Package java.lang.instrument

Examples of java.lang.instrument.ClassFileTransformer

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    public static void premain(
        final String agentArgs,
        final Instrumentation inst)
    {
        inst.addTransformer(new ClassFileTransformer() {
            public byte[] transform(
                final ClassLoader loader,
                final String className,
                final Class classBeingRedefined,
                final ProtectionDomain domain,
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      for (String className : classes) {
        bw.write(className);
        bw.write("\n");
      }
      bw.close();
      inst.addTransformer(new ClassFileTransformer() {
        @Override
        public byte[] transform(ClassLoader classLoader, String s, Class<?> aClass, ProtectionDomain protectionDomain, byte[] bytes) throws IllegalClassFormatException {
          if (skip(s)) return null;
          String name = s.replace("/", ".");
          if (classes.contains(name)) return null;
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    }
   
    StatisticReporter rep = new StatisticReporter();
    rep.start();
   
    ClassFileTransformer trans = new EurekaJTransformer();
    instrumentation.addTransformer(trans);
  }
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            EntityMapLoader loader = new EntityMapLoader(unit);

            // add transformer before DataMapConverter starts loading the classes via app
            // class loader
            ClassFileTransformer enhancer = new Enhancer(new JpaEnhancerVisitorFactory(
                    loader.getEntityMap()));
            Map<String, JpaClassDescriptor> managedClasses = loader
                    .getEntityMap()
                    .getManagedClasses();
            unit.addTransformer(new UnitClassTransformer(managedClasses, loader
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    @Test
    public void testClassFileTranslations() throws Exception
    {
        final List<Object> results=new ArrayList<Object>();
       
        _loader.addTransformer(new ClassFileTransformer()
        {
            public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer)
                    throws IllegalClassFormatException
            {
                results.add(loader);
                byte[] b = new byte[classfileBuffer.length];
                for (int i=0;i<classfileBuffer.length;i++)
                    b[i]=(byte)(classfileBuffer[i]^0xff);
                return b;
            }
        });
        _loader.addTransformer(new ClassFileTransformer()
        {
            public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer)
                    throws IllegalClassFormatException
            {
                results.add(className);
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            public ClassLoader getNewTempClassLoader(ClassLoader classLoader) {
                return new TempClassLoader(classLoader);
            }
        };

        Agent.getInstrumentation().addTransformer(new ClassFileTransformer() {
            public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) {
                if (!className.equals("org/apache/openejb/core/cmp/jpa/Employee")) {
                    return null;
                }
                byte[] newBytes = addNewField(classfileBuffer);
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            // add transformer before DataMapConverter starts loading the classes via app
            // class loader
            Map<String, JpaClassDescriptor> managedClasses = loader
                    .getEntityMap()
                    .getMangedClasses();
            ClassFileTransformer enhancer = new Enhancer(new JpaEnhancerVisitorFactory(
                    managedClasses));
            unit.addTransformer(new UnitClassTransformer(managedClasses, loader
                    .getContext()
                    .getTempClassLoader(), enhancer));
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        byte[]  bufferToUse = classfileBuffer;

        // order matters, gotta run 'em in the order they were added
        for ( int x = 0; x < transformerList.length; x++ ) {
            TransformerInfo         transformerInfo = transformerList[x];
            ClassFileTransformer    transformer = transformerInfo.transformer();
            byte[]                  transformedBytes = null;

            try {
                transformedBytes = transformer.transform(   loader,
                                                            classname,
                                                            classBeingRedefined,
                                                            protectionDomain,
                                                            bufferToUse);
            }
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    setNativeMethodPrefix(ClassFileTransformer transformer, String prefix) {
        TransformerInfo[]  transformerList = getSnapshotTransformerList();

        for ( int x = 0; x < transformerList.length; x++ ) {
            TransformerInfo         transformerInfo = transformerList[x];
            ClassFileTransformer    aTransformer = transformerInfo.transformer();

            if ( aTransformer == transformer ) {
                transformerInfo.setPrefix(prefix);
                return true;
            }
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    }

    static void install(String agentArgs, Instrumentation inst) {
        logger.warning("[MtContextAgent.install] agentArgs: " + agentArgs + ", Instrumentation: " + inst);

        ClassFileTransformer transformer = new MtContextTransformer();
        inst.addTransformer(transformer, true);

        logger.warning("[MtContextAgent.install] addTransformer success.");
    }
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