ClassLoaderPatcher.java

package org.hotswap.agent.util.classloader;

import java.security.ProtectionDomain;

/**
 * Add agent classloader plugin classes to the application classloader.
 * <p/>
 * This is necessary to allow direct call of app classes (typically library classes like Spring and Hibernate).
 * It is not possible to call class in child classloader from parent classloader. Hence this patch redefines
 * necessary classes in child classloader itself directly.
 *
 * @author Jiri Bubnik
 */
public interface ClassLoaderPatcher {

    /**
     * Check if the classloader can be patched.
     * Typically skip synthetic classloaders.
     *
     * @param classLoader classloader to check
     * @return if true, call patch()
     */
    boolean isPatchAvailable(ClassLoader classLoader);

    /**
     * Patch the classloader.
     *
     * @param classLoaderFrom  classloader to load classes from
     * @param path             path to copy
     * @param classLoaderTo    classloader to copy classes to
     * @param protectionDomain required protection in target classloader
     */
    void patch(ClassLoader classLoaderFrom, String path, ClassLoader classLoaderTo, ProtectionDomain protectionDomain);
}