| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.webapp; |
| |
| import java.io.IOException; |
| import java.net.URL; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.eclipse.jetty.util.ConcurrentHashSet; |
| import org.eclipse.jetty.util.annotation.ManagedObject; |
| import org.eclipse.jetty.util.annotation.ManagedOperation; |
| |
| |
| /** |
| * A WebAppClassLoader that caches {@link #getResource(String)} results. |
| * Specifically this ClassLoader caches not found classes and resources, |
| * which can greatly increase performance for applications that search |
| * for resources. |
| */ |
| @ManagedObject |
| public class CachingWebAppClassLoader extends WebAppClassLoader |
| { |
| private final ConcurrentHashSet<String> _notFound = new ConcurrentHashSet<>(); |
| private final ConcurrentHashMap<String,URL> _cache = new ConcurrentHashMap<>(); |
| |
| public CachingWebAppClassLoader(ClassLoader parent, Context context) throws IOException |
| { |
| super(parent,context); |
| } |
| |
| public CachingWebAppClassLoader(Context context) throws IOException |
| { |
| super(context); |
| } |
| |
| @Override |
| public URL getResource(String name) |
| { |
| if (_notFound.contains(name)) |
| return null; |
| |
| URL url = _cache.get(name); |
| |
| if (name==null) |
| { |
| url = super.getResource(name); |
| |
| if (url==null) |
| { |
| _notFound.add(name); |
| } |
| else |
| { |
| _cache.putIfAbsent(name,url); |
| } |
| } |
| |
| return url; |
| } |
| |
| @Override |
| protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException |
| { |
| if (_notFound.contains(name)) |
| throw new ClassNotFoundException(name+": in notfound cache"); |
| try |
| { |
| return super.loadClass(name,resolve); |
| } |
| catch (ClassNotFoundException nfe) |
| { |
| _notFound.add(name); |
| throw nfe; |
| } |
| } |
| |
| @Override |
| protected Class<?> findClass(String name) throws ClassNotFoundException |
| { |
| if (_notFound.contains(name)) |
| throw new ClassNotFoundException(name+": in notfound cache"); |
| try |
| { |
| return super.findClass(name); |
| } |
| catch (ClassNotFoundException nfe) |
| { |
| _notFound.add(name); |
| throw nfe; |
| } |
| } |
| |
| @ManagedOperation |
| public void clearCache() |
| { |
| _cache.clear(); |
| _notFound.clear(); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "Caching["+super.toString()+"]"; |
| } |
| } |