Java example source code file (Relation.java)

This example Java source code file (Relation.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

illegalargumentexception, integer, invalidrolevalueexception, management, map, objectname, relationnotfoundexception, relationservicenotregisteredexception, relationtypenotfoundexception, rolelist, rolenotfoundexception, roleresult, string, util

The Relation.java Java example source code

/*
 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.management.relation;

import java.util.List;
import java.util.Map;

import javax.management.ObjectName;

/**
 * This interface has to be implemented by any MBean class expected to
 * represent a relation managed using the Relation Service.
 * <P>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).
 * <P>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).
 * <P>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
 */
public interface Relation {

    /**
     * Retrieves role value for given role name.
     * <P>Checks if the role exists and is readable according to the relation
     * type.
     *
     * @param roleName  name of role
     *
     * @return the ArrayList of ObjectName objects being the role value
     *
     * @exception IllegalArgumentException  if null role name
     * @exception RoleNotFoundException  if:
     * <P>- there is no role with given name
     * <P>- the role is not readable.
     * @exception RelationServiceNotRegisteredException  if the Relation
     * Service is not registered in the MBean Server
     *
     * @see #setRole
     */
    public List<ObjectName> getRole(String roleName)
        throws IllegalArgumentException,
               RoleNotFoundException,
               RelationServiceNotRegisteredException;

    /**
     * Retrieves values of roles with given names.
     * <P>Checks for each role if it exists and is readable according to the
     * relation type.
     *
     * @param roleNameArray  array of names of roles to be retrieved
     *
     * @return a RoleResult object, including a RoleList (for roles
     * successfully retrieved) and a RoleUnresolvedList (for roles not
     * retrieved).
     *
     * @exception IllegalArgumentException  if null role name
     * @exception RelationServiceNotRegisteredException  if the Relation
     * Service is not registered in the MBean Server
     *
     * @see #setRoles
     */
    public RoleResult getRoles(String[] roleNameArray)
        throws IllegalArgumentException,
               RelationServiceNotRegisteredException;

    /**
     * Returns the number of MBeans currently referenced in the given role.
     *
     * @param roleName  name of role
     *
     * @return the number of currently referenced MBeans in that role
     *
     * @exception IllegalArgumentException  if null role name
     * @exception RoleNotFoundException  if there is no role with given name
     */
    public Integer getRoleCardinality(String roleName)
        throws IllegalArgumentException,
               RoleNotFoundException;

    /**
     * Returns all roles present in the relation.
     *
     * @return a RoleResult object, including a RoleList (for roles
     * successfully retrieved) and a RoleUnresolvedList (for roles not
     * readable).
     *
     * @exception RelationServiceNotRegisteredException  if the Relation
     * Service is not registered in the MBean Server
     */
    public RoleResult getAllRoles()
        throws RelationServiceNotRegisteredException;

    /**
     * Returns all roles in the relation without checking read mode.
     *
     * @return a RoleList.
     */
    public RoleList retrieveAllRoles();

    /**
     * Sets the given role.
     * <P>Will check the role according to its corresponding role definition
     * provided in relation's relation type
     * <P>Will send a notification (RelationNotification with type
     * RELATION_BASIC_UPDATE or RELATION_MBEAN_UPDATE, depending if the
     * relation is a MBean or not).
     *
     * @param role  role to be set (name and new value)
     *
     * @exception IllegalArgumentException  if null role
     * @exception 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)
     * @exception InvalidRoleValueException  if value provided for
     * role is not valid, i.e.:
     * <P>- the number of referenced MBeans in given value is less than
     * expected minimum degree
     * <P>- the number of referenced MBeans in provided value exceeds expected
     * maximum degree
     * <P>- one referenced MBean in the value is not an Object of the MBean
     * class expected for that role
     * <P>- a MBean provided for that role does not exist.
     * @exception RelationServiceNotRegisteredException  if the Relation
     * Service is not registered in the MBean Server
     * @exception RelationTypeNotFoundException  if the relation type has not
     * been declared in the Relation Service.
     * @exception RelationNotFoundException  if the relation has not been
     * added in the Relation Service.
     *
     * @see #getRole
     */
    public void setRole(Role role)
        throws IllegalArgumentException,
               RoleNotFoundException,
               RelationTypeNotFoundException,
               InvalidRoleValueException,
               RelationServiceNotRegisteredException,
               RelationNotFoundException;

    /**
     * Sets the given roles.
     * <P>Will check the role according to its corresponding role definition
     * provided in relation's relation type
     * <P>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.
     *
     * @param roleList  list of roles to be set
     *
     * @return a RoleResult object, including a RoleList (for roles
     * successfully set) and a RoleUnresolvedList (for roles not
     * set).
     *
     * @exception IllegalArgumentException  if null role list
     * @exception RelationServiceNotRegisteredException  if the Relation
     * Service is not registered in the MBean Server
     * @exception RelationTypeNotFoundException  if the relation type has not
     * been declared in the Relation Service.
     * @exception RelationNotFoundException  if the relation MBean has not been
     * added in the Relation Service.
     *
     * @see #getRoles
     */
    public RoleResult setRoles(RoleList roleList)
        throws IllegalArgumentException,
               RelationServiceNotRegisteredException,
               RelationTypeNotFoundException,
               RelationNotFoundException;

    /**
     * Callback used by the Relation Service when a MBean referenced in a role
     * is unregistered.
     * <P>The Relation Service will call this method to let the relation
     * take action to reflect the impact of such unregistration.
     * <P>BEWARE. the user is not expected to call this method.
     * <P>Current implementation is to set the role with its current value
     * (list of ObjectNames of referenced MBeans) without the unregistered
     * one.
     *
     * @param objectName  ObjectName of unregistered MBean
     * @param roleName  name of role where the MBean is referenced
     *
     * @exception IllegalArgumentException  if null parameter
     * @exception RoleNotFoundException  if role does not exist in the
     * relation or is not writable
     * @exception InvalidRoleValueException  if role value does not conform to
     * the associated role info (this will never happen when called from the
     * Relation Service)
     * @exception RelationServiceNotRegisteredException  if the Relation
     * Service is not registered in the MBean Server
     * @exception RelationTypeNotFoundException  if the relation type has not
     * been declared in the Relation Service.
     * @exception RelationNotFoundException  if this method is called for a
     * relation MBean not added in the Relation Service.
     */
    public void handleMBeanUnregistration(ObjectName objectName,
                                          String roleName)
        throws IllegalArgumentException,
               RoleNotFoundException,
               InvalidRoleValueException,
               RelationServiceNotRegisteredException,
               RelationTypeNotFoundException,
               RelationNotFoundException;

    /**
     * Retrieves MBeans referenced in the various roles of the relation.
     *
     * @return a HashMap mapping:
     * <P> ObjectName {@literal ->} ArrayList of String (role names)
     */
    public Map<ObjectName,List getReferencedMBeans();

    /**
     * Returns name of associated relation type.
     *
     * @return the name of the relation type.
     */
    public String getRelationTypeName();

    /**
     * Returns ObjectName of the Relation Service handling the relation.
     *
     * @return the ObjectName of the Relation Service.
     */
    public ObjectName getRelationServiceName();

    /**
     * Returns relation identifier (used to uniquely identify the relation
     * inside the Relation Service).
     *
     * @return the relation id.
     */
    public String getRelationId();
}