Oracle Service Bus : Split Join Example

Thanks to Edwin to highlight this feature.

One of the cool features of the OSB is Split-Join feature with this you can split up you service request message and process these parts parallel. This part can be processed in an other service. The results or errors of these parts will be later joined together and send back in the response of the proxy service. In this blog I will use a Web Service which has as input Orders and we will split these orders to one order. Because I don't know how many orders I can receive we need to use a Dynamic Split-Join.

This is the xsd I used

I created a WSDL with operation which has a request and a response based on the xsd above

Create a new Split-Join ( You have to do this from the workshop application) where we select the operation of the just created wsdl
The Split-Join automatically creates two variables.

We have to initialize the response variable by adding an assign action where I add the result element to the response variable. Put this Assign action right after Receive
Now we can add a For Each Flow Control which will handle every Order, Put this after the Assign Action.

Select the For Each component where we can define the parallel mode of the order processing and we have to define the counter variable name which start in my case with 1 and ends with the count of the order elements.
Add a new variable order which is based on the order element. We will copy later one order to this variable.
Add a copy action to the Scope window of the For Each component where we use the counter variable to get the right order and pass this value to the order variable. (
$request.parameters/def:Orders/def:Order[$counter] )
Let's change the status of a order by adding a new copy action. Normally you will call an external service which processes the order and returns the result.
Now we collect the result of an order and this to the right place in the responce variable.
A Split-Join can only be called from a business service so let's create one automatically.

This business can be called by a proxy service. Create a proxy service based on the same WSDL as the split-join.
Add some routing to this proxy so the split-join business service is called from this proxy service
Publish this project to the ESB where we can test the proxy service. OSB automatically generates a example orders xml where we will add an extra order.
And voila here is the response where the status element value of the orders are changed to processed.