Java Class Loader getClassLoaderForDirectory(final File baseFolder)

Description

get Class Loader For Directory

License

Open Source License

Declaration

private static ClassLoader getClassLoaderForDirectory(final File baseFolder) throws MalformedURLException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

public class Main {
    private static final ReadWriteLock LOCK = new ReentrantReadWriteLock();
    private static final Map<File, ClassLoader> CLASSLOADER_MAP = new ConcurrentHashMap<>(16);

    private static ClassLoader getClassLoaderForDirectory(final File baseFolder) throws MalformedURLException {
        final Lock readLock = LOCK.readLock();
        readLock.lock();//from   www  .  ja  va  2  s .  c om
        if (CLASSLOADER_MAP.containsKey(baseFolder)) {
            readLock.unlock();
            return CLASSLOADER_MAP.get(baseFolder);
        } else {
            final Lock writeLock = LOCK.writeLock();
            writeLock.lock();
            try {
                final URLClassLoader classLoader = URLClassLoader
                        .newInstance(new URL[] { baseFolder.toURI().toURL() });
                CLASSLOADER_MAP.put(baseFolder, classLoader);
                return classLoader;
            } finally {
                writeLock.unlock();
            }
        }
    }
}

Related

1. getClassInputStream(String className, ClassLoader cl)
2. getClassLoader()
3. getClassLoader(File[] directories)
4. getClassLoader(String path)
5. getClassLoaderForClass(final Class clazz)
6. getClassloaderRootDir(Class forClass)
7. getClassLoaders(ClassLoader baseClassLoader)
8. getClassLoaderStack(ClassLoader cl)
9. getClassLocation(Class clazz)