JDK 11 jdk.jshell.jmod - JShell Tool

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

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

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

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

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

✍: FYIcenter

jdk/jshell/execution/DefaultLoaderDelegate.java

/*
 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */
package jdk.jshell.execution;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLConnection;
import java.net.URLStreamHandler;
import java.security.CodeSource;
import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import jdk.jshell.spi.ExecutionControl.ClassBytecodes;
import jdk.jshell.spi.ExecutionControl.ClassInstallException;
import jdk.jshell.spi.ExecutionControl.EngineTerminationException;
import jdk.jshell.spi.ExecutionControl.InternalException;

/**
 * The standard implementation of {@link LoaderDelegate} using
 * a {@link URLClassLoader}.
 *
 * @author Robert Field
 */
class DefaultLoaderDelegate implements LoaderDelegate {

    private final RemoteClassLoader loader;
    private final Map<String, Class<?>> klasses = new HashMap<>();

    private static class RemoteClassLoader extends URLClassLoader {

        private final Map<String, ClassFile> classFiles = new HashMap<>();

        RemoteClassLoader() {
            super(new URL[0]);
        }

        private class ResourceURLStreamHandler extends URLStreamHandler {

            private final String name;

            ResourceURLStreamHandler(String name) {
                this.name = name;
            }

            @Override
            protected URLConnection openConnection(URL u) throws IOException {
                return new URLConnection(u) {
                    private InputStream in;
                    private Map<String, List<String>> fields;
                    private List<String> fieldNames;

                    @Override
                    public void connect() {
                        if (connected) {
                            return;
                        }
                        connected = true;
                        ClassFile file = classFiles.get(name);
                        in = new ByteArrayInputStream(file.data);
                        fields = new LinkedHashMap<>();
                        fields.put("content-length", List.of(Integer.toString(file.data.length)));
                        Instant instant = new Date(file.timestamp).toInstant();
                        ZonedDateTime time = ZonedDateTime.ofInstant(instant, ZoneId.of("GMT"));
                        String timeStamp = DateTimeFormatter.RFC_1123_DATE_TIME.format(time);
                        fields.put("date", List.of(timeStamp));
                        fields.put("last-modified", List.of(timeStamp));
                        fieldNames = new ArrayList<>(fields.keySet());
                    }

                    @Override
                    public InputStream getInputStream() throws IOException {
                        connect();
                        return in;
                    }

                    @Override
                    public String getHeaderField(String name) {
                        connect();
                        return fields.getOrDefault(name, List.of())
                                     .stream()
                                     .findFirst()
                                     .orElse(null);
                    }

                    @Override
                    public Map<String, List<String>> getHeaderFields() {
                        connect();
                        return fields;
                    }

                    @Override
                    public String getHeaderFieldKey(int n) {
                        return n < fieldNames.size() ? fieldNames.get(n) : null;
                    }

                    @Override
                    public String getHeaderField(int n) {
                        String name = getHeaderFieldKey(n);

                        return name != null ? getHeaderField(name) : null;
                    }

                };
            }
        }

        void declare(String name, byte[] bytes) {
            classFiles.put(toResourceString(name), new ClassFile(bytes, System.currentTimeMillis()));
        }

        @Override
        protected Class<?> findClass(String name) throws ClassNotFoundException {
            ClassFile file = classFiles.get(toResourceString(name));
            if (file == null) {
                return super.findClass(name);
            }
            return super.defineClass(name, file.data, 0, file.data.length, (CodeSource) null);
        }

        @Override
        public URL findResource(String name) {
            URL u = doFindResource(name);
            return u != null ? u : super.findResource(name);
        }

        @Override
        public Enumeration<URL> findResources(String name) throws IOException {
            URL u = doFindResource(name);
            Enumeration<URL> sup = super.findResources(name);

            if (u == null) {
                return sup;
            }

            List<URL> result = new ArrayList<>();

            while (sup.hasMoreElements()) {
                result.add(sup.nextElement());
            }

            result.add(u);

            return Collections.enumeration(result);
        }

        private URL doFindResource(String name) {
            if (classFiles.containsKey(name)) {
                try {
                    return new URL(null,
                                   new URI("jshell", null, "/" + name, null).toString(),
                                   new ResourceURLStreamHandler(name));
                } catch (MalformedURLException | URISyntaxException ex) {
                    throw new InternalError(ex);
                }
            }

            return null;
        }

        private String toResourceString(String className) {
            return className.replace('.', '/') + ".class";
        }

        @Override
        public void addURL(URL url) {
            super.addURL(url);
        }

        private static class ClassFile {
            public final byte[] data;
            public final long timestamp;

            ClassFile(byte[] data, long timestamp) {
                this.data = data;
                this.timestamp = timestamp;
            }

        }
    }

    public DefaultLoaderDelegate() {
        this.loader = new RemoteClassLoader();
        Thread.currentThread().setContextClassLoader(loader);
    }

    @Override
    public void load(ClassBytecodes[] cbcs)
            throws ClassInstallException, EngineTerminationException {
        boolean[] loaded = new boolean[cbcs.length];
        try {
            for (ClassBytecodes cbc : cbcs) {
                loader.declare(cbc.name(), cbc.bytecodes());
            }
            for (int i = 0; i < cbcs.length; ++i) {
                ClassBytecodes cbc = cbcs[i];
                Class<?> klass = loader.loadClass(cbc.name());
                klasses.put(cbc.name(), klass);
                loaded[i] = true;
                // Get class loaded to the point of, at least, preparation
                klass.getDeclaredMethods();
            }
        } catch (Throwable ex) {
            throw new ClassInstallException("load: " + ex.getMessage(), loaded);
        }
    }

    @Override
    public void classesRedefined(ClassBytecodes[] cbcs) {
        for (ClassBytecodes cbc : cbcs) {
            loader.declare(cbc.name(), cbc.bytecodes());
        }
    }

    @Override
    public void addToClasspath(String cp)
            throws EngineTerminationException, InternalException {
        try {
            for (String path : cp.split(File.pathSeparator)) {
                loader.addURL(new File(path).toURI().toURL());
            }
        } catch (Exception ex) {
            throw new InternalException(ex.toString());
        }
    }

    @Override
    public Class<?> findClass(String name) throws ClassNotFoundException {
        Class<?> klass = klasses.get(name);
        if (klass == null) {
            throw new ClassNotFoundException(name + " not found");
        } else {
            return klass;
        }
    }

}

jdk/jshell/execution/DefaultLoaderDelegate.java

 

JDK 11 jdk.jsobject.jmod - JS Object Module

JDK 11 jdk.jlink.jmod - JLink Tool

Download and Use JDK 11

⇑⇑ FAQ for JDK (Java Development Kit)

2018-11-10, 3833👍, 0💬