is not registered in the MBean Server
See Also:
setRoles(javax.management.relation.RoleList)

getRoleCardinality

public Integer getRoleCardinality(String theRoleName)
                           throws 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:
IllegalArgumentException - if null role name
RoleNotFoundException - if there is no role with given name

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

retrieveAllRoles

public RoleList retrieveAllRoles()
Returns all roles in the relation without checking read mode.

Returns:
a RoleList.

setRole

public void setRole(Role theRole)
             throws IllegalArgumentException,
                    RoleNotFoundException,
                    RelationTypeNotFoundException,
                    InvalidRoleValueException,
                    RelationServiceNotRegisteredException,
                    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:
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.
RelationNotFoundException - if the relation has not been added in the Relation Service.
See Also:
getRole(java.lang.String)

setRoles

public RoleResult setRoles(RoleList theRoleList)
                    throws 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 one notification (RelationNotification with type RELATION_BASIC_UPDATE or RELATION_MBEAN_UPDATE, depending if the relation is a MBean or not) per updated role.

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:
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.
See Also:
getRoles(java.lang.String[])

handleMBeanUnregistration

public void handleMBeanUnregistration(ObjectName theObjName,
                                      String theRoleName)
                               throws 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:
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 Map getReferencedMBeans()
Retrieves MBeans referenced in the various roles of the relation.

Returns:
a HashMap mapping:

ObjectName -> ArrayList of String (role names)

getRelationTypeName

public String getRelationTypeName()
Returns name of associated relation type.

Returns:
the name of the relation type.

getRelationServiceName

public ObjectName getRelationServiceName()
Returns ObjectName of the Relation Service handling the relation.

Returns:
the ObjectName of the Relation Service.

getRelationId

public String getRelationId()
Returns relation identifier (used to uniquely identify the relation inside the Relation Service).

Returns:
the relation id.
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