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 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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    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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            }
        };


        getLogger().info("*** Adding transformer: " + transformer);


        Instrumentation i = InstrumentUtil.getInstrumentation();
        if (i == null) {
            throw new IllegalStateException("Attempt to add a transformer failed - "
                    + "instrumentation is not initialized.");
        }


        i.addTransformer(transformerWrapper);
    }

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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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public class PurrPackagePremainTest extends Assert {


    @Test
    public void testPremain() {
        Instrumentation i = EasyMock.createMock( Instrumentation.class );
        i.addTransformer( EasyMock.anyObject( SimpleInstrumenter.class ) );
        EasyMock.expectLastCall();
        EasyMock.replay( i );
        PurrPackagePremain.premain( null, i );
        EasyMock.verify( i );
    }

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 */
public class InstrumentationLoadTimeWeaver implements LoadTimeWeaver {


  public void addTransformer(ClassFileTransformer transformer) {
    Assert.notNull(transformer, "Transformer must not be null");
    Instrumentation instrumentation = InstrumentationSavingAgent.getInstrumentation();
    if (instrumentation == null) {
      throw new IllegalStateException(
          "Must start with Java agent to use InstrumentationLoadTimeWeaver. See Spring documentation.");
    }
    instrumentation.addTransformer(transformer);
  }

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 */
public class InstrumentationLoadTimeWeaver implements LoadTimeWeaver {


  public void addTransformer(ClassFileTransformer transformer) {
    Assert.notNull(transformer, "Transformer must not be null");
    Instrumentation instrumentation = InstrumentationSavingAgent.getInstrumentation();
    if (instrumentation == null) {
      throw new IllegalStateException(
          "Must start with Java agent to use InstrumentationLoadTimeWeaver. See Spring documentation.");
    }
    instrumentation.addTransformer(transformer);
  }

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    // hotswap (ClassDefinition[] defns, Boolean[]succeeded)


    public void hotswap (ClassDefinition[] changes, Boolean[] succeeded)
    {
        Instrumentation instrumentation = Agent.getInstrumentation();
        if (!instrumentation.isRedefineClassesSupported()) {
            //TODO - should we fail ?
            return;
        }


        // try to reload them all
        try {
            instrumentation.redefineClasses(changes);
            for (int i=0; i<changes.length; i++) succeeded[i] = true;
        } catch (Exception e) {
            // throw new AWGenericException(e);
            if (changes.length == 1) {
                succeeded[0] = false;
            } else {
                // we failed to load one or more, so try to load them individually
                for (int i=0; i<changes.length; i++) {
                    ClassDefinition[] change = new ClassDefinition[] {changes[i]};
                    try {
                        instrumentation.redefineClasses(change);
                        succeeded[i] = true;
                    } catch (Exception e2) {
                        succeeded[i] = false;
                    }
                }

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