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	/*
	* Copyright (c) 1998, 2008, 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.jdi.*;
	import com.sun.jdi.connect.*;
	import com.sun.jdi.connect.spi.*;
	import java.lang.reflect.Constructor;
	import java.lang.reflect.InvocationTargetException;
	import java.util.List;
	import java.util.ArrayList;
	import java.util.Collections;
	import java.util.Iterator;
	import java.util.ResourceBundle;
	import java.io.IOException;

	import java.util.ServiceLoader;

	/* Public for use by com.sun.jdi.Bootstrap */
	public class VirtualMachineManagerImpl implements VirtualMachineManagerService {
	private List<Connector> connectors = new ArrayList<Connector>();
	private LaunchingConnector defaultConnector = null;
	private List<VirtualMachine> targets = new ArrayList<VirtualMachine>();
	private final ThreadGroup mainGroupForJDI;
	private ResourceBundle messages = null;
	private int vmSequenceNumber = 0;
	private static final int majorVersion = 1;
	private static final int minorVersion = 8;

	private static final Object lock = new Object();
	private static VirtualMachineManagerImpl vmm;

	public static VirtualMachineManager virtualMachineManager() {
	SecurityManager sm = System.getSecurityManager();
	if (sm != null) {
	JDIPermission vmmPermission =
	new JDIPermission("virtualMachineManager");
	sm.checkPermission(vmmPermission);
	}
	synchronized (lock) {
	if (vmm == null) {
	vmm = new VirtualMachineManagerImpl();
	}
	}
	return vmm;
	}

	protected VirtualMachineManagerImpl() {

	/*
	* Create a top-level thread group
	*/
	ThreadGroup top = Thread.currentThread().getThreadGroup();
	ThreadGroup parent = null;
	while ((parent = top.getParent()) != null) {
	top = parent;
	}
	mainGroupForJDI = new ThreadGroup(top, "JDI main");

	/*
	* Load the connectors
	*/
	ServiceLoader<Connector> connectorLoader =
	ServiceLoader.load(Connector.class, Connector.class.getClassLoader());

	Iterator<Connector> connectors = connectorLoader.iterator();

	while (connectors.hasNext()) {
	Connector connector;

	try {
	connector = connectors.next();
	} catch (ThreadDeath x) {
	throw x;
	} catch (Exception x) {
	System.err.println(x);
	continue;
	} catch (Error x) {
	System.err.println(x);
	continue;
	}

	addConnector(connector);
	}

	/*
	* Load any transport services and encapsulate them with
	* an attaching and listening connector.
	*/
	ServiceLoader<TransportService> transportLoader =
	ServiceLoader.load(TransportService.class,
	TransportService.class.getClassLoader());

	Iterator<TransportService> transportServices =
	transportLoader.iterator();

	while (transportServices.hasNext()) {
	TransportService transportService;

	try {
	transportService = transportServices.next();
	} catch (ThreadDeath x) {
	throw x;
	} catch (Exception x) {
	System.err.println(x);
	continue;
	} catch (Error x) {
	System.err.println(x);
	continue;
	}

	addConnector(GenericAttachingConnector.create(transportService));
	addConnector(GenericListeningConnector.create(transportService));
	}

	// no connectors found
	if (allConnectors().size() == 0) {
	throw new Error("no Connectors loaded");
	}

	// Set the default launcher. In order to be compatible
	// 1.2/1.3/1.4 we try to make the default launcher
	// "com.sun.jdi.CommandLineLaunch". If this connector
	// isn't found then we arbitarly pick the first connector.
	//
	boolean found = false;
	List<LaunchingConnector> launchers = launchingConnectors();
	for (LaunchingConnector lc: launchers) {
	if (lc.name().equals("com.sun.jdi.CommandLineLaunch")) {
	setDefaultConnector(lc);
	found = true;
	break;
	}
	}
	if (!found && launchers.size() > 0) {
	setDefaultConnector(launchers.get(0));
	}

	}

	public LaunchingConnector defaultConnector() {
	if (defaultConnector == null) {
	throw new Error("no default LaunchingConnector");
	}
	return defaultConnector;
	}

	public void setDefaultConnector(LaunchingConnector connector) {
	defaultConnector = connector;
	}

	public List<LaunchingConnector> launchingConnectors() {
	List<LaunchingConnector> launchingConnectors = new ArrayList<LaunchingConnector>(connectors.size());
	for (Connector connector: connectors) {
	if (connector instanceof LaunchingConnector) {
	launchingConnectors.add((LaunchingConnector)connector);
	}
	}
	return Collections.unmodifiableList(launchingConnectors);
	}

	public List<AttachingConnector> attachingConnectors() {
	List<AttachingConnector> attachingConnectors = new ArrayList<AttachingConnector>(connectors.size());
	for (Connector connector: connectors) {
	if (connector instanceof AttachingConnector) {
	attachingConnectors.add((AttachingConnector)connector);
	}
	}
	return Collections.unmodifiableList(attachingConnectors);
	}

	public List<ListeningConnector> listeningConnectors() {
	List<ListeningConnector> listeningConnectors = new ArrayList<ListeningConnector>(connectors.size());
	for (Connector connector: connectors) {
	if (connector instanceof ListeningConnector) {
	listeningConnectors.add((ListeningConnector)connector);
	}
	}
	return Collections.unmodifiableList(listeningConnectors);
	}

	public List<Connector> allConnectors() {
	return Collections.unmodifiableList(connectors);
	}

	public List<VirtualMachine> connectedVirtualMachines() {
	return Collections.unmodifiableList(targets);
	}

	public void addConnector(Connector connector) {
	connectors.add(connector);
	}

	public void removeConnector(Connector connector) {
	connectors.remove(connector);
	}

	public synchronized VirtualMachine createVirtualMachine(
	Connection connection,
	Process process) throws IOException {

	if (!connection.isOpen()) {
	throw new IllegalStateException("connection is not open");
	}

	VirtualMachine vm;
	try {
	vm = new VirtualMachineImpl(this, connection, process,
	++vmSequenceNumber);
	} catch (VMDisconnectedException e) {
	throw new IOException(e.getMessage());
	}
	targets.add(vm);
	return vm;
	}

	public VirtualMachine createVirtualMachine(Connection connection) throws IOException {
	return createVirtualMachine(connection, null);
	}

	public void addVirtualMachine(VirtualMachine vm) {
	targets.add(vm);
	}

	void disposeVirtualMachine(VirtualMachine vm) {
	targets.remove(vm);
	}

	public int majorInterfaceVersion() {
	return majorVersion;
	}

	public int minorInterfaceVersion() {
	return minorVersion;
	}

	ThreadGroup mainGroupForJDI() {
	return mainGroupForJDI;
	}

	String getString(String key) {
	if (messages == null) {
	messages = ResourceBundle.getBundle("com.sun.tools.jdi.resources.jdi");
	}
	return messages.getString(key);
	}

	}

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