/* * Copyright (c) 2006, 2007, 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 com.sun.tools.jconsole; import javax.management.MBeanServerConnection;import java.beans.PropertyChangeListener;import javax.swing.event.SwingPropertyChangeSupport; /** * {@code JConsoleContext} represents a JConsole connection to a target * application. * <p> * {@code JConsoleContext} notifies any {@code PropertyChangeListeners} * about the {@linkplain #CONNECTION_STATE_PROPERTY <i>ConnectionState</i>} * property change to {@link ConnectionState#CONNECTED CONNECTED} and * {@link ConnectionState#DISCONNECTED DISCONNECTED}. * The {@code JConsoleContext} instance will be the source for * any generated events. * <p> * * @since 1.6 */public interface JConsoleContext {    /**     * The {@link ConnectionState ConnectionState} bound property name.     */    public static String CONNECTION_STATE_PROPERTY = "connectionState";     /**     * Values for the {@linkplain #CONNECTION_STATE_PROPERTY     * <i>ConnectionState</i>} bound property.     */    public enum ConnectionState {        /**         * The connection has been successfully established.         */        CONNECTED,        /**         * No connection present.         */        DISCONNECTED,        /**         * The connection is being attempted.         */        CONNECTING    }     /**     * Returns the {@link MBeanServerConnection MBeanServerConnection} for the     * connection to an application.  The returned     * {@code MBeanServerConnection} object becomes invalid when     * the connection state is changed to the     * {@link ConnectionState#DISCONNECTED DISCONNECTED} state.     *     * @return the {@code MBeanServerConnection} for the     * connection to an application.     */    public MBeanServerConnection getMBeanServerConnection();     /**     * Returns the current connection state.     * @return the current connection state.     */    public ConnectionState getConnectionState();     /**     * Add a {@link java.beans.PropertyChangeListener PropertyChangeListener}     * to the listener list.     * The listener is registered for all properties.     * The same listener object may be added more than once, and will be called     * as many times as it is added.     * If {@code listener} is {@code null}, no exception is thrown and     * no action is taken.     *     * @param listener  The {@code PropertyChangeListener} to be added     */    public void addPropertyChangeListener(PropertyChangeListener listener);     /**     * Removes a {@link java.beans.PropertyChangeListener PropertyChangeListener}     * from the listener list. This     * removes a {@code PropertyChangeListener} that was registered for all     * properties. If {@code listener} was added more than once to the same     * event source, it will be notified one less time after being removed. If     * {@code listener} is {@code null}, or was never added, no exception is     * thrown and no action is taken.     *     * @param listener the {@code PropertyChangeListener} to be removed     */    public void removePropertyChangeListener(PropertyChangeListener listener);}