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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.netbeans.lib.profiler.jps;

import org.netbeans.lib.profiler.utils.MiscUtils;
import java.lang.management.ManagementFactory;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import sun.jvmstat.monitor.HostIdentifier;
import sun.jvmstat.monitor.MonitorException;
import sun.jvmstat.monitor.MonitoredHost;
import sun.jvmstat.monitor.MonitoredVm;
import sun.jvmstat.monitor.MonitoredVmUtil;
import sun.jvmstat.monitor.VmIdentifier;


/**
 * This class is based on "jvmps" class from jvmps 2.0 written by Brian Doherty.
 * It provides functionality to identify all the JVMs currently running on the local machine.
 * Comments starting with //// are original comments from Brian.
 *
 * @author Tomas Hurka
 * @author Misha Dmitriev
 */
public class JpsProxy {
 
    //~ Methods ------------------------------------------------------------------------------------------------------------------

    /** Returns the array of records for all running VMs capable of dynamic attach (JDK 1.6 and newer)*/
    public static RunningVM[] getRunningVMs() {
        String hostname = null;
        List vret = new ArrayList();

        try {
            HostIdentifier hostId = new HostIdentifier(hostname);
            MonitoredHost monitoredHost = MonitoredHost.getMonitoredHost(hostId);
            String selfName = ManagementFactory.getRuntimeMXBean().getName();

            //// get the list active VMs on the specified host.
            Set jvms = monitoredHost.activeVms();

            if (jvms.isEmpty()) {
                return null;
            }

            for (Iterator j = jvms.iterator(); j.hasNext();) {
                int lvmid = ((Integer) j.next()).intValue();

                if (selfName.startsWith(lvmid + "@")) { // myself

                    continue;
                }

                VmIdentifier id = null;
                MonitoredVm vm = null;
                String uriString = "//" + lvmid + "?mode=r"; // NOI18N

                try {
                    id = new VmIdentifier(uriString);
                    vm = monitoredHost.getMonitoredVm(id, 0);
                } catch (URISyntaxException e) {
                    //// this error should not occur as we are creating our own VMIdentifiers above based on a validated HostIdentifier.
                    //// This would be an unexpected condition.
                    MiscUtils.printWarningMessage("in jvmps, detected malformed VM Identifier: " + uriString + "; ignored"); // NOI18N

                    continue;
                } catch (MonitorException e) {
                    System.out.println("Ex " + e.getMessage());
                    e.printStackTrace();

                    //// it's possible that from the time we acquired the list of available jvms that a jvm has terminated. Therefore, it is
                    //// best just to ignore this error.
                    continue;
                } catch (Exception e) {
                    //// certain types of errors, such as access acceptions, can be encountered when attaching to a jvm.
                    //// These are reported as exceptions, not as some subclass of security exception.

                    //// FIXME - we should probably have some provision for logging these types of errors, or possibly just print out the
                    //// the Java Virtual Machine lvmid in a finally clause: System.out.println(String.valueOf(lvmid));
                    MiscUtils.printWarningMessage("in jvmps, for VM = " + String.valueOf(lvmid) + " got exception: " + e); // NOI18N

                    continue;
                }

                if (!isAttachable(vm)) {
                    monitoredHost.detach(vm);

                    continue;
                }

                String cmdString = MonitoredVmUtil.commandLine(vm);
                String mainClass = MonitoredVmUtil.mainClass(vm, true);
                String mainArgs = MonitoredVmUtil.mainArgs(vm);
                String vmArgs = MonitoredVmUtil.jvmArgs(vm);
                String vmFlags = MonitoredVmUtil.jvmFlags(vm);

                monitoredHost.detach(vm);

                RunningVM rvm = new RunningVM(lvmid, vmFlags, vmArgs, mainClass, mainArgs);
                vret.add(rvm);
            }
        } catch (MonitorException e) {
            String report = "in jvmps, got MonitorException"; // NOI18N

            if (e.getMessage() != null) {
                report += (" with message + " + e.getMessage()); // NOI18N
            }

            MiscUtils.printWarningMessage(report);

            return null;
        } catch (URISyntaxException e) {
            MiscUtils.printWarningMessage("in jvmps, got malformed Host Identifier: " + hostname); // NOI18N

            return null;
        }

        return (RunningVM[]) vret.toArray(new RunningVM[0]);
    }

    private static boolean isAttachable(MonitoredVm vm) {
        try {
            return MonitoredVmUtil.isAttachable(vm);
        } catch (MonitorException ex) {
            ex.printStackTrace();
            return false;
        }
    }
}