/*

 * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLClassLoader;

import java.util.concurrent.ConcurrentHashMap;

import java.util.concurrent.locks.*;

import java.lang.reflect.*;

public class DelegatingLoader extends URLClassLoader {

    private DelegatingLoader delLoader;

    private String[] delClasses;

    static {

        boolean supportParallel = false;

        try {

            Class c = Class.forName("java.lang.ClassLoader");

            Method m = c.getDeclaredMethod("registerAsParallelCapable",

                    new Class[0]);

            m.setAccessible(true);

            Object result = (Boolean) m.invoke(null);

            if (result instanceof Boolean) {

                supportParallel = ((Boolean) result).booleanValue();

            } else {

                // Should never happen

                System.out.println("Error: ClassLoader.registerAsParallelCapable() did not return a boolean!");

                System.exit(1);

            }

        } catch (NoSuchMethodException nsme) {

            System.out.println("No ClassLoader.registerAsParallelCapable() API");

        } catch (NoSuchMethodError nsme2) {

            System.out.println("No ClassLoader.registerAsParallelCapable() API");

        } catch (Exception ex) {

            ex.printStackTrace();

            // Exit immediately to indicate an error

            System.exit(1);

        }

        System.out.println("Parallel ClassLoader registration: " +

                    supportParallel);

    }

    public DelegatingLoader(URL urls[]) {

        super(urls);

        System.out.println("DelegatingLoader using URL " + urls[0]);

    }

    public void setDelegate(String[] delClasses, DelegatingLoader delLoader) {

        this.delClasses = delClasses;

        this.delLoader = delLoader;

    }

    public Class loadClass(String className, boolean resolve)

            throws ClassNotFoundException {

        for (int i = 0; i < delClasses.length; i++) {

            if (delClasses[i].equals(className)) {

                Starter.log("Delegating class loading for " + className);

                try {

                    Thread.sleep(500);

                } catch (InterruptedException ie) {

                    return null;

                }

                return delLoader.loadClass(className, resolve);

            }

        }

        Starter.log("Loading local class " + className);

//        synchronized (getClassLoadingLock(className)) {

            return super.loadClass(className, resolve);

//        }

    }

}