001/* 002 * (C) Copyright 2015 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * Stephane Lacoin 018 */ 019package org.nuxeo.webengine.gwt.codeserver; 020 021import java.io.IOException; 022import java.net.URI; 023import java.net.URISyntaxException; 024import java.net.URL; 025import java.net.URLClassLoader; 026import java.nio.file.FileSystemNotFoundException; 027import java.nio.file.FileSystems; 028import java.nio.file.Files; 029import java.nio.file.Path; 030import java.nio.file.Paths; 031import java.util.Collections; 032import java.util.HashMap; 033import java.util.Map; 034 035public class CodeServerLoader extends URLClassLoader { 036 037 CodeServerLoader(URL[] jars) { 038 super(jars, CodeServerLoader.class.getClassLoader()); 039 } 040 041 @Override 042 protected java.lang.Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException { 043 Class<?> clazz = findLoadedClass(name); 044 if (clazz != null) { 045 return clazz; 046 } 047 048 if (name.equals(CodeServerLauncher.class.getName())) { 049 return getParent().loadClass(name); 050 } 051 052 if (name.equals(CodeServerWrapper.class.getName())) { 053 try { 054 return reloadClass(CodeServerWrapper.class); 055 } catch (URISyntaxException | IOException cause) { 056 throw new ClassNotFoundException("Cannot reload wrapper in gwt dev class loader", cause); 057 } 058 } 059 try { 060 return ClassLoader.getSystemClassLoader().loadClass(name); 061 } catch (ClassNotFoundException cause) { 062 ; 063 } 064 synchronized (getClassLoadingLock(name)) { 065 clazz = findClass(name); 066 if (clazz != null) { 067 return clazz; 068 } 069 } 070 throw new ClassNotFoundException("Cannot find " + name + " in gwt class loader"); 071 }; 072 073 Class<?> reloadClass(Class<?> clazz) throws URISyntaxException, IOException { 074 URI location = clazz.getResource(clazz.getSimpleName().concat(".class")).toURI(); 075 byte[] content = Files.readAllBytes(getPath(location)); 076 return defineClass(clazz.getName(), content, 0, content.length); 077 } 078 079 private Path getPath(URI location) throws IOException { 080 try { 081 return Paths.get(location); 082 } catch (FileSystemNotFoundException cause) { 083 Map<String, Object> env = Collections.emptyMap(); 084 FileSystems.newFileSystem(location, env); 085 return Paths.get(location); 086 } 087 } 088 089 CodeServerLauncher load() throws ReflectiveOperationException { 090 return (CodeServerLauncher) loadClass(CodeServerWrapper.class.getName()).newInstance(); 091 } 092 093}