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/*
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* Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package javax.management;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.ObjectStreamField;
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import java.util.EventObject;
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import java.security.AccessController;
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import com.sun.jmx.mbeanserver.GetPropertyAction;
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/**
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* <p>The Notification class represents a notification emitted by an
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* MBean. It contains a reference to the source MBean: if the
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* notification has been forwarded through the MBean server, and the
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* original source of the notification was a reference to the emitting
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* MBean object, then the MBean server replaces it by the MBean's
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* ObjectName. If the listener has registered directly with the
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* MBean, this is either the object name or a direct reference to the
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* MBean.</p>
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*
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* <p>It is strongly recommended that notification senders use the
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* object name rather than a reference to the MBean object as the
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* source.</p>
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*
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* <p>The <b>serialVersionUID</b> of this class is <code>-7516092053498031989L</code>.
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*
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* @since 1.5
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*/
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@SuppressWarnings("serial") // serialVersionUID is not constant
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public class Notification extends EventObject {
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// Serialization compatibility stuff:
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// Two serial forms are supported in this class. The selected form depends
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// on system property "jmx.serial.form":
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// - "1.0" for JMX 1.0
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// - any other value for JMX 1.1 and higher
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//
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// Serial version for old serial form
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private static final long oldSerialVersionUID = 1716977971058914352L;
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//
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// Serial version for new serial form
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private static final long newSerialVersionUID = -7516092053498031989L;
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//
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// Serializable fields in old serial form
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private static final ObjectStreamField[] oldSerialPersistentFields =
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{
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new ObjectStreamField("message", String.class),
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new ObjectStreamField("sequenceNumber", Long.TYPE),
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new ObjectStreamField("source", Object.class),
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new ObjectStreamField("sourceObjectName", ObjectName.class),
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new ObjectStreamField("timeStamp", Long.TYPE),
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new ObjectStreamField("type", String.class),
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new ObjectStreamField("userData", Object.class)
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};
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//
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// Serializable fields in new serial form
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private static final ObjectStreamField[] newSerialPersistentFields =
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{
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new ObjectStreamField("message", String.class),
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new ObjectStreamField("sequenceNumber", Long.TYPE),
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new ObjectStreamField("source", Object.class),
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new ObjectStreamField("timeStamp", Long.TYPE),
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new ObjectStreamField("type", String.class),
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new ObjectStreamField("userData", Object.class)
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};
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//
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// Actual serial version and serial form
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private static final long serialVersionUID;
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/**
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* @serialField type String The notification type.
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* A string expressed in a dot notation similar to Java properties.
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* An example of a notification type is network.alarm.router
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* @serialField sequenceNumber long The notification sequence number.
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* A serial number which identify particular instance
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* of notification in the context of the notification source.
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* @serialField timeStamp long The notification timestamp.
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* Indicating when the notification was generated
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* @serialField userData Object The notification user data.
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* Used for whatever other data the notification
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* source wishes to communicate to its consumers
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* @serialField message String The notification message.
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* @serialField source Object The object on which the notification initially occurred.
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*/
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private static final ObjectStreamField[] serialPersistentFields;
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private static boolean compat = false;
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static {
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try {
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GetPropertyAction act = new GetPropertyAction("jmx.serial.form");
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String form = AccessController.doPrivileged(act);
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compat = (form != null && form.equals("1.0"));
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} catch (Exception e) {
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// OK: exception means no compat with 1.0, too bad
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}
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if (compat) {
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serialPersistentFields = oldSerialPersistentFields;
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serialVersionUID = oldSerialVersionUID;
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} else {
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serialPersistentFields = newSerialPersistentFields;
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serialVersionUID = newSerialVersionUID;
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}
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}
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//
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// END Serialization compatibility stuff
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/**
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* @serial The notification type.
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* A string expressed in a dot notation similar to Java properties.
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* An example of a notification type is network.alarm.router
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*/
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private String type;
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/**
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* @serial The notification sequence number.
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* A serial number which identify particular instance
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* of notification in the context of the notification source.
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*/
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private long sequenceNumber;
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/**
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* @serial The notification timestamp.
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* Indicating when the notification was generated
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*/
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private long timeStamp;
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/**
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* @serial The notification user data.
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* Used for whatever other data the notification
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* source wishes to communicate to its consumers
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*/
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private Object userData = null;
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/**
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* @serial The notification message.
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*/
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private String message = "";
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/**
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* <p>This field hides the {@link EventObject#source} field in the
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* parent class to make it non-transient and therefore part of the
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* serialized form.</p>
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*
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* @serial The object on which the notification initially occurred.
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*/
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protected Object source = null;
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/**
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* Creates a Notification object.
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* The notification timeStamp is set to the current date.
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*
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* @param type The notification type.
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* @param source The notification source.
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* @param sequenceNumber The notification sequence number within the source object.
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*
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*/
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public Notification(String type, Object source, long sequenceNumber) {
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super (source) ;
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this.source = source;
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this.type = type;
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this.sequenceNumber = sequenceNumber ;
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this.timeStamp = (new java.util.Date()).getTime() ;
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}
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/**
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* Creates a Notification object.
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* The notification timeStamp is set to the current date.
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*
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* @param type The notification type.
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* @param source The notification source.
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* @param sequenceNumber The notification sequence number within the source object.
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* @param message The detailed message.
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*
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*/
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public Notification(String type, Object source, long sequenceNumber, String message) {
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super (source) ;
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this.source = source;
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this.type = type;
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this.sequenceNumber = sequenceNumber ;
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this.timeStamp = (new java.util.Date()).getTime() ;
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this.message = message ;
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}
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/**
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* Creates a Notification object.
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*
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* @param type The notification type.
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* @param source The notification source.
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* @param sequenceNumber The notification sequence number within the source object.
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* @param timeStamp The notification emission date.
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*
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*/
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public Notification(String type, Object source, long sequenceNumber, long timeStamp) {
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super (source) ;
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this.source = source;
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this.type = type ;
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this.sequenceNumber = sequenceNumber ;
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this.timeStamp = timeStamp ;
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}
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/**
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* Creates a Notification object.
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*
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* @param type The notification type.
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* @param source The notification source.
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* @param sequenceNumber The notification sequence number within the source object.
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* @param timeStamp The notification emission date.
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* @param message The detailed message.
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*
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*/
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public Notification(String type, Object source, long sequenceNumber, long timeStamp, String message) {
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super (source) ;
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this.source = source;
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this.type = type ;
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this.sequenceNumber = sequenceNumber ;
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this.timeStamp = timeStamp ;
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this.message = message ;
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}
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/**
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* Sets the source.
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*
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* @param source the new source for this object.
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*
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* @see EventObject#getSource
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*/
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public void setSource(Object source) {
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super.source = source;
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this.source = source;
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}
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/**
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* Get the notification sequence number.
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*
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* @return The notification sequence number within the source object. It's a serial number
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* identifying a particular instance of notification in the context of the notification source.
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* The notification model does not assume that notifications will be received in the same order
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* that they are sent. The sequence number helps listeners to sort received notifications.
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*
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* @see #setSequenceNumber
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*/
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public long getSequenceNumber() {
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return sequenceNumber ;
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}
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/**
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* Set the notification sequence number.
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*
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* @param sequenceNumber The notification sequence number within the source object. It is
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* a serial number identifying a particular instance of notification in the
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* context of the notification source.
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*
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* @see #getSequenceNumber
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*/
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public void setSequenceNumber(long sequenceNumber) {
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this.sequenceNumber = sequenceNumber;
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}
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/**
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* Get the notification type.
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*
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* @return The notification type. It's a string expressed in a dot notation similar
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* to Java properties. An example of a notification type is network.alarm.router .
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*/
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public String getType() {
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return type ;
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}
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/**
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* Get the notification timestamp.
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*
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* @return The notification timestamp.
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*
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* @see #setTimeStamp
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*/
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public long getTimeStamp() {
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return timeStamp ;
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}
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/**
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* Set the notification timestamp.
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*
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* @param timeStamp The notification timestamp. It indicates when the notification was generated.
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*
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* @see #getTimeStamp
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*/
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public void setTimeStamp(long timeStamp) {
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this.timeStamp = timeStamp;
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}
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/**
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* Get the notification message.
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*
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* @return The message string of this notification object. It contains in a string,
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* which could be the explanation of the notification for displaying to a user
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*
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*/
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public String getMessage() {
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return message ;
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}
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/**
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* Get the user data.
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*
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* @return The user data object. It is used for whatever data
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* the notification source wishes to communicate to its consumers.
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*
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* @see #setUserData
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*/
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public Object getUserData() {
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return userData ;
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}
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/**
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* Set the user data.
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*
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* @param userData The user data object. It is used for whatever data
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* the notification source wishes to communicate to its consumers.
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*
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* @see #getUserData
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*/
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public void setUserData(Object userData) {
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this.userData = userData ;
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}
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/**
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* Returns a String representation of this notification.
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*
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* @return A String representation of this notification.
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*/
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public String toString() {
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return super.toString()+"[type="+type+"][message="+message+"]";
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}
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/**
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* Deserializes a {@link Notification} from an {@link ObjectInputStream}.
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*/
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private void readObject(ObjectInputStream in)
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throws IOException, ClassNotFoundException {
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// New serial form ignores extra field "sourceObjectName"
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in.defaultReadObject();
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super.source = source;
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}
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/**
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* Serializes a {@link Notification} to an {@link ObjectOutputStream}.
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*/
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private void writeObject(ObjectOutputStream out)
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throws IOException {
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if (compat) {
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// Serializes this instance in the old serial form
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//
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ObjectOutputStream.PutField fields = out.putFields();
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fields.put("type", type);
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fields.put("sequenceNumber", sequenceNumber);
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fields.put("timeStamp", timeStamp);
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fields.put("userData", userData);
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fields.put("message", message);
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fields.put("source", source);
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out.writeFields();
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} else {
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// Serializes this instance in the new serial form
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//
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out.defaultWriteObject();
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}
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}
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}
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