com.bea.wli.sb.management.configuration

Interface SessionManagementMBean

public interface SessionManagementMBean

Provides API to create, activate or discard sessions.

The Concept of Session

OSB features the concept of a session which allows different users to update different parts of configuration data without interfering with each other. In order to modify resources and OSB configuration, the user must create a session, and perform changes in that session. The changes are only reflected to the core data (the data which OSB runs on) when the session is activated.

A session is essentially a named sandbox, which is used to isolate the changes from other users, as well as from the core data, until the changes are activated. A user can create as many sessions as he wishes, with arbitrary names, provided that no other session with the same name already exists.

Sessions and MBeans

A session can be created, and then discarded or activated using the SessionManagementMBean API. There is one instance of SessionManagementMBean in the whole domain.

Once a session is created, updates can be performed using only the instance of an MBean that works on that session data. Each MBean type, except for SessionManagementMBean, has one instance per session. When a session is created, a new set of MBean instances, one for each MBean Type, are created automatically. Furthermore there is one instance of each MBean Type for operating on core data. However operations on core data are limited to read only operations. For example, if there are 10 sessions, there will be 11 instance of ProxyServiceConfigurationMBean, 10 for operating on each session, and 1 for operating on the core data. The MBean instance that works on core data will not support update operations.

MBean instances are destroyed when a session is discarded or activated. MBean instances that operate on core data are never destroyed.

Using MBeans from a Java client

The following sample code shows how to obtain SessionManagementMBean for creating a session, and ALSBConfigurationMBean for operating on both the session that is created, and on core data.

Note: Never embed username/password in source code. The code below does so for clarity

import weblogic.management.mbeanservers.domainruntime.DomainRuntimeServiceMBean;
import weblogic.management.jmx.MBeanServerInvocationHandler;
import com.bea.wli.sb.management.configuration.ALSBConfigurationMBean;
import com.bea.wli.sb.management.configuration.SessionManagementMBean;

public class MBeanSample {

static public void main(String[] args) throws Exception {

  // get the jmx connector
  JMXConnector conn = initConnection("localhost", 7001, "weblogic", "weblogic");

  // get mbean connection
  MBeanServerConnection mbconn = conn.getMBeanServerConnection();

  // get domain service mbean. This is the topmost mbean
  DomainRuntimeServiceMBean domainService = (DomainRuntimeServiceMBean) MBeanServerInvocationHandler.
     newProxyInstance(mbconn, new ObjectName(DomainRuntimeServiceMBean.OBJECT_NAME));


  // obtain session management mbean to create a session.
  // This mbean instance can be used more than once to
  // create/discard/commit many sessions
  SessionManagementMBean sm = (SessionManagementMBean) domainService.
     findService(SessionManagementMBean.NAME,
                 SessionManagementMBean.TYPE, null);

  // create a session
  sm.createSession("mysession");

  // obtain the ALSBConfigurationMBean instance that operates on the session that has
  // just been created. Notice that the name of the mbean contains the session name.
  ALSBConfigurationMBean alsbSession = (ALSBConfigurationMBean) domainService.
     findService(ALSBConfigurationMBean.NAME + "." + "mysession",
                 ALSBConfigurationMBean.TYPE, null);

  // Perform updates or read operations in the session using alsbSession
  ...

  // activate changes performed in the session
  sm.activateSession("mysession", "description");


  // Obtain MBean for peforming read only operations. Notice that the name
  // of the mbean for the core data does not contain any session name.
  ALSBConfigurationMBean alsbCore =
     (ALSBConfigurationMBean) domainService.findService(ALSBConfigurationMBean.NAME,
                                                        ALSBConfigurationMBean.TYPE, null);


  // Perform read-only operations on core data using alsbCore
  ....

  conn.close();
}



public static JMXConnector initConnection(String hostname, int port,
                                          String username, String password)
   throws IOException,MalformedURLException
{
  JMXServiceURL serviceURL =
      new JMXServiceURL("t3", hostname, port,
                        "/jndi/" + DomainRuntimeServiceMBean.MBEANSERVER_JNDI_NAME);

  Hashtable<String, String> h = new Hashtable<String, String>();
  h.put(Context.SECURITY_PRINCIPAL, username);
  h.put(Context.SECURITY_CREDENTIALS, password);
  h.put(JMXConnectorFactory.PROTOCOL_PROVIDER_PACKAGES, "weblogic.management.remote");
  return JMXConnectorFactory.connect(serviceURL, h);
}

}

Using MBeans in a script

The management API provided by MBeans is available for scripting via WLST. The java client code presented above is reimplemented here using the following python script. To run this example simply save the code below in a file named basic.py and invoke it via the following command

java weblogic.WLST basic.py You must set the classpath and environment variables correctly by invoking the setDomainEnv.[cmd|sh] script in the bin directory of your domain.

import wlstModule
from com.bea.wli.sb.management.configuration import SessionManagementMBean
from com.bea.wli.sb.management.configuration import ALSBConfigurationMBean
from com.bea.wli.config import Ref


try:
    connect("weblogic", "weblogic", "t3://localhost:7001")
    domainRuntime()

    # obtain session management mbean to create a session.
    # This mbean instance can be used more than once to
    # create/discard/commit many sessions
    sessionMBean = findService(SessionManagementMBean.NAME,SessionManagementMBean.TYPE)

    # create a session
    sessionMBean.createSession("mysession")

    # obtain the ALSBConfigurationMBean instance that operates
    # on the session that has just been created. Notice that
    # the name of the mbean contains the session name.
    alsbSession = findService(ALSBConfigurationMBean.NAME + "." + "mysession", ALSBConfigurationMBean.TYPE)


    # Perform updates or read operations in the session using alsbSession
    ...


    # activate changes performed in the session
    sessionMBean.activateSession("mysession", "description for session activation")


    # Obtain MBean for peforming read only operations.
    # Notice that the name of the mbean for the core
    # data does not contain any session name.
    alsbCore = findService(ALSBConfigurationMBean.NAME, ALSBConfigurationMBean.TYPE)

    # Perform read-only operations on core data using alsbCore
    ...

except:
    print "Unexpected error: ", sys.exc_info()[0]
    dumpStack()
    raise

Field Summary

Fields

Modifier and Type	Field and Description
static String	NAME
static String	OBJECT_NAME
static String	TYPE

Method Summary

Modifier and Type	Method and Description
void	activateSession(String session, String description) Commits a session
void	createSession(String session) Creates a new session with an arbitrary user given name
void	discardSession(String session) Deletes the session without activating the changes.
boolean	sessionExists(String session) Returns true if a session with the given session exists

Field Detail

NAME

static final String NAME

See Also:

Constant Field Values

TYPE

static final String TYPE

OBJECT_NAME

static final String OBJECT_NAME

Method Detail

createSession

void createSession(String session)
            throws Exception

Creates a new session with an arbitrary user given name

Parameters:

session - the name of the session that will be created

Throws:

Exception

sessionExists

boolean sessionExists(String session)

Returns true if a session with the given session exists

Parameters:

session - the name of the session

discardSession

void discardSession(String session)
             throws Exception

Deletes the session without activating the changes.

Parameters:

session - the name of the session

Throws:

Exception

activateSession

void activateSession(String session,
                     String description)
              throws Exception

Commits a session

Parameters:

session - the name of the session

description - the description for this session activation

Throws:

Exception