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  * @modules java.management
  30  */
  31 
  32 import java.io.ByteArrayInputStream;
  33 import java.io.ByteArrayOutputStream;
  34 import java.io.ObjectInputStream;
  35 import java.io.ObjectOutputStream;
  36 import java.lang.management.ManagementFactory;
  37 import java.util.Set;
  38 import java.util.concurrent.atomic.AtomicInteger;
  39 import javax.management.MBeanServer;
  40 import javax.management.MalformedObjectNameException;
  41 import javax.management.ObjectName;
  42 import javax.management.QueryEval;
  43 import javax.management.QueryExp;
  44 
  45 public class CustomQueryTest {
  46     public static interface CountMBean {
  47         public int getCount();
  48         public void increment();
  49     }
  50 
  51     public static class Count implements CountMBean {
  52         private AtomicInteger count = new AtomicInteger();
  53 
  54         public int getCount() {
  55             return count.get();
  56         }
  57 
  58         public void increment() {
  59             count.incrementAndGet();
  60         }
  61 
  62     }
  63 
  64     public static final ObjectName countName;
  65     static {
  66         try {
  67             countName = new ObjectName("d:type=Count");
  68         } catch (MalformedObjectNameException e) {
  69             throw new AssertionError(e);
  70         }
  71     }
  72 
  73     /* A query that calls the increment method of the Count MBean every time
  74      * it is evaluated.  If there is no ObjectName filter, the query will be
  75      * evaluated for every MBean in the MBean Server, so the count will be
  76      * incremented by the number of MBeans.
  77      */
  78     public static class IncrQuery extends QueryEval implements QueryExp {
  79         public boolean apply(ObjectName name) {
  80             try {
  81                 getMBeanServer().invoke(countName, "increment", null, null);
  82                 return true;
  83             } catch (Throwable t) {
  84                 t.printStackTrace();
  85                 System.exit(1);
  86                 throw new AssertionError(); // not reached
  87             }
  88         }
  89     }
  90 
  91     public static void main(String[] args) throws Exception {
  92         MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
  93         mbs.registerMBean(new Count(), countName);
  94         int mbeanCount = mbs.getMBeanCount();
  95         QueryExp query = new IncrQuery();
  96         Set<ObjectName> names = mbs.queryNames(null, query);
  97         assertEquals(mbeanCount, names.size());
  98         assertEquals(mbeanCount, mbs.getAttribute(countName, "Count"));
  99         ByteArrayOutputStream bout = new ByteArrayOutputStream();
 100         ObjectOutputStream oout = new ObjectOutputStream(bout);
 101         oout.writeObject(query);
 102         oout.close();
 103         ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
 104         ObjectInputStream oin = new ObjectInputStream(bin);
 105         query = (QueryExp) oin.readObject();
 106         names = mbs.queryNames(null, query);
 107         assertEquals(mbeanCount * 2, mbs.getAttribute(countName, "Count"));
 108     }
 109 
 110     private static void assertEquals(Object expected, Object actual)
 111             throws Exception {
 112         if (!expected.equals(actual)) {
 113             String failure = "FAILED: expected " + expected + ", got " + actual;
 114             throw new Exception(failure);
 115         }
 116     }
 117 }