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	/*
	* Copyright (c) 1999, 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.*;

	import java.util.Map;
	import java.util.StringTokenizer;
	import java.util.List;
	import java.util.ArrayList;
	import java.io.IOException;
	import java.io.InterruptedIOException;

	abstract class AbstractLauncher extends ConnectorImpl implements LaunchingConnector {

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

	ThreadGroup grp;

	AbstractLauncher() {
	super();

	grp = Thread.currentThread().getThreadGroup();
	ThreadGroup parent = null;
	while ((parent = grp.getParent()) != null) {
	grp = parent;
	}
	}

	String[] tokenizeCommand(String command, char quote) {
	String quoteStr = String.valueOf(quote); // easier to deal with

	/*
	* Tokenize the command, respecting the given quote character.
	*/
	StringTokenizer tokenizer = new StringTokenizer(command,
	quote + " \t\r\n\f",
	true);
	String quoted = null;
	String pending = null;
	List<String> tokenList = new ArrayList<String>();
	while (tokenizer.hasMoreTokens()) {
	String token = tokenizer.nextToken();
	if (quoted != null) {
	if (token.equals(quoteStr)) {
	tokenList.add(quoted);
	quoted = null;
	} else {
	quoted += token;
	}
	} else if (pending != null) {
	if (token.equals(quoteStr)) {
	quoted = pending;
	} else if ((token.length() == 1) &&
	Character.isWhitespace(token.charAt(0))) {
	tokenList.add(pending);
	} else {
	throw new InternalException("Unexpected token: " + token);
	}
	pending = null;
	} else {
	if (token.equals(quoteStr)) {
	quoted = "";
	} else if ((token.length() == 1) &&
	Character.isWhitespace(token.charAt(0))) {
	// continue
	} else {
	pending = token;
	}
	}
	}

	/*
	* Add final token.
	*/
	if (pending != null) {
	tokenList.add(pending);
	}

	/*
	* An unclosed quote at the end of the command. Do an
	* implicit end quote.
	*/
	if (quoted != null) {
	tokenList.add(quoted);
	}

	String[] tokenArray = new String[tokenList.size()];
	for (int i = 0; i < tokenList.size(); i++) {
	tokenArray[i] = tokenList.get(i);
	}
	return tokenArray;
	}

	protected VirtualMachine launch(String[] commandArray, String address,
	TransportService.ListenKey listenKey,
	TransportService ts)
	throws IOException, VMStartException {
	Helper helper = new Helper(commandArray, address, listenKey, ts);
	helper.launchAndAccept();

	VirtualMachineManager manager =
	Bootstrap.virtualMachineManager();

	return manager.createVirtualMachine(helper.connection(),
	helper.process());
	}

	/**
	* This class simply provides a context for a single launch and
	* accept. It provides instance fields that can be used by
	* all threads involved. This stuff can't be in the Connector proper
	* because the connector is a singleton and is not specific to any
	* one launch.
	*/
	private class Helper {
	private final String address;
	private TransportService.ListenKey listenKey;
	private TransportService ts;
	private final String[] commandArray;
	private Process process = null;
	private Connection connection = null;
	private IOException acceptException = null;
	private boolean exited = false;

	Helper(String[] commandArray, String address, TransportService.ListenKey listenKey,
	TransportService ts) {
	this.commandArray = commandArray;
	this.address = address;
	this.listenKey = listenKey;
	this.ts = ts;
	}

	String commandString() {
	String str = "";
	for (int i = 0; i < commandArray.length; i++) {
	if (i > 0) {
	str += " ";
	}
	str += commandArray[i];
	}
	return str;
	}

	synchronized void launchAndAccept() throws
	IOException, VMStartException {

	process = Runtime.getRuntime().exec(commandArray);

	Thread acceptingThread = acceptConnection();
	Thread monitoringThread = monitorTarget();
	try {
	while ((connection == null) &&
	(acceptException == null) &&
	!exited) {
	wait();
	}

	if (exited) {
	throw new VMStartException(
	"VM initialization failed for: " + commandString(), process);
	}
	if (acceptException != null) {
	// Rethrow the exception in this thread
	throw acceptException;
	}
	} catch (InterruptedException e) {
	throw new InterruptedIOException("Interrupted during accept");
	} finally {
	acceptingThread.interrupt();
	monitoringThread.interrupt();
	}
	}

	Process process() {
	return process;
	}

	Connection connection() {
	return connection;
	}

	synchronized void notifyOfExit() {
	exited = true;
	notify();
	}

	synchronized void notifyOfConnection(Connection connection) {
	this.connection = connection;
	notify();
	}

	synchronized void notifyOfAcceptException(IOException acceptException) {
	this.acceptException = acceptException;
	notify();
	}

	Thread monitorTarget() {
	Thread thread = new Thread(grp,
	"launched target monitor") {
	public void run() {
	try {
	process.waitFor();
	/*
	* Notify waiting thread of VM error termination
	*/
	notifyOfExit();
	} catch (InterruptedException e) {
	// Connection has been established, stop monitoring
	}
	}
	};
	thread.setDaemon(true);
	thread.start();
	return thread;
	}

	Thread acceptConnection() {
	Thread thread = new Thread(grp,
	"connection acceptor") {
	public void run() {
	try {
	Connection connection = ts.accept(listenKey, 0, 0);
	/*
	* Notify waiting thread of connection
	*/
	notifyOfConnection(connection);
	} catch (InterruptedIOException e) {
	// VM terminated, stop accepting
	} catch (IOException e) {
	// Report any other exception to waiting thread
	notifyOfAcceptException(e);
	}
	}
	};
	thread.setDaemon(true);
	thread.start();
	return thread;
	}
	}
	}

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