spring-loaded SpringPlugin 源码
spring-loaded SpringPlugin 代码
文件路径：/springloaded/src/main/java/org/springsource/loaded/agent/SpringPlugin.java
/*
* 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
*
* https://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.agent;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.security.ProtectionDomain;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.objectweb.asm.ClassReader;
import org.springsource.loaded.GlobalConfiguration;
import org.springsource.loaded.LoadtimeInstrumentationPlugin;
import org.springsource.loaded.ReloadEventProcessorPlugin;
/**
* First stab at the Spring plugin for Spring-Loaded. Notes...<br>
* <ul>
* <li>On reload, removes the Class entry in
* org/springframework/web/servlet/mvc/annotation/AnnotationMethodHandlerAdapter.methodResolverCache. This enables us to
* add/changes request mappings in controllers.
* <li>That was for Roo, if we create a simple spring template project and run it, this doesn't work. It seems we need
* to redrive detectHandlers() on the DefaultAnnotationHandlerMapping type which will rediscover the URL mappings and
* add them into the handler list. We don't clear old ones out (yet) but the old mappings appear not to work anyway.
* </ul>
*
* @author Andy Clement
* @since 0.5.0
*/
public class SpringPlugin implements LoadtimeInstrumentationPlugin, ReloadEventProcessorPlugin {
private static final String THIS_CLASS = "org/springsource/loaded/agent/SpringPlugin";
private static Logger log = Logger.getLogger(SpringPlugin.class.getName());
private static boolean debug = true;
// TODO [gc] what about GC here - how do we know when they are finished with?
public static List<Object> annotationMethodHandlerAdapterInstances = new ArrayList<Object>();
public static List<Object> defaultAnnotationHandlerMappingInstances = new ArrayList<Object>();
public static List<Object> requestMappingHandlerMappingInstances = new ArrayList<Object>();
public static List<Object> localVariableTableParameterNameDiscovererInstances = null;
public static boolean support305 = true;
private Field classCacheField; // From CachedIntrospectionResults (Spring <= 4.0.x)
private Field strongClassCacheField; // From CachedIntrospectionResults (Spring >= 4.1.0)
private Field softClassCacheField; // From CachedIntrospectionResults (Spring >= 4.1.0)
private Field declaredMethodsCacheField; // From ReflectionUtils
private Field parameterNamesCacheField; // From LocalVariableTableParameterNameDiscoverer
private boolean cachedIntrospectionResultsClassLoaded = false;
private boolean reflectionUtilsClassLoaded = false;
private Class<?> cachedIntrospectionResultsClass = null;
private Class<?> reflectionUtilsClass = null;
public boolean accept(String slashedTypeName, ClassLoader classLoader, ProtectionDomain protectionDomain,
byte[] bytes) {
// TODO take classloader into account?
if (slashedTypeName == null) {
return false;
}
if (slashedTypeName.equals("org/springframework/core/LocalVariableTableParameterNameDiscoverer")) {
return true;
}
// Just interested in whether this type got loaded
if (slashedTypeName.equals("org/springframework/beans/CachedIntrospectionResults")) {
cachedIntrospectionResultsClassLoaded = true;
}
// Just interested in whether this type got loaded
if (slashedTypeName.equals("org/springframework/util/ReflectionUtils")) {
reflectionUtilsClassLoaded = true;
}
return slashedTypeName.equals("org/springframework/web/servlet/mvc/annotation/AnnotationMethodHandlerAdapter")
||
slashedTypeName.equals(
"org/springframework/web/servlet/mvc/method/annotation/RequestMappingHandlerMapping")
|| // 3.1
(support305 && slashedTypeName.equals(
"org/springframework/web/servlet/mvc/annotation/DefaultAnnotationHandlerMapping"));
}
public byte[] modify(String slashedClassName, ClassLoader classLoader, byte[] bytes) {
if ((GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.INFO)) || debug) {
log.info("SPRING_PLUGIN: loadtime modifying " + slashedClassName);
}
if (slashedClassName.equals("org/springframework/web/servlet/mvc/annotation/AnnotationMethodHandlerAdapter")) {
return bytesWithInstanceCreationCaptured(bytes, THIS_CLASS,
"recordAnnotationMethodHandlerAdapterInstance");
}
else if (slashedClassName.equals(
"org/springframework/web/servlet/mvc/method/annotation/RequestMappingHandlerMapping")) {
// springmvc spring 3.1 - doesnt work on 3.1 post M2 snapshots
return bytesWithInstanceCreationCaptured(bytes, THIS_CLASS,
"recordRequestMappingHandlerMappingInstance");
}
else if (slashedClassName.equals("org/springframework/core/LocalVariableTableParameterNameDiscoverer")) {
return bytesWithInstanceCreationCaptured(bytes, THIS_CLASS,
"recordLocalVariableTableParameterNameDiscoverer");
}
else { // "org/springframework/web/servlet/mvc/annotation/DefaultAnnotationHandlerMapping"
// springmvc spring 3.0
return bytesWithInstanceCreationCaptured(bytes, THIS_CLASS,
"recordDefaultAnnotationHandlerMappingInstance");
}
}
// called by the modified code
public static void recordAnnotationMethodHandlerAdapterInstance(Object obj) {
annotationMethodHandlerAdapterInstances.add(obj);
}
public static void recordRequestMappingHandlerMappingInstance(Object obj) {
if (debug) {
System.out.println("SPRING_PLUGIN: Recording request mapping handler mapping instance..." + obj);
}
requestMappingHandlerMappingInstances.add(obj);
}
public static void recordLocalVariableTableParameterNameDiscoverer(Object obj) {
if (localVariableTableParameterNameDiscovererInstances == null) {
localVariableTableParameterNameDiscovererInstances = new ArrayList<Object>();
}
localVariableTableParameterNameDiscovererInstances.add(obj);
}
static {
try {
String debugString = System.getProperty("springloaded.plugins.spring.debug", "false");
debug = Boolean.valueOf(debugString);
}
catch (Exception e) {
// likely security exception
}
}
// called by the modified code
public static void recordDefaultAnnotationHandlerMappingInstance(Object obj) {
if (debug) {
System.out.println("SPRING_PLUGIN: Recording new instance of DefaultAnnotationHandlerMappingInstance");
}
defaultAnnotationHandlerMappingInstances.add(obj);
}
public void reloadEvent(String typename, Class<?> clazz, String versionsuffix) {
removeClazzFromMethodResolverCache(clazz);
removeClazzFromDeclaredMethodsCache(clazz);
clearCachedIntrospectionResults(clazz);
reinvokeDetectHandlers(); // Spring 3.0
reinvokeInitHandlerMethods(); // Spring 3.1
clearLocalVariableTableParameterNameDiscovererCache(clazz);
}
/**
* The Spring class LocalVariableTableParameterNameDiscoverer holds a cache of parameter names discovered for
* members within classes and needs clearing if the class changes.
*
* @param clazz the class being reloaded, which may exist in a parameter name discoverer cache
*/
private void clearLocalVariableTableParameterNameDiscovererCache(Class<?> clazz) {
if (localVariableTableParameterNameDiscovererInstances == null) {
return;
}
if (debug) {
System.out.println("SPRING_PLUGIN: ParameterNamesCache: Clearing parameter name discoverer caches");
}
if (parameterNamesCacheField == null) {
try {
parameterNamesCacheField = localVariableTableParameterNameDiscovererInstances.get(
0).getClass().getDeclaredField("parameterNamesCache");
}
catch (NoSuchFieldException nsfe) {
log.log(Level.SEVERE,
"Unexpectedly cannot find parameterNamesCache field on LocalVariableTableParameterNameDiscoverer class");
}
}
for (Object instance : localVariableTableParameterNameDiscovererInstances) {
try {
parameterNamesCacheField.setAccessible(true);
Map<?, ?> parameterNamesCache = (Map<?, ?>) parameterNamesCacheField.get(instance);
Object o = parameterNamesCache.remove(clazz);
if (debug) {
System.out.println(
"SPRING_PLUGIN: ParameterNamesCache: Removed " + clazz.getName() + " from cache?"
+ (o != null));
}
}
catch (IllegalAccessException e) {
log.log(Level.SEVERE,
"Unexpected IllegalAccessException trying to access parameterNamesCache field on LocalVariableTableParameterNameDiscoverer class");
}
catch (IllegalArgumentException iae) {
log.log(Level.SEVERE,
"Unexpected IllegalArgumentException trying to access parameterNamesCache field on LocalVariableTableParameterNameDiscoverer class");
}
}
}
private void removeClazzFromMethodResolverCache(Class<?> clazz) {
for (Object o : annotationMethodHandlerAdapterInstances) {
try {
Field f = o.getClass().getDeclaredField("methodResolverCache");
f.setAccessible(true);
Map<?, ?> map = (Map<?, ?>) f.get(o);
Method removeMethod = Map.class.getDeclaredMethod("remove", Object.class);
Object ret = removeMethod.invoke(map, clazz);
if (GlobalConfiguration.debugplugins) {
System.err.println("SPRING_PLUGIN: clearing methodResolverCache for " + clazz.getName());
}
if (GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.INFO)) {
log.info("cleared a cache entry? " + (ret != null));
}
}
catch (Exception e) {
log.log(Level.SEVERE, "Unexpected problem accessing methodResolverCache on " + o, e);
}
}
}
private void removeClazzFromDeclaredMethodsCache(Class<?> clazz) {
if (reflectionUtilsClassLoaded) {
try {
// TODO not a fan of classloading like this
if (reflectionUtilsClass == null) {
// TODO what about two apps using reloading and diff versions of spring?
reflectionUtilsClass = clazz.getClassLoader().loadClass(
"org.springframework.util.ReflectionUtils");
}
if (declaredMethodsCacheField == null) {
try {
declaredMethodsCacheField = reflectionUtilsClass.getDeclaredField("declaredMethodsCache");
}
catch (NoSuchFieldException e) {
}
}
if (declaredMethodsCacheField != null) {
declaredMethodsCacheField.setAccessible(true);
Map m = (Map) declaredMethodsCacheField.get(null);
Object o = m.remove(clazz);
if (GlobalConfiguration.debugplugins) {
System.err.println("SpringPlugin: clearing ReflectionUtils.declaredMethodsCache for "
+ clazz.getName() + " removed=" + o);
}
}
}
catch (Exception e) {
if (GlobalConfiguration.debugplugins) {
e.printStackTrace();
}
}
}
}
private void clearCachedIntrospectionResults(Class<?> clazz) {
if (cachedIntrospectionResultsClassLoaded) {
try {
// TODO not a fan of classloading like this
if (cachedIntrospectionResultsClass == null) {
// TODO what about two apps using reloading and diff versions of spring?
cachedIntrospectionResultsClass = clazz.getClassLoader().loadClass(
"org.springframework.beans.CachedIntrospectionResults");
}
if (classCacheField == null && strongClassCacheField == null) {
try {
classCacheField = cachedIntrospectionResultsClass.getDeclaredField("classCache");
}
catch (NoSuchFieldException e) {
strongClassCacheField = cachedIntrospectionResultsClass.getDeclaredField("strongClassCache");
softClassCacheField = cachedIntrospectionResultsClass.getDeclaredField("softClassCache");
}
}
if (classCacheField != null) {
classCacheField.setAccessible(true);
Map m = (Map) classCacheField.get(null);
Object o = m.remove(clazz);
if (GlobalConfiguration.debugplugins) {
System.err.println("SpringPlugin: clearing CachedIntrospectionResults.classCache for "
+ clazz.getName() + " removed=" + o);
}
}
if (strongClassCacheField != null) {
strongClassCacheField.setAccessible(true);
Map m = (Map) strongClassCacheField.get(null);
Object o = m.remove(clazz);
if (GlobalConfiguration.debugplugins) {
System.err.println("SpringPlugin: clearing CachedIntrospectionResults.strongClassCache for "
+ clazz.getName() + " removed=" + o);
}
}
if (softClassCacheField != null) {
softClassCacheField.setAccessible(true);
Map m = (Map) softClassCacheField.get(null);
Object o = m.remove(clazz);
if (GlobalConfiguration.debugplugins) {
System.err.println("SpringPlugin: clearing CachedIntrospectionResults.softClassCache for "
+ clazz.getName() + " removed=" + o);
}
}
}
catch (Exception e) {
if (GlobalConfiguration.debugplugins) {
e.printStackTrace();
}
}
}
}
private void reinvokeDetectHandlers() {
// want to call detectHandlers on the DefaultAnnotationHandlerMapping type
// protected void detectHandlers() throws BeansException { is defined on AbstractDetectingUrlHandlerMapping
for (Object o : defaultAnnotationHandlerMappingInstances) {
if (debug) {
System.out.println(
"SPRING_PLUGIN: Invoking detectHandlers on instance of DefaultAnnotationHandlerMappingInstance");
}
try {
Class<?> clazz_AbstractDetectingUrlHandlerMapping = o.getClass().getSuperclass();
Method method_detectHandlers = clazz_AbstractDetectingUrlHandlerMapping.getDeclaredMethod(
"detectHandlers");
method_detectHandlers.setAccessible(true);
method_detectHandlers.invoke(o);
}
catch (Exception e) {
// if debugging then print it
if (GlobalConfiguration.debugplugins) {
e.printStackTrace();
}
}
}
}
private void reinvokeInitHandlerMethods() {
// org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping (super AbstractHandlerMethodMapping) - call protected void initHandlerMethods() on it.
for (Object o : requestMappingHandlerMappingInstances) {
if (debug) {
System.out.println(
"SPRING_PLUGIN: Invoking initHandlerMethods on instance of RequestMappingHandlerMapping");
}
Class<?> clazz_AbstractHandlerMethodMapping = null;
try {
clazz_AbstractHandlerMethodMapping = o.getClass().getSuperclass().getSuperclass();
}
catch (Exception e) {
if (debug) {
System.out.println("SPRING_PLUGIN: Unable to get to AbstractHandlerMethodMapping from RMHM");
}
if (GlobalConfiguration.debugplugins) {
e.printStackTrace();
}
}
if (clazz_AbstractHandlerMethodMapping != null) {
try {
// private final Map<T, HandlerMethod> handlerMethods = new LinkedHashMap<T, HandlerMethod>();
Field field_handlerMethods = clazz_AbstractHandlerMethodMapping.getDeclaredField("handlerMethods");
field_handlerMethods.setAccessible(true);
Map m = (Map) field_handlerMethods.get(o);
m.clear();
}
catch (NoSuchFieldException e) {
if (debug) {
System.out.println("SPRING_PLUGIN: Unable to find handlerMethods field to clear");
}
}
catch (Exception e) {
if (GlobalConfiguration.debugplugins) {
e.printStackTrace();
}
}
try {
Field field_urlMap = clazz_AbstractHandlerMethodMapping.getDeclaredField("urlMap");
field_urlMap.setAccessible(true);
Map m = (Map) field_urlMap.get(o);
m.clear();
}
catch (NoSuchFieldException e) {
if (debug) {
System.out.println("SPRING_PLUGIN: Unable to find urlMap field to clear");
}
}
catch (Exception e) {
if (GlobalConfiguration.debugplugins) {
e.printStackTrace();
}
}
clearMappingRegistry(o, clazz_AbstractHandlerMethodMapping);
try {
Method method_initHandlerMethods = clazz_AbstractHandlerMethodMapping.getDeclaredMethod(
"initHandlerMethods");
method_initHandlerMethods.setAccessible(true);
method_initHandlerMethods.invoke(o);
}
catch (Exception e) {
if (GlobalConfiguration.debugplugins || debug) {
e.printStackTrace();
}
}
}
}
}
// More recent Springs use a MappingRegistry - clear it out if we can get at it, otherwise on re-driving
// the initHandlerMethods below we will get an error about already existing mappings
private void clearMappingRegistry(Object o, Class<?> clazz_AbstractHandlerMethodMapping) {
if (debug) {
System.out.println("SPRING_PLUGIN: clearing out mapping registry...");
}
Object mappingRegistryInstance = null;
try {
Field field_mappingRegistry = clazz_AbstractHandlerMethodMapping.getDeclaredField("mappingRegistry");
field_mappingRegistry.setAccessible(true);
mappingRegistryInstance = field_mappingRegistry.get(o);
}
catch (NoSuchFieldException e) {
if (debug) {
System.out.println(
"SPRING_PLUGIN: Unable to get mappingRegistry field on AbstractHandlerMethodMapping");
}
}
catch (IllegalAccessException e) {
if (GlobalConfiguration.debugplugins || debug) {
System.out.println(
"SPRING_PLUGIN: Problem accessing mappingRegistry field on AbstractHandlerMethodMapping: ");
e.printStackTrace(System.out);
}
}
if (mappingRegistryInstance == null) {
return;
}
Class mappingRegistryClass = mappingRegistryInstance.getClass();
clearMapField(mappingRegistryClass, mappingRegistryInstance, "registry");
clearMapField(mappingRegistryClass, mappingRegistryInstance, "mappingLookup");
clearMapField(mappingRegistryClass, mappingRegistryInstance, "urlLookup");
clearMapField(mappingRegistryClass, mappingRegistryInstance, "nameLookup");
clearMapField(mappingRegistryClass, mappingRegistryInstance, "corsLookup");
if (debug) {
System.out.println("SPRING_PLUGIN: ... cleared out the mapping registry contents");
}
}
private void clearMapField(Class clazz, Object instance, String name) {
try {
Field field = clazz.getDeclaredField(name);
field.setAccessible(true);
Map m = (Map) field.get(instance);
m.clear();
}
catch (NoSuchFieldException e) {
if (debug) {
System.out.println("SPRING_PLUGIN: Unable to find field '" + name + "' to clear");
}
}
catch (Exception e) {
if (GlobalConfiguration.debugplugins || debug) {
e.printStackTrace();
}
}
}
public boolean shouldRerunStaticInitializer(String typename, Class<?> clazz, String encodedTimestamp) {
return false;
}
/**
* Modify the supplied bytes such that constructors are intercepted and will invoke the specified class/method so
* that the instances can be tracked.
*
* @return modified bytes for the class
*/
private byte[] bytesWithInstanceCreationCaptured(byte[] bytes, String classToCall, String methodToCall) {
ClassReader cr = new ClassReader(bytes);
ClassVisitingConstructorAppender ca = new ClassVisitingConstructorAppender(classToCall, methodToCall);
cr.accept(ca, 0);
byte[] newbytes = ca.getBytes();
return newbytes;
}
}
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