Examples of java.lang.instrument.Instrumentation

java.lang.instrument.Instrumentation
This class provides services needed to instrument Java programming language code. Instrumentation is the addition of byte-codes to methods for the purpose of gathering data to be utilized by tools. Since the changes are purely additive, these tools do not modify application state or behavior. Examples of such benign tools include monitoring agents, profilers, coverage analyzers, and event loggers.
There are two ways to obtain an instance of the Instrumentation interface:
1. When a JVM is launched in a way that indicates an agent class. In that case an Instrumentation instance is passed to the premain method of the agent class.
2. When a JVM provides a mechanism to start agents sometime after the JVM is launched. In that case an Instrumentation instance is passed to the agentmain method of the agent code.
These mechanisms are described in the {@linkplain java.lang.instrument package specification}.
Once an agent acquires an Instrumentation instance, the agent may call methods on the instance at any time. @since 1.5

    }


    public static Instrumentation
    getInstrumentationOrThrow()
    {
        Instrumentation result = getInstrumentation();
        if ( result == null )
            {
            throw new NullPointerException("instrumentation instance not initialized");
            }
        return result;

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    private static class PersistenceClassLoaderHandlerImpl implements PersistenceClassLoaderHandler {
        private final Map<String,List<ClassFileTransformer>> transformers = new TreeMap<String,List<ClassFileTransformer>>();


        public void addTransformer(String unitId, ClassLoader classLoader, ClassFileTransformer classFileTransformer) {
            Instrumentation instrumentation = Agent.getInstrumentation();
            if (instrumentation != null) {
                instrumentation.addTransformer(classFileTransformer);


                if (unitId != null) {
                    List<ClassFileTransformer> transformers = this.transformers.get(unitId);
                    if (transformers == null) {
                        transformers = new ArrayList<ClassFileTransformer>(1);

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        }


        public void destroy(String unitId) {
            List<ClassFileTransformer> transformers = this.transformers.remove(unitId);
            if (transformers != null) {
                Instrumentation instrumentation = Agent.getInstrumentation();
                if (instrumentation != null) {
                    for (ClassFileTransformer transformer : transformers) {
                        instrumentation.removeTransformer(transformer);
                    }
                } else {
                    logger.error("assembler.noAgent");
                }
            }

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        ClassLoader loader = new FilteredChildFirstClassLoader(getClass().getClassLoader(), "org.apache.openejb.core.cmp.jpa");


        PersistenceClassLoaderHandler persistenceClassLoaderHandler = new PersistenceClassLoaderHandler() {


            public void addTransformer(String unitId, ClassLoader classLoader, ClassFileTransformer classFileTransformer) {
                Instrumentation instrumentation = Agent.getInstrumentation();
                if (instrumentation != null) {
                    instrumentation.addTransformer(new ControllableTransformer(classFileTransformer));
                }
            }


            public void destroy(String unitId) {
            }

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    private EntityManagerFactory createEntityManagerFactory() throws Exception {
        PersistenceClassLoaderHandler persistenceClassLoaderHandler = new PersistenceClassLoaderHandler() {


            public void addTransformer(String unitId, ClassLoader classLoader, ClassFileTransformer classFileTransformer) {
                Instrumentation instrumentation = Agent.getInstrumentation();
                instrumentation.addTransformer(classFileTransformer);
            }


            public void destroy(String unitId) {
            }

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     * @param log
     * @return True if the agent is loaded successfully
     */
    public static synchronized boolean loadDynamicAgent(Log log) {
        if (loadAttempted == false && disableDynamicAgent == false) {
            Instrumentation inst =
                InstrumentationFactory.getInstrumentation(log);
            if (inst != null) {
                premain("", inst);
                return true;
            }

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        }
    }


    private static class Handler implements PersistenceClassLoaderHandler {
        public void addTransformer(String unitId, ClassLoader classLoader, ClassFileTransformer classFileTransformer) {
            Instrumentation instrumentation = Agent.getInstrumentation();
            if (instrumentation != null) {
                instrumentation.addTransformer(new Transformer(classFileTransformer));
            }
        }

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     * if retransformation is possible.
     */
    public static boolean canRedefineClasses(Log log) {
        if (_canRedefine == null) {
            try {
                Instrumentation inst = InstrumentationFactory.getInstrumentation(log);
                if (inst == null) {
                    _canRedefine = Boolean.FALSE;
                } else if (JavaVersions.VERSION == 5) {
                    // if instrumentation is non-null and we're using Java 5,
                    // isRetransformClassesSupported isn't available,

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   * @param clazz
   * @param barr
   * @return
   */
  public static boolean redefineClassEL(Class clazz, byte[] barr){
    Instrumentation inst = InstrumentationFactory.getInstance();
      if(inst!=null && inst.isRedefineClassesSupported()) {
        try {
            inst.redefineClasses(new ClassDefinition(clazz,barr));
        return true;
      } 
        catch (Throwable t) {t.printStackTrace();}
      }
      return false;

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      }
      return false;
  }


  public static void redefineClass(Class clazz, byte[] barr) throws ClassNotFoundException, UnmodifiableClassException{
    Instrumentation inst = InstrumentationFactory.getInstance();
      inst.redefineClasses(new ClassDefinition(clazz,barr));
  }

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