Tutorial

Getting Started with Oracle SOA Suite Development

C2B2's Shanny Anoep shows us how to get going with Oracle's integration service software, SOA Suite.

Introduction

Oracle SOA Suite allows you to build integration services to connect different types of systems: File-based, Database, SOAP Services etc. 

You can build these services as an SCA Composite with Oracle JDeveloper using the Mediator, BPEL processes, Business Rule and Spring components of the SOA Suite. 

The completed SCA composite can then be deployed to a SOA Suite environment to start processing.

In this tutorial we will use JDeveloper to build a simple integration service that will poll a directory for incoming XML files, delete the files and write the files to another location, using the Mediator component.

Prerequisites

In order to complete this tutorial, you'll need to have the following software installed:

- JDK 6u21 / 7u10 or higherAfter installing the JDK, make sure so set the JAVA_HOME environment variable to the install location.

- Oracle JDeveloper  Studio Edition  11.1.1.17 (Note: the latest version is JDeveloper 12c, but this version does not support SOA Suite development yet.)

-  SOA Extension for JDeveloper 11.1.1.7.0 After installing JDeveloper, you can install the SOA Suite extension by opening JDeveloper and navigating the menu bar to Help > Check for Updates to install "Oracle SOA Composite Editor".

Creating the JDeveloper SOA Composite Project

The first step is to create a new JDeveloper Application that will contain a new SOA Composite project.

1. Open JDeveloper with the Default Role

2. Use File > New to open the New Gallery and select the "SOA Application"

You can name the Application however you want, it will serve as a container for the JDeveloper projects that contain the actual code. If the "SOA Application" is not present, you need to install the SOA Extension first.

3. After naming the Application, you're asked to name your project; we'll choose "FileProcessor". Here you can see "SOA" is already selected, so the SOA libraries will be available and a composite.xml will be generated on completion of the wizard.

4. In the "Project SOA Settings" screen, you're asked what the Composite should contain. Choose the "Composite with Mediator" option. The Mediator is the simplest component listed here and is typically used to validate, transform and route requests between components in the SOA Suite.

5. After creating the project, the first screen showed is the "Create Mediator" screen. Name it "FileMover" and keep the template on "Define Interface Later".


You'll now have a SOA Suite project opened, with a composite.xml that defines the entire application and the .mplan file that contains the Mediator's configuration.

Creating the File Adapter

6. Open the composite.xml from the Application Navigate screen.

If you open the composite.xml file, you'll see that the Mediator is the only component present. There is nothing that puts messages through the Mediator and there is no output. Let's add File Adapters to poll for files, pass them through the Mediator and send them off again.

7. Drag the FileAdapter from the Component Palette to the Exposed Service swim lane in the Composite design screen.


8. The File Adapter Configuration Wizard is opened. Name it "FilePoller" and choose the following options in the wizard:

Step 3: "Define from operation and schema (specified later)" in the next step.

Step 4: Choose "Read File" as the operation, since we are going to poll for files on the file system.

Step 5: Directory =  c:\incoming  (or any other directory that exists)

Step 6: Enter "*.xml" as the wildcard, so that we only pickup .xml files.  

Step 7: Keep the Polling Frequency options on default.

Step 8: Check the box for "Native format translation is not required".

In this case, we're not interested in manipulating the contents, so we can check this box. Typically, you would select a XML Schema that applies to the incoming files, so the XML content can be validated or transformed later on. Another option is to build a Native Format schema, which will translate content in plain text to XML elements.


9. Create another FileAdapter, but this time drag it to the "Exposed Services" swim lane. This FileAdapter will write the files. Choose the following options in the Wizard:

Step 2: Service Name = FileWriter

Step 3: Interface = Define from Operation and schema (specified later)

Step 4: Choose Write File

Step 5: Directory =  c:\outgoing  (or any other directory than the incoming)

File Naming Convention:  outbound_%SEQ%.xml

Step 6: Check the box for "Native format translation is not required".

Wiring the File adapters and the Mediator  

In the Composite design screen, you'll now see three components: the incoming FileAdapter, the Mediator and the outbound FileAdapter. In order for messages to flow from left to right, we need to wire the components.  

10. Drag the arrow from FilePoller to the left arrow of the Mediator component.  

By connecting the arrows, every file that is picked up by the FilePoller will now be sent to the Mediator as a request. From the Mediator we can then route the request to other components, for example BPEL, or to external system through one of the Exposed References.

11. Drag the right arrow from the Mediator component to the arrow on the FileWriter.

The flow of your integration service is now completed. The FilePoller will poll the directory every minute, once an .xml file is detected, it will send it to the Mediator which will route it to the FileWriter. The file will be deleted in the polling directory and written to the outgoing directory.

Building the deployment artefact

In order to test the service, the Composite needs to be deployed to a running SOA Suite environment. You can either build a deployment artefact - a JAR file - or make an Application Server Connection in JDeveloper and deploy through that. We'll build a SAR file, so you can deploy it through the Fusion Middleware Control web interface onto a SOA Suite environment.

12. Right-click the Project in the Application Navigator. Select Deploy to open the Deployment Wizard.

13. Choose Deploy to SAR file and leave the options to their default selection in the next steps.

14. After the deployment wizard is finished, JDeveloper will start building the deployable JAR file. In the Deployment Log screen you will see this message:

 

[01:13:20 PM] Wrote Archive Module to C:\JDeveloper\mywork\SOASuiteApp\FileProcessor\deploy\sca_FileProcessor_rev1.0.jar

 

Testing the application

By deploying the JAR file through the Fusion Middleware Control web interface it will start polling directly and moving files straight away.

15. Open the Fusion Middleware Control web interface for your running SOA Suite environment. The default URL is: http://<hostname>:7001/em

16. Navigate to the soa-infra screen, where the dropdown menu "SOA Infrastructure" is located.

17. Choose "Deploy" and select the created JAR file from the file selection dialog. Everything else can be kept at the default options.

Once it is deployed, create a new .xml file in the directory that you specified in the FilePoller. Once the FilePoller has detected it, you will see a new Composite instance in the FMW screen  and you can check the output directory to see whether it worked. 

Tip: the directory locations and the polling frequency can be changed by going to the Properties screen of the FileAdapters in the Fusion Middleware Control screen.

Source Code

The full code for this tutorial can be found at C2B2’s GitHub

Next Steps

As a next step I would suggest trying out manipulating XML messages by defining schemas and playing with the validation and transformation features of the Mediator.

After that I would recommend looking into the other components such as BPEL and Business Rules to implement more complex integration services. Also check out the various adapters in the Component Palette to connect to FTP servers, Databases, Web Services, etc.

Author Bio - Shanny Anoep is a Senior Middleware Consultant at C2B2 Consulting. Shanny has extensive knowledge on Oracle Fusion Middleware and Java/JEE technology, with experience as a technical consultant and in-house developer for large organizations in the financial, utilities, telecom and internet industry across the Netherlands, the United Kingdom and Singapore.

Shanny Anoep
Shanny Anoep

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