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-/* MBeanServerDelegate.java -- The management server delegate.
- Copyright (C) 2006 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath 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 for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-package javax.management;
-
-import gnu.javax.management.ListenerData;
-import gnu.classpath.SystemProperties;
-
-import java.net.InetAddress;
-import java.net.UnknownHostException;
-
-import java.util.ArrayList;
-import java.util.Date;
-import java.util.Iterator;
-import java.util.List;
-
-/**
- * Provides an implementation of a delegate bean, which is associated
- * with a management server. The delegate bean is responsible
- * for providing metadata about the server and handling the
- * registration and deregistration notifications.
- *
- * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
- * @since 1.5
- */
-public class MBeanServerDelegate
- implements MBeanServerDelegateMBean, NotificationEmitter
-{
-
- /**
- * The identifier of the server associated with this delegate.
- */
- private String id;
-
- /**
- * The listeners registered with the delegate.
- */
- private final List<ListenerData> listeners =
- new ArrayList<ListenerData>();
-
- /**
- * The sequence identifier used by the delegate.
- */
- private long seqNo;
-
- /**
- * Default constructor which generates the id.
- */
- public MBeanServerDelegate()
- {
- String hostName;
- try
- {
- hostName = InetAddress.getLocalHost().getHostName();
- }
- catch (UnknownHostException e)
- {
- hostName = "Unknown host";
- }
- id = hostName + "_" + new Date().getTime();
- }
-
- /**
- * Registers the specified listener as a new recipient of
- * notifications from the delegate. If non-null, the filter
- * argument will be used to select which notifications are
- * delivered. The supplied object will also be passed to
- * the recipient with each notification. This should not
- * be modified by the broadcaster, but instead should be
- * passed unmodified to the listener.
- *
- * @param listener the new listener, who will receive
- * notifications from this broadcasting bean.
- * @param filter a filter to determine which notifications are
- * delivered to the listener, or <code>null</code>
- * if no filtering is required.
- * @param passback an object to be passed to the listener with
- * each notification.
- * @throws IllegalArgumentException if <code>listener</code> is
- * <code>null</code>.
- * @see #removeNotificationListener(NotificationListener)
- */
- public void addNotificationListener(NotificationListener listener,
- NotificationFilter filter,
- Object passback)
- throws IllegalArgumentException
- {
- if (listener == null)
- throw new IllegalArgumentException("A null listener was supplied.");
- listeners.add(new ListenerData(listener, filter, passback));
- }
-
- /**
- * Returns the name of this Java Management eXtensions (JMX) implementation.
- *
- * @return the implementation name.
- */
- public String getImplementationName()
- {
- return "GNU JMX";
- }
-
- /**
- * Returns the vendor of this Java Management eXtensions (JMX) implementation.
- *
- * @return the implementation vendor.
- */
- public String getImplementationVendor()
- {
- return "The GNU Classpath Project";
- }
-
- /**
- * Returns the version of this Java Management eXtensions (JMX) implementation.
- *
- * @return the implementation version.
- */
- public String getImplementationVersion()
- {
- return SystemProperties.getProperty("gnu.classpath.version");
- }
-
- /**
- * Returns the unique identifier for this management server.
- *
- * @return the unique id of the server.
- */
- public String getMBeanServerId()
- {
- return id;
- }
-
- /**
- * Returns an array describing the notifications this
- * bean may send to its registered listeners. Ideally, this
- * array should be complete, but in some cases, this may
- * not be possible. However, be aware that some listeners
- * may expect this to be so.
- *
- * @return the array of possible notifications.
- */
- public MBeanNotificationInfo[] getNotificationInfo()
- {
- return new MBeanNotificationInfo[]
- {
- new MBeanNotificationInfo(new String[]
- {
- MBeanServerNotification.REGISTRATION_NOTIFICATION,
- MBeanServerNotification.UNREGISTRATION_NOTIFICATION,
- },
- MBeanServerNotification.class.getName(),
- "Server registration notifications")
- };
- }
-
- /**
- * Returns the name of this Java Management eXtensions (JMX) specification.
- *
- * @return the specification name.
- */
- public String getSpecificationName()
- {
- return "JMX";
- }
-
-
- /**
- * Returns the vendor of this Java Management eXtensions (JMX) specification.
- *
- * @return the specification vendor.
- */
- public String getSpecificationVendor()
- {
- return "Sun Microsystems";
- }
-
- /**
- * Returns the version of this Java Management eXtensions (JMX) specification.
- *
- * @return the specification version.
- */
- public String getSpecificationVersion()
- {
- return "1.2";
- }
-
- /**
- * Removes the specified listener from the list of recipients
- * of notifications from this bean. This includes all combinations
- * of filters and passback objects registered for this listener.
- * For more specific removal of listeners, see
- * {@link #removeNotificationListener(NotificationListener,
- * NotificationFilter, java.lang.Object)}
- *
- * @param listener the listener to remove.
- * @throws ListenerNotFoundException if the specified listener
- * is not registered with this bean.
- * @see #addNotificationListener(NotificationListener, NotificationFilter,
- * java.lang.Object)
- */
- public void removeNotificationListener(NotificationListener listener)
- throws ListenerNotFoundException
- {
- Iterator<ListenerData> it = listeners.iterator();
- boolean foundOne = false;
- while (it.hasNext())
- {
- if (it.next().getListener() == listener)
- {
- it.remove();
- foundOne = true;
- }
- }
- if (!foundOne)
- throw new ListenerNotFoundException("The specified listener, " + listener +
- "is not registered with this bean.");
- }
-
- /**
- * Removes the specified listener from the list of recipients
- * of notifications from this delegate. Only the first instance with
- * the supplied filter and passback object is removed.
- * <code>null</code> is used as a valid value for these parameters,
- * rather than as a way to remove all registration instances for
- * the specified listener; for this behaviour instead, see
- * {@link #removeNotificationListener(NotificationListener)}.
- *
- * @param listener the listener to remove.
- * @param filter the filter of the listener to remove.
- * @param passback the passback object of the listener to remove.
- * @throws ListenerNotFoundException if the specified listener
- * is not registered with this bean.
- * @see #addNotificationListener(NotificationListener, NotificationFilter,
- * java.lang.Object)
- * @see #removeNotificationListener(NotificationListener)
- */
- public void removeNotificationListener(NotificationListener listener,
- NotificationFilter filter,
- Object passback)
- throws ListenerNotFoundException
- {
- if (!(listeners.remove(new ListenerData(listener, filter, passback))))
- {
- throw new ListenerNotFoundException("The specified listener, " + listener +
- " with filter " + filter +
- "and passback " + passback +
- ", is not registered with this bean.");
- }
- }
-
- /**
- * Allows the server to use the delegate to send a notification.
- * If the supplied notification has a sequence number <= 0, then
- * it is replaced with the delegate's own sequence number.
- *
- * @param notification the notification to send.
- */
- public void sendNotification(Notification notification)
- {
- if (notification.getSequenceNumber() <= 0)
- notification.setSequenceNumber(++seqNo);
- for (ListenerData ldata : listeners)
- {
- NotificationFilter filter = ldata.getFilter();
- if (filter == null || filter.isNotificationEnabled(notification))
- ldata.getListener().handleNotification(notification, ldata.getPassback());
- }
- }
-
-}