Expose RAP Business Event in SAP BTP ABAP Environment

Now create the event binding for your newly created business event. This event binding is needed to map an event to a RAP entity event.

1. Right-click on your package and create an event binding

- Name: `ZEVENT_EXPOSURE_###`
- Description: `RAP business event`

3. Here fill all fields out, to get errors gone. You can freely choose these names to specify your event with some considerations explained below

- Namespace: `zevent###` (No camel case and no space)
- Business Object: `OnlineShop` (No Space)
- Business Object Operation: `create`

4. Click Add to add items.

- Root Entity Name: `ZR_ONLINE_SHOP_###` (your behavior definition)
- Entity Event Name: `ITEMISORDERED` (Event name in your behavior definition)

5. Save and activate your event binding.

6. As you can see at the screenshot, Type (aka topic) is a concatenation of the three attributes (name space, business object, business object operation) and ends with the version of the event. The wildcard * points to the corresponding event e.g. created. This is relevant for addressing the events to the Event Mesh. Copy this address for later use zevent###.OnlineShop.create.v*.

After an event is raised, it should arrive at the Event Mesh to be consumed later. The connection between the system and the SAP Integration Suite Event Mesh is achieved through a channel. For this, you need to create a communication arrangement in your cloud system with sap_com_0092 scenario which is built for an event enablement and also an Event Mesh instance’s service key.

One requirement is that you have an existing SAP Integration Suite Event Mesh service instance. You can create an instance of SAP Integration Suite Event Mesh provided that you already subscribe to the Integration Suite Event Mesh capability.

For more information about how to create instance of SAP Event Mesh [link] (https://developers.sap.com/tutorials/cp-enterprisemessaging-instance-create.html)

1. Log on to your cloud system and navigate to Communication Arrangement.

2. Click New to create a new communication arrangement.

3. Choose sap_com_0092 as Scenario and copy the service key of your Integration Suite Event Mesh instance under Service Key.

4. Create a Communication User. Click New and enter a User Name, Description and Propose Password. Copy the generated password and save it for later. Click Create.

5. Now change the Arrangement Name to Z_EVT_0092_### and replace ### with your initials or group number. This Arrangement Name will also be the name of the channel which is used later to send events.

• Click Create communication arrangement.

6. Open your newly created communication arrangement and check the connection under Outbound Services to check if the connection is established and the channel is active.

1. Search for Enterprise Event Enablement App and open it.

   

2. Click Go to open a list of channels and choose your channel in this list.

   

3. Now add the outbound topic, which is generated during the event binding generation, in to this channel:

• Click Create
  

  

• On the next page click Topic value help

  

• In this popup search for zevent###/OnlineShop/create/* what you copied in step 8-5 and choose it. Replace ### with your number.

  

• Click Create

  

4. In your channel click on Metadata, download the AsyncAPI json file, open it to copy the channels data for later use.

5. Open your cloud system cockpit and navigate to Instances and Subscriptions and open Integration Suite application. Then click on Manage Business Events- Configure Events

6. Open the message client, navigate to Queues and click Create Queue.

7. Enter a queue name and click Create.

• Queue Name: onlineshop/### (replace ### with your number)

8. Double click on your newly created queue and on tab Subscriptions click on Create. Here enter the topic what you copied from the event metadata and click Create. The subscription to the selected topic is done.

1. Open ADT and open your SAP BTP ABAP environment system.

2. Navigate to your service binding ZUI_Z_ONLINE_SHOP_###_O4 and click Preview to open your application.

3. Click Create to order a new item.

4. Back to your cockpit and check in your event mesh under Queues if this event has reached the system. If you check the queue, a new message is arrived at the queue.

5. Navigate to Test and choose your queue under Queue in Consume Messages section.

6. Click Consume to consume this event in your applications. Here you can see that you have the type which you have find in the event binding and the transported data is the parameter structure.

You can also consume this event using Event Consumption Model within a Business Application

More information