Java Module java.management Package javax.management.relation Interface Relation（JDK11）

143 阅读 0 评论 0 点赞

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.

Since:

1.5

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`RoleResult`	`getAllRoles()`	Returns all roles present in the relation.
`Map<ObjectName,List<String>>`	`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<ObjectName>`	`getRole(String roleName)`	Retrieves role value for given role name.
`Integer`	`getRoleCardinality(String roleName)`	Returns the number of MBeans currently referenced in the given role.
`RoleResult`	`getRoles(String[] roleNameArray)`	Retrieves values of roles with given names.
`void`	`handleMBeanUnregistration(ObjectName objectName, 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
```
List<ObjectName> getRole(String roleName)
                  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:
    
    roleName - 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
```
RoleResult getRoles(String[] roleNameArray)
             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:
    
    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:
    
    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
```
Integer getRoleCardinality(String roleName)
                    throws 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:
    
    IllegalArgumentException - if null role name
    
    RoleNotFoundException - if there is no role with given name
  - getAllRoles
```
RoleResult getAllRoles()
                throws RelationServiceNotRegisteredException
```
    Returns all roles present in the relation.
    
    Returns:
    
    a RoleResult object, including a RoleList (for roles successfully retrieved) and a RoleUnresolvedList (for roles not readable).
    
    Throws:
    
    RelationServiceNotRegisteredException - if the Relation Service is not registered in the MBean Server
  - retrieveAllRoles
```
RoleList retrieveAllRoles()
```
    Returns all roles in the relation without checking read mode.
    
    Returns:
    
    a RoleList.
  - setRole
```
void setRole(Role role)
      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:
    
    role - role to be set (name and new value)
    
    Throws:
    
    IllegalArgumentException - if null role
    
    RoleNotFoundException - if there is no role with the supplied role's name or if the role is not writable (no test on the write access mode performed when initializing 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
```
RoleResult setRoles(RoleList roleList)
             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:
    
    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:
    
    IllegalArgumentException - if null role list
    
    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
```
void handleMBeanUnregistration(ObjectName objectName,
                               String roleName)
                        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:
    
    objectName - ObjectName of unregistered MBean
    
    roleName - 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
```
Map<ObjectName,List<String>> getReferencedMBeans()
```
    Retrieves MBeans referenced in the various roles of the relation.
    
    Returns:
    
    a HashMap mapping:
    ObjectName -> ArrayList of String (role names)
  - getRelationTypeName
```
String getRelationTypeName()
```
    Returns name of associated relation type.
    
    Returns:
    
    the name of the relation type.
  - getRelationServiceName
```
ObjectName getRelationServiceName()
```
    Returns ObjectName of the Relation Service handling the relation.
    
    Returns:
    
    the ObjectName of the Relation Service.
  - getRelationId
```
String getRelationId()
```
    Returns relation identifier (used to uniquely identify the relation inside the Relation Service).
    
    Returns:
    
    the relation id.

Java Module java.management Package javax.management.relation Interface Relation（JDK11）

Interface Relation

Method Summary

Method Detail

getRole

getRoles

getRoleCardinality

getAllRoles

retrieveAllRoles

setRole

setRoles

handleMBeanUnregistration

getReferencedMBeans

getRelationTypeName

getRelationServiceName

getRelationId