spring-loaded SpringLoadedPreProcessor 源码
spring-loaded SpringLoadedPreProcessor 代码
文件路径：/springloaded/src/main/java/org/springsource/loaded/agent/SpringLoadedPreProcessor.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.io.File;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URI;
import java.security.CodeSource;
import java.security.ProtectionDomain;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.springsource.loaded.Constants;
import org.springsource.loaded.GlobalConfiguration;
import org.springsource.loaded.IsReloadableTypePlugin;
import org.springsource.loaded.LoadtimeInstrumentationPlugin;
import org.springsource.loaded.Log;
import org.springsource.loaded.Plugin;
import org.springsource.loaded.ReloadableType;
import org.springsource.loaded.SystemClassReflectionInvestigator;
import org.springsource.loaded.SystemClassReflectionRewriter;
import org.springsource.loaded.SystemClassReflectionRewriter.RewriteResult;
import org.springsource.loaded.TypeRegistry;
import org.springsource.loaded.TypeRegistry.ReloadableTypeNameDecision;
import org.springsource.loaded.Utils;
import org.springsource.loaded.ri.ReflectiveInterceptor;
import org.springsource.loaded.support.Java8;
/**
* The entry point for the agent - all classes that can be modified will be passed into preProcess(). They have to be
* dealt with in one of these ways:
* <ul>
* <li>reloadable types need their bytecode rewriting so that they can be modified later
* <li>'framework' types (not loaded by the system classloader) need their reflection calls rewritten
* <li>system classes also need their reflection calls modified but in a different way (they cannot have dependencies on
* types they cannot see)
* </ul>
*
* @author Andy Clement
* @since 0.5.0
*/
public class SpringLoadedPreProcessor implements Constants {
private static Logger log = Logger.getLogger(SpringLoadedPreProcessor.class.getName());
private static List<Plugin> plugins = null;
// Global control to turn off the agent, used when testing
public static boolean disabled = false;
// These are system classes that contain reflection code and so need instrumenting when encountered.
private static List<String> systemClassesContainingReflection;
// Once the system classes have been encountered and instrumented, they need initialization once they have been defined
// to the VM. This records the list of those that have not yet been initialized.
private Map<String, Integer> systemClassesRequiringInitialization = new HashMap<String, Integer>();
// Once the first reloadabletype is hit, we can start initializing the system classes with reflective interceptors.
// Doing it early can lead to hangs
private static boolean firstReloadableTypeHit = false;
public void initialize() {
// When spring loaded is running as an agent, it should not be defining types directly (this setting does not apply to
// the generated suuport types)
GlobalConfiguration.directlyDefineTypes = false;
GlobalConfiguration.fileSystemMonitoring = true;
systemClassesContainingReflection = new ArrayList<String>();
// So that jaxb annotations will cause discovery of the correct properties:
systemClassesContainingReflection.add("com/sun/xml/internal/bind/v2/model/nav/ReflectionNavigator");
// So that proxies are generated with the right set of methods inside
systemClassesContainingReflection.add("sun/misc/ProxyGenerator");
// (at least) the call to getModifiers() needs interception
systemClassesContainingReflection.add("java/lang/reflect/Proxy");
// So that javabeans introspection is intercepter
systemClassesContainingReflection.add("java/beans/Introspector");
// Related to serialization
// TODO [serialization] Caches in ObjectStreamClass for descriptors, need clearing on reload
systemClassesContainingReflection.add("java/io/ObjectStreamClass");
systemClassesContainingReflection.add("java/io/ObjectStreamClass$EntryFuture");
// Don't need this right now, instead we are not removing 'final' from the serialVersionUID
// // Need to catch at least the call to access the serialVersionUID made in getDeclaredSUID()
// systemClassesContainingReflection.add("java/io/ObjectStreamClass$2");
}
/**
* Main entry point to Spring Loaded when it is running as an agent. This method will use the classLoader and the
* class name in order to determine whether the type should be made reloadable. Non-reloadable types will at least
* get their call sites rewritten.
*
* @param classLoader the classloader loading this type
* @param slashedClassName the slashed class name (e.g. java/lang/String) being loaded
* @param protectionDomain the protection domain for the loaded class
* @param bytes the class bytes for the class being loaded
* @return potentially modified bytes
*/
public byte[] preProcess(ClassLoader classLoader, String slashedClassName, ProtectionDomain protectionDomain,
byte[] bytes) {
if (disabled) {
return bytes;
}
// TODO need configurable debug here, ability to dump any code before/after
for (Plugin plugin : getGlobalPlugins()) {
if (plugin instanceof LoadtimeInstrumentationPlugin) {
LoadtimeInstrumentationPlugin loadtimeInstrumentationPlugin = (LoadtimeInstrumentationPlugin) plugin;
if (loadtimeInstrumentationPlugin.accept(slashedClassName, classLoader, protectionDomain, bytes)) {
bytes = loadtimeInstrumentationPlugin.modify(slashedClassName, classLoader, bytes);
}
}
}
tryToEnsureSystemClassesInitialized(slashedClassName);
TypeRegistry typeRegistry = TypeRegistry.getTypeRegistryFor(classLoader);
if (GlobalConfiguration.verboseMode && log.isLoggable(Level.INFO)) {
logPreProcess(classLoader, slashedClassName, typeRegistry);
}
if (typeRegistry == null) { // A null type registry indicates nothing is being made reloadable for the classloader
if (classLoader == null && slashedClassName != null) { // Indicates loading of a system class
if (systemClassesContainingReflection.contains(slashedClassName)) {
try {
// TODO [perf] why are we not using the cache here, is it because the list is so short?
RewriteResult rr = SystemClassReflectionRewriter.rewrite(slashedClassName, bytes);
if (GlobalConfiguration.verboseMode && log.isLoggable(Level.INFO)) {
log.info("System class rewritten: name=" + slashedClassName + " rewrite summary="
+ rr.summarize());
}
systemClassesRequiringInitialization.put(slashedClassName, rr.bits);
return rr.bytes;
}
catch (Exception re) {
re.printStackTrace();
}
}
else if (slashedClassName.equals("java/lang/invoke/InnerClassLambdaMetafactory")) {
bytes = Java8.enhanceInnerClassLambdaMetaFactory(bytes);
return bytes;
}
else if ((GlobalConfiguration.investigateSystemClassReflection
|| GlobalConfiguration.rewriteAllSystemClasses)
&&
SystemClassReflectionInvestigator.investigate(slashedClassName, bytes,
GlobalConfiguration.investigateSystemClassReflection) > 0) {
// This block can help when you suspect there is a system class using reflection and that
// class isn't on the 'shortlist' (in systemClassesContainingReflection). Basically turn on the
// options to trigger this investigation then add them to the shortlist if it looks like they need rewriting.
RewriteResult rr = SystemClassReflectionRewriter.rewrite(slashedClassName, bytes);
if (GlobalConfiguration.rewriteAllSystemClasses) {
systemClassesRequiringInitialization.put(slashedClassName, rr.bits);
return rr.bytes;
}
else {
System.err.println("Type " + slashedClassName + " rewrite summary: " + rr.summarize());
return bytes;
}
}
}
return bytes;
}
// What happens here? The aim is to determine if the type should be made reloadable.
// 1. If NO, but something in this classloader might be, then rewrite the call sites.
// 2. If NO, and nothing in this classloader might be, return the original bytes.
// 3. If YES, make the type reloadable (including rewriting call sites)
ReloadableTypeNameDecision isReloadableTypeName = typeRegistry.isReloadableTypeName(slashedClassName,
protectionDomain, bytes);
if (isReloadableTypeName.isReloadable && GlobalConfiguration.explainMode && log.isLoggable(Level.INFO)) {
log.info("[explanation] Based on the name, type " + slashedClassName + " is considered to be reloadable");
}
// logging causes a ClassCircularity problem when reporting on:
// SL: Type 'org/codehaus/groovy/grails/cli/logging/GrailsConsolePrintStream' is not being made reloadable
// if (GlobalConfiguration.verboseMode && isReloadableTypeName) {
// Log.log("Type '"+slashedClassName+"' is preliminarily being considered a reloadable type");
// }
if (isReloadableTypeName.isReloadable) {
if (!firstReloadableTypeHit) {
firstReloadableTypeHit = true;
// TODO move into the ctor for ReloadableType so that it can't block loading
tryToEnsureSystemClassesInitialized(slashedClassName);
}
if (GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.INFO)) {
log.info("processing " + slashedClassName + " as a reloadable type");
}
try {
// TODO decide one way or the other on slashed/dotted from preprocessor to infrastructure
String dottedClassName = slashedClassName.replace('/', '.');
String watchPath = getWatchPathFromProtectionDomain(protectionDomain, slashedClassName);
if (watchPath == null) {
// For a CGLIB generated type, we may still need to make the type reloadable. For example:
// type: com/vmware/rabbit/ApplicationContext$$EnhancerByCGLIB$$512eb60c
// codesource determined to be: file:/Users/aclement/springsource/tc-server-developer-2.1.1.RELEASE/spring-insight-instance/wtpwebapps/hello-rabbit-client/WEB-INF/lib/cglib-nodep-2.2.jar <no signer certificates>
// But if the type 'com/vmware/rabbit/ApplicationContext' is reloadable, then this should be too
boolean makeReloadableAnyway = false;
int cglibIndex = slashedClassName.indexOf("$$EnhancerBy");
if (cglibIndex != -1) {
String originalType = slashedClassName.substring(0, cglibIndex);
if (GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.INFO)) {
log.info("Appears to be a CGLIB type, checking if type " + originalType + " is reloadable");
}
TypeRegistry currentRegistry = typeRegistry;
while (currentRegistry != null) {
ReloadableType originalReloadable = currentRegistry.getReloadableType(originalType);
if (originalReloadable != null) {
makeReloadableAnyway = true;
break;
}
currentRegistry = currentRegistry.getParentRegistry();
}
// if (typeRegistry.isReloadableTypeName(originalType)) {
// if (GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.INFO)) {
// log.info("Type " + originalType + " is reloadable, so making CGLIB type " + slashedClassName
// + " reloadable");
// }
// makeReloadableAnyway = true;
// }
}
int cglibIndex2 = makeReloadableAnyway ? -1 : slashedClassName.indexOf("$$FastClassByCGLIB");
if (cglibIndex2 != -1) {
String originalType = slashedClassName.substring(0, cglibIndex2);
if (GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.INFO)) {
log.info("Appears to be a CGLIB FastClass type, checking if type " + originalType
+ " is reloadable");
}
TypeRegistry currentRegistry = typeRegistry;
while (currentRegistry != null) {
ReloadableType originalReloadable = currentRegistry.getReloadableType(originalType);
if (originalReloadable != null) {
makeReloadableAnyway = true;
break;
}
currentRegistry = currentRegistry.getParentRegistry();
}
// if (typeRegistry.isReloadableTypeName(originalType)) {
// if (GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.INFO)) {
// log.info("Type " + originalType + " is reloadable, so making CGLIB type " + slashedClassName
// + " reloadable");
// }
// makeReloadableAnyway = true;
// }
}
int proxyIndex = makeReloadableAnyway ? -1 : slashedClassName.indexOf("$Proxy");
if (proxyIndex == 0 || (proxyIndex > 0 && slashedClassName.charAt(proxyIndex - 1) == '/')) {
// Determine if the interfaces being implemented are reloadable
String[] interfacesImplemented = Utils.discoverInterfaces(bytes);
if (interfacesImplemented != null) {
for (int i = 0; i < interfacesImplemented.length; i++) {
TypeRegistry currentRegistry = typeRegistry;
while (currentRegistry != null) {
ReloadableType originalReloadable = currentRegistry.getReloadableType(
interfacesImplemented[i]);
if (originalReloadable != null) {
makeReloadableAnyway = true;
break;
}
currentRegistry = currentRegistry.getParentRegistry();
}
// if (typeRegistry.isReloadableTypeName(interfacesImplemented[i])) {
// makeReloadableAnyway = true;
// }
}
}
}
// GRAILS-8098
// The scaffolding loader will load stuff in this innerloader - if we don't make the types in it reloadable then they will clash
// with the original (ordinary version) controller loaded by URLClassLoader (e.g. in an istcheck for some type we will
// not find it in the InnerClassLoader, but find it in the super classloader, and it'll be the wrong one).
// I wonder if the more general rule should be that
// all classloaders below one loading reloadable stuff should also load reloadable stuff.
if (!makeReloadableAnyway
&& classLoader.getClass().getName().endsWith("GroovyClassLoader$InnerLoader")) {
makeReloadableAnyway = true;
}
if (!makeReloadableAnyway) {
// can't watch it for updates (it comes from a jar perhaps) so just rewrite call sites and return
// Not planning to watch this class so ordinarily do not make it reloadable. UNLESS the user
// is specifying that it needs to be. This may happen with split packages - some classes in a jar
// and some on disk. During type rewriting the top most reloadable types get fields inserted -
// when split across jars we get confused by split packages. If we go by name (as the code does
// right now) then we think we aren't the top most reloadable type but we don't realize that the
// type above us comes from a jar. Hence this condition below. If the user did explicitly
// specify types with this kind of name should be made reloadable we even make the ones from
// the jar reloadable. (TODO: optimization, make a smarter isTopMostReloadableType test that
// allows us to keep the jar loaded types as non reloadable).
// if (isReloadableTypeName.extraInfo && isReloadableTypeName.explicitlyIncluded
// && !GlobalConfiguration.InTestMode) {
//
// }
// else {
if (GlobalConfiguration.verboseMode) {
Log.log("Cannot watch " + slashedClassName + ": not making it reloadable");
}
if (needsClientSideRewriting(slashedClassName)) {
bytes = typeRegistry.methodCallRewriteUseCacheIfAvailable(slashedClassName, bytes);
}
return bytes;
// }
}
}
ReloadableType rtype = typeRegistry.addType(dottedClassName, bytes);
if (rtype == null && GlobalConfiguration.callsideRewritingOn) {
// it is not a candidate for being made reloadable (maybe it is an annotation type)
// but we still need to rewrite call sites.
bytes = typeRegistry.methodCallRewrite(bytes);
}
else {
if (GlobalConfiguration.fileSystemMonitoring && watchPath != null) {
typeRegistry.monitorForUpdates(rtype, watchPath);
}
return rtype.bytesLoaded;
}
}
catch (RuntimeException re) {
log.throwing("SpringLoadedPreProcessor", "preProcess", re);
throw re;
}
}
else {
try {
// TODO what happens across classloader boundaries? (for regular code and reflective calls)
// Skipping the CallSiteClassLoader here because types from there will already have been dealt
// with due to GroovyPlugin class that intercepts define in that infrastructure
if (needsClientSideRewriting(slashedClassName) &&
(classLoader == null || !classLoader.getClass().getName().equals(
"org.codehaus.groovy.runtime.callsite.CallSiteClassLoader"))) {
bytes = typeRegistry.methodCallRewriteUseCacheIfAvailable(slashedClassName, bytes);
}
}
catch (Throwable t) {
log.log(Level.SEVERE, "Unexpected problem transforming call sites", t);
}
}
return bytes;
}
private void tryToEnsureSystemClassesInitialized(String slashedClassName) {
if (firstReloadableTypeHit && !systemClassesRequiringInitialization.isEmpty()) {
int lastSlash = slashedClassName.lastIndexOf('/');
String pkg = lastSlash == -1 ? null : slashedClassName.substring(0, lastSlash);
ensurePreparedForInjection();
List<String> toRemoveList = new ArrayList<String>();
for (Map.Entry<String, Integer> me : systemClassesRequiringInitialization.entrySet()) {
String classname = me.getKey();
// A ClassCircularityError can occur in the injectReflectiveInterceptorMethods() method below. Reason:
// ===
// CCE: "A class or interface could not be loaded because it would be its own superclass or superinterface"
// according to the Java Virtual Machine Specification (JVMS 2.17.2).
// The implementation of the virtual machine generally detects this by noting the
// beginning of an attempt to load a class and then noticing when the
// same task thread attempts to load that same class again before the original
// attempt has completed (is still in progress).
// ===
// So, if we attempt to 'fix up' a class here which has a relationship with the type we are currently
// loading, then it looks like a CCE. The crude initial fix is to avoid working on anything in the
// same package as us. This doesn't quite fix all the cases of course but addresses a chunk of them.
// One remaining case I can clearly see in the log is that java.beans.Introspector (which needs fixing up)
// uses a field of type com.sun.beans.WeakCache.
// A full list of the special relationships could be encoded here (don't touch X until Y,Z,etc loaded)
// but that will just get out of date so quickly. Given that it isn't necessarily a problem because
// the fixing up will be re-attempted again, the simplest thing would be just to avoid printing
// CCEs (but log all other issues).
if (pkg != null && classname.startsWith(pkg)) {
continue;
}
int bits = me.getValue();
try {
ClassLoader cl = SpringLoadedPreProcessor.class.getClassLoader();
if (cl == null) {
cl = ClassLoader.getSystemClassLoader();
}
if (cl == null) {
throw new IllegalStateException(
"Unable to determine a classloader to use to ensure system classes properly initialized for reloading");
}
Class<?> clazz = cl.loadClass(classname.replace('/', '.'));
injectReflectiveInterceptorMethods(slashedClassName, bits, clazz);
toRemoveList.add(classname);
}
catch (ClassCircularityError cce) {
// See comment above. 'assume' this is OK, the initialization will happen again next time around.
}
catch (Exception e) {
// NPE seen out in the wild:
// java.lang.NullPointerException
// at java.lang.reflect.Proxy.isProxyClass(Proxy.java:789)
// at java.lang.Class.checkPackageAccess(Class.java:2358)
// at java.lang.Class.checkMemberAccess(Class.java:2338)
// at java.lang.Class.getDeclaredField(Class.java:2054)
// at org.springsource.loaded.agent.SpringLoadedPreProcessor.injectReflectiveInterceptorMethods(SpringLoadedPreProcessor.java:446)
// at org.springsource.loaded.agent.SpringLoadedPreProcessor.tryToEnsureSystemClassesInitialized(SpringLoadedPreProcessor.java:386)
// at org.springsource.loaded.agent.SpringLoadedPreProcessor.preProcess(SpringLoadedPreProcessor.java:132)
// at org.springsource.loaded.agent.ClassPreProcessorAgentAdapter.transform(ClassPreProcessorAgentAdapter.java:107)
// at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
// at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
// at java.lang.reflect.Proxy.<clinit>(Proxy.java:240)
// at sun.reflect.misc.ReflectUtil.isNonPublicProxyClass(ReflectUtil.java:289)
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
String stringifiedException = sw.toString();
if (stringifiedException.length() > 500)
stringifiedException = stringifiedException.substring(0, 500);
if (GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.INFO)) {
log.info("Exception occurred whilst trying to initalize system classes (probably harmless): "
+ stringifiedException);
}
}
}
for (String toRemove : toRemoveList) {
systemClassesRequiringInitialization.remove(toRemove); // TODO threads?
}
}
}
// TODO should cache these retrieved fields/methods for injection into types
/**
* This method tries to inject the ReflectiveInterceptor methods into any system types that have been rewritten.
*/
private void injectReflectiveInterceptorMethods(String slashedClassName, int bits, Class<?> clazz)
throws NoSuchFieldException,
IllegalAccessException, NoSuchMethodException {
// TODO log the bits
if ((bits & Constants.JLC_GETDECLAREDFIELDS) != 0) {
Field f = clazz.getDeclaredField("__sljlcgdfs");
f.setAccessible(true);
f.set(null, method_jlcgdfs);
}
if ((bits & Constants.JLC_GETDECLAREDFIELD) != 0) {
Field f = clazz.getDeclaredField(jlcgdf);
f.setAccessible(true);
f.set(null, method_jlcgdf);
}
if ((bits & Constants.JLC_GETFIELD) != 0) {
Field f = clazz.getDeclaredField(jlcgf);
f.setAccessible(true);
f.set(null, method_jlcgf);
}
if ((bits & Constants.JLC_GETDECLAREDMETHODS) != 0) {
Field f = clazz.getDeclaredField(jlcgdms);
f.setAccessible(true);
f.set(null, method_jlcgdms);
}
if ((bits & Constants.JLC_GETDECLAREDMETHOD) != 0) {
Field f = clazz.getDeclaredField(jlcgdm);
f.setAccessible(true);
f.set(null, method_jlcgdm);
}
if ((bits & Constants.JLC_GETMETHOD) != 0) {
Field f = clazz.getDeclaredField(jlcgm);
f.setAccessible(true);
f.set(null, method_jlcgm);
}
if ((bits & Constants.JLC_GETDECLAREDCONSTRUCTOR) != 0) {
Field f = clazz.getDeclaredField(jlcgdc);
f.setAccessible(true);
f.set(null, method_jlcgdc);
}
if ((bits & Constants.JLC_GETMODIFIERS) != 0) {
Field f = clazz.getDeclaredField(jlcgmods);
f.setAccessible(true);
f.set(null, method_jlcgmods);
}
if ((bits & Constants.JLC_GETMETHODS) != 0) {
Field f = clazz.getDeclaredField(jlcgms);
f.setAccessible(true);
f.set(null, method_jlcgms);
}
if ((bits & Constants.JLC_GETCONSTRUCTOR) != 0) {
Field f = clazz.getDeclaredField(jlcgc);
f.setAccessible(true);
f.set(null, method_jlcgc);
}
if ((bits & Constants.JLC_GETDECLAREDCONSTRUCTORS) != 0) {
Field f = clazz.getDeclaredField(jlcGetDeclaredConstructorsMember);
f.setAccessible(true);
f.set(null, method_jlcgdcs);
}
if ((bits & Constants.JLRF_GET) != 0) {
Field f = clazz.getDeclaredField(jlrfGetMember);
f.setAccessible(true);
f.set(null, method_jlrfg);
}
if ((bits & Constants.JLRF_GETLONG) != 0) {
Field f = clazz.getDeclaredField(jlrfGetLongMember);
f.setAccessible(true);
f.set(null, method_jlrfgl);
}
if ((bits & Constants.JLRM_INVOKE) != 0) {
Field f = clazz.getDeclaredField(jlrmInvokeMember);
f.setAccessible(true);
f.set(null, method_jlrmi);
}
if ((bits & Constants.JLOS_HASSTATICINITIALIZER) != 0) {
Field f = clazz.getDeclaredField(jloObjectStream_hasInitializerMethod);
f.setAccessible(true);
f.set(null, method_jloObjectStream_hasInitializerMethod);
}
}
private static final Class<?> EMPTY_CLASS_ARRAY_CLAZZ = Class[].class;
// TODO threads
private static boolean prepared = false;
private static Method method_jlcgdfs, method_jlcgdf, method_jlcgf, method_jlcgdms, method_jlcgdm, method_jlcgm,
method_jlcgdc,
method_jlcgc, method_jlcgmods, method_jlcgms, method_jlcgdcs, method_jlrfg, method_jlrfgl, method_jlrmi,
method_jloObjectStream_hasInitializerMethod;
/**
* Cache the Method objects that will be injected.
*/
private void ensurePreparedForInjection() {
if (!prepared) {
try {
Class<ReflectiveInterceptor> clazz = ReflectiveInterceptor.class;
method_jlcgdfs = clazz.getDeclaredMethod("jlClassGetDeclaredFields", Class.class);
method_jlcgdf = clazz.getDeclaredMethod("jlClassGetDeclaredField", Class.class, String.class);
method_jlcgf = clazz.getDeclaredMethod("jlClassGetField", Class.class, String.class);
method_jlcgdms = clazz.getDeclaredMethod("jlClassGetDeclaredMethods", Class.class);
method_jlcgdm = clazz.getDeclaredMethod("jlClassGetDeclaredMethod", Class.class, String.class,
EMPTY_CLASS_ARRAY_CLAZZ);
method_jlcgm = clazz.getDeclaredMethod("jlClassGetMethod", Class.class, String.class,
EMPTY_CLASS_ARRAY_CLAZZ);
method_jlcgdc = clazz.getDeclaredMethod("jlClassGetDeclaredConstructor", Class.class,
EMPTY_CLASS_ARRAY_CLAZZ);
method_jlcgc = clazz.getDeclaredMethod("jlClassGetConstructor", Class.class, EMPTY_CLASS_ARRAY_CLAZZ);
method_jlcgmods = clazz.getDeclaredMethod("jlClassGetModifiers", Class.class);
method_jlcgms = clazz.getDeclaredMethod("jlClassGetMethods", Class.class);
method_jlcgdcs = clazz.getDeclaredMethod("jlClassGetDeclaredConstructors", Class.class);
method_jlrfg = clazz.getDeclaredMethod("jlrFieldGet", Field.class, Object.class);
method_jlrfgl = clazz.getDeclaredMethod("jlrFieldGetLong", Field.class, Object.class);
method_jlrmi = clazz.getDeclaredMethod("jlrMethodInvoke", Method.class, Object.class, Object[].class);
method_jloObjectStream_hasInitializerMethod = clazz.getDeclaredMethod("jlosHasStaticInitializer",
Class.class);
}
catch (NoSuchMethodException nsme) {
// cant happen, a-hahaha
throw new Impossible(nsme);
}
prepared = true;
}
}
private static boolean needsClientSideRewriting(String slashedClassName) {
if (slashedClassName != null && slashedClassName.charAt(0) == 'o'
&& slashedClassName.startsWith("org/springsource/loaded")) {
return false;
}
return true;
}
/**
* Determine where to watch for changes based on the protectionDomain. Relying on the protectionDomain may prove
* fragile though, as it is up to the classloader in question to create it. Some classloaders will create one
* protectionDomain per 'directory' containing class files (and so the slashedClassName must be appended to the
* codesource). Some classloaders have a protectiondomain per class.
*
* @param protectionDomain the protection domain passed in to the defineclass call
* @param slashedClassName the slashed class name currently being defined
* @return the path to watch for changes to this class
*/
private String getWatchPathFromProtectionDomain(ProtectionDomain protectionDomain, String slashedClassName) {
String watchPath = null;
// System.err.println("protectionDomain=" + protectionDomain + " slashedClassName=" + slashedClassName + " protdom="
// + protectionDomain + " codesource=" + (protectionDomain == null ? "null" : protectionDomain.getCodeSource()));
if (protectionDomain == null) {
if (GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.WARNING)) {
log.warning("Changes to type cannot be tracked: " + slashedClassName + " - no protection domain");
}
}
else {
try {
CodeSource codeSource = protectionDomain.getCodeSource();
if (codeSource == null || codeSource.getLocation() == null) {
if (GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.WARNING)) {
log.warning("null codesource for " + slashedClassName);
}
}
else {
if (GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.FINEST)) {
log.finest("Codesource.getLocation()=" + codeSource.getLocation());
}
// A 'URI is not hierarchical' message can come out when the File ctor is called. Cases seen
// so far:
// GRAILS-10384: relative URL file:../foo/bar - should have built it with new File().toURI.toURL() and not just new URL()
File file = null;
URI uri = null;
try {
file = new File(codeSource.getLocation().getFile());
uri = file.toURI();
}
catch (IllegalArgumentException iae) {
boolean recovered = false;
if (iae.toString().indexOf("URI is not hierarchical") != -1) {
// try another approach...
String uristring = uri.toString();
if (uristring.startsWith("file:../")) {
file = new File(uristring.substring(8)).getAbsoluteFile();
}
else if (uristring.startsWith("file:./")) {
file = new File(uristring.substring(7)).getAbsoluteFile();
}
if (file != null && file.exists()) {
recovered = true;
}
}
if (!recovered) {
System.out.println("Unable to watch file: classname = " + slashedClassName
+ " codesource location = " + codeSource.getLocation() + " ex = " + iae.toString());
return null;
}
}
if (file.isDirectory()) {
file = new File(file, slashedClassName + ".class");
}
else if (file.getName().endsWith(".class")) {
// great! nothing to do
}
else if (file.getName().endsWith(".jar")) {
boolean found = false;
if (GlobalConfiguration.jarsToWatch != null) {
// Check if it is one to watch
String candidate = file.getName();
for (String jarToWatch : GlobalConfiguration.jarsToWatch) {
if (candidate.equals(jarToWatch)) {
found = true;
break;
}
}
}
if (!found && GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.WARNING)) {
log.warning("unable to watch this jar file entry: " + slashedClassName.replace('/', '.')
+ ". Computed location=" + file.toString());
}
if (!found)
return null;
}
else if (file.toString().equals("/groovy/script") || file.toString().equals("\\groovy\\script")) {
// nothing to do, compiled/loaded by a GroovyClassLoader$InnerLoader - there is nothing to watch. If the type is to be
// reloaded we will have to be told via an alternate route
return null;
}
else if (!file.toString().endsWith(".class")) {
// GRAILS-9076: it ended in .groovy
// GRAILS-9069/GRAILS-9070: it was /groovy/shell
// something other than a class, no point in watching it
return null;
}
else {
throw new UnsupportedOperationException("unable to watch " + slashedClassName.replace('/', '.')
+ ". Computed location=" + file.toString());
}
watchPath = file.toString();
if (GlobalConfiguration.isRuntimeLogging && log.isLoggable(Level.INFO)) {
log.info("Watched location for changes to " + slashedClassName + " is " + watchPath);
}
}
}
catch (Exception e) {
throw new IllegalStateException("Unexpected problem processing URI ", e);
}
}
return watchPath;
}
private void logPreProcess(ClassLoader classLoader, String slashedClassName, TypeRegistry typeRegistry) {
String clname = classLoader == null ? "null" : classLoader.getClass().getName();
if (clname.indexOf('.') != -1) {
clname = clname.substring(clname.lastIndexOf('.') + 1);
}
log.info("SpringLoaded preprocessing: classname=" + slashedClassName + " classloader=" + clname
+ " typeRegistry=" + typeRegistry);
}
public static List<Plugin> getGlobalPlugins() {
if (plugins == null) {
plugins = new ArrayList<Plugin>();
// Ordering is important here (for some of the plugins) - try to do the lowest level things first in case the higher level
// operations cause something to happen that will drive the lower level function. For example, the JVM plugin clears the
// Introspector class which is used by the Spring CachedIntrospectionResults class, which is used by the Grails ClassPropertyFetcher (
// through its calls to BeanUtils). If you don't clear the lower level things first then the higher level reinit operations will
// still see the old (incorrect) results.
plugins.add(new JVMPlugin());
plugins.add(new SpringPlugin());
plugins.add(new GroovyPlugin());
plugins.add(new CglibPlugin());
// Not used right now, grails mechanisms are clearing the state that this plugin is trying to
// plugins.add(new GrailsPlugin());
List<String> extraGlobalPlugins = GlobalConfiguration.pluginClassnameList;
if (extraGlobalPlugins != null) {
for (String globalPlugin : extraGlobalPlugins) {
try {
Class<?> pluginClass = Class.forName(globalPlugin, false,
SpringLoadedPreProcessor.class.getClassLoader());
plugins.add((Plugin) pluginClass.newInstance());
}
catch (ClassNotFoundException e) {
System.err.println("Unexpected problem loading global plugin:" + globalPlugin);
e.printStackTrace(System.err);
}
catch (InstantiationException e) {
System.err.println("Unexpected problem loading global plugin:" + globalPlugin);
e.printStackTrace(System.err);
}
catch (IllegalAccessException e) {
System.err.println("Unexpected problem loading global plugin:" + globalPlugin);
e.printStackTrace(System.err);
}
}
}
}
return plugins;
}
private static List<IsReloadableTypePlugin> isReloadableTypePlugins = null;
public static List<IsReloadableTypePlugin> getIsReloadableTypePlugins() {
if (isReloadableTypePlugins == null) {
synchronized (SpringLoadedPreProcessor.class) {
if (isReloadableTypePlugins == null) {
isReloadableTypePlugins = new ArrayList<IsReloadableTypePlugin>();
for (Plugin p : getGlobalPlugins()) {
if (p instanceof IsReloadableTypePlugin) {
isReloadableTypePlugins.add((IsReloadableTypePlugin) p);
}
}
}
}
}
return isReloadableTypePlugins;
}
public static void registerGlobalPlugin(Plugin instance) {
getGlobalPlugins(); // trigger initialization
plugins.add(instance);
isReloadableTypePlugins = null; // reset this cached value
}
public static void unregisterGlobalPlugin(Plugin instance) {
getGlobalPlugins(); // trigger initialization
plugins.remove(instance);
isReloadableTypePlugins = null; // reset this cached value
}
}
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