Coverage Report - org.mule.registry.ClassLoaderFactory
 
Classes in this File Line Coverage Branch Coverage Complexity
ClassLoaderFactory
0%
0/26
0%
0/4
2.5
ClassLoaderFactory$DelegatingClassLoader
0%
0/13
0%
0/2
2.5
ClassLoaderFactory$JbiClassLoader
0%
0/17
0%
0/3
2.5
 
 1  
 /*
 2  
  * $Id: ClassLoaderFactory.java 7976 2007-08-21 14:26:13Z dirk.olmes $
 3  
  * --------------------------------------------------------------------------------------
 4  
  * Copyright (c) MuleSource, Inc.  All rights reserved.  http://www.mulesource.com
 5  
  *
 6  
  * The software in this package is published under the terms of the CPAL v1.0
 7  
  * license, a copy of which has been included with this distribution in the
 8  
  * LICENSE.txt file.
 9  
  */
 10  
 
 11  
 package org.mule.registry;
 12  
 
 13  
 import org.mule.util.FileUtils;
 14  
 
 15  
 import java.net.MalformedURLException;
 16  
 import java.net.URL;
 17  
 import java.net.URLClassLoader;
 18  
 import java.security.SecureClassLoader;
 19  
 import java.util.ArrayList;
 20  
 import java.util.HashMap;
 21  
 import java.util.Iterator;
 22  
 import java.util.List;
 23  
 import java.util.Map;
 24  
 
 25  
 /**
 26  
  * @author <a href="mailto:gnt@codehaus.org">Guillaume Nodet</a>
 27  
  */
 28  
 public class ClassLoaderFactory
 29  
 {
 30  
 
 31  
     private static ClassLoaderFactory factory;
 32  
     private Map sharedClassLoaders;
 33  
 
 34  
     public static ClassLoaderFactory getInstance()
 35  
     {
 36  0
         if (factory == null)
 37  
         {
 38  0
             factory = new ClassLoaderFactory();
 39  
         }
 40  0
         return factory;
 41  
     }
 42  
 
 43  
     private ClassLoaderFactory()
 44  0
     {
 45  0
         this.sharedClassLoaders = new HashMap();
 46  0
     }
 47  
 
 48  
     public ClassLoader createComponentClassLoader(RegistryComponent component) throws MalformedURLException
 49  
     {
 50  0
         DelegatingClassLoader dcl = new DelegatingClassLoader();
 51  0
         Library[] libraries = component.getLibraries();
 52  0
         for (int i = 0; i < libraries.length; i++)
 53  
         {
 54  0
             dcl.addClassLoader(getSharedClassLoader(libraries[i]));
 55  
         }
 56  0
         URL[] urls = getUrlsFrom(component.getInstallRoot(), component.getClassPathElements());
 57  0
         boolean isParentFirst = component.isClassLoaderParentFirst();
 58  0
         JbiClassLoader ccl = new JbiClassLoader(urls, dcl, isParentFirst);
 59  0
         return ccl;
 60  
     }
 61  
 
 62  
     private ClassLoader getSharedClassLoader(Library library) throws MalformedURLException
 63  
     {
 64  0
         ClassLoader cl = (ClassLoader)this.sharedClassLoaders.get(library.getName());
 65  0
         if (cl == null)
 66  
         {
 67  0
             URL[] urls = getUrlsFrom(library.getInstallRoot(), library.getClassPathElements());
 68  0
             boolean isParentFirst = library.isClassLoaderParentFirst();
 69  0
             cl = new JbiClassLoader(urls, null, isParentFirst);
 70  0
             this.sharedClassLoaders.put(library.getName(), cl);
 71  
         }
 72  0
         return cl;
 73  
     }
 74  
 
 75  
     private URL[] getUrlsFrom(String root, List paths) throws MalformedURLException
 76  
     {
 77  0
         URL[] urls = new URL[paths.size()];
 78  0
         for (int i = 0; i < urls.length; i++)
 79  
         {
 80  0
             String cpElement = (String)paths.get(i);
 81  0
             urls[i] = FileUtils.newFile(root, cpElement).toURL();
 82  
         }
 83  0
         return urls;
 84  
     }
 85  
 
 86  
     /**
 87  
      * ClassLoader for a component. This class loader is able to resolve class either
 88  
      * by first looking at the parent ot itself.
 89  
      * 
 90  
      * @author <a href="mailto:gnt@codehaus.org">Guillaume Nodet</a>
 91  
      */
 92  
     public static class JbiClassLoader extends URLClassLoader
 93  
     {
 94  
 
 95  
         private boolean parentFirst;
 96  
 
 97  
         public JbiClassLoader(URL[] urls, ClassLoader parent, boolean parentFirst)
 98  
         {
 99  0
             super(urls, parent);
 100  0
             this.parentFirst = parentFirst;
 101  0
         }
 102  
 
 103  
         protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException
 104  
         {
 105  
             // First, check if the class has already been loaded
 106  0
             Class clazz = findLoadedClass(name);
 107  0
             if (clazz == null)
 108  
             {
 109  0
                 if (this.parentFirst)
 110  
                 {
 111  
                     try
 112  
                     {
 113  0
                         clazz = getParent().loadClass(name);
 114  
                     }
 115  0
                     catch (ClassNotFoundException cnfe)
 116  
                     {
 117  0
                         clazz = findClass(name);
 118  0
                     }
 119  
                 }
 120  
                 else
 121  
                 {
 122  
                     try
 123  
                     {
 124  0
                         clazz = findClass(name);
 125  
                     }
 126  0
                     catch (ClassNotFoundException e)
 127  
                     {
 128  0
                         clazz = getParent().loadClass(name);
 129  0
                     }
 130  
                 }
 131  
             }
 132  0
             if (resolve)
 133  
             {
 134  0
                 resolveClass(clazz);
 135  
             }
 136  0
             return clazz;
 137  
         }
 138  
     }
 139  
 
 140  
     /**
 141  
      * ClassLoader for shared libraries
 142  
      * 
 143  
      * @author <a href="mailto:gnt@codehaus.org">Guillaume Nodet</a>
 144  
      */
 145  
     public static class DelegatingClassLoader extends SecureClassLoader
 146  
     {
 147  
         private List loaders;
 148  
 
 149  
         public DelegatingClassLoader()
 150  0
         {
 151  0
             this.loaders = new ArrayList();
 152  0
         }
 153  
 
 154  
         public void addClassLoader(ClassLoader loader)
 155  
         {
 156  0
             if (loader == null)
 157  
             {
 158  0
                 throw new IllegalArgumentException("loader can not be null");
 159  
             }
 160  0
             loaders.add(loader);
 161  0
         }
 162  
 
 163  
         protected Class findClass(String name) throws ClassNotFoundException
 164  
         {
 165  0
             for (Iterator iter = this.loaders.iterator(); iter.hasNext();)
 166  
             {
 167  0
                 ClassLoader loader = (ClassLoader)iter.next();
 168  
                 try
 169  
                 {
 170  0
                     return loader.loadClass(name);
 171  
                 }
 172  0
                 catch (ClassNotFoundException e)
 173  
                 {
 174  
                     // expected
 175  0
                 }
 176  
             }
 177  0
             throw new ClassNotFoundException(name);
 178  
         }
 179  
     }
 180  
 
 181  
 }