JDK 11 jdk.jlink.jmod - JLink Tool

JDK 11 jdk.jlink.jmod is the JMOD file for JDK 11 JLink tool, which can be invoked by the "jlink" command.

JDK 11 JLink tool compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\jdk.jlink.jmod.

JDK 11 JLink tool compiled class files are also linked and stored in the \fyicenter\jdk-11.0.1\lib\modules JImage file.

JDK 11 JLink tool source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\jdk.jlink.

You can click and view the content of each source code file in the list below.

✍: FYIcenter

jdk/tools/jlink/internal/plugins/ExcludeVMPlugin.java

/*
 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */
package jdk.tools.jlink.internal.plugins;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UncheckedIOException;
import java.nio.charset.StandardCharsets;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.TreeSet;
import java.util.function.Predicate;
import java.util.stream.Collectors;

import jdk.tools.jlink.internal.Platform;
import jdk.tools.jlink.plugin.Plugin;
import jdk.tools.jlink.plugin.ResourcePool;
import jdk.tools.jlink.plugin.ResourcePoolBuilder;
import jdk.tools.jlink.plugin.ResourcePoolModule;
import jdk.tools.jlink.plugin.ResourcePoolEntry;
import jdk.tools.jlink.plugin.PluginException;

/**
 *
 * Exclude VM plugin
 */
public final class ExcludeVMPlugin implements Plugin {

    private static final class JvmComparator implements Comparator<Jvm> {

        @Override
        public int compare(Jvm o1, Jvm o2) {
            return o1.getEfficience() - o2.getEfficience();
        }
    }

    private enum Jvm {
        // The efficience order server - client - minimal.
        SERVER("server", 3), CLIENT("client", 2), MINIMAL("minimal", 1);
        private final String name;
        private final int efficience;

        Jvm(String name, int efficience) {
            this.name = name;
            this.efficience = efficience;
        }

        private String getName() {
            return name;
        }

        private int getEfficience() {
            return efficience;
        }
    }

    private static final String JVM_CFG = "jvm.cfg";

    public static final String NAME = "vm";
    private static final String ALL = "all";
    private static final String CLIENT = "client";
    private static final String SERVER = "server";
    private static final String MINIMAL = "minimal";

    private Predicate<String> predicate;
    private Jvm target;
    private boolean keepAll;

    @Override
    public String getName() {
        return NAME;
    }

    /**
     * VM paths:
     * /java.base/lib/{architecture}/{server|client|minimal}/{shared lib}
     * e.g.: /java.base/lib/server/libjvm.so
     * /java.base/lib/server/libjvm.dylib
     */
    private List<ResourcePoolEntry> getVMs(ResourcePoolModule javaBase, String[] jvmlibs) {
        List<ResourcePoolEntry> ret = javaBase.entries().filter((t) -> {
            String path = t.path();
            for (String jvmlib : jvmlibs) {
                if (t.path().endsWith("/" + jvmlib)) {
                    return true;
                }
            }
            return false;
        }).collect(Collectors.toList());
        return ret;
    }

    @Override
    public ResourcePool transform(ResourcePool in, ResourcePoolBuilder out) {
        ResourcePoolModule javaBase = in.moduleView().findModule("java.base").get();
        String[] jvmlibs = jvmlibs(javaBase);
        TreeSet<Jvm> existing = new TreeSet<>(new JvmComparator());
        TreeSet<Jvm> removed = new TreeSet<>(new JvmComparator());
        if (!keepAll) {
            // First retrieve all available VM names and removed VM
            List<ResourcePoolEntry> jvms = getVMs(javaBase, jvmlibs);
            for (Jvm jvm : Jvm.values()) {
                for (ResourcePoolEntry md : jvms) {
                    String mdPath = md.path();
                    for (String jvmlib : jvmlibs) {
                        if (mdPath.endsWith("/" + jvm.getName() + "/" + jvmlib)) {
                            existing.add(jvm);
                            if (isRemoved(md)) {
                                removed.add(jvm);
                            }
                        }
                    }
                }
            }
        }
        // Check that target exists
        if (!keepAll) {
            if (!existing.contains(target)) {
                throw new PluginException("Selected VM " + target.getName() + " doesn't exist.");
            }
        }

        // Rewrite the jvm.cfg file.
        in.transformAndCopy((file) -> {
            if (!keepAll) {
                if (file.type().equals(ResourcePoolEntry.Type.NATIVE_LIB)) {
                    if (file.path().endsWith(JVM_CFG)) {
                        try {
                            file = handleJvmCfgFile(file, existing, removed);
                        } catch (IOException ex) {
                            throw new UncheckedIOException(ex);
                        }
                    }
                }
                file = isRemoved(file) ? null : file;
            }
            return file;
        }, out);

        return out.build();
    }

    private boolean isRemoved(ResourcePoolEntry file) {
        return !predicate.test(file.path());
    }

    @Override
    public Category getType() {
        return Category.FILTER;
    }

    @Override
    public String getDescription() {
        return PluginsResourceBundle.getDescription(NAME);
    }

    @Override
    public boolean hasArguments() {
        return true;
    }

    @Override
    public String getArgumentsDescription() {
       return PluginsResourceBundle.getArgument(NAME);
    }

    @Override
    public void configure(Map<String, String> config) {
        String value = config.get(NAME);
        String exclude = "";
        switch (value) {
            case ALL: {
                // no filter.
                keepAll = true;
                break;
            }
            case CLIENT: {
                target = Jvm.CLIENT;
                exclude = "/java.base/lib**server/**,/java.base/lib**minimal/**";
                break;
            }
            case SERVER: {
                target = Jvm.SERVER;
                exclude = "/java.base/lib**client/**,/java.base/lib**minimal/**";
                break;
            }
            case MINIMAL: {
                target = Jvm.MINIMAL;
                exclude = "/java.base/lib**server/**,/java.base/lib**client/**";
                break;
            }
            default: {
                throw new IllegalArgumentException("Unknown exclude VM option: " + value);
            }
        }
        predicate = ResourceFilter.excludeFilter(exclude);
    }

    private ResourcePoolEntry handleJvmCfgFile(ResourcePoolEntry orig,
            TreeSet<Jvm> existing,
            TreeSet<Jvm> removed) throws IOException {
        if (keepAll) {
            return orig;
        }
        StringBuilder builder = new StringBuilder();
        // Keep comments
        try (BufferedReader reader
                = new BufferedReader(new InputStreamReader(orig.content(),
                        StandardCharsets.UTF_8))) {
            reader.lines().forEach((s) -> {
                if (s.startsWith("#")) {
                    builder.append(s).append("\n");
                }
            });
        }
        TreeSet<Jvm> remaining = new TreeSet<>(new JvmComparator());
        // Add entry in jvm.cfg file from the more efficient to less efficient.
        for (Jvm platform : existing) {
            if (!removed.contains(platform)) {
                remaining.add(platform);
                builder.append("-").append(platform.getName()).append(" KNOWN\n");
            }
        }

        // removed JVM are aliased to the most efficient remaining JVM (last one).
        // The order in the file is from most to less efficient platform
        for (Jvm platform : removed.descendingSet()) {
            builder.append("-").append(platform.getName()).
                    append(" ALIASED_TO -").
                    append(remaining.last().getName()).append("\n");
        }

        byte[] content = builder.toString().getBytes(StandardCharsets.UTF_8);

        return orig.copyWithContent(content);
    }

    private static String[] jvmlibs(ResourcePoolModule module) {
        Platform platform = Platform.getTargetPlatform(module);
        switch (platform) {
            case WINDOWS:
                return new String[] { "jvm.dll" };
            case MACOS:
                return new String[] { "libjvm.dylib", "libjvm.a" };
            default:
                return new String[] { "libjvm.so", "libjvm.a" };
        }
    }
}

jdk/tools/jlink/internal/plugins/ExcludeVMPlugin.java

 

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