https://openjdk.java.net/ 
/*
 * Copyright (c) 2003, 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;


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

import java.io.IOException;
import java.io.UncheckedIOException;
import java.net.MalformedURLException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.ServiceLoader.Provider;
import java.util.function.Predicate;

import javax.management.MBeanServer;
import javax.management.remote.JMXConnectorFactory.ConnectorFactory;


Factory to create JMX API connector servers.  There
are no instances of this class.


Each connector server is created by an instance of JMXConnectorServerProvider. This instance is found as follows. Suppose the given JMXServiceURL looks like "service:jmx:protocol:remainder". Then the factory will attempt to find the appropriate JMXConnectorServerProvider for protocol.  Each
occurrence of the character + or - in
protocol is replaced by . or
_, respectively.


A provider package list is searched for as follows:


    

  1. If the environment parameter to 
newJMXConnectorServer contains the key jmx.remote.protocol.provider.pkgs then the associated
value is the provider package list.

  2. Otherwise, if the system property
jmx.remote.protocol.provider.pkgs exists, then its value
is the provider package list.

  3. Otherwise, there is no provider package list.



The provider package list is a string that is interpreted as a
list of non-empty Java package names separated by vertical bars
(|). If the string is empty, then so is the provider package list. If the provider package list is not a String, or if it contains an element that is an empty string, a JMXProviderException is thrown.


If the provider package list exists and is not empty, then for
each element pkg of the list, the factory
will attempt to load the class


pkg.protocol.ServerProvider



If the environment parameter to 
newJMXConnectorServer contains the key jmx.remote.protocol.provider.class.loader then the associated value is the class loader to use to load the provider. If the associated value is not an instance of ClassLoader, an IllegalArgumentException is thrown.


If the jmx.remote.protocol.provider.class.loader
key is not present in the environment parameter, the
calling thread's context class loader is used.


If the attempt to load this class produces a ClassNotFoundException, the search for a handler continues with the next element of the list.


Otherwise, a problem with the provider found is signalled by a JMXProviderException whose cause indicates the underlying exception, as follows:


    

  • if the attempt to load the class produces an exception other
than ClassNotFoundException, that is the
cause;

  • if Class.newInstance() for the class produces an exception, that is the cause.



If no provider is found by the above steps, including the
default case where there is no provider package list, then the
implementation will use its own provider for
protocol, or it will throw a
MalformedURLException if there is none.  An
implementation may choose to find providers by other means.  For
example, it may support service providers,
where the service interface is JMXConnectorServerProvider.


Every implementation must support the RMI connector protocol with
the default RMI transport, specified with string rmi.



Once a provider is found, the result of the
newJMXConnectorServer method is the result of calling newJMXConnectorServer on the provider.


The Map parameter passed to the
JMXConnectorServerProvider is a new read-only
Map that contains all the entries that were in the
environment parameter to 
JMXConnectorServerFactory.newJMXConnectorServer, if there was one. Additionally, if the jmx.remote.protocol.provider.class.loader key is not
present in the environment parameter, it is added to
the new read-only Map. The associated value is the
calling thread's context class loader.


Since:1.5
/**
 * <p>Factory to create JMX API connector servers.  There
 * are no instances of this class.</p>
 *
 * <p>Each connector server is created by an instance of {@link
 * JMXConnectorServerProvider}.  This instance is found as follows.  Suppose
 * the given {@link JMXServiceURL} looks like
 * <code>"service:jmx:<em>protocol</em>:<em>remainder</em>"</code>.
 * Then the factory will attempt to find the appropriate {@link
 * JMXConnectorServerProvider} for <code><em>protocol</em></code>.  Each
 * occurrence of the character <code>+</code> or <code>-</code> in
 * <code><em>protocol</em></code> is replaced by <code>.</code> or
 * <code>_</code>, respectively.</p>
 *
 * <p>A <em>provider package list</em> is searched for as follows:</p>
 *
 * <ol>
 *
 * <li>If the <code>environment</code> parameter to {@link
 * #newJMXConnectorServer(JMXServiceURL,Map,MBeanServer)
 * newJMXConnectorServer} contains the key
 * <code>jmx.remote.protocol.provider.pkgs</code> then the associated
 * value is the provider package list.
 *
 * <li>Otherwise, if the system property
 * <code>jmx.remote.protocol.provider.pkgs</code> exists, then its value
 * is the provider package list.
 *
 * <li>Otherwise, there is no provider package list.
 *
 * </ol>
 *
 * <p>The provider package list is a string that is interpreted as a
 * list of non-empty Java package names separated by vertical bars
 * (<code>|</code>).  If the string is empty, then so is the provider
 * package list.  If the provider package list is not a String, or if
 * it contains an element that is an empty string, a {@link
 * JMXProviderException} is thrown.</p>
 *
 * <p>If the provider package list exists and is not empty, then for
 * each element <code><em>pkg</em></code> of the list, the factory
 * will attempt to load the class
 *
 * <blockquote>
 * <code><em>pkg</em>.<em>protocol</em>.ServerProvider</code>
 * </blockquote>

 * <p>If the <code>environment</code> parameter to {@link
 * #newJMXConnectorServer(JMXServiceURL, Map, MBeanServer)
 * newJMXConnectorServer} contains the key
 * <code>jmx.remote.protocol.provider.class.loader</code> then the
 * associated value is the class loader to use to load the provider.
 * If the associated value is not an instance of {@link
 * java.lang.ClassLoader}, an {@link
 * java.lang.IllegalArgumentException} is thrown.</p>
 *
 * <p>If the <code>jmx.remote.protocol.provider.class.loader</code>
 * key is not present in the <code>environment</code> parameter, the
 * calling thread's context class loader is used.</p>
 *
 * <p>If the attempt to load this class produces a {@link
 * ClassNotFoundException}, the search for a handler continues with
 * the next element of the list.</p>
 *
 * <p>Otherwise, a problem with the provider found is signalled by a
 * {@link JMXProviderException} whose {@link
 * JMXProviderException#getCause() <em>cause</em>} indicates the
 * underlying exception, as follows:</p>
 *
 * <ul>
 *
 * <li>if the attempt to load the class produces an exception other
 * than <code>ClassNotFoundException</code>, that is the
 * <em>cause</em>;
 *
 * <li>if {@link Class#newInstance()} for the class produces an
 * exception, that is the <em>cause</em>.
 *
 * </ul>
 *
 * <p>If no provider is found by the above steps, including the
 * default case where there is no provider package list, then the
 * implementation will use its own provider for
 * <code><em>protocol</em></code>, or it will throw a
 * <code>MalformedURLException</code> if there is none.  An
 * implementation may choose to find providers by other means.  For
 * example, it may support <a
 * href="{@docRoot}/java/util/ServiceLoader.html#developing-service-providers">service providers</a>,
 * where the service interface is <code>JMXConnectorServerProvider</code>.</p>
 *
 * <p>Every implementation must support the RMI connector protocol with
 * the default RMI transport, specified with string <code>rmi</code>.
 * </p>
 *
 * <p>Once a provider is found, the result of the
 * <code>newJMXConnectorServer</code> method is the result of calling
 * {@link
 * JMXConnectorServerProvider#newJMXConnectorServer(JMXServiceURL,
 * Map, MBeanServer) newJMXConnectorServer} on the provider.</p>
 *
 * <p>The <code>Map</code> parameter passed to the
 * <code>JMXConnectorServerProvider</code> is a new read-only
 * <code>Map</code> that contains all the entries that were in the
 * <code>environment</code> parameter to {@link
 * #newJMXConnectorServer(JMXServiceURL,Map,MBeanServer)
 * JMXConnectorServerFactory.newJMXConnectorServer}, if there was one.
 * Additionally, if the
 * <code>jmx.remote.protocol.provider.class.loader</code> key is not
 * present in the <code>environment</code> parameter, it is added to
 * the new read-only <code>Map</code>. The associated value is the
 * calling thread's context class loader.</p>
 *
 * @since 1.5
 */
public class JMXConnectorServerFactory {

    
Name of the attribute that specifies the default class loader. This class loader is used to deserialize objects in requests received from the client, possibly after consulting an MBean-specific class loader. The value associated with this attribute is an instance of ClassLoader.


/**
     * <p>Name of the attribute that specifies the default class
     * loader.  This class loader is used to deserialize objects in
     * requests received from the client, possibly after consulting an
     * MBean-specific class loader.  The value associated with this
     * attribute is an instance of {@link ClassLoader}.</p>
     */
    public static final String DEFAULT_CLASS_LOADER =
        JMXConnectorFactory.DEFAULT_CLASS_LOADER;

    
Name of the attribute that specifies the default class loader MBean name. This class loader is used to deserialize objects in requests received from the client, possibly after consulting an MBean-specific class loader. The value associated with this attribute is an instance of 
ObjectName.


/**
     * <p>Name of the attribute that specifies the default class
     * loader MBean name.  This class loader is used to deserialize objects in
     * requests received from the client, possibly after consulting an
     * MBean-specific class loader.  The value associated with this
     * attribute is an instance of {@link javax.management.ObjectName
     * ObjectName}.</p>
     */
    public static final String DEFAULT_CLASS_LOADER_NAME =
        "jmx.remote.default.class.loader.name";

    
Name of the attribute that specifies the provider packages
that are consulted when looking for the handler for a protocol.
The value associated with this attribute is a string with
package names separated by vertical bars (|).


/**
     * <p>Name of the attribute that specifies the provider packages
     * that are consulted when looking for the handler for a protocol.
     * The value associated with this attribute is a string with
     * package names separated by vertical bars (<code>|</code>).</p>
     */
    public static final String PROTOCOL_PROVIDER_PACKAGES =
        "jmx.remote.protocol.provider.pkgs";

    
Name of the attribute that specifies the class loader for loading protocol providers. The value associated with this attribute is an instance of ClassLoader.


/**
     * <p>Name of the attribute that specifies the class
     * loader for loading protocol providers.
     * The value associated with this attribute is an instance
     * of {@link ClassLoader}.</p>
     */
    public static final String PROTOCOL_PROVIDER_CLASS_LOADER =
        "jmx.remote.protocol.provider.class.loader";

    private static final String PROTOCOL_PROVIDER_DEFAULT_PACKAGE =
        "com.sun.jmx.remote.protocol";

    private static final ClassLogger logger =
        new ClassLogger("javax.management.remote.misc","JMXConnectorServerFactory");

    
There are no instances of this class.  
/** There are no instances of this class.  */
    private JMXConnectorServerFactory() {
    }

    private static JMXConnectorServer
        getConnectorServerAsService(ClassLoader loader, JMXServiceURL url,
                                    Map<String, ?> map, MBeanServer mbs,
                                    Predicate<Provider<?>> filter)
        throws IOException {
        final ConnectorFactory<JMXConnectorServerProvider,JMXConnectorServer>
              factory = (p) -> p.newJMXConnectorServer(url, map, mbs);
        return JMXConnectorFactory.getConnectorAsService(
                                     JMXConnectorServerProvider.class,
                                     loader, url, filter, factory);
    }

    
Creates a connector server at the given address. The resultant server is not started until its start method is called.


Params:
  • serviceURL – the address of the new connector server. The actual address of the new connector server, as returned by its getAddress method, will not necessarily be exactly the same. For example, it might include a port number if the original address did not.
  • environment – a set of attributes to control the new
connector server's behavior.  This parameter can be null.
Keys in this map must be Strings.  The appropriate type of each
associated value depends on the attribute.  The contents of
environment are not changed by this call.
  • mbeanServer – the MBean server that this connector server
is attached to.  Null if this connector server will be attached
to an MBean server by being registered in it.
Throws:
Returns:a JMXConnectorServer representing the new
connector server.  Each successful call to this method produces
a different object.
/**
     * <p>Creates a connector server at the given address.  The
     * resultant server is not started until its {@link
     * JMXConnectorServer#start() start} method is called.</p>
     *
     * @param serviceURL the address of the new connector server.  The
     * actual address of the new connector server, as returned by its
     * {@link JMXConnectorServer#getAddress() getAddress} method, will
     * not necessarily be exactly the same.  For example, it might
     * include a port number if the original address did not.
     *
     * @param environment a set of attributes to control the new
     * connector server's behavior.  This parameter can be null.
     * Keys in this map must be Strings.  The appropriate type of each
     * associated value depends on the attribute.  The contents of
     * <code>environment</code> are not changed by this call.
     *
     * @param mbeanServer the MBean server that this connector server
     * is attached to.  Null if this connector server will be attached
     * to an MBean server by being registered in it.
     *
     * @return a <code>JMXConnectorServer</code> representing the new
     * connector server.  Each successful call to this method produces
     * a different object.
     *
     * @exception NullPointerException if <code>serviceURL</code> is null.
     *
     * @exception IOException if the connector server cannot be made
     * because of a communication problem.
     *
     * @exception MalformedURLException if there is no provider for the
     * protocol in <code>serviceURL</code>.
     *
     * @exception JMXProviderException if there is a provider for the
     * protocol in <code>serviceURL</code> but it cannot be used for
     * some reason.
     */
    public static JMXConnectorServer
        newJMXConnectorServer(JMXServiceURL serviceURL,
                              Map<String,?> environment,
                              MBeanServer mbeanServer)
            throws IOException {
        Map<String, Object> envcopy;
        if (environment == null)
            envcopy = new HashMap<String, Object>();
        else {
            EnvHelp.checkAttributes(environment);
            envcopy = new HashMap<String, Object>(environment);
        }

        final Class<JMXConnectorServerProvider> targetInterface =
                JMXConnectorServerProvider.class;
        final ClassLoader loader =
            JMXConnectorFactory.resolveClassLoader(envcopy);
        final String protocol = serviceURL.getProtocol();
        final String providerClassName = "ServerProvider";

        JMXConnectorServerProvider provider =
            JMXConnectorFactory.getProvider(serviceURL,
                                            envcopy,
                                            providerClassName,
                                            targetInterface,
                                            loader);

        IOException exception = null;
        JMXConnectorServer connection = null;
        if (provider == null) {
            Predicate<Provider<?>> systemProvider =
                    JMXConnectorFactory::isSystemProvider;
            // Loader is null when context class loader is set to null
            // and no loader has been provided in map.
            // com.sun.jmx.remote.util.Service class extracted from j2se
            // provider search algorithm doesn't handle well null classloader.
            if (loader != null) {
                try {
                    connection =
                        getConnectorServerAsService(loader,
                                                    serviceURL,
                                                    envcopy,
                                                    mbeanServer,
                                                    systemProvider.negate());
                    if (connection != null)
                        return connection;
                } catch (JMXProviderException e) {
                    throw e;
                } catch (IOException e) {
                    exception = e;
                }
            }
            connection = getConnectorServerAsService(
                            JMXConnectorFactory.class.getClassLoader(),
                            serviceURL,
                            Collections.unmodifiableMap(envcopy),
                            mbeanServer,
                            systemProvider);
            if (connection != null) return connection;
        }

        if (provider == null) {
            MalformedURLException e =
                new MalformedURLException("Unsupported protocol: " + protocol);
            if (exception == null) {
                throw e;
            } else {
                throw EnvHelp.initCause(e, exception);
            }
        }

        envcopy = Collections.unmodifiableMap(envcopy);

        return provider.newJMXConnectorServer(serviceURL,
                                              envcopy,
                                              mbeanServer);
    }
}