Class JMXConnectorServer
- java.lang.Object
-
- javax.management.NotificationBroadcasterSupport
-
- javax.management.remote.JMXConnectorServer
- All Implemented Interfaces:
-
MBeanRegistration
,NotificationBroadcaster
,NotificationEmitter
,JMXAddressable
,JMXConnectorServerMBean
- Direct Known Subclasses:
RMIConnectorServer
public abstract class JMXConnectorServer extends NotificationBroadcasterSupport implements JMXConnectorServerMBean, MBeanRegistration, JMXAddressable
Superclass of every connector server. A connector server is attached to an MBean server. It listens for client connection requests and creates a connection for each one.
A connector server is associated with an MBean server either by registering it in that MBean server, or by passing the MBean server to its constructor.
A connector server is inactive when created. It only starts listening for client connections when the start
method is called. A connector server stops listening for client connections when the stop
method is called or when the connector server is unregistered from its MBean server.
Stopping a connector server does not unregister it from its MBean server. A connector server once stopped cannot be restarted.
Each time a client connection is made or broken, a notification of class JMXConnectionNotification
is emitted.
- Since:
- 1.5
Field Summary
Modifier and Type | Field | Description |
---|---|---|
static String | AUTHENTICATOR | Name of the attribute that specifies the authenticator for a connector server. |
Constructor Summary
Constructor | Description |
---|---|
JMXConnectorServer() | Constructs a connector server that will be registered as an MBean in the MBean server it is attached to. |
JMXConnectorServer(MBeanServer mbeanServer) | Constructs a connector server that is attached to the given MBean server. |
Method Summary
Modifier and Type | Method | 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. |
MBeanServer | getMBeanServer() | Returns the MBean server that this connector server is attached to. |
MBeanNotificationInfo[] | getNotificationInfo() | Returns an array indicating the notifications that this MBean sends. |
void | preDeregister() | Called by an MBean server when this connector server is unregistered from that MBean server. |
ObjectName | preRegister(MBeanServer mbs,
ObjectName name) | Called by an MBean server when this connector server is registered in that MBean server. |
JMXConnector | toJMXConnector(Map<String,?> env) | Returns a client stub for this connector server. |
Methods declared in class javax.management.NotificationBroadcasterSupport
addNotificationListener, handleNotification, sendNotification
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods declared in interface javax.management.remote.JMXAddressable
getAddress
Methods declared in interface javax.management.remote.JMXConnectorServerMBean
getAddress, getAttributes, getConnectionIds, isActive, setMBeanServerForwarder, start, stop
Methods declared in interface javax.management.MBeanRegistration
postDeregister, postRegister
Methods declared in interface javax.management.NotificationBroadcaster
removeNotificationListener
Methods declared in interface javax.management.NotificationEmitter
removeNotificationListener
Field Detail
AUTHENTICATOR
public static final String AUTHENTICATOR
Name of the attribute that specifies the authenticator for a connector server. The value associated with this attribute, if any, must be an object that implements the interface JMXAuthenticator
.
- See Also:
- Constant Field Values
Constructor Detail
JMXConnectorServer
public JMXConnectorServer()
Constructs a connector server that will be registered as an MBean in the MBean server it is attached to. This constructor is typically called by one of the createMBean
methods when creating, within an MBean server, a connector server that makes it available remotely.
JMXConnectorServer
public JMXConnectorServer(MBeanServer mbeanServer)
Constructs a connector server that is attached to the given MBean server. A connector server that is created in this way can be registered in a different MBean server, or not registered in any MBean server.
- Parameters:
-
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.
Method Detail
getMBeanServer
public MBeanServer getMBeanServer()
Returns the MBean server that this connector server is attached to.
- Returns:
- the MBean server that this connector server is attached to, or null if it is not yet attached to an MBean server.
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.
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).
The default implementation of this method uses JMXConnectorServerMBean.getAddress()
and JMXConnectorFactory
to generate the stub, with code equivalent to the following:
JMXServiceURL addr = getAddress(); return JMXConnectorFactory.newJMXConnector(addr, env);
A connector server for which this is inappropriate must override this method so that it either implements the appropriate logic or throws UnsupportedOperationException
.
- Specified by:
-
toJMXConnector
in interfaceJMXConnectorServerMBean
- Parameters:
-
env
- client connection parameters of the same sort that could be provided toJMXConnector.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 (seeJMXConnectorServerMBean.isActive()
). -
IOException
- if a communications problem means that a stub cannot be created.
getNotificationInfo
public MBeanNotificationInfo[] getNotificationInfo()
Returns an array indicating the notifications that this MBean sends. The implementation in JMXConnectorServer
returns an array with one element, indicating that it can emit notifications of class JMXConnectionNotification
with the types defined in that class. A subclass that can emit other notifications should return an array that contains this element plus descriptions of the other notifications.
- Specified by:
-
getNotificationInfo
in interfaceNotificationBroadcaster
- Returns:
- the array of possible notifications.
connectionOpened
protected void connectionOpened(String connectionId, String message, Object userData)
Called by a subclass when a new client connection is opened. Adds connectionId
to the list returned by JMXConnectorServerMBean.getConnectionIds()
, then emits a JMXConnectionNotification
with type JMXConnectionNotification.OPENED
.
- 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 emittedJMXConnectionNotification
. Can be null. SeeNotification.getMessage()
. -
userData
- theuserData
for the emittedJMXConnectionNotification
. Can be null. SeeNotification.getUserData()
. - Throws:
-
NullPointerException
- ifconnectionId
is null.
connectionClosed
protected void connectionClosed(String connectionId, String message, Object userData)
Called by a subclass when a client connection is closed normally. Removes connectionId
from the list returned by JMXConnectorServerMBean.getConnectionIds()
, then emits a JMXConnectionNotification
with type JMXConnectionNotification.CLOSED
.
- Parameters:
-
connectionId
- the ID of the closed connection. -
message
- the message for the emittedJMXConnectionNotification
. Can be null. SeeNotification.getMessage()
. -
userData
- theuserData
for the emittedJMXConnectionNotification
. Can be null. SeeNotification.getUserData()
. - Throws:
-
NullPointerException
- ifconnectionId
is null.
connectionFailed
protected void connectionFailed(String connectionId, String message, Object userData)
Called by a subclass when a client connection fails. Removes connectionId
from the list returned by JMXConnectorServerMBean.getConnectionIds()
, then emits a JMXConnectionNotification
with type JMXConnectionNotification.FAILED
.
- Parameters:
-
connectionId
- the ID of the failed connection. -
message
- the message for the emittedJMXConnectionNotification
. Can be null. SeeNotification.getMessage()
. -
userData
- theuserData
for the emittedJMXConnectionNotification
. Can be null. SeeNotification.getUserData()
. - Throws:
-
NullPointerException
- ifconnectionId
is null.
preRegister
public ObjectName preRegister(MBeanServer mbs, ObjectName name)
Called by an MBean server when this connector server is registered in that MBean server. This connector server becomes attached to the MBean server and its getMBeanServer()
method will return mbs
.
If this connector server is already attached to an MBean server, this method has no effect. The MBean server it is attached to is not necessarily the one it is being registered in.
- Specified by:
-
preRegister
in interfaceMBeanRegistration
- Parameters:
-
mbs
- the MBean server in which this connection server is being registered. -
name
- The object name of the MBean. - Returns:
- The name under which the MBean is to be registered.
- Throws:
-
NullPointerException
- ifmbs
orname
is null.
preDeregister
public void preDeregister() throws Exception
Called by an MBean server when this connector server is unregistered from that MBean server. If this connector server was attached to that MBean server by being registered in it, and if the connector server is still active, then unregistering it will call the stop
method. If the stop
method throws an exception, the unregistration attempt will fail. It is recommended to call the stop
method explicitly before unregistering the MBean.
- Specified by:
-
preDeregister
in interfaceMBeanRegistration
- Throws:
-
IOException
- if thrown by thestop
method. -
Exception
- This exception will be caught by the MBean server and re-thrown as anMBeanRegistrationException
.