jdk8-mips64-public/jaxws: comparison src/share/jaxws_classes/com/sun/xml/internal/bind/v2/runtime/reflect/opt/Injector.java

-:88b85470e72c
+:f50545b5e2f1
+/*
+* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+*
+* This code is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License version 2 only, as
+* published by the Free Software Foundation.  Oracle designates this
+* particular file as subject to the "Classpath" exception as provided
+* by Oracle in the LICENSE file that accompanied this code.
+*
+* This code is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+* version 2 for more details (a copy is included in the LICENSE file that
+* accompanied this code).
+*
+* You should have received a copy of the GNU General Public License version
+* 2 along with this work; if not, write to the Free Software Foundation,
+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+*
+* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+* or visit www.oracle.com if you need additional information or have any
+* questions.
+*/
+package com.sun.xml.internal.bind.v2.runtime.reflect.opt;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.ref.WeakReference;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.WeakHashMap;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import com.sun.xml.internal.bind.Util;
+import com.sun.xml.internal.bind.v2.runtime.reflect.Accessor;
+/**
+* A {@link ClassLoader} used to "inject" optimized accessor classes
+* into the VM.
+*
+* <p>
+* Its parent class loader needs to be set to the one that can see the user
+* class.
+*
+* @author Kohsuke Kawaguchi
+*/
+final class Injector {
+/**
+* {@link Injector}s keyed by their parent {@link ClassLoader}.
+*
+* We only need one injector per one user class loader.
+*/
+private static final ReentrantReadWriteLock irwl = new ReentrantReadWriteLock();
+private static final Lock ir = irwl.readLock();
+private static final Lock iw = irwl.writeLock();
+private static final Map<ClassLoader, WeakReference<Injector>> injectors =
+new WeakHashMap<ClassLoader, WeakReference<Injector>>();
+private static final Logger logger = Util.getClassLogger();
+/**
+* Injects a new class into the given class loader.
+*
+* @return null
+*      if it fails to inject.
+*/
+static Class inject(ClassLoader cl, String className, byte[] image) {
+Injector injector = get(cl);
+if (injector != null) {
+return injector.inject(className, image);
+} else {
+return null;
+}
+}
+/**
+* Returns the already injected class, or null.
+*/
+static Class find(ClassLoader cl, String className) {
+Injector injector = get(cl);
+if (injector != null) {
+return injector.find(className);
+} else {
+return null;
+}
+}
+/**
+* Gets or creates an {@link Injector} for the given class loader.
+*
+* @return null
+*      if it fails.
+*/
+private static Injector get(ClassLoader cl) {
+Injector injector = null;
+WeakReference<Injector> wr;
+ir.lock();
+try {
+wr = injectors.get(cl);
+} finally {
+ir.unlock();
+}
+if (wr != null) {
+injector = wr.get();
+}
+if (injector == null) {
+try {
+wr = new WeakReference<Injector>(injector = new Injector(cl));
+iw.lock();
+try {
+if (!injectors.containsKey(cl)) {
+injectors.put(cl, wr);
+}
+} finally {
+iw.unlock();
+}
+} catch (SecurityException e) {
+logger.log(Level.FINE, "Unable to set up a back-door for the injector", e);
+return null;
+}
+}
+return injector;
+}
+/**
+* Injected classes keyed by their names.
+*/
+private final Map<String, Class> classes = new HashMap<String, Class>();
+private final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
+private final Lock r = rwl.readLock();
+private final Lock w = rwl.writeLock();
+private final ClassLoader parent;
+/**
+* True if this injector is capable of injecting accessors.
+* False otherwise, which happens if this classloader can't see {@link Accessor}.
+*/
+private final boolean loadable;
+private static final Method defineClass;
+private static final Method resolveClass;
+private static final Method findLoadedClass;
+static {
+try {
+defineClass = ClassLoader.class.getDeclaredMethod("defineClass", String.class, byte[].class, Integer.TYPE, Integer.TYPE);
+resolveClass = ClassLoader.class.getDeclaredMethod("resolveClass", Class.class);
+findLoadedClass = ClassLoader.class.getDeclaredMethod("findLoadedClass", String.class);
+} catch (NoSuchMethodException e) {
+// impossible
+throw new NoSuchMethodError(e.getMessage());
+}
+AccessController.doPrivileged(new PrivilegedAction<Void>() {
+public Void run() {
+// TODO: check security implication
+// do these setAccessible allow anyone to call these methods freely?s
+defineClass.setAccessible(true);
+resolveClass.setAccessible(true);
+findLoadedClass.setAccessible(true);
+return null;
+}
+});
+}
+private Injector(ClassLoader parent) {
+this.parent = parent;
+assert parent != null;
+boolean loadableCheck = false;
+try {
+loadableCheck = parent.loadClass(Accessor.class.getName()) == Accessor.class;
+} catch (ClassNotFoundException e) {
+// not loadable
+}
+this.loadable = loadableCheck;
+}
+@SuppressWarnings("LockAcquiredButNotSafelyReleased")
+private Class inject(String className, byte[] image) {
+if (!loadable) // this injector cannot inject anything
+{
+return null;
+}
+boolean wlocked = false;
+boolean rlocked = false;
+try {
+r.lock();
+rlocked = true;
+Class c = classes.get(className);
+// Unlock now during the findLoadedClass process to avoid
+// deadlocks
+r.unlock();
+rlocked = false;
+//find loaded class from classloader
+if (c == null) {
+try {
+c = (Class) findLoadedClass.invoke(parent, className.replace('/', '.'));
+} catch (IllegalArgumentException e) {
+logger.log(Level.FINE, "Unable to find " + className, e);
+} catch (IllegalAccessException e) {
+logger.log(Level.FINE, "Unable to find " + className, e);
+} catch (InvocationTargetException e) {
+Throwable t = e.getTargetException();
+logger.log(Level.FINE, "Unable to find " + className, t);
+}
+if (c != null) {
+w.lock();
+wlocked = true;
+classes.put(className, c);
+w.unlock();
+wlocked = false;
+return c;
+}
+}
+if (c == null) {
+r.lock();
+rlocked = true;
+c = classes.get(className);
+// Unlock now during the define/resolve process to avoid
+// deadlocks
+r.unlock();
+rlocked = false;
+if (c == null) {
+// we need to inject a class into the
+try {
+c = (Class) defineClass.invoke(parent, className.replace('/', '.'), image, 0, image.length);
+resolveClass.invoke(parent, c);
+} catch (IllegalAccessException e) {
+logger.log(Level.FINE, "Unable to inject " + className, e);
+return null;
+} catch (InvocationTargetException e) {
+Throwable t = e.getTargetException();
+if (t instanceof LinkageError) {
+logger.log(Level.FINE, "duplicate class definition bug occured? Please report this : " + className, t);
+} else {
+logger.log(Level.FINE, "Unable to inject " + className, t);
+}
+return null;
+} catch (SecurityException e) {
+logger.log(Level.FINE, "Unable to inject " + className, e);
+return null;
+} catch (LinkageError e) {
+logger.log(Level.FINE, "Unable to inject " + className, e);
+return null;
+}
+w.lock();
+wlocked = true;
+// During the time we were unlocked, we could have tried to
+// load the class from more than one thread. Check now to see
+// if someone else beat us to registering this class
+if (!classes.containsKey(className)) {
+classes.put(className, c);
+}
+w.unlock();
+wlocked = false;
+}
+}
+return c;
+} finally {
+if (rlocked) {
+r.unlock();
+}
+if (wlocked) {
+w.unlock();
+}
+}
+}
+private Class find(String className) {
+r.lock();
+try {
+return classes.get(className);
+} finally {
+r.unlock();
+}
+}
+}

Mercurial > jdk8-mips64-public > jaxws / file comparison

comparison: src/share/jaxws_classes/com/sun/xml/internal/bind/v2/runtime/reflect/opt/Injector.java

src/share/jaxws_classes/com/sun/xml/internal/bind/v2/runtime/reflect/opt/Injector.java