1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/jaxws_classes/com/sun/xml/internal/bind/v2/runtime/reflect/opt/Injector.java Wed Apr 27 01:27:09 2016 +0800
1.3 @@ -0,0 +1,305 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package com.sun.xml.internal.bind.v2.runtime.reflect.opt;
1.30 +
1.31 +import java.lang.reflect.InvocationTargetException;
1.32 +import java.lang.reflect.Method;
1.33 +import java.lang.ref.WeakReference;
1.34 +import java.security.AccessController;
1.35 +import java.security.PrivilegedAction;
1.36 +import java.util.concurrent.locks.Lock;
1.37 +import java.util.concurrent.locks.ReentrantReadWriteLock;
1.38 +import java.util.HashMap;
1.39 +import java.util.Map;
1.40 +import java.util.WeakHashMap;
1.41 +import java.util.logging.Level;
1.42 +import java.util.logging.Logger;
1.43 +
1.44 +import com.sun.xml.internal.bind.Util;
1.45 +import com.sun.xml.internal.bind.v2.runtime.reflect.Accessor;
1.46 +
1.47 +/**
1.48 + * A {@link ClassLoader} used to "inject" optimized accessor classes
1.49 + * into the VM.
1.50 + *
1.51 + * <p>
1.52 + * Its parent class loader needs to be set to the one that can see the user
1.53 + * class.
1.54 + *
1.55 + * @author Kohsuke Kawaguchi
1.56 + */
1.57 +final class Injector {
1.58 +
1.59 + /**
1.60 + * {@link Injector}s keyed by their parent {@link ClassLoader}.
1.61 + *
1.62 + * We only need one injector per one user class loader.
1.63 + */
1.64 + private static final ReentrantReadWriteLock irwl = new ReentrantReadWriteLock();
1.65 + private static final Lock ir = irwl.readLock();
1.66 + private static final Lock iw = irwl.writeLock();
1.67 + private static final Map<ClassLoader, WeakReference<Injector>> injectors =
1.68 + new WeakHashMap<ClassLoader, WeakReference<Injector>>();
1.69 + private static final Logger logger = Util.getClassLogger();
1.70 +
1.71 + /**
1.72 + * Injects a new class into the given class loader.
1.73 + *
1.74 + * @return null
1.75 + * if it fails to inject.
1.76 + */
1.77 + static Class inject(ClassLoader cl, String className, byte[] image) {
1.78 + Injector injector = get(cl);
1.79 + if (injector != null) {
1.80 + return injector.inject(className, image);
1.81 + } else {
1.82 + return null;
1.83 + }
1.84 + }
1.85 +
1.86 + /**
1.87 + * Returns the already injected class, or null.
1.88 + */
1.89 + static Class find(ClassLoader cl, String className) {
1.90 + Injector injector = get(cl);
1.91 + if (injector != null) {
1.92 + return injector.find(className);
1.93 + } else {
1.94 + return null;
1.95 + }
1.96 + }
1.97 +
1.98 + /**
1.99 + * Gets or creates an {@link Injector} for the given class loader.
1.100 + *
1.101 + * @return null
1.102 + * if it fails.
1.103 + */
1.104 + private static Injector get(ClassLoader cl) {
1.105 + Injector injector = null;
1.106 + WeakReference<Injector> wr;
1.107 + ir.lock();
1.108 + try {
1.109 + wr = injectors.get(cl);
1.110 + } finally {
1.111 + ir.unlock();
1.112 + }
1.113 + if (wr != null) {
1.114 + injector = wr.get();
1.115 + }
1.116 + if (injector == null) {
1.117 + try {
1.118 + wr = new WeakReference<Injector>(injector = new Injector(cl));
1.119 + iw.lock();
1.120 + try {
1.121 + if (!injectors.containsKey(cl)) {
1.122 + injectors.put(cl, wr);
1.123 + }
1.124 + } finally {
1.125 + iw.unlock();
1.126 + }
1.127 + } catch (SecurityException e) {
1.128 + logger.log(Level.FINE, "Unable to set up a back-door for the injector", e);
1.129 + return null;
1.130 + }
1.131 + }
1.132 + return injector;
1.133 + }
1.134 + /**
1.135 + * Injected classes keyed by their names.
1.136 + */
1.137 + private final Map<String, Class> classes = new HashMap<String, Class>();
1.138 + private final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
1.139 + private final Lock r = rwl.readLock();
1.140 + private final Lock w = rwl.writeLock();
1.141 + private final ClassLoader parent;
1.142 + /**
1.143 + * True if this injector is capable of injecting accessors.
1.144 + * False otherwise, which happens if this classloader can't see {@link Accessor}.
1.145 + */
1.146 + private final boolean loadable;
1.147 + private static final Method defineClass;
1.148 + private static final Method resolveClass;
1.149 + private static final Method findLoadedClass;
1.150 +
1.151 + static {
1.152 + try {
1.153 + defineClass = ClassLoader.class.getDeclaredMethod("defineClass", String.class, byte[].class, Integer.TYPE, Integer.TYPE);
1.154 + resolveClass = ClassLoader.class.getDeclaredMethod("resolveClass", Class.class);
1.155 + findLoadedClass = ClassLoader.class.getDeclaredMethod("findLoadedClass", String.class);
1.156 + } catch (NoSuchMethodException e) {
1.157 + // impossible
1.158 + throw new NoSuchMethodError(e.getMessage());
1.159 + }
1.160 + AccessController.doPrivileged(new PrivilegedAction<Void>() {
1.161 +
1.162 + @Override
1.163 + public Void run() {
1.164 + // TODO: check security implication
1.165 + // do these setAccessible allow anyone to call these methods freely?s
1.166 + defineClass.setAccessible(true);
1.167 + resolveClass.setAccessible(true);
1.168 + findLoadedClass.setAccessible(true);
1.169 + return null;
1.170 + }
1.171 + });
1.172 + }
1.173 +
1.174 + private Injector(ClassLoader parent) {
1.175 + this.parent = parent;
1.176 + assert parent != null;
1.177 +
1.178 + boolean loadableCheck = false;
1.179 +
1.180 + try {
1.181 + loadableCheck = parent.loadClass(Accessor.class.getName()) == Accessor.class;
1.182 + } catch (ClassNotFoundException e) {
1.183 + // not loadable
1.184 + }
1.185 +
1.186 + this.loadable = loadableCheck;
1.187 + }
1.188 +
1.189 + @SuppressWarnings("LockAcquiredButNotSafelyReleased")
1.190 + private Class inject(String className, byte[] image) {
1.191 + if (!loadable) // this injector cannot inject anything
1.192 + {
1.193 + return null;
1.194 + }
1.195 +
1.196 + boolean wlocked = false;
1.197 + boolean rlocked = false;
1.198 + try {
1.199 +
1.200 + r.lock();
1.201 + rlocked = true;
1.202 +
1.203 + Class c = classes.get(className);
1.204 +
1.205 + // Unlock now during the findLoadedClass process to avoid
1.206 + // deadlocks
1.207 + r.unlock();
1.208 + rlocked = false;
1.209 +
1.210 + //find loaded class from classloader
1.211 + if (c == null) {
1.212 +
1.213 + try {
1.214 + c = (Class) findLoadedClass.invoke(parent, className.replace('/', '.'));
1.215 + } catch (IllegalArgumentException e) {
1.216 + logger.log(Level.FINE, "Unable to find " + className, e);
1.217 + } catch (IllegalAccessException e) {
1.218 + logger.log(Level.FINE, "Unable to find " + className, e);
1.219 + } catch (InvocationTargetException e) {
1.220 + Throwable t = e.getTargetException();
1.221 + logger.log(Level.FINE, "Unable to find " + className, t);
1.222 + }
1.223 +
1.224 + if (c != null) {
1.225 +
1.226 + w.lock();
1.227 + wlocked = true;
1.228 +
1.229 + classes.put(className, c);
1.230 +
1.231 + w.unlock();
1.232 + wlocked = false;
1.233 +
1.234 + return c;
1.235 + }
1.236 + }
1.237 +
1.238 + if (c == null) {
1.239 +
1.240 + r.lock();
1.241 + rlocked = true;
1.242 +
1.243 + c = classes.get(className);
1.244 +
1.245 + // Unlock now during the define/resolve process to avoid
1.246 + // deadlocks
1.247 + r.unlock();
1.248 + rlocked = false;
1.249 +
1.250 + if (c == null) {
1.251 +
1.252 + // we need to inject a class into the
1.253 + try {
1.254 + c = (Class) defineClass.invoke(parent, className.replace('/', '.'), image, 0, image.length);
1.255 + resolveClass.invoke(parent, c);
1.256 + } catch (IllegalAccessException e) {
1.257 + logger.log(Level.FINE, "Unable to inject " + className, e);
1.258 + return null;
1.259 + } catch (InvocationTargetException e) {
1.260 + Throwable t = e.getTargetException();
1.261 + if (t instanceof LinkageError) {
1.262 + logger.log(Level.FINE, "duplicate class definition bug occured? Please report this : " + className, t);
1.263 + } else {
1.264 + logger.log(Level.FINE, "Unable to inject " + className, t);
1.265 + }
1.266 + return null;
1.267 + } catch (SecurityException e) {
1.268 + logger.log(Level.FINE, "Unable to inject " + className, e);
1.269 + return null;
1.270 + } catch (LinkageError e) {
1.271 + logger.log(Level.FINE, "Unable to inject " + className, e);
1.272 + return null;
1.273 + }
1.274 +
1.275 + w.lock();
1.276 + wlocked = true;
1.277 +
1.278 + // During the time we were unlocked, we could have tried to
1.279 + // load the class from more than one thread. Check now to see
1.280 + // if someone else beat us to registering this class
1.281 + if (!classes.containsKey(className)) {
1.282 + classes.put(className, c);
1.283 + }
1.284 +
1.285 + w.unlock();
1.286 + wlocked = false;
1.287 + }
1.288 + }
1.289 + return c;
1.290 + } finally {
1.291 + if (rlocked) {
1.292 + r.unlock();
1.293 + }
1.294 + if (wlocked) {
1.295 + w.unlock();
1.296 + }
1.297 + }
1.298 + }
1.299 +
1.300 + private Class find(String className) {
1.301 + r.lock();
1.302 + try {
1.303 + return classes.get(className);
1.304 + } finally {
1.305 + r.unlock();
1.306 + }
1.307 + }
1.308 +}
