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

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


        @Override
        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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        @Override
        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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import java.lang.instrument.UnmodifiableClassException;
import java.util.Map;


public class InstrumentationRedefiner implements Redefiner {
    public void redefineClasses(Map<Class<?>, byte[]> classes) throws ClassNotFoundException, UnmodifiableClassException {
        Instrumentation instrumentation = InstrumentationAgent.INSTRUMENTATION;
        if (instrumentation == null) {
            throw new IllegalStateException("Instrumentation agent is not properly installed!");
        }


        ClassDefinition[] definitions = new ClassDefinition[classes.size()];
        int i = 0;
        for (Map.Entry<Class<?>, byte[]> entry : classes.entrySet()) {
            definitions[i++] = new ClassDefinition(entry.getKey(), entry.getValue());
        }
        instrumentation.redefineClasses(definitions);
    }

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        MemoryMeter mm = new MemoryMeter();


        Field instrumentationField = MemoryMeter.class.getDeclaredField( "instrumentation" );//We need to access it using reflection
        instrumentationField.setAccessible( true );


        Instrumentation instrumentation = (Instrumentation) instrumentationField.get( mm );


        instrumentationField.setAccessible( false );


        return instrumentation;
    }

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


        @Override
        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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        @Override
        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 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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