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Java > Open Source Codes > org > jboss > test > aop > jdk15 > dynamic > common > InstanceInterceptor


1 /*
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3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
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7   * This is free software; you can redistribute it and/or modify it
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9   * published by the Free Software Foundation; either version 2.1 of
10   * the License, or (at your option) any later version.
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12   * This software is distributed in the hope that it will be useful,
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14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * Lesser General Public License for more details.
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17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this software; if not, write to the Free
19   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21   */
22 package org.jboss.test.aop.jdk15.dynamic.common;
23
24 import org.jboss.aop.joinpoint.FieldInvocation;
25 import org.jboss.aop.joinpoint.FieldReadInvocation;
26 import org.jboss.aop.joinpoint.FieldWriteInvocation;
27 import org.jboss.aop.joinpoint.Invocation;
28 import org.jboss.aop.joinpoint.ConstructorInvocation;
29 import org.jboss.aop.joinpoint.MethodInvocation;
30 import org.jboss.aop.advice.Interceptor;
31
32 /**
33  * Instance interceptor. Is used by dynamic test cases
34  * for interception of joinpoints. This interception
35  * is achieved through the dynamic addition of this interceptor
36  * to the interceptor chain of a ClassInstanceAdvisor.
37  * @author Flavia Rainone
38  */
39 public class InstanceInterceptor implements Interceptor
40 {
41    private static InterceptionsCount interceptionsCount = new InterceptionsCount();
42    
43    /**
44     * Returns the total number of times that any instance
45     * of this class intercepted a joinpoint, since the
46     * last time that resetCounts was called.
47     */
48    public static InterceptionsCount getInterceptionsCount()
49    {
50       return interceptionsCount;
51    }
52
53    /**
54     * Resets the counting of interceptions to zero.
55     */
56    public static void resetCounts()
57    {
58       interceptionsCount = new InterceptionsCount();
59    }
60    
61    /**
62     * Returns the name of this interceptor.
63     */
64    public String JavaDoc getName() { return "InstanceInterceptor"; }
65
66    /**
67     * Intercepts the joinpoint represented by <code>invocation</code>.
68     */
69    public Object JavaDoc invoke(Invocation invocation) throws Throwable JavaDoc
70    {
71       interceptionsCount.total++;
72       if (invocation instanceof ConstructorInvocation)
73       {
74          interceptionsCount.constructor++;
75       }
76       else if (invocation instanceof FieldInvocation)
77       {
78          if (invocation instanceof FieldReadInvocation)
79          {
80             // never track runner access, because this field is accessed inside finalize method,
81 // which we don't know whether is executed
82 if (!((FieldReadInvocation) invocation).getField().getName().equals("runner"))
83             {
84                interceptionsCount.fieldRead++;
85             }
86             else
87             {
88                interceptionsCount.total--;
89             }
90             
91          }
92          else if (invocation instanceof FieldWriteInvocation)
93          {
94             // never track runner reads, just for the sake of uniformity (runner reads aren't tracked)
95 if (!((FieldWriteInvocation) invocation).getField().getName().equals("runner"))
96             {
97                interceptionsCount.fieldWrite++;
98             }
99             else
100             {
101                interceptionsCount.total--;
102             }
103          }
104          else
105          {
106             throw new RuntimeException JavaDoc("Unexpected invocation type invalidates test correction.");
107          }
108       }
109       else if (invocation instanceof MethodInvocation)
110       {
111          // never track finalize executions, because we don't know whether they are executed
112 if (!((MethodInvocation) invocation).getMethod().getName().equals("finalize"))
113          {
114             interceptionsCount.method++;
115          }
116          else
117          {
118             interceptionsCount.total--;
119          }
120       }
121       return invocation.invokeNext();
122    }
123 }
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