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## 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
`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 roleName)` Retrieves role value for given role name.
`java.lang.Integer` | `getRoleCardinality(java.lang.String roleName)` Returns the number of MBeans currently referenced in the given role
`RoleResult` | `getRoles(java.lang.String[] roleNameArray)` Retrieves values of roles with given names.
`void` | `handleMBeanUnregistration(ObjectName objectName, java.lang.String roleName)` 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 role)` Sets the given role.
`RoleResult` | `setRoles(RoleList roleList)` Sets the given roles.

Method Detail

### getRole

    public java.util.List getRole(java.lang.String roleName)
                           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:
    `roleName` - 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[] roleNameArray)
                        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:
    `roleNameArray` - 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 roleName)
                                         throws java.lang.IllegalArgumentException,
                                                RoleNotFoundException

  Returns the number of MBeans currently referenced in the given role

  Parameters:
    `roleName` - 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

### 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 role)
                 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:
    `role` - 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.
    `RelationNotFoundException`

### setRoles

    public RoleResult setRoles(RoleList roleList)
                        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 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:
    `roleList` - 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 objectName,
                                          java.lang.String roleName)
                                   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:
    `objectName` - ObjectName of unregistered MBean
    `roleName` - 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)

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