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1   /*
2    * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
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7    * published by the Free Software Foundation.  Oracle designates this
8    * particular file as subject to the "Classpath" exception as provided
9    * by Oracle in the LICENSE file that accompanied this code.
10   *
11   * This code is distributed in the hope that it will be useful, but WITHOUT
12   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14   * version 2 for more details (a copy is included in the LICENSE file that
15   * accompanied this code).
16   *
17   * You should have received a copy of the GNU General Public License version
18   * 2 along with this work; if not, write to the Free Software Foundation,
19   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20   *
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24   */
25  
26  package sun.jvmstat.monitor.event;
27  
28  import java.util.EventListener;
29  
30  /**
31   * Interface for listeners of MonitoredVm events.
32   *
33   * @author Brian Doherty
34   * @since 1.5
35   * @see sun.jvmstat.monitor.MonitoredVm
36   */
37  public interface VmListener extends EventListener {
38  
39      /**
40       * Invoked when instrumentation objects are inserted into or removed
41       * from the MonitoredVm.
42       *
43       * @param event the object describing the event.
44       */
45      void monitorStatusChanged(MonitorStatusChangeEvent event);
46  
47      /**
48       * Invoked when instrumentation objects are updated. This event is
49       * generated at a fixed interval as determined by the polling rate
50       * of the MonitoredVm that the VmListener is registered with.
51       *
52       * @param event the object describing the event.
53       */
54      void monitorsUpdated(VmEvent event);
55  
56      /**
57       * Invoked when the connection to the MonitoredVm has disconnected
58       * due to communication errors.
59       *
60       * @param event the object describing the event.
61       */
62      void disconnected(VmEvent event);
63  }