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package javax.management.remote;

import java.io.IOException;
import java.util.Map;


MBean interface for connector servers.  A JMX API connector server
is attached to an MBean server, and establishes connections to that
MBean server for remote clients.


A newly-created connector server is inactive, and does not yet listen for connections. Only when its start method has been called does it start listening for connections.


Since:1.5
/**
 * <p>MBean interface for connector servers.  A JMX API connector server
 * is attached to an MBean server, and establishes connections to that
 * MBean server for remote clients.</p>
 *
 * <p>A newly-created connector server is <em>inactive</em>, and does
 * not yet listen for connections.  Only when its {@link #start start}
 * method has been called does it start listening for connections.</p>
 *
 * @since 1.5
 */
public interface JMXConnectorServerMBean {
    
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.


Throws:
  • IOException – if it is not possible to start listening
or if the connector server has been stopped.
  • IllegalStateException – if the connector server has
not been attached to an MBean server.
/**
     * <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
     * {@link IOException}.</p>
     *
     * @exception IOException if it is not possible to start listening
     * or if the connector server has been stopped.
     *
     * @exception IllegalStateException if the connector server has
     * not been attached to an MBean server.
     */
    public void start() throws IOException;

    
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 with type JMXConnectionNotification.FAILED 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.


Throws:
  • IOException – if the server cannot be closed cleanly.
When this exception is thrown, the server has already attempted
to close all client connections.  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} with type {@link
     * JMXConnectionNotification#FAILED} 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>
     *
     * @exception IOException if the server cannot be closed cleanly.
     * When this exception is thrown, the server has already attempted
     * to close all client connections.  All client connections are
     * closed except possibly those that generated exceptions when the
     * server attempted to close them.
     */
    public void stop() throws IOException;

    
Determines whether the connector server is active. A connector server starts being active when its start method returns successfully and remains active until either its stop method is called or the connector server fails.


Returns:true if the connector server is active.
/**
     * <p>Determines whether the connector server is active.  A connector
     * server starts being active when its {@link #start start} method
     * returns successfully and remains active until either its
     * {@link #stop stop} method is called or the connector server
     * fails.</p>
     *
     * @return true if the connector server is active.
     */
    public boolean isActive();

    
Adds an object that intercepts requests for the MBean server
that arrive through this connector server.  This object will be
supplied as the MBeanServer for any new connection
created by this connector server.  Existing connections are
unaffected.


If this connector server is already associated with an
MBeanServer object, then that object is given to 
mbsf.setMBeanServer. If doing so produces an exception, this method throws the same exception without any other effect.


If this connector is not already associated with an
MBeanServer object, or if the
mbsf.setMBeanServer call just mentioned succeeds,
then mbsf becomes this connector server's
MBeanServer.


Params:
  • mbsf – the new MBeanServerForwarder.
Throws:
/**
     * <p>Adds an object that intercepts requests for the MBean server
     * that arrive through this connector server.  This object will be
     * supplied as the <code>MBeanServer</code> for any new connection
     * created by this connector server.  Existing connections are
     * unaffected.</p>
     *
     * <p>If this connector server is already associated with an
     * <code>MBeanServer</code> object, then that object is given to
     * {@link MBeanServerForwarder#setMBeanServer
     * mbsf.setMBeanServer}.  If doing so produces an exception, this
     * method throws the same exception without any other effect.</p>
     *
     * <p>If this connector is not already associated with an
     * <code>MBeanServer</code> object, or if the
     * <code>mbsf.setMBeanServer</code> call just mentioned succeeds,
     * then <code>mbsf</code> becomes this connector server's
     * <code>MBeanServer</code>.</p>
     *
     * @param mbsf the new <code>MBeanServerForwarder</code>.
     *
     * @exception IllegalArgumentException if the call to {@link
     * MBeanServerForwarder#setMBeanServer mbsf.setMBeanServer} fails
     * with <code>IllegalArgumentException</code>.  This includes the
     * case where <code>mbsf</code> is null.
     */
    public void setMBeanServerForwarder(MBeanServerForwarder mbsf);

    
The list of IDs for currently-open connections to this
connector server.


Returns:a new string array containing the list of IDs.  If
there are no currently-open connections, this array will be
empty.
/**
     * <p>The list of IDs for currently-open connections to this
     * connector server.</p>
     *
     * @return a new string array containing the list of IDs.  If
     * there are no currently-open connections, this array will be
     * empty.
     */
    public String[] getConnectionIds();

    
The address of this connector server.


 The address returned may not be the exact original JMXServiceURL that was supplied when creating the connector server, since the original address may not always be complete. For example the port number may be dynamically allocated when starting the connector server. Instead the address returned is the actual JMXServiceURL of the JMXConnectorServer. This is the address that clients supply to JMXConnectorFactory.connect(JMXServiceURL). 


Note that the address returned may be null if the JMXConnectorServer is not yet active. 


Returns:the address of this connector server, or null if it
does not have one.
/**
     * <p>The address of this connector server.</p>
     * <p>
     * The address returned may not be the exact original {@link JMXServiceURL}
     * that was supplied when creating the connector server, since the original
     * address may not always be complete. For example the port number may be
     * dynamically allocated when starting the connector server. Instead the
     * address returned is the actual {@link JMXServiceURL} of the
     * {@link JMXConnectorServer}. This is the address that clients supply
     * to {@link JMXConnectorFactory#connect(JMXServiceURL)}.
     * </p>
     * <p>Note that the address returned may be {@code null} if
     *    the {@code JMXConnectorServer} is not yet {@link #isActive active}.
     * </p>
     *
     * @return the address of this connector server, or null if it
     * does not have one.
     */
    public JMXServiceURL getAddress();

    
The attributes for this connector server.


Returns:a read-only map containing the attributes for this
connector server.  Attributes whose values are not serializable
are omitted from this map.  If there are no serializable
attributes, the returned map is empty.
/**
     * <p>The attributes for this connector server.</p>
     *
     * @return a read-only map containing the attributes for this
     * connector server.  Attributes whose values are not serializable
     * are omitted from this map.  If there are no serializable
     * attributes, the returned map is empty.
     */
    public Map<String,?> getAttributes();

    
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.


A given connector need not support the generation of client
stubs.  However, the connectors specified by the JMX Remote API do
(JMXMP Connector and RMI Connector).


Params:
  • env – client connection parameters of the same sort that can 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>
     *
     * <p>A given connector need not support the generation of client
     * stubs.  However, the connectors specified by the JMX Remote API do
     * (JMXMP Connector and RMI Connector).</p>
     *
     * @param env client connection parameters of the same sort that
     * can 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 JMXConnectorServerMBean#isActive()}).
     *
     * @exception IOException if a communications problem means that a
     * stub cannot be created.
     *
     */
    public JMXConnector toJMXConnector(Map<String,?> env)
        throws IOException;
}