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Java example source code file (multivm.java)

This example Java source code file (multivm.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

attachingconnector, illegalconnectorargumentsexception, ioexception, iterator, jdi, list, map, numberformatexception, string, util, virtualmachine, virtualmachinemanager

The multivm.java Java example source code

/*
 * Copyright (c) 2003, 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.
 *
 */

import com.sun.jdi.*;
import com.sun.jdi.connect.*;

import java.util.Map;
import java.util.List;
import java.util.Iterator;
import java.io.IOException;

/* This class is used to test multi VM connectivity feature of
 * SA/JDI. Accepts two PIDs as arguments. Connects to first VM
 *, Connects to second VM and disposes them in that order.
 */

public class multivm {
    static AttachingConnector myPIDConn;
    static VirtualMachine vm1;
    static VirtualMachine vm2;
    static VirtualMachineManager vmmgr;

    public static void println(String msg) {
        System.out.println(msg);
    }

    private static void usage() {
        System.err.println("Usage: java multivm <pid1> ");
        System.exit(1);
    }

    public static void main(String args[]) {
        vmmgr = Bootstrap.virtualMachineManager();
        List attachingConnectors = vmmgr.attachingConnectors();
        if (attachingConnectors.isEmpty()) {
            System.err.println( "ERROR: No attaching connectors");
            return;
        }
        Iterator myIt = attachingConnectors.iterator();
        while (myIt.hasNext()) {
            AttachingConnector tmpCon = (AttachingConnector)myIt.next();
            if (tmpCon.name().equals(
                "sun.jvm.hotspot.jdi.SAPIDAttachingConnector")) {
                myPIDConn = tmpCon;
                break;
            }
        }

        int pid1 = 0, pid2 = 0;
        String pidText = null;
        switch (args.length) {
        case (2):
            try {
                pidText = args[0];
                pid1 = Integer.parseInt(pidText);
                System.out.println( "pid1: " + pid1);
                vm1 = attachPID(pid1);
                pidText = args[1];
                pid2 = Integer.parseInt(pidText);
                System.out.println( "pid2: " + pid2);
                vm2 = attachPID(pid2);
            } catch (NumberFormatException e) {
                println(e.getMessage());
                usage();
            }
            break;
        default:
            usage();
        }

        if (vm1 != null) {
            System.out.println("vm1: attached ok!");
            System.out.println(vm1.version());
            sagdoit mine = new sagdoit(vm1);
            mine.doAll();
        }

        if (vm2 != null) {
            System.out.println("vm2: attached ok!");
            System.out.println(vm2.version());
            sagdoit mine = new sagdoit(vm2);
            mine.doAll();
        }

        if (vm1 != null) {
            vm1.dispose();
        }

        if (vm2 != null) {
            vm2.dispose();
        }
    }

   private static VirtualMachine attachPID(int pid) {
        Map connArgs = myPIDConn.defaultArguments();
        System.out.println("connArgs = " + connArgs);
        VirtualMachine vm;
        Connector.StringArgument connArg = (Connector.StringArgument)connArgs.get("pid");
        connArg.setValue(Integer.toString(pid));

        try {
            vm = myPIDConn.attach(connArgs);
        } catch (IOException ee) {
            System.err.println("ERROR: myPIDConn.attach got IO Exception:" + ee);
            vm = null;
        } catch (IllegalConnectorArgumentsException ee) {
            System.err.println("ERROR: myPIDConn.attach got illegal args exception:" + ee);
            vm = null;
        }
        return vm;
   }
}

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