This document provides a tutorial on using Oracle's Event Delivery Network (EDN) and POProcessing to handle business events. It demonstrates modifying a POProcessing composite to consume events for new purchase orders (POs) from two sources. First, an event definition is created for a "NewPO" event using the POEvents.edl file. Then a "receiveNewPO" mediator is configured to subscribe to the NewPO event and pass received POs to the existing routing. The composite is deployed and tested by publishing sample XML for a new PO through the Enterprise Manager console and verifying a new instance is created. In summary, the tutorial illustrates how to declaratively define and consume business events in SOA using EDN without
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Event driven network
1. Tutorial: Use of Event Delivery Network (EDN)
and POProcessing
Let's try out a simple EDN use case. We will extend a POProcessing example.
In order to follow the tutorial in this article you must have installed the product and learned how
to use the WebLogic console to configure the JMS adapter and define queues and connection
factories.
To illustrate the usage of events, you modify the existing POProcessing composite to accept new orders from
two sources: the Web Service interface, which you have already implemented, and another application that will
publish events to indicate new orders.
Modifying the composite to consume events
In this step, you modify the POProcessing composite to use EDN. You add a new mediator component
called receivePO, which subscribes to an event called NewPO and sends the received PO to
the routePOservice.
Defining the event
1. Open the POProcessing application in JDeveloper and open composite.xml,and click on the Event
Definition Creation icon:
2. In the Event Definition Creationwindow, enter POEvents as the name of the event definition. Accept the
namespace value generated.
Event names are fully qualified names, which means the combination of a namespace and
the event name together identify a unique event. For instance, the event called
NewCustomerAdded with name space http://schemas.oracle.com/events/edl/POEvents is
different than the event with the same name but under a different namespace, for example,
event NewCustomerAdded with namespace
http://schemas.oracle.com/event/edl/CRMEvents.
3. Add a new event by clicking on the +icon.
4. Select the PuchaseOrder element from the po.xsd file using the chooser.
5. Enter NewPO as the name of the event and click on OK to close the Add an Eventwindow.
2. 6. Click on OK to complete the event definition.
7. Close the POEvents.edl panel.
8. Save all.
You have just created a new event called POEvent. It is now available to this and other
composites to subscribe to or publish. Whenever this event is delivered,it will also carry with it a
document for the new purchase order.
Subscribing to the NewPO event
1. Drag-and-drop a Mediator component on to the composite.
2. Name the mediator receiveNewPO.
3. Select Subscribe to Events for the Template.
4. Click on the + to add an event. Select the NewPO event from the Event Chooser window.
3. 5. Click on OK to accept and create the mediator.
6. Save all.
7. Connect the receiveNewPO mediator to the routePO mediator:
4. 8. Double-click on the receiveNewPO mediator and define a new transformation map. In the transformation-
map, map the all the fields from the source to the target.
9. Close the mediator and save all.
Deploying and testing
1. Deploy the POProcessing composite tothe server.
2. Browse to the EM console at http://localhost:7001/em.
3. Right-click on folder soa-infra (soa_server1)under folder SOA:
4. Click on item Business Events.
5. You should see the Business Events management page with the NewPO event listed in the Events
5. 6. Select the event and click on the Test…button to publish the event.
7. In the pop-up window, enter the following XML and click on Publish:
<PurchaseOrder xmlns="http://xmlns.oracle.com/ns/order">
<CustID>1111</CustID>
<ID>33412</ID>
<productName>Sony Bluray DVD Player</productName>
<itemType>Electronics</itemType>
<price>350</price>
<quantity>5</quantity>
<status>Initial</status>
<ccType>Mastercard</ccType>
<ccNumber>1234-1234-1234-1234</ccNumber>
</PurchaseOrder>
8. You should get a "The Event published successfully" message.
9. Click on soa-infra in the navigation panel on the left to get the soa-infra dashboard.
10. Click on the POProcessing composite to view new instances. You should see an instance created for
processing the event you just published. Click on the instance ID to view the flowtrace.
This was just one way of publishing an event and will typically be used as away to test the
composite. In most cases, the events will be published from a number of sources—from a
6. Mediator, from PL/SQL by calling the EDN_PUBLISH_EVENT stored function or from a Java
class using the EDNAPI. An ADF-BC application can also publish events based on database
insert, update, and delete operations.
Summary
You cannot really build comprehensive SOA applications without business events. Traditionally, this
requirement has been fulfilled by message-oriented-middleware(MOM). However, MOM-based solutions
don't necessarily fit very well within a service-oriented architecture. They are low-level technical solutions that
provide no business semantics, whereas one of the main objectives of creating services is to provide business
functions using semantics that are better understood by business analysts.
With EDN, Oracle SOA Suite 11g fills this gap by providing an event-handling solution that allows creation and
use of events using business semantics, without the publisher or subscriber of the event ever having to worry
about the mechanics of messaging.
As you have seen in this short lab, events are created in away that directly maps to actual business events, in
this case creation of a new purchase order. The process of subscribing to this event was done declaratively
without having to configure any messaging queues or topics.