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/*
* 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;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.MethodNode;
/**
* Captures the information about the reloaded parts of a type that vary each time a new version is loaded.
*
* @author Andy Clement
* @since 0.5.0
*/
public class CurrentLiveVersion {
private static Logger log = Logger.getLogger(CurrentLiveVersion.class.getName());
// Which reloadable type this represents the live version of
final ReloadableType reloadableType;
// Type descriptor for this live version
final TypeDescriptor typeDescriptor;
// 'stamp' (i.e. suffix) for this version
final String versionstamp;
public final IncrementalTypeDescriptor incrementalTypeDescriptor;
String dispatcherName;
byte[] dispatcher;
Class dispatcherClass;
Object dispatcherInstance;
String executorName;
byte[] executor;
Class executorClass;
TypeDelta typeDelta;
private Method staticInitializer;
private boolean haveLookedForStaticInitializer;
public boolean staticInitializedNeedsRerunningOnDefine = false;
public CurrentLiveVersion(ReloadableType reloadableType, String versionstamp, byte[] newbytedata) {
if (GlobalConfiguration.logging && log.isLoggable(Level.FINER)) {
log.entering("CurrentLiveVersion", "", " new version of " + reloadableType.getName()
+ " loaded, version stamp '"
+ versionstamp + "'");
}
this.reloadableType = reloadableType;
this.typeDescriptor = reloadableType.getTypeRegistry().getExtractor().extract(newbytedata, true);
this.versionstamp = versionstamp;
if (GlobalConfiguration.assertsMode) {
if (!this.typeDescriptor.getName().equals(reloadableType.typedescriptor.getName())) {
throw new IllegalStateException("New version has wrong name. Expected "
+ reloadableType.typedescriptor.getName()
+ " but was " + typeDescriptor.getName());
}
}
newbytedata = GlobalConfiguration.callsideRewritingOn ? MethodInvokerRewriter.rewrite(
reloadableType.typeRegistry,
newbytedata) : newbytedata;
this.incrementalTypeDescriptor = new IncrementalTypeDescriptor(reloadableType.typedescriptor);
this.incrementalTypeDescriptor.setLatestTypeDescriptor(this.typeDescriptor);
// Executors for interfaces simply hold annotations
this.executor = reloadableType.getTypeRegistry().executorBuilder.createFor(reloadableType, versionstamp,
typeDescriptor,
newbytedata);
if (GlobalConfiguration.classesToDump != null
&& GlobalConfiguration.classesToDump.contains(reloadableType.getSlashedName())) {
Utils.dump(Utils.getExecutorName(reloadableType.getName(), versionstamp).replace('.', '/'), this.executor);
}
// DEFAULT METHODS - REMOVE THE IF
if (!typeDescriptor.isInterface()) {
this.dispatcherName = Utils.getDispatcherName(reloadableType.getName(), versionstamp);
this.executorName = Utils.getExecutorName(reloadableType.getName(), versionstamp);
this.dispatcher = DispatcherBuilder.createFor(reloadableType, incrementalTypeDescriptor, versionstamp);
}
reloadableType.typeRegistry.checkChildClassLoader(reloadableType);
define();
}
/**
* Defines this version. Called up front but can also be called later if the ChildClassLoader in a type registry is
* discarded and recreated.
*/
public void define() {
staticInitializer = null;
haveLookedForStaticInitializer = false;
// DEFAULT METHODS - remove the if
if (!typeDescriptor.isInterface()) {
try {
dispatcherClass = reloadableType.typeRegistry.defineClass(dispatcherName, dispatcher, false);
}
catch (RuntimeException t) {
// TODO check for something strange. something to do with the file detection misbehaving, see the same file attempted to be reloaded twice...
if (t.getMessage().indexOf("duplicate class definition") == -1) {
throw t;
}
else {
t.printStackTrace();
}
}
}
try {
executorClass = reloadableType.typeRegistry.defineClass(executorName, executor, false);
}
catch (RuntimeException t) {
// TODO check for something strange. something to do with the file detection misbehaving, see the same file attempted to be reloaded twice...
if (t.getMessage().indexOf("duplicate class definition") == -1) {
throw t;
}
else {
t.printStackTrace();
}
}
// DEFAULT METHODS - remove the if
if (!typeDescriptor.isInterface()) {
try {
dispatcherInstance = dispatcherClass.newInstance();
}
catch (InstantiationException e) {
throw new RuntimeException("Unable to build dispatcher class instance", e);
}
catch (IllegalAccessException e) {
throw new RuntimeException("Unable to build dispatcher class instance", e);
}
}
}
public MethodMember getReloadableMethod(String name, String descriptor) {
// Look through the methods on the latest loaded version and find the method we want
MethodMember[] methods = incrementalTypeDescriptor.getLatestTypeDescriptor().getMethods();
for (MethodMember rmethod : methods) {
if (rmethod.getName().equals(name)) {
if (descriptor.equals(rmethod.getDescriptor())) {
return rmethod;
}
}
}
return null;
}
// TODO should be caching the result in the MethodMember objects for speed
public Method getExecutorMethod(MethodMember methodMember) {
String executorDescriptor;
String name;
//What to search for:
if (methodMember.isConstructor()) {
name = Constants.mInitializerName;
}
else {
name = methodMember.getName();
}
executorDescriptor = getExecutorDescriptor(methodMember);
//Search for it:
if (executorClass != null) {
Method[] executorMethods = executorClass.getDeclaredMethods();
for (Method executor : executorMethods) {
if (executor.getName().equals(name) && Type.getMethodDescriptor(executor).equals(executorDescriptor)) {
return executor;
}
}
}
return null;
}
private String getExecutorDescriptor(MethodMember methodMember) {
Type[] params = Type.getArgumentTypes(methodMember.getDescriptor());
Type[] newParametersArray = params;
if (!methodMember.isStatic()) {
newParametersArray = new Type[params.length + 1];
System.arraycopy(params, 0, newParametersArray, 1, params.length);
newParametersArray[0] = Type.getType(reloadableType.getClazz());
}
String executorDescriptor = Type.getMethodDescriptor(Type.getReturnType(methodMember.getDescriptor()),
newParametersArray);
return executorDescriptor;
}
@Override
public String toString() {
return "CurrentLiveVersion [reloadableType=" + reloadableType + ", typeDescriptor=" + typeDescriptor
+ ", versionstamp="
+ versionstamp + ", dispatcherName=" + dispatcherName + ", executorName=" + executorName + "]";
}
public Class getExecutorClass() {
return executorClass;
}
public String getVersionStamp() {
return versionstamp;
}
public Field getExecutorField(String name) throws SecurityException, NoSuchFieldException {
return executorClass.getDeclaredField(name);
}
public TypeDelta getTypeDelta() {
return typeDelta;
}
public void setTypeDelta(TypeDelta td) {
typeDelta = td;
}
public boolean hasClinit() {
return typeDescriptor.hasClinit();
}
public boolean hasConstructorChanged(String descriptor) {
MethodMember mm = typeDescriptor.getConstructor(descriptor);
return hasConstructorChanged(mm);
}
public boolean hasConstructorChanged(MethodMember mm) {
if (mm == null) {
return true;
}
// need to look at the delta
if (typeDelta.haveMethodsChangedOrBeenAddedOrRemoved()) {
if (typeDelta.haveMethodsChanged()) {
MethodDelta md = typeDelta.changedMethods.get(mm.name + mm.descriptor);
if (md != null) {
return true;
}
}
if (typeDelta.haveMethodsBeenAdded()) {
MethodNode mn = typeDelta.brandNewMethods.get(mm.name + mm.descriptor);
if (mn != null) {
return true;
}
}
if (typeDelta.haveMethodsBeenDeleted()) {
MethodNode mn = typeDelta.lostMethods.get(mm.name + mm.descriptor);
if (mn != null) {
return true;
}
}
}
return false;
}
// TODO can we speed this up?
public boolean hasConstructorChanged(int ctorId) {
// need to find the constructor that id is for
MethodMember mm = typeDescriptor.getConstructor(ctorId);
return hasConstructorChanged(mm);
}
public void clearClassloaderLinks() {
this.executorClass = null;
this.dispatcherClass = null;
}
public void reloadMostRecentDispatcherAndExecutor() {
define();
}
public Object getDispatcherInstance() {
// TODO Auto-generated method stub
return null;
}
public void runStaticInitializer() {
if (!haveLookedForStaticInitializer) {
try {
staticInitializer = this.getExecutorClass().getDeclaredMethod(Constants.mStaticInitializerName);
}
catch (NoSuchMethodException e) {
// some types don't have a static initializer, that is OK
}
haveLookedForStaticInitializer = true;
}
if (staticInitializer != null) {
try {
staticInitializer.invoke(null);
}
catch (Exception e) {
log.severe("Unexpected exception whilst trying to call the static initializer on "
+ this.reloadableType.getName());
e.printStackTrace(); // TODO remove when happy
}
}
}
}
