Class RMIConnectorServer

All Implemented Interfaces:
MBeanRegistration, NotificationBroadcaster, NotificationEmitter, JMXAddressable, JMXConnectorServerMBean 

public class RMIConnectorServer
extends JMXConnectorServer

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

Fields

Modifier and Type Field and Description
static String JNDI_REBIND_ATTRIBUTE

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.
static String RMI_CLIENT_SOCKET_FACTORY_ATTRIBUTE

Name of the attribute that specifies the RMIClientSocketFactory for the RMI objects created in conjunction with this connector.
static String RMI_SERVER_SOCKET_FACTORY_ATTRIBUTE

Name of the attribute that specifies the RMIServerSocketFactory for the RMI objects created in conjunction with this connector.

Fields inherited from class javax.management.remote.JMXConnectorServer

AUTHENTICATOR

Constructors

Constructor and Description
RMIConnectorServer(JMXServiceURL url, Map<String,?> environment)

Makes an RMIConnectorServer.
RMIConnectorServer(JMXServiceURL url, Map<String,?> environment, MBeanServer mbeanServer)

Makes an RMIConnectorServer for the given MBean server.
RMIConnectorServer(JMXServiceURL url, Map<String,?> environment, RMIServerImpl rmiServerImpl, MBeanServer mbeanServer)

Makes an RMIConnectorServer for the given MBean server.

Methods

Modifier and Type Method and Description
protected void connectionClosed(String connectionId, String message, Object userData)

Called by a subclass when a client connection is closed normally.
protected void connectionFailed(String connectionId, String message, Object userData)

Called by a subclass when a client connection fails.
protected void connectionOpened(String connectionId, String message, Object userData)

Called by a subclass when a new client connection is opened.
JMXServiceURL getAddress()

The address of this connector server.
Map<String,?> getAttributes()

The attributes for this connector server.
boolean isActive()

Determines whether the connector server is active.
void setMBeanServerForwarder(MBeanServerForwarder mbsf)

Inserts an object that intercepts requests for the MBean server that arrive through this connector server.
void start()

Activates the connector server, that is starts listening for client connections.
void stop()

Deactivates the connector server, that is, stops listening for client connections.
JMXConnector toJMXConnector(Map<String,?> env)

Returns a client stub for this connector server.

Methods inherited from class javax.management.remote.JMXConnectorServer

getConnectionIds, getMBeanServer, getNotificationInfo, postDeregister, postRegister, preDeregister, preRegister

Methods inherited from class javax.management.NotificationBroadcasterSupport

addNotificationListener, handleNotification, removeNotificationListener, removeNotificationListener, sendNotification

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Fields

JNDI_REBIND_ATTRIBUTE

public static final String JNDI_REBIND_ATTRIBUTE

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.

See Also:
Constant Field Values

RMI_CLIENT_SOCKET_FACTORY_ATTRIBUTE

public static final String RMI_CLIENT_SOCKET_FACTORY_ATTRIBUTE

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.

See Also:
Constant Field Values

RMI_SERVER_SOCKET_FACTORY_ATTRIBUTE

public static final String RMI_SERVER_SOCKET_FACTORY_ATTRIBUTE

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.

See Also:
Constant Field Values

Constructors

RMIConnectorServer

public RMIConnectorServer(JMXServiceURL url,
                          Map<String,?> environment)
                   throws IOException

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

Parameters:
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" and "iiop" are 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.

RMIConnectorServer

public RMIConnectorServer(JMXServiceURL url,
                          Map<String,?> environment,
                          MBeanServer mbeanServer)
                   throws IOException

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

Parameters:
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" and "iiop" are 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.

RMIConnectorServer

public RMIConnectorServer(JMXServiceURL url,
                          Map<String,?> environment,
                          RMIServerImpl rmiServerImpl,
                          MBeanServer mbeanServer)
                   throws IOException

Makes an RMIConnectorServer for the given MBean server.

Parameters:
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" and "iiop" 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" and "iiop" are 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:
start()

Methods

toJMXConnector

public JMXConnector toJMXConnector(Map<String,?> env)
                            throws IOException

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.

Specified by:
toJMXConnector in interface JMXConnectorServerMBean
Overrides:
toJMXConnector in class JMXConnectorServer
Parameters:
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.
Returns:
a client stub that can be used to make a new connection to this connector server.
Throws:
UnsupportedOperationException - if this connector server does not support the generation of client stubs.
IllegalStateException - if the JMXConnectorServer is not started (see isActive()).
IOException - if a communications problem means that a stub cannot be created.

start

public void start()
           throws IOException

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 protocol part of the JMXServiceURL supplied to the constructor was iiop, an object of type RMIIIOPServerImpl is created.
  • 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 javax.management.remote.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 and iiop are described in the package documentation for javax.management.remote.rmi.

The behavior when the URL path is neither empty nor a JNDI directory URL, or when the protocol is neither rmi nor iiop, is implementation defined, and may include throwing MalformedURLException when the connector server is created or when it is started.

Throws:
IllegalStateException - if the connector server has not been attached to an MBean server.
IOException - if the connector server cannot be started, or in the case of the iiop protocol, that RMI/IIOP is not supported.

stop

public void stop()
          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 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.

isActive

public boolean isActive()

Description copied from interface: JMXConnectorServerMBean

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.

getAddress

public JMXServiceURL getAddress()

Description copied from interface: JMXConnectorServerMBean

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.

getAttributes

public Map<String,?> getAttributes()

Description copied from interface: JMXConnectorServerMBean

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.

setMBeanServerForwarder

public void setMBeanServerForwarder(MBeanServerForwarder mbsf)

Description copied from interface: JMXConnectorServerMBean

Inserts 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.

This method can be called more than once with different MBeanServerForwarder objects. The result is a chain of forwarders. The last forwarder added is the first in the chain. In more detail:

  • 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.

Specified by:
setMBeanServerForwarder in interface JMXConnectorServerMBean
Overrides:
setMBeanServerForwarder in class JMXConnectorServer
Parameters:
mbsf - the new MBeanServerForwarder.

connectionOpened

protected void connectionOpened(String connectionId,
                                String message,
                                Object userData)

Description copied from class: JMXConnectorServer

Called by a subclass when a new client connection is opened. Adds connectionId to the list returned by JMXConnectorServer.getConnectionIds(), then emits a JMXConnectionNotification with type JMXConnectionNotification.OPENED.

Overrides:
connectionOpened in class JMXConnectorServer
Parameters:
connectionId - the ID of the new connection. This must be different from the ID of any connection previously opened by this connector server.
message - the message for the emitted JMXConnectionNotification. Can be null. See Notification.getMessage().
userData - the userData for the emitted JMXConnectionNotification. Can be null. See Notification.getUserData().

connectionClosed

protected void connectionClosed(String connectionId,
                                String message,
                                Object userData)

Description copied from class: JMXConnectorServer

Called by a subclass when a client connection is closed normally. Removes connectionId from the list returned by JMXConnectorServer.getConnectionIds(), then emits a JMXConnectionNotification with type JMXConnectionNotification.CLOSED.

Overrides:
connectionClosed in class JMXConnectorServer
Parameters:
connectionId - the ID of the closed connection.
message - the message for the emitted JMXConnectionNotification. Can be null. See Notification.getMessage().
userData - the userData for the emitted JMXConnectionNotification. Can be null. See Notification.getUserData().

connectionFailed

protected void connectionFailed(String connectionId,
                                String message,
                                Object userData)

Description copied from class: JMXConnectorServer

Called by a subclass when a client connection fails. Removes connectionId from the list returned by JMXConnectorServer.getConnectionIds(), then emits a JMXConnectionNotification with type JMXConnectionNotification.FAILED.

Overrides:
connectionFailed in class JMXConnectorServer
Parameters:
connectionId - the ID of the failed connection.
message - the message for the emitted JMXConnectionNotification. Can be null. See Notification.getMessage().
userData - the userData for the emitted JMXConnectionNotification. Can be null. See Notification.getUserData().

© 1993, 2020, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
https://docs.oracle.com/javase/8/docs/api/javax/management/remote/rmi/RMIConnectorServer.html