1 /*
   2  * Copyright (c) 2008, 2015, 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
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 6692027
  27  * @summary Check that custom subclasses of QueryEval can be serialized.
  28  * @author Eamonn McManus
  29  */
  30 
  31 import java.io.ByteArrayInputStream;
  32 import java.io.ByteArrayOutputStream;
  33 import java.io.ObjectInputStream;
  34 import java.io.ObjectOutputStream;
  35 import java.lang.management.ManagementFactory;
  36 import java.util.Set;
  37 import java.util.concurrent.atomic.AtomicInteger;
  38 import javax.management.MBeanServer;
  39 import javax.management.MalformedObjectNameException;
  40 import javax.management.ObjectName;
  41 import javax.management.QueryEval;
  42 import javax.management.QueryExp;
  43 
  44 public class CustomQueryTest {
  45     public static interface CountMBean {
  46         public int getCount();
  47         public void increment();
  48     }
  49 
  50     public static class Count implements CountMBean {
  51         private AtomicInteger count = new AtomicInteger();
  52 
  53         public int getCount() {
  54             return count.get();
  55         }
  56 
  57         public void increment() {
  58             count.incrementAndGet();
  59         }
  60 
  61     }
  62 
  63     public static final ObjectName countName;
  64     static {
  65         try {
  66             countName = new ObjectName("d:type=Count");
  67         } catch (MalformedObjectNameException e) {
  68             throw new AssertionError(e);
  69         }
  70     }
  71 
  72     /* A query that calls the increment method of the Count MBean every time
  73      * it is evaluated.  If there is no ObjectName filter, the query will be
  74      * evaluated for every MBean in the MBean Server, so the count will be
  75      * incremented by the number of MBeans.
  76      */
  77     public static class IncrQuery extends QueryEval implements QueryExp {
  78         public boolean apply(ObjectName name) {
  79             try {
  80                 getMBeanServer().invoke(countName, "increment", null, null);
  81                 return true;
  82             } catch (Throwable t) {
  83                 t.printStackTrace();
  84                 System.exit(1);
  85                 throw new AssertionError(); // not reached
  86             }
  87         }
  88     }
  89 
  90     public static void main(String[] args) throws Exception {
  91         MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
  92         mbs.registerMBean(new Count(), countName);
  93         int mbeanCount = mbs.getMBeanCount();
  94         QueryExp query = new IncrQuery();
  95         Set<ObjectName> names = mbs.queryNames(null, query);
  96         assertEquals(mbeanCount, names.size());
  97         assertEquals(mbeanCount, mbs.getAttribute(countName, "Count"));
  98         ByteArrayOutputStream bout = new ByteArrayOutputStream();
  99         ObjectOutputStream oout = new ObjectOutputStream(bout);
 100         oout.writeObject(query);
 101         oout.close();
 102         ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
 103         ObjectInputStream oin = new ObjectInputStream(bin);
 104         query = (QueryExp) oin.readObject();
 105         names = mbs.queryNames(null, query);
 106         assertEquals(mbeanCount * 2, mbs.getAttribute(countName, "Count"));
 107     }
 108 
 109     private static void assertEquals(Object expected, Object actual)
 110             throws Exception {
 111         if (!expected.equals(actual)) {
 112             String failure = "FAILED: expected " + expected + ", got " + actual;
 113             throw new Exception(failure);
 114         }
 115     }
 116 }