Java example source code file (SunCommandLineLauncher.java)

This example Java source code file (SunCommandLineLauncher.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arg_home, arg_init_suspend, arg_main, arg_options, arg_quote, arg_vm_exec, illegalconnectorargumentsexception, ioexception, jdi, random, string, suncommandlinelauncher, transport, transportservice, util, virtualmachine

The SunCommandLineLauncher.java Java example source code

/*
 * Copyright (c) 1998, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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.
 */

package com.sun.tools.jdi;

import com.sun.tools.jdi.*;
import com.sun.jdi.connect.*;
import com.sun.jdi.connect.spi.*;
import com.sun.jdi.VirtualMachine;
import java.util.Map;
import java.util.HashMap;
import java.util.Random;
import java.io.IOException;
import java.io.File;

public class SunCommandLineLauncher extends AbstractLauncher implements LaunchingConnector {

    static private final String ARG_HOME = "home";
    static private final String ARG_OPTIONS = "options";
    static private final String ARG_MAIN = "main";
    static private final String ARG_INIT_SUSPEND = "suspend";
    static private final String ARG_QUOTE = "quote";
    static private final String ARG_VM_EXEC = "vmexec";

    TransportService transportService;
    Transport transport;
    boolean usingSharedMemory = false;

    TransportService transportService() {
        return transportService;
    }

    public Transport transport() {
        return transport;
    }

    public SunCommandLineLauncher() {
        super();

        /**
         * By default this connector uses either the shared memory
         * transport or the socket transport
         */
        try {
            Class<?> c = Class.forName("com.sun.tools.jdi.SharedMemoryTransportService");
            transportService = (TransportService)c.newInstance();
            transport = new Transport() {
                public String name() {
                    return "dt_shmem";
                }
            };
            usingSharedMemory = true;
        } catch (ClassNotFoundException x) {
        } catch (UnsatisfiedLinkError x) {
        } catch (InstantiationException x) {
        } catch (IllegalAccessException x) {
        };
        if (transportService == null) {
            transportService = new SocketTransportService();
            transport = new Transport() {
                public String name() {
                    return "dt_socket";
                }
            };
        }

        addStringArgument(
                ARG_HOME,
                getString("sun.home.label"),
                getString("sun.home"),
                System.getProperty("java.home"),
                false);
        addStringArgument(
                ARG_OPTIONS,
                getString("sun.options.label"),
                getString("sun.options"),
                "",
                false);
        addStringArgument(
                ARG_MAIN,
                getString("sun.main.label"),
                getString("sun.main"),
                "",
                true);

        addBooleanArgument(
                ARG_INIT_SUSPEND,
                getString("sun.init_suspend.label"),
                getString("sun.init_suspend"),
                true,
                false);

        addStringArgument(
                ARG_QUOTE,
                getString("sun.quote.label"),
                getString("sun.quote"),
                "\"",
                true);
        addStringArgument(
                ARG_VM_EXEC,
                getString("sun.vm_exec.label"),
                getString("sun.vm_exec"),
                "java",
                true);
    }

    static boolean hasWhitespace(String string) {
        int length = string.length();
        for (int i = 0; i < length; i++) {
            if (Character.isWhitespace(string.charAt(i))) {
                return true;
            }
        }
        return false;
    }

    public VirtualMachine
        launch(Map<String,? extends Connector.Argument> arguments)
        throws IOException, IllegalConnectorArgumentsException,
               VMStartException
    {
        VirtualMachine vm;

        String home = argument(ARG_HOME, arguments).value();
        String options = argument(ARG_OPTIONS, arguments).value();
        String mainClassAndArgs = argument(ARG_MAIN, arguments).value();
        boolean wait = ((BooleanArgumentImpl)argument(ARG_INIT_SUSPEND,
                                                  arguments)).booleanValue();
        String quote = argument(ARG_QUOTE, arguments).value();
        String exe = argument(ARG_VM_EXEC, arguments).value();
        String exePath = null;

        if (quote.length() > 1) {
            throw new IllegalConnectorArgumentsException("Invalid length",
                                                         ARG_QUOTE);
        }

        if ((options.indexOf("-Djava.compiler=") != -1) &&
            (options.toLowerCase().indexOf("-djava.compiler=none") == -1)) {
            throw new IllegalConnectorArgumentsException("Cannot debug with a JIT compiler",
                                                         ARG_OPTIONS);
        }

        /*
         * Start listening.
         * If we're using the shared memory transport then we pick a
         * random address rather than using the (fixed) default.
         * Random() uses System.currentTimeMillis() as the seed
         * which can be a problem on windows (many calls to
         * currentTimeMillis can return the same value), so
         * we do a few retries if we get an IOException (we
         * assume the IOException is the filename is already in use.)
         */
        TransportService.ListenKey listenKey;
        if (usingSharedMemory) {
            Random rr = new Random();
            int failCount = 0;
            while(true) {
                try {
                    String address = "javadebug" +
                        String.valueOf(rr.nextInt(100000));
                    listenKey = transportService().startListening(address);
                    break;
                } catch (IOException ioe) {
                    if (++failCount > 5) {
                        throw ioe;
                    }
                }
            }
        } else {
            listenKey = transportService().startListening();
        }
        String address = listenKey.address();

        try {
            if (home.length() > 0) {
                exePath = home + File.separator + "bin" + File.separator + exe;
            } else {
                exePath = exe;
            }
            // Quote only if necessary in case the quote arg value is bogus
            if (hasWhitespace(exePath)) {
                exePath = quote + exePath + quote;
            }

            String xrun = "transport=" + transport().name() +
                          ",address=" + address +
                          ",suspend=" + (wait? 'y' : 'n');
            // Quote only if necessary in case the quote arg value is bogus
            if (hasWhitespace(xrun)) {
                xrun = quote + xrun + quote;
            }

            String command = exePath + ' ' +
                             options + ' ' +
                             "-Xdebug " +
                             "-Xrunjdwp:" + xrun + ' ' +
                             mainClassAndArgs;

            // System.err.println("Command: \"" + command + '"');
            vm = launch(tokenizeCommand(command, quote.charAt(0)), address, listenKey,
                        transportService());
        } finally {
            transportService().stopListening(listenKey);
        }

        return vm;
    }

    public String name() {
        return "com.sun.jdi.CommandLineLaunch";
    }

    public String description() {
        return getString("sun.description");

    }
}