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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 {
getCount()46         public int getCount();
increment()47         public void increment();
48     }
49 
50     public static class Count implements CountMBean {
51         private AtomicInteger count = new AtomicInteger();
52 
getCount()53         public int getCount() {
54             return count.get();
55         }
56 
increment()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 {
apply(ObjectName name)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 
main(String[] args)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 
assertEquals(Object expected, Object actual)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 }
117