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Delete a module through programming


We can delete a module from an existing application through the admin console, wsadmin, or programming. Use this example to delete a module through programming.

This task assumes a basic familiarity with MBean programming. For information on MBean programming, see MBean Java API documentation. In this information center, click Reference > Mbean interfaces.

Before we can delete a module from an application on WAS, install the application.

Perform the following tasks to delete a module through programming.

 

  1. Connect to WAS.

  2. Create the application management proxy.

  3. Create the notification filter for listening to events.

  4. Add the listener.

  5. Delete the module.

  6. Wait for some timeout so that the program does not end.

  7. Listen to Java Management Extensions (JMX) notifications to understand completion of the operation.

  8. When the module is deleted, remove the listener and quit.

 

Results

After you successfully run the code, the existing module is deleted from the application.

 

Example

The following example shows how to delete a module from an application based on the previous steps. Some statements are split on multiple lines for printing purposes.


//moduleURI specifies a URI that gives the target location of the module.

//appName specifies the name of the application to update. 

String moduleURI = "Increment.jar";
 String appName = "MyApp";


//Get the admin client to connect to WAS. 
AdminClient client = ...;


//Create the application management proxy.
AppManagement proxy = AppManagementProxy. getJMXProxyForClient (client);


//Create the notification filter.
  NotificationFilterSupport myFilter = new NotificationFilterSupport();
  myFilter.enableType (NotificationConstants.TYPE_APPMANAGEMENT);

  
//Add the listener.
  NotificationListener listener = new AListener(_soapClient, myFilter, 
"Install: " + appName, AppNotification.UPDATE);


//Update the existing application, MyApp, by deleting the module. 
Hashtable options = new Hashtable();
 options.put (AppConstants.APPDEPL_LOCALE, Locale.getDefault());
 options.put (AppConstants.APPUPDATE_CONTENTTYPE, AppConstants.APPUPDATE_CONTENT_MODULEFILE);
 proxy.updateApplication (  appName, 
        moduleURI, 
        null,         AppConstants.APPUPDATE_DELETE,         options,         null);


// Wait; the installation API is 

// asynchronous and so returns immediately. 

// If the program does not wait here, the program ends.

Thread.sleep(300000); 


// Wait so that the program does not end.
        }
        catch (Exception e) {
            e.printStackTrace();
        }

    }

}

// Specify the Java Management Extensions (JMX) notification listener for JMX events. 

class AListener implements NotificationListener
{
    AdminClient _soapClient;
    NotificationFilterSupport  myFilter;
    Object handback;
    ObjectName on;
    String eventTypeToCheck;

    public AListener(AdminClient cl, NotificationFilterSupport fl,  Object h, String eType) throws Exception
    {
        _soapClient = cl;
        myFilter = fl;
        handback = h;
        eventTypeToCheck = eType;

        Iterator iter = _soapClient.queryNames (new ObjectName(
"WebSphere:type=AppManagement,*"), null).iterator();
        on = (ObjectName)iter.next();
        System.out.println ("ObjectName: " + on);
        _soapClient.addNotificationListener (on, this, myFilter, handback);
    }

    public void handleNotification (Notification notf, Object handback)
    {
            AppNotification ev = (AppNotification) notf.getUserData();
            System.out.println ("!! JMX event Recd: (handback obj= " + handback+ "): " + ev);


            
//When the installation is done, remove the listener and quit

            if (ev.taskName.equals (eventTypeToCheck) &&
                (ev.taskStatus.equals (AppNotification.STATUS_COMPLETED) ||
                 ev.taskStatus.equals (AppNotification.STATUS_FAILED)))
            {
                    try
                    {
                            _soapClient.removeNotificationListener (on, this);
                    }
            catch (Throwable th)
                    {
                        System.out.println ("Error removing listener: " + th);
                    }
                    System.exit (0);
        }
    }
}

 

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Add a file through programming
Updating a file through programming
Delete a file through programming