private static Map<String, ClassLoader> createClassLoaders(ContainerConfig config)
throws MalformedURLException {
Map<String, ClassLoader> classLoaders = new HashMap<String, ClassLoader>();
classLoaders.put(Strings.BOOTSTRAP_CLASS_LOADER, Bootstrap.class.getClassLoader());
/*
Setup the classloaders according to the config file.
*/
List<String> seen = new LinkedList<String>();
Map<String, Classpath> classpaths = new HashMap<String, Classpath>();
for (Classpath classpath : config.getClasspath()) {
if (classpaths.containsKey(classpath.getId())) {
throw new ConfigurationException(MessageNames.DUPLICATE_CLASSPATH, classpath.getId());
}
classpaths.put(classpath.getId(), classpath);
}
for (String id : classpaths.keySet()) {
resolveClassLoader(classLoaders, seen, classpaths, id);
}
return classLoaders;
}
private static ClassLoader resolveClassLoader(
Map<String, ClassLoader> classLoaders,
List<String> seen,
Map<String, Classpath> classpaths,
String id)
throws MalformedURLException {
if (classLoaders.containsKey(id)) {
return classLoaders.get(id);
}
if (seen.contains(id)) {
throw new ConfigurationException(MessageNames.CIRCULAR_CLASSPATH, id);
}
// Add the id to the list of classloaders we have attempted to build.
seen.add(id);
Classpath classpath = classpaths.get(id);
if (classpath == null) {
throw new ConfigurationException(MessageNames.CLASSPATH_UNDEFINED, id);
}
String parentClasspathId = classpath.getParent();
ClassLoader parentClassLoader = null;
if (parentClasspathId != null && !Strings.EMPTY.equals(parentClasspathId)) {
parentClassLoader = resolveClassLoader(classLoaders, seen, classpaths, parentClasspathId);
} else {
/* Should be the 'extension' classloader. */
parentClassLoader = Bootstrap.class.getClassLoader().getParent();
}
URL[] classpathUrls;
classpathUrls = findClasspathURLS(classpath.getValue());
SettableCodebaseClassLoader classLoader =
new SettableCodebaseClassLoader(classpathUrls, parentClassLoader);
classLoaders.put(id, classLoader);
log.log(
Level.FINE,
MessageNames.CONFIGURED_CLASSPATH,
new Object[] {id, Utils.format(classpathUrls)});
seen.remove(id);
return classLoader;
}