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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.netbeans;
import java.lang.instrument.ClassDefinition;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.lang.instrument.Instrumentation;
import java.lang.instrument.UnmodifiableClassException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.ProtectionDomain;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.jar.JarFile;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.openide.util.WeakSet;
/**
*
* @author Jaroslav Tulach
*/
final class NbInstrumentation implements Instrumentation {
private static final Logger LOG = Logger.getLogger(NbInstrumentation.class.getName());
private static final Object LOCK = new Object();
private static volatile Collection ACTIVE;
private final List transformers = new CopyOnWriteArrayList();
private static final ThreadLocal IN = new ThreadLocal();
static NbInstrumentation registerAgent(ClassLoader l, String agentClassName) {
try {
return registerImpl(agentClassName, l);
} catch (Throwable ex) {
LOG.log(Level.WARNING, "Cannot register " + agentClassName, ex);
return null;
}
}
static void unregisterAgent(NbInstrumentation instr) {
synchronized (LOCK) {
if (ACTIVE != null) {
Collection clone = new WeakSet(ACTIVE);
clone.remove(instr);
ACTIVE = clone;
}
}
}
private static NbInstrumentation registerImpl(String agentClassName, ClassLoader l) throws ClassNotFoundException, IllegalArgumentException, NoSuchMethodException, SecurityException, IllegalAccessException, InvocationTargetException {
final NbInstrumentation inst = new NbInstrumentation();
synchronized (LOCK) {
if (ACTIVE == null) {
ACTIVE = new WeakSet();
} else {
ACTIVE = new WeakSet(ACTIVE);
}
ACTIVE.add(inst);
}
Class agentClass = Class.forName(agentClassName, true, l);
try {
Method m = agentClass.getMethod("agentmain", String.class, Instrumentation.class); // NOI18N
m.invoke(null, "", inst);
} catch (NoSuchMethodException ex) {
Method m = agentClass.getMethod("agentmain", String.class); // NOI18N
m.invoke(null, "");
}
return inst;
}
public static byte[] patchByteCode(ClassLoader l, String className, ProtectionDomain pd, byte[] arr) throws IllegalClassFormatException {
if (ACTIVE == null) {
return arr;
}
if (Boolean.TRUE.equals(IN.get())) {
return arr;
}
try {
IN.set(Boolean.TRUE);
for (NbInstrumentation inst : ACTIVE) {
for (ClassFileTransformer t : inst.transformers) {
arr = t.transform(l, className, null, pd, arr);
}
}
} finally {
IN.set(null);
}
return arr;
}
//
// Instrumentation methods
//
@Override
public void addTransformer(ClassFileTransformer transformer, boolean canRetransform) {
transformers.add(transformer);
}
@Override
public void addTransformer(ClassFileTransformer transformer) {
transformers.add(transformer);
}
@Override
public boolean removeTransformer(ClassFileTransformer transformer) {
return transformers.remove(transformer);
}
@Override
public boolean isRetransformClassesSupported() {
return false;
}
@Override
public void retransformClasses(Class... classes) throws UnmodifiableClassException {
throw new UnmodifiableClassException();
}
@Override
public boolean isRedefineClassesSupported() {
return false;
}
@Override
public void redefineClasses(ClassDefinition... definitions) throws ClassNotFoundException, UnmodifiableClassException {
throw new UnmodifiableClassException();
}
@Override
public boolean isModifiableClass(Class theClass) {
return false;
}
@Override
public Class[] getAllLoadedClasses() {
return new Class[0];
}
@Override
public Class[] getInitiatedClasses(ClassLoader loader) {
return new Class[0];
}
@Override
public long getObjectSize(Object objectToSize) {
return 42;
}
@Override
public void appendToBootstrapClassLoaderSearch(JarFile jarfile) {
}
@Override
public void appendToSystemClassLoaderSearch(JarFile jarfile) {
throw new UnsupportedOperationException();
}
@Override
public boolean isNativeMethodPrefixSupported() {
return false;
}
@Override
public void setNativeMethodPrefix(ClassFileTransformer transformer, String prefix) {
throw new UnsupportedOperationException();
}
public void redefineModule(java.lang.Module module, Set extraReads, Map> extraExports, Map> extraOpens, Set> extraUses, Map, List>> extraProvides) {
throw new UnsupportedOperationException();
}
public boolean isModifiableModule(java.lang.Module module) {
return false;
}
}
