Create custom Common Base Event factory homes

Use custom Common Base Event factory homes to control configuration and implementation of unique event factories.

Event factory homes create and provide homes for Event Factory instances. Each event factory home has a content handler. This content handler is assigned to every event factory the event factory home creates. In turn, when a Common Base Event is created, the content handler from the event factory is assigned to it. Event factory instances are maintained by the associated event factory home, based on their unique name. For example, when application code requests a named event factory, the newly created event factory instance is returned and persisted for future requests for that named event factory.

The following classes were added to facilitate the use of event eactory homes for logging Common Base Events:

Class name	Description
WsEventFactoryHomeImpl	This class extends the org.eclipse.hyades.logging.events.cbe.impl.AbstractEventFactoryHome class. This event factory home returns event factory instances associated with the WsContentHandlerImpl content handler. The WsContentHandlerImpl is the content handler used by the WebSphere Application Server by default when no event factory template is in use.
WsTemplateEventFactory HomeImpl	This class extends the org.eclipse.hyades.logging.events.cbe.impl.EventXMLFileEventFactoryHomeImpl class. This event factory home returns event factory instances associated with the WsTemplateContentHandlerImpl Content Handler. The WsTemplateContentHandlerImpl is the content handler used by the WAS when an Event Factory template is required.

Custom event factory homes support the use of Common Base Event for logging in WAS and make logging easy and consistent between the WAS runtime and the exploiters of this API. The CustomEventFactoryHome and CustomTemplateEventFactoryHome classes will be used to obtain an event factory. These classes are there to make sure the correct content handler is being used with a particular event factory. The CustomEventFactoryHelper class is an example of how the infrastructure provider can hide the factory selection details from infrastructure users, using their own set of parameters to decide which the appropriate event factory is.

• The following code samples provide examples of how to implement and use the CustomEventFactoryHome class.
  1. Implementation of the CustomEventFactoryHome class is as follows:

     public class CustomEventFactoryHome extends AbstractEventFactoryHome {
     
      public CustomEventFactoryHome() {
       super();
       // TODO Custom intialization code goes here
      }
     
      public ContentHandler createContentHandler(String arg0) {
       // Always use custom content handler   return resolveContentHandler();
      }
     
      public ContentHandler resolveContentHandler() {
       // Always use custom content handler   return new CustomContentHandler();
      }}

  2. The following is an example of how to use the CustomEventFactoryHome class:

     // get the event factory
       EventFactory eventFactory=(new CustomEventFactoryHome()).getEventFactory("XYZ");
       // create an event - call appropriate method   eventFactory.createCommonBaseEvent();
       // log event ...

• For the CustomTemplateEventFactoryHome class we can use the following code for implementation and use:
  1. Implement the CustomTemplateEventFactoryHome class using this code:

     public class CustomTemplateEventFactoryHome extends
       EventXMLFileEventFactoryHomeImpl {
     
      public CustomTemplateEventFactoryHome() {
       super();
       // TODO Custom intialization code goes here
      }
     
      public ContentHandler createContentHandler(String arg0) {
       // Always use custom content handler   return resolveContentHandler();
      }
     
      public ContentHandler resolveContentHandler() {
       // Always use custom content handler   return new CustomTemplateContentHandler();
      }}

  2. Use the CustomTemplateEventFactoryHome class by following this sample code:

     // get the event factory
       EventFactory eventFactory=(new 
         CustomTemplateEventFactoryHome()).getEventFactory("XYZ");
       // create an event - call appropriate method   eventFactory.createCommonBaseEvent();
       // log event ...

• The CustomEventFactoryHelper class can be implemented and used by following the code below:
  1. Implement the custom CustomEventFactoryHelper class using this code:

     public class CustomTemplateEventFactoryHome extends
       EventXMLFileEventFactoryHomeImpl {
     
      public CustomTemplateEventFactoryHome() {
       super();
       // TODO Custom intialization code goes here
      }
     
      public ContentHandler createContentHandler(String arg0) {
       // Always use custom content handler   return resolveContentHandler();
      }
     
      public ContentHandler resolveContentHandler() {
       // Always use custom content handler   return new CustomTemplateContentHandler();
      }}
     Figure 4    CustomTemplateEventFactoryHome class public class CustomEventFactoryHelper {
      // name of the event factory to use  public static final String FACTORY_NAME="XYZ";
     
      public static EventFactory getEventFactory(String param1, String param2) {
       EventFactory factory=null;
       switch (resolveFactory(param1,param2)) {
       case 1:
        factory=(new CustomEventFactoryHome()).getEventFactory(FACTORY_NAME);
        break;
       case 2:
        factory=(new 
         CustomTemplateEventFactoryHome()).getEventFactory(FACTORY_NAME);
        break;
      
       default:
        // Add default for event factory 
        break;
       }
       return factory;
      }
      
      private static int resolveFactory(String param1, String param2) {
       int factory=0;
       // Add code here to resolve which factory to use   return factory;
      }}

  2. To use the CustomEventFactoryHelper class, use the following code:

     // get the event factory
       EventFactory eventFactory=
        CustomEventFactoryHelper.getEventFactory("param1","param2","param3");
       // create an event - call appropriate method   eventFactory.createCommonBaseEvent();
       // log event ...

Results

Use the information provided here to implement a custom content factory home and the associated classes based on the settings specified.

Reference:

Common Base Event factory home

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