/*
* @(#)JMXConnector.java 1.32 05/11/17
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.management.remote;
import java.io.Closeable;
import java.io.IOException;
import java.util.Map;
import javax.management.ListenerNotFoundException;
import javax.management.MBeanServerConnection;
import javax.management.NotificationFilter;
import javax.management.NotificationListener;
import javax.security.auth.Subject;
/**
* <p>The client end of a JMX API connector. An object of this type can
* be used to establish a connection to a connector server.</p>
*
* <p>A newly-created object of this type is unconnected. Its {@link
* #connect connect} method must be called before it can be used.
* However, objects created by {@link
* JMXConnectorFactory#connect(JMXServiceURL, Map)
* JMXConnectorFactory.connect} are already connected.</p>
*
* @since 1.5
* @since.unbundled 1.0
*/
public interface JMXConnector extends Closeable {
/**
* <p>Name of the attribute that specifies the credentials to send
* to the connector server during connection. The value
* associated with this attribute, if any, is a serializable
* object of an appropriate type for the server's {@link
* JMXAuthenticator}.
*/
public static final String CREDENTIALS =
"jmx.remote.credentials";
/**
* <p>Establishes the connection to the connector server. This
* method is equivalent to {@link #connect(Map)
* connect(null)}.</p>
*
* @exception IOException if the connection could not be made
* because of a communication problem.
*
* @exception SecurityException if the connection could not be
* made for security reasons.
*/
public void connect() throws IOException;
/**
* <p>Establishes the connection to the connector server.</p>
*
* <p>If <code>connect</code> has already been called successfully
* on this object, calling it again has no effect. If, however,
* {@link #close} was called after <code>connect</code>, the new
* <code>connect</code> will throw an <code>IOException</code>.<p>
*
* <p>Otherwise, either <code>connect</code> has never been called
* on this object, or it has been called but produced an
* exception. Then calling <code>connect</code> will attempt to
* establish a connection to the connector server.</p>
*
* @param env the properties of the connection. Properties in
* this map override properties in the map specified when the
* <code>JMXConnector</code> was created, if any. This parameter
* can be null, which is equivalent to an empty map.
*
* @exception IOException if the connection could not be made
* because of a communication problem.
*
* @exception SecurityException if the connection could not be
* made for security reasons.
*/
public void connect(Map<String,?> env) throws IOException;
/**
* <p>Returns an <code>MBeanServerConnection</code> object
* representing a remote MBean server. For a given
* <code>JMXConnector</code>, two successful calls to this method
* will usually return the same <code>MBeanServerConnection</code>
* object, though this is not required.</p>
*
* <p>For each method in the returned
* <code>MBeanServerConnection</code>, calling the method causes
* the corresponding method to be called in the remote MBean
* server. The value returned by the MBean server method is the
* value returned to the client. If the MBean server method
* produces an <code>Exception</code>, the same
* <code>Exception</code> is seen by the client. If the MBean
* server method, or the attempt to call it, produces an
* <code>Error</code>, the <code>Error</code> is wrapped in a
* {@link JMXServerErrorException}, which is seen by the
* client.</p>
*
* <p>Calling this method is equivalent to calling
* {@link #getMBeanServerConnection(Subject) getMBeanServerConnection(null)}
* meaning that no delegation subject is specified and that all the
* operations called on the <code>MBeanServerConnection</code> must
* use the authenticated subject, if any.</p>
*
* @return an object that implements the
* <code>MBeanServerConnection</code> interface by forwarding its
* methods to the remote MBean server.
*
* @exception IOException if a valid
* <code>MBeanServerConnection</code> cannot be created, for
* instance because the connection to the remote MBean server has
* not yet been established (with the {@link #connect(Map)
* connect} method), or it has been closed, or it has broken.
*/
public MBeanServerConnection getMBeanServerConnection()
throws IOException;
/**
* <p>Returns an <code>MBeanServerConnection</code> object representing
* a remote MBean server on which operations are performed on behalf of
* the supplied delegation subject. For a given <code>JMXConnector</code>
* and <code>Subject</code>, two successful calls to this method will
* usually return the same <code>MBeanServerConnection</code> object,
* though this is not required.</p>
*
* <p>For each method in the returned
* <code>MBeanServerConnection</code>, calling the method causes
* the corresponding method to be called in the remote MBean
* server on behalf of the given delegation subject instead of the
* authenticated subject. The value returned by the MBean server
* method is the value returned to the client. If the MBean server
* method produces an <code>Exception</code>, the same
* <code>Exception</code> is seen by the client. If the MBean
* server method, or the attempt to call it, produces an
* <code>Error</code>, the <code>Error</code> is wrapped in a
* {@link JMXServerErrorException}, which is seen by the
* client.</p>
*
* @param delegationSubject the <code>Subject</code> on behalf of
* which requests will be performed. Can be null, in which case
* requests will be performed on behalf of the authenticated
* Subject, if any.
*
* @return an object that implements the <code>MBeanServerConnection</code>
* interface by forwarding its methods to the remote MBean server on behalf
* of a given delegation subject.
*
* @exception IOException if a valid <code>MBeanServerConnection</code>
* cannot be created, for instance because the connection to the remote
* MBean server has not yet been established (with the {@link #connect(Map)
* connect} method), or it has been closed, or it has broken.
*/
public MBeanServerConnection getMBeanServerConnection(
Subject delegationSubject)
throws IOException;
/**
* <p>Closes the client connection to its server. Any ongoing or new
* request using the MBeanServerConnection returned by {@link
* #getMBeanServerConnection()} will get an
* <code>IOException</code>.</p>
*
* <p>If <code>close</code> has already been called successfully
* on this object, calling it again has no effect. If
* <code>close</code> has never been called, or if it was called
* but produced an exception, an attempt will be made to close the
* connection. This attempt can succeed, in which case
* <code>close</code> will return normally, or it can generate an
* exception.</p>
*
* <p>Closing a connection is a potentially slow operation. For
* example, if the server 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 connection cannot be closed
* cleanly. If this exception is thrown, it is not known whether
* the server end of the connection has been cleanly closed.
*/
public void close() throws IOException;
/**
* <p>Adds a listener to be informed of changes in connection
* status. The listener will receive notifications of type {@link
* JMXConnectionNotification}. An implementation can send other
* types of notifications too.</p>
*
* <p>Any number of listeners can be added with this method. The
* same listener can be added more than once with the same or
* different values for the filter and handback. There is no
* special treatment of a duplicate entry. For example, if a
* listener is registered twice with no filter, then its
* <code>handleNotification</code> method will be called twice for
* each notification.</p>
*
* @param listener a listener to receive connection status
* notifications.
* @param filter a filter to select which notifications are to be
* delivered to the listener, or null if all notifications are to
* be delivered.
* @param handback an object to be given to the listener along
* with each notification. Can be null.
*
* @exception NullPointerException if <code>listener</code> is
* null.
*
* @see #removeConnectionNotificationListener
* @see javax.management.NotificationBroadcaster#addNotificationListener
*/
public void
addConnectionNotificationListener(NotificationListener listener,
NotificationFilter filter,
Object handback);
/**
* <p>Removes a listener from the list to be informed of changes
* in status. The listener must previously have been added. If
* there is more than one matching listener, all are removed.</p>
*
* @param listener a listener to receive connection status
* notifications.
*
* @exception NullPointerException if <code>listener</code> is
* null.
*
* @exception ListenerNotFoundException if the listener is not
* registered with this <code>JMXConnector</code>.
*
* @see #removeConnectionNotificationListener(NotificationListener,
* NotificationFilter, Object)
* @see #addConnectionNotificationListener
* @see javax.management.NotificationEmitter#removeNotificationListener
*/
public void
removeConnectionNotificationListener(NotificationListener listener)
throws ListenerNotFoundException;
/**
* <p>Removes a listener from the list to be informed of changes
* in status. The listener must previously have been added with
* the same three parameters. If there is more than one matching
* listener, only one is removed.</p>
*
* @param l a listener to receive connection status notifications.
* @param f a filter to select which notifications are to be
* delivered to the listener. Can be null.
* @param handback an object to be given to the listener along
* with each notification. Can be null.
*
* @exception ListenerNotFoundException if the listener is not
* registered with this <code>JMXConnector</code>, or is not
* registered with the given filter and handback.
*
* @see #removeConnectionNotificationListener(NotificationListener)
* @see #addConnectionNotificationListener
* @see javax.management.NotificationEmitter#removeNotificationListener
*/
public void removeConnectionNotificationListener(NotificationListener l,
NotificationFilter f,
Object handback)
throws ListenerNotFoundException;
/**
* <p>Gets this connection's ID from the connector server. For a
* given connector server, every connection will have a unique id
* which does not change during the lifetime of the
* connection.</p>
*
* @return the unique ID of this connection. This is the same as
* the ID that the connector server includes in its {@link
* JMXConnectionNotification}s. The {@link
* javax.management.remote package description} describes the
* conventions for connection IDs.
*
* @exception IOException if the connection ID cannot be obtained,
* for instance because the connection is closed or broken.
*/
public String getConnectionId() throws IOException;
}
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