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org.springsource.loaded.jvm.JVM Maven / Gradle / Ivy
/*
* Copyright 2010-2012 VMware and contributors
*
* Licensed 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.springsource.loaded.jvm;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.springsource.loaded.ri.ReflectiveInterceptor;
/**
* Utility class containing operations that are "JVM" specific and may need porting when changing JVMs.
*
* @author Kris De Volder
* @since 0.5.0
*/
public class JVM {
public static Logger log = Logger.getLogger(JVM.class.getName());
@SuppressWarnings("unchecked")
private static Constructor jlrMethodCtor = (Constructor) Method.class.getDeclaredConstructors()[0];
private static Method jlrMethodCopy;
private static Field jlrMethodRootField;
static {
try {
jlrMethodCopy = Method.class.getDeclaredMethod("copy");
jlrMethodCopy.setAccessible(true);
}
catch (Exception e) {
log.log(Level.SEVERE, "Problems getting 'Method.copy()' method. Incompatible JVM?", e);
}
try {
jlrMethodRootField = Method.class.getDeclaredField("root");
jlrMethodRootField.setAccessible(true);
}
catch (Exception e) {
// Possibly on a JDK level that didn't have this?
}
}
private static Field jlrFieldRootField;
private static Method jlrFieldCopy;
static {
try {
jlrFieldCopy = Field.class.getDeclaredMethod("copy");
jlrFieldCopy.setAccessible(true);
}
catch (Exception e) {
log.log(Level.SEVERE, "Problems getting 'Field.copy()' method. Incompatible JVM?", e);
}
try {
jlrFieldRootField = Field.class.getDeclaredField("root");
jlrFieldRootField.setAccessible(true);
}
catch (Exception e) {
// Possibly on a JDK level that didn't have this?
}
}
private static Field jlrConstructorRootField;
private static Method jlrConstructorCopy;
static {
try {
jlrConstructorCopy = Constructor.class.getDeclaredMethod("copy");
jlrConstructorCopy.setAccessible(true);
}
catch (Exception e) {
log.log(Level.SEVERE, "Problems getting 'Constructor.copy()' method. Incompatible JVM?", e);
}
try {
jlrConstructorRootField = Constructor.class.getDeclaredField("root");
jlrConstructorRootField.setAccessible(true);
}
catch (Exception e) {
// Possibly on a JDK level that didn't have this?
}
}
private static Field jlrMethodModifiers;
static {
try {
jlrMethodModifiers = Method.class.getDeclaredField("modifiers");
jlrMethodModifiers.setAccessible(true);
}
catch (Exception e) {
log.log(Level.SEVERE, "Problems getting Field 'Method.modifiers' method. Incompatible JVM?", e);
}
}
private static Field jlrConstructorModifiers;
static {
try {
jlrConstructorModifiers = Constructor.class.getDeclaredField("modifiers");
jlrConstructorModifiers.setAccessible(true);
}
catch (Exception e) {
log.log(Level.SEVERE, "Problems getting Field 'Constructor.modifiers' method. Incompatible JVM?", e);
}
}
private static Field jlrFieldModifiers;
static {
try {
jlrFieldModifiers = Field.class.getDeclaredField("modifiers");
jlrFieldModifiers.setAccessible(true);
}
catch (Exception e) {
log.log(Level.SEVERE, "Problems getting Field 'Field.modifiers' method. Incompatible JVM?", e);
}
}
@SuppressWarnings("restriction")
public static void ensureMemberAccess(Class callerClass, Class declaringClass, Object target, int mods)
throws IllegalAccessException {
sun.reflect.Reflection.ensureMemberAccess(callerClass, declaringClass, target, mods);
}
/*
* Create a new Method object from scratch. This Method object is 'fake' and will not be "invokable". ReflectionInterceptor will
* be responsible to make sure user code calling 'invoke' on this object will be intercepted and handled appropriately.
*/
public static Method newMethod(Class clazz, String name, Class[] params, Class returnType,
Class[] exceptions,
int modifiers, String signature) {
// This is what the constructor looks like:
// Method(Class declaringClass, String name, Class[] parameterTypes, Class returnType,
// Class[] checkedExceptions, int modifiers, int slot, String signature,
// byte[] annotations, byte[] parameterAnnotations, byte[] annotationDefault)
Method returnMethod;
try {
jlrMethodCtor.setAccessible(true);
returnMethod = jlrMethodCtor.newInstance(clazz, name, params, returnType, exceptions, modifiers, 0,
signature, null,
null, null);
}
catch (Exception e) {
//This shouldn't happen...
ReflectiveInterceptor.log.log(Level.SEVERE, "Internal Error", e);
throw new Error(e);
}
return returnMethod;
}
/*
* Creates a copy of a method object that is equivalent to the original.
*/
public static Method copyMethod(Method method) {
try {
if (jlrMethodRootField != null) {
jlrMethodRootField.set(method, null);
}
return (Method) jlrMethodCopy.invoke(method);
}
catch (Exception e) {
log.log(Level.SEVERE, "Problems copying method. Incompatible JVM?", e);
return method; // return original as the best we can do
}
}
public static Field copyField(Field field) {
try {
if (jlrFieldRootField != null) {
jlrFieldRootField.set(field, null);
}
return (Field) jlrFieldCopy.invoke(field);
}
catch (Exception e) {
log.log(Level.SEVERE, "Problems copying field. Incompatible JVM?", e);
return field; // return original as the best we can do
}
}
public static Constructor copyConstructor(Constructor c) {
try {
if (jlrConstructorRootField != null) {
jlrConstructorRootField.set(c, null);
}
return (Constructor) jlrConstructorCopy.invoke(c);
}
catch (Exception e) {
log.log(Level.SEVERE, "Problems copying constructor. Incompatible JVM?", e);
return c; // return original as the best we can do
}
}
public static void setMethodModifiers(Method method, int modifiers) {
try {
jlrMethodModifiers.setInt(method, modifiers);
}
catch (Exception e) {
log.log(Level.SEVERE, "Couldn't set correct modifiers on reflected method: " + method, e);
}
}
public static void setConstructorModifiers(Constructor c, int modifiers) {
try {
jlrConstructorModifiers.setInt(c, modifiers);
}
catch (Exception e) {
log.log(Level.SEVERE, "Couldn't set correct modifiers on reflected constructor: " + c, e);
}
}
public static void setFieldModifiers(Field field, int mods) {
try {
jlrFieldModifiers.setInt(field, mods);
}
catch (Exception e) {
log.log(Level.SEVERE, "Couldn't set correct modifiers on reflected field: " + field, e);
}
}
@SuppressWarnings("unchecked")
private static final Constructor jlFieldCtor = (Constructor) Field.class.getDeclaredConstructors()[0];
public static Field newField(Class declaring, Class type, int mods, String name, String sig) {
jlFieldCtor.setAccessible(true);
// This is what the constructor looks like:
// Field(Class declaringClass,String name,Class type,int modifiers, int slot, String signature,
// byte[] annotations)
try {
return jlFieldCtor.newInstance(declaring, name, type, mods, 0, sig, null);
}
catch (Exception e) {
throw new IllegalStateException("Problem creating reloadable Field: " + declaring.getName() + "." + name, e);
}
}
@SuppressWarnings("unchecked")
private static final Constructor> jlConstructorCtor = (Constructor>) Constructor.class
.getDeclaredConstructors()[0];
public static Constructor newConstructor(Class clazz, Class[] params, Class[] exceptions,
int modifiers,
String signature) {
jlConstructorCtor.setAccessible(true);
// This is what the constructor looks like:
// Constructor(Class declaringClass,
// Class[] parameterTypes,
// Class[] checkedExceptions,
// int modifiers,
// int slot,
// String signature,
// byte[] annotations,
// byte[] parameterAnnotations)
try {
return jlConstructorCtor.newInstance(clazz, params, exceptions, modifiers, 0, signature, null, null);
}
catch (Exception e) {
StringBuffer msg = new StringBuffer("Problem creating reloadable Constructor: ");
msg.append(clazz.getName());
msg.append("(");
for (int i = 0; i < params.length; i++) {
if (i > 0) {
msg.append(", ");
}
msg.append(params[i].getName());
}
msg.append(")");
throw new IllegalStateException(msg.toString(), e);
}
}
}
