import java.io.IOException;
import java.io.InputStream;
-import java.lang.ref.Reference;
-import java.lang.ref.SoftReference;
import java.net.URL;
import java.net.URLClassLoader;
-import java.util.HashMap;
-import java.util.Map;
import java.util.WeakHashMap;
import org.aspectj.apache.bcel.classfile.ClassParser;
*
* @see org.aspectj.apache.bcel.Repository
*
- * @version $Id: ClassLoaderRepository.java,v 1.7 2006/08/18 14:51:00 acolyer Exp $
+ * @version $Id: ClassLoaderRepository.java,v 1.5.2.1 2006/08/18 18:23:03 acolyer Exp $
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
* @author David Dixon-Peugh
*/
-public class ClassLoaderRepository implements Repository {
+public class ClassLoaderRepository
+ implements Repository
+{
private static java.lang.ClassLoader bootClassLoader = null;
+
private java.lang.ClassLoader loader;
- private WeakHashMap /*<String classname,JavaClass>*/loadedClassesLocalCache = new WeakHashMap();
- private static Map /*<URL,JavaClass>*/loadedUrlsSharedCache = new HashMap();
- public static boolean useSharedCache = true;
-
- private static long timeManipulatingURLs = 0L;
- private static long timeSpentLoading = 0L;
- private static int classesLoadedCount = 0;
- private static int cacheHitsShared = 0;
- private static int missSharedEvicted = 0; // Misses in shared cache access due to reference GC
- private static int misses = 0;
- private int cacheHitsLocal = 0;
- private int missLocalEvicted = 0; // Misses in local cache access due to reference GC
+ private WeakHashMap loadedClasses =
+ new WeakHashMap(); // CLASSNAME X JAVACLASS
- static {
- useSharedCache = System.getProperty("org.aspectj.apache.bcel.useSharedCache","true").equalsIgnoreCase("true");
- }
-
public ClassLoaderRepository( java.lang.ClassLoader loader ) {
- this.loader = (loader != null) ? loader : getBootClassLoader();
+ this.loader = (loader != null) ? loader : getBootClassLoader();
}
-
+
private static synchronized java.lang.ClassLoader getBootClassLoader() {
if (bootClassLoader == null) {
bootClassLoader = new URLClassLoader(new URL[0]);
}
return bootClassLoader;
}
-
- /**
- * Store a new JavaClass into this repository as a soft reference and return the reference
- */
- private Reference storeClassAsReference( JavaClass clazz ) {
- Reference ref = new SoftReference(clazz);
- loadedClassesLocalCache.put( clazz.getClassName(), ref);
- clazz.setRepository( this );
- return ref;
- }
- /**
- * Store a reference in the shared cache
- */
- private void storeReferenceShared(URL url, Reference ref) {
- if (useSharedCache) loadedUrlsSharedCache.put(url, ref);
- }
-
/**
* Store a new JavaClass into this Repository.
*/
public void storeClass( JavaClass clazz ) {
- storeClassAsReference(clazz);
+ loadedClasses.put( clazz.getClassName(),
+ clazz );
+ clazz.setRepository( this );
}
/**
* Remove class from repository
*/
public void removeClass(JavaClass clazz) {
- loadedClassesLocalCache.remove(clazz.getClassName());
+ loadedClasses.remove(clazz.getClassName());
}
/**
- * Find an already defined JavaClass in the local cache.
+ * Find an already defined JavaClass.
*/
public JavaClass findClass( String className ) {
- Object o = loadedClassesLocalCache.get( className );
- if (o != null) {
- o = ((Reference)o).get();
- if (o != null) {
- return (JavaClass)o;
- } else {
- missLocalEvicted++;
- }
+ if ( loadedClasses.containsKey( className )) {
+ return (JavaClass) loadedClasses.get( className );
+ } else {
+ return null;
}
- return null;
- }
-
- /**
- * Find an already defined JavaClass in the shared cache.
- */
- private JavaClass findClassShared(URL url) {
- if (!useSharedCache) return null;
- Object o = (Reference)loadedUrlsSharedCache.get(url);
- if (o != null) {
- o = ((Reference)o).get();
- if (o != null) {
- return (JavaClass)o;
- } else {
- missSharedEvicted++;
- }
- }
- return null;
}
-
/**
* Lookup a JavaClass object from the Class Name provided.
*/
- public JavaClass loadClass( String className ) throws ClassNotFoundException {
+ public JavaClass loadClass( String className )
+ throws ClassNotFoundException
+ {
String classFile = className.replace('.', '/');
- // Check the local cache
- JavaClass clazz = findClass(className);
- if (clazz != null) { cacheHitsLocal++; return clazz; }
+ JavaClass RC = findClass( className );
+ if (RC != null) { return RC; }
try {
- // Work out the URL
- long time = System.currentTimeMillis();
- java.net.URL url = (useSharedCache?loader.getResource( classFile + ".class" ):null);
- if (useSharedCache && url==null) throw new ClassNotFoundException(className + " not found.");
- InputStream is = (useSharedCache?url.openStream():loader.getResourceAsStream( classFile + ".class" ));
- timeManipulatingURLs += (System.currentTimeMillis() - time);
-
- // Check the shared cache
- clazz = findClassShared(url);
- if (clazz != null) { cacheHitsShared++; timeSpentLoading+=(System.currentTimeMillis() - time); return clazz; }
-
- // Didn't find it in either cache
- misses++;
+ InputStream is =
+ loader.getResourceAsStream( classFile + ".class" );
- if (is == null) { // TODO move this up?
- throw new ClassNotFoundException(className + " not found.");
- }
+ if(is == null) {
+ throw new ClassNotFoundException(className + " not found.");
+ }
- ClassParser parser = new ClassParser( is, className );
- clazz = parser.parse();
+ ClassParser parser = new ClassParser( is, className );
+ RC = parser.parse();
- // Store it in both caches
- Reference ref = storeClassAsReference( clazz );
- storeReferenceShared(url,ref);
+ storeClass( RC );
- timeSpentLoading += (System.currentTimeMillis() - time);
- classesLoadedCount++;
- return clazz;
+ return RC;
} catch (IOException e) {
throw new ClassNotFoundException( e.toString() );
}
}
-
-
-/**
- * Produce a report on cache usage.
- */
- public String reportAllStatistics() {
- StringBuffer sb = new StringBuffer();
- sb.append("BCEL repository report.");
- if (!useSharedCache) sb.append(" (Shared cache deactivated)");
- sb.append(" Total time spent loading: "+timeSpentLoading+"ms.");
- sb.append(" Time manipulating URLs: "+timeManipulatingURLs+"ms.");
- sb.append(" Classes loaded: "+classesLoadedCount+".");
- if (useSharedCache) sb.append(" URL cache (hits/missDueToEviction): ("+cacheHitsShared+"/"+missSharedEvicted+").");
- sb.append(" Local cache (hits/missDueToEviction): ("+cacheHitsLocal+"/"+missLocalEvicted+").");
- return sb.toString();
- }
-
- public int reportLocalCacheHits() {
- return cacheHitsLocal;
- }
- public static int reportSharedCacheHits() {
- return cacheHitsShared;
- }
-
- /**
- * Reset statistics and clear all caches
- */
- public void reset() {
- timeManipulatingURLs = 0L;
- timeSpentLoading = 0L;
- classesLoadedCount = 0;
- cacheHitsLocal = 0;
- cacheHitsShared = 0;
- missSharedEvicted = 0;
- missLocalEvicted = 0;
- misses = 0;
- clear();
- clearShared();
- }
-
-
public JavaClass loadClass(Class clazz) throws ClassNotFoundException {
return loadClass(clazz.getName());
}
- /** Clear all entries from the local cache */
+ /** Clear all entries from cache.
+ */
public void clear() {
- loadedClassesLocalCache.clear();
- }
-
- /** Clear all entries from the shared cache */
- public static void clearShared() {
- loadedUrlsSharedCache.clear();
+ loadedClasses.clear();
}
}
projects / aspectj.git / commitdiff