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	/*
	* Copyright (c) 2004, 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 sun.tools.jps;

	import java.util.*;
	import java.net.*;
	import sun.jvmstat.monitor.*;

	/**
	* Application to provide a listing of monitorable java processes.
	*
	* @author Brian Doherty
	* @since 1.5
	*/
	public class Jps {

	private static Arguments arguments;

	public static void main(String[] args) {
	try {
	arguments = new Arguments(args);
	} catch (IllegalArgumentException e) {
	System.err.println(e.getMessage());
	Arguments.printUsage(System.err);
	System.exit(1);
	}

	if (arguments.isHelp()) {
	Arguments.printUsage(System.err);
	System.exit(0);
	}

	try {
	HostIdentifier hostId = arguments.hostId();
	MonitoredHost monitoredHost =
	MonitoredHost.getMonitoredHost(hostId);

	// get the set active JVMs on the specified host.
	Set<Integer> jvms = monitoredHost.activeVms();

	for (Integer jvm: jvms) {
	StringBuilder output = new StringBuilder();
	Throwable lastError = null;

	int lvmid = jvm;

	output.append(String.valueOf(lvmid));

	if (arguments.isQuiet()) {
	System.out.println(output);
	continue;
	}

	MonitoredVm vm = null;
	String vmidString = "//" + lvmid + "?mode=r";

	String errorString = null;

	try {
	// Note: The VM associated with the current VM id may
	// no longer be running so these queries may fail. We
	// already added the VM id to the output stream above.
	// If one of the queries fails, then we try to add a
	// reasonable message to indicate that the requested
	// info is not available.

	errorString = " -- process information unavailable";
	VmIdentifier id = new VmIdentifier(vmidString);
	vm = monitoredHost.getMonitoredVm(id, 0);

	errorString = " -- main class information unavailable";
	output.append(" " + MonitoredVmUtil.mainClass(vm,
	arguments.showLongPaths()));

	if (arguments.showMainArgs()) {
	errorString = " -- main args information unavailable";
	String mainArgs = MonitoredVmUtil.mainArgs(vm);
	if (mainArgs != null && mainArgs.length() > 0) {
	output.append(" " + mainArgs);
	}
	}
	if (arguments.showVmArgs()) {
	errorString = " -- jvm args information unavailable";
	String jvmArgs = MonitoredVmUtil.jvmArgs(vm);
	if (jvmArgs != null && jvmArgs.length() > 0) {
	output.append(" " + jvmArgs);
	}
	}
	if (arguments.showVmFlags()) {
	errorString = " -- jvm flags information unavailable";
	String jvmFlags = MonitoredVmUtil.jvmFlags(vm);
	if (jvmFlags != null && jvmFlags.length() > 0) {
	output.append(" " + jvmFlags);
	}
	}

	errorString = " -- detach failed";
	monitoredHost.detach(vm);

	System.out.println(output);

	errorString = null;
	} catch (URISyntaxException e) {
	// unexpected as vmidString is based on a validated hostid
	lastError = e;
	assert false;
	} catch (Exception e) {
	lastError = e;
	} finally {
	if (errorString != null) {
	/*
	* we ignore most exceptions, as there are race
	* conditions where a JVM in 'jvms' may terminate
	* before we get a chance to list its information.
	* Other errors, such as access and I/O exceptions
	* should stop us from iterating over the complete set.
	*/
	output.append(errorString);
	if (arguments.isDebug()) {
	if ((lastError != null)
	&& (lastError.getMessage() != null)) {
	output.append("\n\t");
	output.append(lastError.getMessage());
	}
	}
	System.out.println(output);
	if (arguments.printStackTrace()) {
	lastError.printStackTrace();
	}
	continue;
	}
	}
	}
	} catch (MonitorException e) {
	if (e.getMessage() != null) {
	System.err.println(e.getMessage());
	} else {
	Throwable cause = e.getCause();
	if ((cause != null) && (cause.getMessage() != null)) {
	System.err.println(cause.getMessage());
	} else {
	e.printStackTrace();
	}
	}
	System.exit(1);
	}
	}
	}

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