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package org.glassfish.api.deployment;

import java.lang.instrument.ClassFileTransformer;

/**
 * Providers of class loaders for GlassFish applications can optionally implements this interface
 * to indicate their class loader is capable of byte code enhancement.
 *
 * @author Persistence Team
 */
public interface InstrumentableClassLoader {

    /**
     * Create and return a temporary loader with the same visibility
     * as this loader. The temporary loader may be used to load
     * resources or any other application classes for the purposes of
     * introspecting them for annotations. The persistence provider
     * should not maintain any references to the temporary loader,
     * or any objects loaded by it.
     *
     * @return A temporary classloader with the same classpath as this loader
     */
    public ClassLoader copy();    

    /**
     * Add a new ClassFileTransformer to this class loader. This transfomer should be called for
     * each class loading event.
     *
     * @param transformer new class file transformer to do byte code enhancement.
     */
    public void addTransformer(ClassFileTransformer transformer);

}