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/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.tools.jlink.internal.plugins;
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import java.io.BufferedReader;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.UncheckedIOException;
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import java.nio.charset.StandardCharsets;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.TreeSet;
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import java.util.function.Predicate;
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import java.util.stream.Collectors;
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import jdk.tools.jlink.plugin.TransformerPlugin;
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import jdk.tools.jlink.plugin.Pool;
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import jdk.tools.jlink.plugin.Pool.ModuleDataType;
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import jdk.tools.jlink.internal.Utils;
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import jdk.tools.jlink.plugin.PluginException;
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/**
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*
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* Exclude VM plugin
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*/
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public final class ExcludeVMPlugin implements TransformerPlugin {
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private static final class JvmComparator implements Comparator<Jvm> {
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@Override
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public int compare(Jvm o1, Jvm o2) {
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return o1.getEfficience() - o2.getEfficience();
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}
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}
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private enum Jvm {
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// The efficience order server - client - minimal.
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SERVER("server", 3), CLIENT("client", 2), MINIMAL("minimal", 1);
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private final String name;
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private final int efficience;
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Jvm(String name, int efficience) {
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this.name = name;
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this.efficience = efficience;
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}
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private String getName() {
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return name;
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}
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private int getEfficience() {
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return efficience;
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}
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}
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private static final String JVM_CFG = "jvm.cfg";
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public static final String NAME = "vm";
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private static final String ALL = "all";
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private static final String CLIENT = "client";
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private static final String SERVER = "server";
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private static final String MINIMAL = "minimal";
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private Predicate<String> predicate;
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private Jvm target;
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private boolean keepAll;
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@Override
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public String getName() {
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return NAME;
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}
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/**
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* VM paths:
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* /java.base/native/{architecture}/{server|client|minimal}/{shared lib}
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* e.g.: /java.base/native/amd64/server/libjvm.so
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* /java.base/native/server/libjvm.dylib
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*/
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private List<Pool.ModuleData> getVMs(Pool in) {
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String jvmlib = jvmlib();
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List<Pool.ModuleData> ret = in.getModule("java.base").getContent().stream().filter((t) -> {
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return t.getPath().endsWith("/" + jvmlib);
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}).collect(Collectors.toList());
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return ret;
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}
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@Override
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public void visit(Pool in, Pool out) {
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String jvmlib = jvmlib();
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TreeSet<Jvm> existing = new TreeSet<>(new JvmComparator());
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TreeSet<Jvm> removed = new TreeSet<>(new JvmComparator());
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if (!keepAll) {
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// First retrieve all available VM names and removed VM
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List<Pool.ModuleData> jvms = getVMs(in);
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for (Jvm jvm : Jvm.values()) {
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for (Pool.ModuleData md : jvms) {
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if (md.getPath().endsWith("/" + jvm.getName() + "/" + jvmlib)) {
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existing.add(jvm);
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if (isRemoved(md)) {
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removed.add(jvm);
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}
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}
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}
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}
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}
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// Check that target exists
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if (!keepAll) {
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if (!existing.contains(target)) {
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throw new PluginException("Selected VM " + target.getName() + " doesn't exist.");
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}
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}
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// Rewrite the jvm.cfg file.
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in.visit((file) -> {
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if (!keepAll) {
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if (file.getType().equals(ModuleDataType.NATIVE_LIB)) {
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if (file.getPath().endsWith(JVM_CFG)) {
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try {
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file = handleJvmCfgFile(file, existing, removed);
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} catch (IOException ex) {
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throw new UncheckedIOException(ex);
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}
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}
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}
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file = isRemoved(file) ? null : file;
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}
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return file;
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}, out);
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}
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private boolean isRemoved(Pool.ModuleData file) {
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return !predicate.test(file.getPath());
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}
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@Override
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public Set<PluginType> getType() {
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Set<PluginType> set = new HashSet<>();
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set.add(CATEGORY.FILTER);
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return Collections.unmodifiableSet(set);
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}
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@Override
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public String getDescription() {
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return PluginsResourceBundle.getDescription(NAME);
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}
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@Override
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public boolean hasArguments() {
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return true;
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}
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@Override
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public String getArgumentsDescription() {
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return PluginsResourceBundle.getArgument(NAME);
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}
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@Override
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public void configure(Map<String, String> config) {
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try {
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String value = config.get(NAME);
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String exclude = "";
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switch (value) {
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case ALL: {
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// no filter.
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keepAll = true;
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break;
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}
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case CLIENT: {
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target = Jvm.CLIENT;
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exclude = "/java.base/native*server/*,/java.base/native*minimal/*";
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break;
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}
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case SERVER: {
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target = Jvm.SERVER;
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exclude = "/java.base/native*client/*,/java.base/native*minimal/*";
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break;
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}
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case MINIMAL: {
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target = Jvm.MINIMAL;
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exclude = "/java.base/native*server/*,/java.base/native*client/*";
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break;
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}
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default: {
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throw new PluginException("Unknown option " + value);
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}
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}
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predicate = new ResourceFilter(Utils.listParser.apply(exclude), true);
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} catch (IOException ex) {
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throw new UncheckedIOException(ex);
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}
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}
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private Pool.ModuleData handleJvmCfgFile(Pool.ModuleData orig,
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TreeSet<Jvm> existing,
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TreeSet<Jvm> removed) throws IOException {
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if (keepAll) {
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return orig;
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}
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StringBuilder builder = new StringBuilder();
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// Keep comments
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try (BufferedReader reader
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= new BufferedReader(new InputStreamReader(orig.stream(),
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StandardCharsets.UTF_8))) {
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reader.lines().forEach((s) -> {
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if (s.startsWith("#")) {
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builder.append(s).append("\n");
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}
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});
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}
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TreeSet<Jvm> remaining = new TreeSet<>(new JvmComparator());
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// Add entry in jvm.cfg file from the more efficient to less efficient.
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for (Jvm platform : existing) {
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if (!removed.contains(platform)) {
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remaining.add(platform);
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builder.append("-").append(platform.getName()).append(" KNOWN\n");
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}
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}
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// removed JVM are aliased to the most efficient remaining JVM (last one).
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// The order in the file is from most to less efficient platform
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for (Jvm platform : removed.descendingSet()) {
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builder.append("-").append(platform.getName()).
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append(" ALIASED_TO -").
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append(remaining.last().getName()).append("\n");
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}
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byte[] content = builder.toString().getBytes(StandardCharsets.UTF_8);
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return Pool.newImageFile(orig.getModule(),
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orig.getPath(),
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orig.getType(),
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new ByteArrayInputStream(content), content.length);
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}
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private static String jvmlib() {
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String lib = "libjvm.so";
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if (isWindows()) {
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lib = "jvm.dll";
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} else if (isMac()) {
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lib = "libjvm.dylib";
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}
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return lib;
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}
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private static boolean isWindows() {
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return System.getProperty("os.name").startsWith("Windows");
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}
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private static boolean isMac() {
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return System.getProperty("os.name").startsWith("Mac OS");
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}
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}
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