Mercurial > hg > truffle
view test/compiler/jsr292/methodHandleExceptions/ByteClassLoader.java @ 20279:870c03421152
8049426: Minor cleanups after G1 class unloading
Reviewed-by: stefank, brutisso
author | ehelin |
---|---|
date | Wed, 09 Jul 2014 16:44:30 +0200 |
parents | 9d15b81d5d1b |
children |
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import java.io.BufferedOutputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.net.URL; import java.net.URLClassLoader; import java.util.jar.JarEntry; import java.util.jar.JarOutputStream; /* * Copyright (c) 2013, 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. * * 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. * */ /** * A ByteClassLoader is used to define classes from collections of bytes, as * well as loading classes in the usual way. It includes options to write the * classes to files in a jar, or to read the classes from jars in a later or * debugging run. * * If Boolean property byteclassloader.verbose is true, be chatty about jar * file operations. * */ public class ByteClassLoader extends URLClassLoader { final static boolean verbose = Boolean.getBoolean("byteclassloader.verbose"); final boolean read; final JarOutputStream jos; final String jar_name; /** * Make a new ByteClassLoader. * * @param jar_name Basename of jar file to be read/written by this classloader. * @param read If true, read classes from jar file instead of from parameter. * @param write If true, write classes to jar files for offline study/use. * * @throws FileNotFoundException * @throws IOException */ public ByteClassLoader(String jar_name, boolean read, boolean write) throws FileNotFoundException, IOException { super(read ? new URL[]{new URL("file:" + jar_name + ".jar")} : new URL[0]); this.read = read; this.jar_name = jar_name; this.jos = write ? new JarOutputStream( new BufferedOutputStream( new FileOutputStream(jar_name + ".jar"))) : null; if (read && write) { throw new Error("At most one of read and write may be true."); } } private static void writeJarredFile(JarOutputStream jos, String file, String suffix, byte[] bytes) { String fileName = file.replace(".", "/") + "." + suffix; JarEntry ze = new JarEntry(fileName); try { ze.setSize(bytes.length); jos.putNextEntry(ze); jos.write(bytes); jos.closeEntry(); } catch (IOException e) { throw new RuntimeException(e); } } /** * (pre)load class name using classData for the definition. * * @param name * @param classData * @return */ public Class<?> loadBytes(String name, byte[] classData) throws ClassNotFoundException { if (jos != null) { if (verbose) { System.out.println("ByteClassLoader: writing " + name); } writeJarredFile(jos, name, "class", classData); } Class<?> clazz = null; if (read) { if (verbose) { System.out.println("ByteClassLoader: reading " + name + " from " + jar_name); } clazz = loadClass(name); } else { clazz = defineClass(name, classData, 0, classData.length); resolveClass(clazz); } return clazz; } public void close() { if (jos != null) { try { if (verbose) { System.out.println("ByteClassLoader: closing " + jar_name); } jos.close(); } catch (IOException ex) { } } } }