https://openjdk.java.net/ 
/*
 * 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.
 */
/*
 * @author    IBM Corp.
 *
 * Copyright IBM Corp. 1999-2000.  All rights reserved.
 */

package javax.management;

import javax.management.MBeanException;
import javax.management.RuntimeOperationsException;
import javax.management.InstanceNotFoundException;


 This class is the interface to be implemented by MBeans that are meant to be
 persistent.  MBeans supporting this interface should call the load method during
 construction in order to prime the MBean from the persistent store.
 In the case of a ModelMBean, the store method should be called by the MBeanServer based on the descriptors in
 the ModelMBean or by the MBean itself during normal processing of the ModelMBean.

Since:1.5
/**
 *  This class is the interface to be implemented by MBeans that are meant to be
 *  persistent.  MBeans supporting this interface should call the load method during
 *  construction in order to prime the MBean from the persistent store.
 *  In the case of a ModelMBean, the store method should be called by the MBeanServer based on the descriptors in
 *  the ModelMBean or by the MBean itself during normal processing of the ModelMBean.
 *
 * @since 1.5
 */
public interface PersistentMBean {


    
Instantiates thisMBean instance with the data found for
the MBean in the persistent store.  The data loaded could include
attribute and operation values.
This method should be called during construction or initialization of this instance,
and before the MBean is registered with the MBeanServer.

Throws:
/**
     * Instantiates thisMBean instance with the data found for
     * the MBean in the persistent store.  The data loaded could include
     * attribute and operation values.
     *
     * This method should be called during construction or initialization of this instance,
     * and before the MBean is registered with the MBeanServer.
     *
     * @exception MBeanException Wraps another exception or persistence is not supported
     * @exception RuntimeOperationsException Wraps exceptions from the persistence mechanism
     * @exception InstanceNotFoundException Could not find or load this MBean from persistent
     *                                      storage
     */
    public void load()
    throws MBeanException, RuntimeOperationsException, InstanceNotFoundException;

    
Captures the current state of this MBean instance and
writes it out to the persistent store.  The state stored could include
attribute and operation values. If one of these methods of persistence is
not supported a "serviceNotFound" exception will be thrown.


Persistence policy from the MBean and attribute descriptor is used to guide execution
of this method. The MBean should be stored if 'persistPolicy' field is:

 != "never"
  = "always"
  = "onTimer" and now > 'lastPersistTime' + 'persistPeriod'
  = "NoMoreOftenThan" and now > 'lastPersistTime' + 'persistPeriod'
  = "onUnregister"




Do not store the MBean if 'persistPolicy' field is:

   = "never"
   = "onUpdate"
   = "onTimer" && now < 'lastPersistTime' + 'persistPeriod'



Throws:
/**
     * Captures the current state of this MBean instance and
     * writes it out to the persistent store.  The state stored could include
     * attribute and operation values. If one of these methods of persistence is
     * not supported a "serviceNotFound" exception will be thrown.
     * <P>
     * Persistence policy from the MBean and attribute descriptor is used to guide execution
     * of this method. The MBean should be stored if 'persistPolicy' field is:
     * <PRE>{@literal  != "never"
     *   = "always"
     *   = "onTimer" and now > 'lastPersistTime' + 'persistPeriod'
     *   = "NoMoreOftenThan" and now > 'lastPersistTime' + 'persistPeriod'
     *   = "onUnregister"
     * }</PRE>
     * <p>
     * Do not store the MBean if 'persistPolicy' field is:
     * <PRE>{@literal
     *    = "never"
     *    = "onUpdate"
     *    = "onTimer" && now < 'lastPersistTime' + 'persistPeriod'
     * }</PRE>
     *
     * @exception MBeanException Wraps another exception or persistence is not supported
     * @exception RuntimeOperationsException Wraps exceptions from the persistence mechanism
     * @exception InstanceNotFoundException Could not find/access the persistent store
     */
    public void store()
    throws MBeanException, RuntimeOperationsException, InstanceNotFoundException;

}