https://openjdk.java.net/ 
/*
 * Copyright (c) 2002, 2017, 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 javax.management.remote.rmi;


import com.sun.jmx.remote.security.MBeanServerFileAccessController;
import com.sun.jmx.remote.util.ClassLogger;
import com.sun.jmx.remote.util.EnvHelp;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputFilter;
import java.io.ObjectOutputStream;
import java.net.MalformedURLException;
import java.rmi.server.RMIClientSocketFactory;
import java.rmi.server.RMIServerSocketFactory;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Map;
import java.util.Set;

import javax.management.InstanceNotFoundException;
import javax.management.MBeanServer;
import javax.management.remote.JMXAuthenticator;

import javax.management.remote.JMXConnectionNotification;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorServer;
import javax.management.remote.JMXServiceURL;
import javax.management.remote.MBeanServerForwarder;

import javax.naming.InitialContext;
import javax.naming.NamingException;


A JMX API connector server that creates RMI-based connections from remote clients. Usually, such connector servers are made using 
JMXConnectorServerFactory. However, specialized applications can use this class directly, for example with an RMIServerImpl object.


Since:1.5
/**
 * <p>A JMX API connector server that creates RMI-based connections
 * from remote clients.  Usually, such connector servers are made
 * using {@link javax.management.remote.JMXConnectorServerFactory
 * JMXConnectorServerFactory}.  However, specialized applications can
 * use this class directly, for example with an {@link RMIServerImpl}
 * object.</p>
 *
 * @since 1.5
 */
public class RMIConnectorServer extends JMXConnectorServer {
    
Name of the attribute that specifies whether the RMIServer stub that represents an RMI connector server should override an existing stub at the same address. The value associated with this attribute, if any, should be a string that is equal, ignoring case, to "true" or
"false".  The default value is false.


/**
     * <p>Name of the attribute that specifies whether the {@link
     * RMIServer} stub that represents an RMI connector server should
     * override an existing stub at the same address.  The value
     * associated with this attribute, if any, should be a string that
     * is equal, ignoring case, to <code>"true"</code> or
     * <code>"false"</code>.  The default value is false.</p>
     */
    public static final String JNDI_REBIND_ATTRIBUTE =
        "jmx.remote.jndi.rebind";

    
Name of the attribute that specifies the RMIClientSocketFactory for the RMI objects created in conjunction with this connector. The value associated with this attribute must be of type RMIClientSocketFactory and can
only be specified in the Map argument supplied when
creating a connector server.


/**
     * <p>Name of the attribute that specifies the {@link
     * RMIClientSocketFactory} for the RMI objects created in
     * conjunction with this connector. The value associated with this
     * attribute must be of type <code>RMIClientSocketFactory</code> and can
     * only be specified in the <code>Map</code> argument supplied when
     * creating a connector server.</p>
     */
    public static final String RMI_CLIENT_SOCKET_FACTORY_ATTRIBUTE =
        "jmx.remote.rmi.client.socket.factory";

    
Name of the attribute that specifies the RMIServerSocketFactory for the RMI objects created in conjunction with this connector. The value associated with this attribute must be of type RMIServerSocketFactory and can
only be specified in the Map argument supplied when
creating a connector server.


/**
     * <p>Name of the attribute that specifies the {@link
     * RMIServerSocketFactory} for the RMI objects created in
     * conjunction with this connector. The value associated with this
     * attribute must be of type <code>RMIServerSocketFactory</code> and can
     * only be specified in the <code>Map</code> argument supplied when
     * creating a connector server.</p>
     */
    public static final String RMI_SERVER_SOCKET_FACTORY_ATTRIBUTE =
        "jmx.remote.rmi.server.socket.factory";

    
Name of the attribute that specifies a list of class names acceptable as parameters to the RMIServer.newClient() remote method call. 
 This list of classes should correspond to the transitive closure of the credentials class (or classes) used by the installed JMXAuthenticator associated with the RMIServer implementation. 

If the attribute is not set, or is null, then any class is
deemed acceptable.

Deprecated:Use CREDENTIALS_FILTER_PATTERN with a 
filter pattern string instead.
/**
     * Name of the attribute that specifies a list of class names acceptable
     * as parameters to the {@link RMIServer#newClient(java.lang.Object) RMIServer.newClient()}
     * remote method call.
     * <p>
     * This list of classes should correspond to the transitive closure of the
     * credentials class (or classes) used by the installed {@linkplain JMXAuthenticator}
     * associated with the {@linkplain RMIServer} implementation.
     * <p>
     * If the attribute is not set, or is null, then any class is
     * deemed acceptable.
     *
     * @deprecated Use {@link #CREDENTIALS_FILTER_PATTERN} with a
     * {@linkplain java.io.ObjectInputFilter.Config#createFilter
     * filter pattern} string instead.
     */
    @Deprecated(since="10", forRemoval=true)
    public static final String CREDENTIAL_TYPES =
            "jmx.remote.rmi.server.credential.types";

    
Name of the attribute that specifies an ObjectInputFilter pattern string to filter classes acceptable for RMIServer.newClient() remote method call. 
 The filter pattern must be in same format as used in Config.createFilter 
 This list of classes allowed by filter should correspond to the transitive closure of the credentials class (or classes) used by the installed JMXAuthenticator associated with the RMIServer implementation. If the attribute is not set then any class is deemed acceptable. 
See Also:
/**
    * Name of the attribute that specifies an
    * {@link ObjectInputFilter} pattern string to filter classes acceptable
    * for {@link RMIServer#newClient(java.lang.Object) RMIServer.newClient()}
    * remote method call.
    * <p>
    * The filter pattern must be in same format as used in
    * {@link java.io.ObjectInputFilter.Config#createFilter}
    * <p>
    * This list of classes allowed by filter should correspond to the
    * transitive closure of the credentials class (or classes) used by the
    * installed {@linkplain JMXAuthenticator} associated with the
    * {@linkplain RMIServer} implementation.
    * If the attribute is not set then any class is deemed acceptable.
    * @see ObjectInputFilter
    */
    public static final String CREDENTIALS_FILTER_PATTERN =
        "jmx.remote.rmi.server.credentials.filter.pattern";

    
This attribute defines a pattern from which to create a ObjectInputFilter that will be used when deserializing objects sent to the JMXConnectorServer by any client. 
 The filter will be called for any class found in the serialized stream sent to server by client, including all JMX defined classes (such as ObjectName), all method parameters, and, if present in the stream, all classes transitively referred by the serial form of any deserialized object. The pattern must be in same format as used in Config.createFilter. It may define a white list of permitted classes, a black list of rejected classes, a maximum depth for the deserialized objects, etc. 
 To be functional, the filter should allow at least all the concrete types in the transitive closure of all objects that might get serialized when serializing all JMX classes referred as parameters in the RMIConnection interface, plus all classes that a client might need to transmit wrapped in 
marshalled objects in order to interoperate with the MBeans registered in the MBeanServer. That would potentially include all the concrete  JMX OpenTypes and the classes they use in their serial form. 
 Care must be taken when defining such a filter, as defining a white list too restrictive or a too wide a black list may prevent legitimate clients from interoperating with the JMXConnectorServer. 
/**
     * This attribute defines a pattern from which to create a
     * {@link java.io.ObjectInputFilter} that will be used when deserializing
     * objects sent to the {@code JMXConnectorServer} by any client.
     * <p>
     * The filter will be called for any class found in the serialized
     * stream sent to server by client, including all JMX defined classes
     * (such as {@link javax.management.ObjectName}), all method parameters,
     * and, if present in the stream, all classes transitively referred by
     * the serial form of any deserialized object.
     * The pattern must be in same format as used in
     * {@link java.io.ObjectInputFilter.Config#createFilter}.
     * It may define a white list of permitted classes, a black list of
     * rejected classes, a maximum depth for the deserialized objects,
     * etc.
     * <p>
     * To be functional, the filter should allow at least all the
     * concrete types in the transitive closure of all objects that
     * might get serialized when serializing all JMX classes referred
     * as parameters in the {@link
     * javax.management.remote.rmi.RMIConnection} interface,
     * plus all classes that a {@link javax.management.remote.rmi.RMIConnector client}
     * might need to transmit wrapped in {@linkplain java.rmi.MarshalledObject
     * marshalled objects} in order to interoperate with the MBeans registered
     * in the {@code MBeanServer}. That would potentially include all the
     * concrete {@linkplain javax.management.openmbean  JMX OpenTypes} and the
     * classes they use in their serial form.
     * <p>
     * Care must be taken when defining such a filter, as defining
     * a white list too restrictive or a too wide a black list may
     * prevent legitimate clients from interoperating with the
     * {@code JMXConnectorServer}.
     */
    public static final String SERIAL_FILTER_PATTERN =
       "jmx.remote.rmi.server.serial.filter.pattern";

    
Makes an RMIConnectorServer. This is equivalent to calling 
RMIConnectorServer(directoryURL,environment,null,null)


Params:
  • url – the URL defining how to create the connector server.
Cannot be null.
  • environment – attributes governing the creation and
storing of the RMI object.  Can be null, which is equivalent to
an empty Map.
Throws:
  • IllegalArgumentException – if url is null.
  • MalformedURLException – if url does not
conform to the syntax for an RMI connector, or if its protocol
is not recognized by this implementation. Only "rmi" is valid when
this constructor is used.
  • IOException – if the connector server cannot be created for some reason or if it is inevitable that its 
start method will fail.
/**
     * <p>Makes an <code>RMIConnectorServer</code>.
     * This is equivalent to calling {@link #RMIConnectorServer(
     * JMXServiceURL,Map,RMIServerImpl,MBeanServer)
     * RMIConnectorServer(directoryURL,environment,null,null)}</p>
     *
     * @param url the URL defining how to create the connector server.
     * Cannot be null.
     *
     * @param environment attributes governing the creation and
     * storing of the RMI object.  Can be null, which is equivalent to
     * an empty Map.
     *
     * @exception IllegalArgumentException if <code>url</code> is null.
     *
     * @exception MalformedURLException if <code>url</code> does not
     * conform to the syntax for an RMI connector, or if its protocol
     * is not recognized by this implementation. Only "rmi" is valid when
     * this constructor is used.
     *
     * @exception IOException if the connector server cannot be created
     * for some reason or if it is inevitable that its {@link #start()
     * start} method will fail.
     */
    public RMIConnectorServer(JMXServiceURL url, Map<String,?> environment)
            throws IOException {
        this(url, environment, (MBeanServer) null);
    }

    
Makes an RMIConnectorServer for the given MBean server. This is equivalent to calling 
RMIConnectorServer(directoryURL,environment,null,mbeanServer)


Params:
  • url – the URL defining how to create the connector server.
Cannot be null.
  • environment – attributes governing the creation and
storing of the RMI object.  Can be null, which is equivalent to
an empty Map.
  • mbeanServer – the MBean server to which the new connector
server is attached, or null if it will be attached by being
registered as an MBean in the MBean server.
Throws:
  • IllegalArgumentException – if url is null.
  • MalformedURLException – if url does not
conform to the syntax for an RMI connector, or if its protocol
is not recognized by this implementation. Only "rmi" is valid
when this constructor is used.
  • IOException – if the connector server cannot be created for some reason or if it is inevitable that its 
start method will fail.
/**
     * <p>Makes an <code>RMIConnectorServer</code> for the given MBean
     * server.
     * This is equivalent to calling {@link #RMIConnectorServer(
     * JMXServiceURL,Map,RMIServerImpl,MBeanServer)
     * RMIConnectorServer(directoryURL,environment,null,mbeanServer)}</p>
     *
     * @param url the URL defining how to create the connector server.
     * Cannot be null.
     *
     * @param environment attributes governing the creation and
     * storing of the RMI object.  Can be null, which is equivalent to
     * an empty Map.
     *
     * @param mbeanServer the MBean server to which the new connector
     * server is attached, or null if it will be attached by being
     * registered as an MBean in the MBean server.
     *
     * @exception IllegalArgumentException if <code>url</code> is null.
     *
     * @exception MalformedURLException if <code>url</code> does not
     * conform to the syntax for an RMI connector, or if its protocol
     * is not recognized by this implementation. Only "rmi" is valid
     * when this constructor is used.
     *
     * @exception IOException if the connector server cannot be created
     * for some reason or if it is inevitable that its {@link #start()
     * start} method will fail.
     */
    public RMIConnectorServer(JMXServiceURL url, Map<String,?> environment,
                              MBeanServer mbeanServer)
            throws IOException {
        this(url, environment, (RMIServerImpl) null, mbeanServer);
    }

    
Makes an RMIConnectorServer for the given MBean
server.


Params:
  • url – the URL defining how to create the connector server.
Cannot be null.
  • environment – attributes governing the creation and
storing of the RMI object.  Can be null, which is equivalent to
an empty Map.
  • rmiServerImpl – An implementation of the RMIServer interface,
 consistent with the protocol type specified in url.
 If this parameter is non null, the protocol type specified by
 url is not constrained, and is assumed to be valid.
 Otherwise, only "rmi" will be recognized.
  • mbeanServer – the MBean server to which the new connector
server is attached, or null if it will be attached by being
registered as an MBean in the MBean server.
Throws:
  • IllegalArgumentException – if url is null.
  • MalformedURLException – if url does not
conform to the syntax for an RMI connector, or if its protocol
is not recognized by this implementation. Only "rmi" is recognized
when rmiServerImpl is null.
  • IOException – if the connector server cannot be created for some reason or if it is inevitable that its 
start method will fail.
See Also:
/**
     * <p>Makes an <code>RMIConnectorServer</code> for the given MBean
     * server.</p>
     *
     * @param url the URL defining how to create the connector server.
     * Cannot be null.
     *
     * @param environment attributes governing the creation and
     * storing of the RMI object.  Can be null, which is equivalent to
     * an empty Map.
     *
     * @param rmiServerImpl An implementation of the RMIServer interface,
     *  consistent with the protocol type specified in <var>url</var>.
     *  If this parameter is non null, the protocol type specified by
     *  <var>url</var> is not constrained, and is assumed to be valid.
     *  Otherwise, only "rmi" will be recognized.
     *
     * @param mbeanServer the MBean server to which the new connector
     * server is attached, or null if it will be attached by being
     * registered as an MBean in the MBean server.
     *
     * @exception IllegalArgumentException if <code>url</code> is null.
     *
     * @exception MalformedURLException if <code>url</code> does not
     * conform to the syntax for an RMI connector, or if its protocol
     * is not recognized by this implementation. Only "rmi" is recognized
     * when <var>rmiServerImpl</var> is null.
     *
     * @exception IOException if the connector server cannot be created
     * for some reason or if it is inevitable that its {@link #start()
     * start} method will fail.
     *
     * @see #start
     */
    public RMIConnectorServer(JMXServiceURL url, Map<String,?> environment,
                              RMIServerImpl rmiServerImpl,
                              MBeanServer mbeanServer)
            throws IOException {
        super(mbeanServer);

        if (url == null) throw new
            IllegalArgumentException("Null JMXServiceURL");
        if (rmiServerImpl == null) {
            final String prt = url.getProtocol();
            if (prt == null || !(prt.equals("rmi"))) {
                final String msg = "Invalid protocol type: " + prt;
                throw new MalformedURLException(msg);
            }
            final String urlPath = url.getURLPath();
            if (!urlPath.isEmpty()
                && !urlPath.equals("/")
                && !urlPath.startsWith("/jndi/")) {
                final String msg = "URL path must be empty or start with " +
                    "/jndi/";
                throw new MalformedURLException(msg);
            }
        }

        if (environment == null)
            this.attributes = Collections.emptyMap();
        else {
            EnvHelp.checkAttributes(environment);
            this.attributes = Collections.unmodifiableMap(environment);
        }

        this.address = url;
        this.rmiServerImpl = rmiServerImpl;
    }

    
Returns a client stub for this connector server. A client stub is a serializable object whose connect method can be used to make one new connection to this connector server.


Params:
  • env – client connection parameters of the same sort that could be provided to 
JMXConnector.connect(Map). Can be null, which is equivalent to an empty map.
Throws:
Returns:a client stub that can be used to make a new connection
to this connector server.
/**
     * <p>Returns a client stub for this connector server.  A client
     * stub is a serializable object whose {@link
     * JMXConnector#connect(Map) connect} method can be used to make
     * one new connection to this connector server.</p>
     *
     * @param env client connection parameters of the same sort that
     * could be provided to {@link JMXConnector#connect(Map)
     * JMXConnector.connect(Map)}.  Can be null, which is equivalent
     * to an empty map.
     *
     * @return a client stub that can be used to make a new connection
     * to this connector server.
     *
     * @exception UnsupportedOperationException if this connector
     * server does not support the generation of client stubs.
     *
     * @exception IllegalStateException if the JMXConnectorServer is
     * not started (see {@link #isActive()}).
     *
     * @exception IOException if a communications problem means that a
     * stub cannot be created.
     **/
    public JMXConnector toJMXConnector(Map<String,?> env) throws IOException {
        // The serialized for of rmiServerImpl is automatically
        // a RMI server stub.
        if (!isActive()) throw new
            IllegalStateException("Connector is not active");

        // Merge maps
        Map<String, Object> usemap = new HashMap<String, Object>(
                (this.attributes==null)?Collections.<String, Object>emptyMap():
                    this.attributes);

        if (env != null) {
            EnvHelp.checkAttributes(env);
            usemap.putAll(env);
        }

        usemap = EnvHelp.filterAttributes(usemap);

        final RMIServer stub=(RMIServer)rmiServerImpl.toStub();

        return new RMIConnector(stub, usemap);
    }

    
Activates the connector server, that is starts listening for
client connections.  Calling this method when the connector
server is already active has no effect.  Calling this method
when the connector server has been stopped will generate an
IOException.


The behavior of this method when called for the first time
depends on the parameters that were supplied at construction,
as described below.


First, an object of a subclass of RMIServerImpl is required, to export the connector server through RMI:


    

  • If an RMIServerImpl was supplied to the
constructor, it is used.

  • Otherwise, if the JMXServiceURL
was null, or its protocol part was rmi, an object of type RMIJRMPServerImpl is created. 
  • Otherwise, the implementation can create an implementation-specific RMIServerImpl or it can throw MalformedURLException. 


If the given address includes a JNDI directory URL as specified in the package documentation for rmi, then this RMIConnectorServer will bootstrap by binding the
RMIServerImpl to the given address.


If the URL path part of the JMXServiceURL was
empty or a single slash (/), then the RMI object will not be bound to a directory. Instead, a reference to it will be encoded in the URL path of the RMIConnectorServer address (returned by getAddress()). The encodings for rmi are described in the package documentation for rmi.


The behavior when the URL path is neither empty nor a JNDI
directory URL, or when the protocol is not rmi, is implementation defined, and may include throwing MalformedURLException when the connector server is created or when it is started.


Throws:
/**
     * <p>Activates the connector server, that is starts listening for
     * client connections.  Calling this method when the connector
     * server is already active has no effect.  Calling this method
     * when the connector server has been stopped will generate an
     * <code>IOException</code>.</p>
     *
     * <p>The behavior of this method when called for the first time
     * depends on the parameters that were supplied at construction,
     * as described below.</p>
     *
     * <p>First, an object of a subclass of {@link RMIServerImpl} is
     * required, to export the connector server through RMI:</p>
     *
     * <ul>
     *
     * <li>If an <code>RMIServerImpl</code> was supplied to the
     * constructor, it is used.
     *
     * <li>Otherwise, if the <code>JMXServiceURL</code>
     * was null, or its protocol part was <code>rmi</code>, an object
     * of type {@link RMIJRMPServerImpl} is created.
     *
     * <li>Otherwise, the implementation can create an
     * implementation-specific {@link RMIServerImpl} or it can throw
     * {@link MalformedURLException}.
     *
     * </ul>
     *
     * <p>If the given address includes a JNDI directory URL as
     * specified in the package documentation for {@link
     * javax.management.remote.rmi}, then this
     * <code>RMIConnectorServer</code> will bootstrap by binding the
     * <code>RMIServerImpl</code> to the given address.</p>
     *
     * <p>If the URL path part of the <code>JMXServiceURL</code> was
     * empty or a single slash (<code>/</code>), then the RMI object
     * will not be bound to a directory.  Instead, a reference to it
     * will be encoded in the URL path of the RMIConnectorServer
     * address (returned by {@link #getAddress()}).  The encodings for
     * <code>rmi</code> are described in the package documentation for
     * {@link javax.management.remote.rmi}.</p>
     *
     * <p>The behavior when the URL path is neither empty nor a JNDI
     * directory URL, or when the protocol is not <code>rmi</code>,
     * is implementation defined, and may include throwing
     * {@link MalformedURLException} when the connector server is created
     * or when it is started.</p>
     *
     * @exception IllegalStateException if the connector server has
     * not been attached to an MBean server.
     * @exception IOException if the connector server cannot be
     * started.
     */
    public synchronized void start() throws IOException {
        final boolean tracing = logger.traceOn();

        if (state == STARTED) {
            if (tracing) logger.trace("start", "already started");
            return;
        } else if (state == STOPPED) {
            if (tracing) logger.trace("start", "already stopped");
            throw new IOException("The server has been stopped.");
        }

        if (getMBeanServer() == null)
            throw new IllegalStateException("This connector server is not " +
                                            "attached to an MBean server");

        // Check the internal access file property to see
        // if an MBeanServerForwarder is to be provided
        //
        if (attributes != null) {
            // Check if access file property is specified
            //
            String accessFile =
                (String) attributes.get("jmx.remote.x.access.file");
            if (accessFile != null) {
                // Access file property specified, create an instance
                // of the MBeanServerFileAccessController class
                //
                MBeanServerForwarder mbsf;
                try {
                    mbsf = new MBeanServerFileAccessController(accessFile);
                } catch (IOException e) {
                    throw EnvHelp.initCause(
                        new IllegalArgumentException(e.getMessage()), e);
                }
                // Set the MBeanServerForwarder
                //
                setMBeanServerForwarder(mbsf);
            }
        }

        try {
            if (tracing) logger.trace("start", "setting default class loader");
            defaultClassLoader = EnvHelp.resolveServerClassLoader(
                    attributes, getMBeanServer());
        } catch (InstanceNotFoundException infc) {
            IllegalArgumentException x = new
                IllegalArgumentException("ClassLoader not found: "+infc);
            throw EnvHelp.initCause(x,infc);
        }

        if (tracing) logger.trace("start", "setting RMIServer object");
        final RMIServerImpl rmiServer;

        if (rmiServerImpl != null)
            rmiServer = rmiServerImpl;
        else
            rmiServer = newServer();

        rmiServer.setMBeanServer(getMBeanServer());
        rmiServer.setDefaultClassLoader(defaultClassLoader);
        rmiServer.setRMIConnectorServer(this);
        rmiServer.export();

        try {
            if (tracing) logger.trace("start", "getting RMIServer object to export");
            final RMIServer objref = objectToBind(rmiServer, attributes);

            if (address != null && address.getURLPath().startsWith("/jndi/")) {
                final String jndiUrl = address.getURLPath().substring(6);

                if (tracing)
                    logger.trace("start", "Using external directory: " + jndiUrl);

                String stringBoolean = (String) attributes.get(JNDI_REBIND_ATTRIBUTE);
                final boolean rebind = EnvHelp.computeBooleanFromString( stringBoolean );

                if (tracing)
                    logger.trace("start", JNDI_REBIND_ATTRIBUTE + "=" + rebind);

                try {
                    if (tracing) logger.trace("start", "binding to " + jndiUrl);

                    final Hashtable<?, ?> usemap = EnvHelp.mapToHashtable(attributes);

                    bind(jndiUrl, usemap, objref, rebind);

                    boundJndiUrl = jndiUrl;
                } catch (NamingException e) {
                    // fit e in the nested exception if we are on 1.4
                    throw newIOException("Cannot bind to URL ["+jndiUrl+"]: "
                                         + e, e);
                }
            } else {
                // if jndiURL is null, we must encode the stub into the URL.
                if (tracing) logger.trace("start", "Encoding URL");

                encodeStubInAddress(objref, attributes);

                if (tracing) logger.trace("start", "Encoded URL: " + this.address);
            }
        } catch (Exception e) {
            try {
                rmiServer.close();
            } catch (Exception x) {
                // OK: we are already throwing another exception
            }
            if (e instanceof RuntimeException)
                throw (RuntimeException) e;
            else if (e instanceof IOException)
                throw (IOException) e;
            else
                throw newIOException("Got unexpected exception while " +
                                     "starting the connector server: "
                                     + e, e);
        }

        rmiServerImpl = rmiServer;

        synchronized(openedServers) {
            openedServers.add(this);
        }

        state = STARTED;

        if (tracing) {
            logger.trace("start", "Connector Server Address = " + address);
            logger.trace("start", "started.");
        }
    }

    
Deactivates the connector server, that is, stops listening for
client connections.  Calling this method will also close all
client connections that were made by this server.  After this
method returns, whether normally or with an exception, the
connector server will not create any new client
connections.


Once a connector server has been stopped, it cannot be started
again.


Calling this method when the connector server has already
been stopped has no effect.  Calling this method when the
connector server has not yet been started will disable the
connector server object permanently.


If closing a client connection produces an exception, that exception is not thrown from this method. A JMXConnectionNotification is emitted from this MBean with the connection ID of the connection that could not be closed.


Closing a connector server is a potentially slow operation.
For example, if a client machine with an open connection has
crashed, the close operation might have to wait for a network
protocol timeout.  Callers that do not want to block in a close
operation should do it in a separate thread.


This method calls the method 
close on the connector server's RMIServerImpl
object.


If the RMIServerImpl was bound to a JNDI directory by the start method, it is unbound from the directory by this method.


Throws:
  • IOException – if the server cannot be closed cleanly,
or if the RMIServerImpl cannot be unbound from the directory. When this exception is thrown, the server has already attempted to close all client connections, if appropriate; to call RMIServerImpl.close(); and to unbind the RMIServerImpl from its directory, if
appropriate.  All client connections are closed except possibly
those that generated exceptions when the server attempted to
close them.
/**
     * <p>Deactivates the connector server, that is, stops listening for
     * client connections.  Calling this method will also close all
     * client connections that were made by this server.  After this
     * method returns, whether normally or with an exception, the
     * connector server will not create any new client
     * connections.</p>
     *
     * <p>Once a connector server has been stopped, it cannot be started
     * again.</p>
     *
     * <p>Calling this method when the connector server has already
     * been stopped has no effect.  Calling this method when the
     * connector server has not yet been started will disable the
     * connector server object permanently.</p>
     *
     * <p>If closing a client connection produces an exception, that
     * exception is not thrown from this method.  A {@link
     * JMXConnectionNotification} is emitted from this MBean with the
     * connection ID of the connection that could not be closed.</p>
     *
     * <p>Closing a connector server is a potentially slow operation.
     * For example, if a client machine with an open connection has
     * crashed, the close operation might have to wait for a network
     * protocol timeout.  Callers that do not want to block in a close
     * operation should do it in a separate thread.</p>
     *
     * <p>This method calls the method {@link RMIServerImpl#close()
     * close} on the connector server's <code>RMIServerImpl</code>
     * object.</p>
     *
     * <p>If the <code>RMIServerImpl</code> was bound to a JNDI
     * directory by the {@link #start() start} method, it is unbound
     * from the directory by this method.</p>
     *
     * @exception IOException if the server cannot be closed cleanly,
     * or if the <code>RMIServerImpl</code> cannot be unbound from the
     * directory.  When this exception is thrown, the server has
     * already attempted to close all client connections, if
     * appropriate; to call {@link RMIServerImpl#close()}; and to
     * unbind the <code>RMIServerImpl</code> from its directory, if
     * appropriate.  All client connections are closed except possibly
     * those that generated exceptions when the server attempted to
     * close them.
     */
    public void stop() throws IOException {
        final boolean tracing = logger.traceOn();

        synchronized (this) {
            if (state == STOPPED) {
                if (tracing) logger.trace("stop","already stopped.");
                return;
            } else if (state == CREATED) {
                if (tracing) logger.trace("stop","not started yet.");
            }

            if (tracing) logger.trace("stop", "stopping.");
            state = STOPPED;
        }

        synchronized(openedServers) {
            openedServers.remove(this);
        }

        IOException exception = null;

        // rmiServerImpl can be null if stop() called without start()
        if (rmiServerImpl != null) {
            try {
                if (tracing) logger.trace("stop", "closing RMI server.");
                rmiServerImpl.close();
            } catch (IOException e) {
                if (tracing) logger.trace("stop", "failed to close RMI server: " + e);
                if (logger.debugOn()) logger.debug("stop",e);
                exception = e;
            }
        }

        if (boundJndiUrl != null) {
            try {
                if (tracing)
                    logger.trace("stop",
                          "unbind from external directory: " + boundJndiUrl);

                final Hashtable<?, ?> usemap = EnvHelp.mapToHashtable(attributes);

                InitialContext ctx =
                    new InitialContext(usemap);

                ctx.unbind(boundJndiUrl);

                ctx.close();
            } catch (NamingException e) {
                if (tracing) logger.trace("stop", "failed to unbind RMI server: "+e);
                if (logger.debugOn()) logger.debug("stop",e);
                // fit e in as the nested exception if we are on 1.4
                if (exception == null)
                    exception = newIOException("Cannot bind to URL: " + e, e);
            }
        }

        if (exception != null) throw exception;

        if (tracing) logger.trace("stop", "stopped");
    }

    public synchronized boolean isActive() {
        return (state == STARTED);
    }

    public JMXServiceURL getAddress() {
        if (!isActive())
            return null;
        return address;
    }

    public Map<String,?> getAttributes() {
        Map<String, ?> map = EnvHelp.filterAttributes(attributes);
        return Collections.unmodifiableMap(map);
    }

    @Override
    public synchronized
        void setMBeanServerForwarder(MBeanServerForwarder mbsf) {
        super.setMBeanServerForwarder(mbsf);
        if (rmiServerImpl != null)
            rmiServerImpl.setMBeanServer(getMBeanServer());
    }

    /* We repeat the definitions of connection{Opened,Closed,Failed}
       here so that they are accessible to other classes in this package
       even though they have protected access.  */

    @Override
    protected void connectionOpened(String connectionId, String message,
                                    Object userData) {
        super.connectionOpened(connectionId, message, userData);
    }

    @Override
    protected void connectionClosed(String connectionId, String message,
                                    Object userData) {
        super.connectionClosed(connectionId, message, userData);
    }

    @Override
    protected void connectionFailed(String connectionId, String message,
                                    Object userData) {
        super.connectionFailed(connectionId, message, userData);
    }

    
Bind a stub to a registry.

Params:
  • jndiUrl – URL of the stub in the registry, extracted
       from the JMXServiceURL.
  • attributes – A Hashtable containing environment parameters,
       built from the Map specified at this object creation.
  • rmiServer – The object to bind in the registry
  • rebind – true if the object must be rebound.
/**
     * Bind a stub to a registry.
     * @param jndiUrl URL of the stub in the registry, extracted
     *        from the <code>JMXServiceURL</code>.
     * @param attributes A Hashtable containing environment parameters,
     *        built from the Map specified at this object creation.
     * @param rmiServer The object to bind in the registry
     * @param rebind true if the object must be rebound.
     **/
    void bind(String jndiUrl, Hashtable<?, ?> attributes,
              RMIServer rmiServer, boolean rebind)
        throws NamingException, MalformedURLException {
        // if jndiURL is not null, we nust bind the stub to a
        // directory.
        InitialContext ctx =
            new InitialContext(attributes);

        if (rebind)
            ctx.rebind(jndiUrl, rmiServer);
        else
            ctx.bind(jndiUrl, rmiServer);
        ctx.close();
    }

    
Creates a new RMIServerImpl.

/**
     * Creates a new RMIServerImpl.
     **/
    RMIServerImpl newServer() throws IOException {
        final int port;
        if (address == null)
            port = 0;
        else
            port = address.getPort();

        return newJRMPServer(attributes, port);
    }

    
Encode a stub into the JMXServiceURL.

Params:
  • rmiServer – The stub object to encode in the URL
  • attributes – A Map containing environment parameters,
       built from the Map specified at this object creation.
/**
     * Encode a stub into the JMXServiceURL.
     * @param rmiServer The stub object to encode in the URL
     * @param attributes A Map containing environment parameters,
     *        built from the Map specified at this object creation.
     **/
    private void encodeStubInAddress(
            RMIServer rmiServer, Map<String, ?> attributes)
            throws IOException {

        final String protocol, host;
        final int port;

        if (address == null) {
            protocol = "rmi";
            host = null; // will default to local host name
            port = 0;
        } else {
            protocol = address.getProtocol();
            host = (address.getHost().isEmpty()) ? null : address.getHost();
            port = address.getPort();
        }

        final String urlPath = encodeStub(rmiServer, attributes);

        address = new JMXServiceURL(protocol, host, port, urlPath);
    }

    
Returns the IOR of the given rmiServer.

/**
     * Returns the IOR of the given rmiServer.
     **/
    static String encodeStub(
            RMIServer rmiServer, Map<String, ?> env) throws IOException {
        return "/stub/" + encodeJRMPStub(rmiServer, env);
    }

    static String encodeJRMPStub(
            RMIServer rmiServer, Map<String, ?> env)
            throws IOException {
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        ObjectOutputStream oout = new ObjectOutputStream(bout);
        oout.writeObject(rmiServer);
        oout.close();
        byte[] bytes = bout.toByteArray();
        return byteArrayToBase64(bytes);
    }

    
Object that we will bind to the registry.
This object is a stub connected to our RMIServerImpl.

/**
     * Object that we will bind to the registry.
     * This object is a stub connected to our RMIServerImpl.
     **/
    private static RMIServer objectToBind(
            RMIServerImpl rmiServer, Map<String, ?> env)
        throws IOException {
        return (RMIServer)rmiServer.toStub();
    }

    private static RMIServerImpl newJRMPServer(Map<String, ?> env, int port)
            throws IOException {
        RMIClientSocketFactory csf = (RMIClientSocketFactory)
            env.get(RMI_CLIENT_SOCKET_FACTORY_ATTRIBUTE);
        RMIServerSocketFactory ssf = (RMIServerSocketFactory)
            env.get(RMI_SERVER_SOCKET_FACTORY_ATTRIBUTE);
        return new RMIJRMPServerImpl(port, csf, ssf, env);
    }

    private static String byteArrayToBase64(byte[] a) {
        int aLen = a.length;
        int numFullGroups = aLen/3;
        int numBytesInPartialGroup = aLen - 3*numFullGroups;
        int resultLen = 4*((aLen + 2)/3);
        final StringBuilder result = new StringBuilder(resultLen);

        // Translate all full groups from byte array elements to Base64
        int inCursor = 0;
        for (int i=0; i<numFullGroups; i++) {
            int byte0 = a[inCursor++] & 0xff;
            int byte1 = a[inCursor++] & 0xff;
            int byte2 = a[inCursor++] & 0xff;
            result.append(intToAlpha[byte0 >> 2]);
            result.append(intToAlpha[(byte0 << 4)&0x3f | (byte1 >> 4)]);
            result.append(intToAlpha[(byte1 << 2)&0x3f | (byte2 >> 6)]);
            result.append(intToAlpha[byte2 & 0x3f]);
        }

        // Translate partial group if present
        if (numBytesInPartialGroup != 0) {
            int byte0 = a[inCursor++] & 0xff;
            result.append(intToAlpha[byte0 >> 2]);
            if (numBytesInPartialGroup == 1) {
                result.append(intToAlpha[(byte0 << 4) & 0x3f]);
                result.append("==");
            } else {
                // assert numBytesInPartialGroup == 2;
                int byte1 = a[inCursor++] & 0xff;
                result.append(intToAlpha[(byte0 << 4)&0x3f | (byte1 >> 4)]);
                result.append(intToAlpha[(byte1 << 2)&0x3f]);
                result.append('=');
            }
        }
        // assert inCursor == a.length;
        // assert result.length() == resultLen;
        return result.toString();
    }

    
This array is a lookup table that translates 6-bit positive integer
index values into their "Base64 Alphabet" equivalents as specified
in Table 1 of RFC 2045.

/**
     * This array is a lookup table that translates 6-bit positive integer
     * index values into their "Base64 Alphabet" equivalents as specified
     * in Table 1 of RFC 2045.
     */
    private static final char intToAlpha[] = {
        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
        'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
        'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
    };

    
Construct a new IOException with a nested exception. The nested exception is set only if JDK >= 1.4 
/**
     * Construct a new IOException with a nested exception.
     * The nested exception is set only if JDK {@literal >= 1.4}
     */
    private static IOException newIOException(String message,
                                              Throwable cause) {
        final IOException x = new IOException(message);
        return EnvHelp.initCause(x,cause);
    }


    // Private variables
    // -----------------

    private static ClassLogger logger =
        new ClassLogger("javax.management.remote.rmi", "RMIConnectorServer");

    private JMXServiceURL address;
    private RMIServerImpl rmiServerImpl;
    private final Map<String, ?> attributes;
    private ClassLoader defaultClassLoader = null;

    private String boundJndiUrl;

    // state
    private static final int CREATED = 0;
    private static final int STARTED = 1;
    private static final int STOPPED = 2;

    private int state = CREATED;
    private final static Set<RMIConnectorServer> openedServers =
            new HashSet<RMIConnectorServer>();
}