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org.jboss.modules.JDKSpecific Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2016 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.jboss.modules;
import static java.nio.file.FileVisitResult.CONTINUE;
import static java.nio.file.FileVisitResult.SKIP_SUBTREE;
import static java.security.AccessController.doPrivileged;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.file.FileSystems;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.stream.Stream;
import java.util.jar.JarFile;
/**
* JDK-specific classes which are replaced for different JDK major versions. This one is for Java 9 only.
*
* @author David M. Lloyd
* @author Richard Opalka
*/
final class JDKSpecific {
// === private fields and data ===
static final Set MODULES_PACKAGES = new HashSet<>(Arrays.asList(
"org/jboss/modules",
"org/jboss/modules/filter",
"org/jboss/modules/log",
"org/jboss/modules/management",
"org/jboss/modules/ref"
));
static final StackWalker STACK_WALKER = doPrivileged((PrivilegedAction) () -> StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE));
static final ClassLoader PLATFORM_CLASS_LOADER = doPrivileged((PrivilegedAction) ClassLoader::getPlatformClassLoader);
static final ClassLoader OUR_CLASS_LOADER = JDKSpecific.class.getClassLoader();
// === the actual JDK-specific API ===
static JarFile getJarFile(final String name, final boolean verify) throws IOException {
return new JarFile(new File(name), verify, JarFile.OPEN_READ, JarFile.runtimeVersion());
}
static JarFile getJarFile(final File name, final boolean verify) throws IOException {
return new JarFile(name, verify, JarFile.OPEN_READ, JarFile.runtimeVersion());
}
static Class getCallingUserClass() {
return STACK_WALKER.walk(stream -> stream.skip(1)
.filter(s -> !s.getDeclaringClass().equals(org.jboss.modules.Module.class))
.findFirst().get().getDeclaringClass());
}
static Class getCallingClass() {
return STACK_WALKER.walk(JDKSpecific::processFrame);
}
static boolean isParallelCapable(ConcurrentClassLoader cl) {
// TODO this API isn't merged yet
// return cl.isParallelCapable();
return ConcurrentClassLoader.getLockForClass(cl, "$TEST$") != cl;
}
static Package getPackage(ClassLoader cl, String packageName) {
return cl.getDefinedPackage(packageName);
}
static Set getJDKPaths() {
Set pathSet = new FastCopyHashSet<>(1024);
processRuntimeImages(pathSet);
// TODO: Remove this stuff once jboss-modules is itself a module
final String javaClassPath = AccessController.doPrivileged(new PropertyReadAction("java.class.path"));
JDKPaths.processClassPathItem(javaClassPath, new FastCopyHashSet<>(1024), pathSet);
pathSet.addAll(MODULES_PACKAGES);
return pathSet;
}
static LocalLoader getSystemLocalLoader() {
return new LocalLoader() {
public Class loadClassLocal(final String name, final boolean resolve) {
try {
return Class.forName(name, resolve, getPlatformClassLoader());
} catch (ClassNotFoundException ignored) {
try {
return Class.forName(name, resolve, OUR_CLASS_LOADER);
} catch (ClassNotFoundException e) {
return null;
}
}
}
public Package loadPackageLocal(final String name) {
final Package pkg = getPackage(getPlatformClassLoader(), name);
return pkg != null ? pkg : getPackage(OUR_CLASS_LOADER, name);
}
public List loadResourceLocal(final String name) {
final Enumeration urls;
try {
urls = getSystemResources(name);
} catch (IOException e) {
return Collections.emptyList();
}
final List list = new ArrayList();
while (urls.hasMoreElements()) {
list.add(new URLResource(urls.nextElement()));
}
return list;
}
};
}
static ClassLoader getPlatformClassLoader() {
return PLATFORM_CLASS_LOADER;
}
static URL getSystemResource(final String name) {
final URL resource = getPlatformClassLoader().getResource(name);
return resource != null ? resource : OUR_CLASS_LOADER.getResource(name);
}
static Enumeration getSystemResources(final String name) throws IOException {
final Enumeration resources = getPlatformClassLoader().getResources(name);
return resources != null && resources.hasMoreElements() ? resources : OUR_CLASS_LOADER.getResources(name);
}
static InputStream getSystemResourceAsStream(final String name) {
final InputStream stream = getPlatformClassLoader().getResourceAsStream(name);
return stream != null ? stream : OUR_CLASS_LOADER.getSystemResourceAsStream(name);
}
static Class getSystemClass(@SuppressWarnings("unused") final ConcurrentClassLoader caller, final String className) throws ClassNotFoundException {
try {
return getPlatformClassLoader().loadClass(className);
} catch (ClassNotFoundException ignored) {
return OUR_CLASS_LOADER.loadClass(className);
}
}
// === nested util stuff, non-API ===
private static Class processFrame(Stream stream) {
final Iterator iterator = stream.iterator();
if (! iterator.hasNext()) return null;
iterator.next();
if (! iterator.hasNext()) return null;
Class testClass = iterator.next().getDeclaringClass();
while (iterator.hasNext()) {
final Class item = iterator.next().getDeclaringClass();
if (testClass != item) {
return item;
}
}
return null;
}
private static void processRuntimeImages(final Set jarSet) {
try {
for (final Path root : FileSystems.getFileSystem(new URI("jrt:/")).getRootDirectories()) {
Files.walkFileTree(root, new JrtFileVisitor(jarSet));
}
} catch (final URISyntaxException |IOException e) {
throw new IllegalStateException("Unable to process java runtime images");
}
}
private static class JrtFileVisitor implements FileVisitor {
private static final String SLASH = "/";
private static final String PACKAGES = "/packages";
private final Set pathSet;
private JrtFileVisitor(final Set pathSet) {
this.pathSet = pathSet;
}
@Override
public FileVisitResult preVisitDirectory(final Path dir, final BasicFileAttributes attrs) throws IOException {
final String d = dir.toString();
return d.equals(SLASH) || d.startsWith(PACKAGES) ? CONTINUE : SKIP_SUBTREE;
}
@Override
public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
String f = file.toString();
pathSet.add(f.substring(PACKAGES.length() + 1, f.lastIndexOf(SLASH)).replace('.', '/'));
return CONTINUE;
}
@Override
public FileVisitResult visitFileFailed(final Path file, final IOException exc) throws IOException {
return CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(final Path dir, final IOException exc) throws IOException {
return CONTINUE;
}
}
}
