The JCA test framework can be used to simulate backend systems that are accessed through the use of the JCA Common Client Interface API. Application code that uses the Common Client Interface can be executed against a simulated connector. The test framework intercepts the backend call and provides a suitable response.

The JCA test module consists of the ConnectorTestModule and the corresponding ConnectorTestCaseAdapter and BasicConnectorTestCaseAdapter. The backend call is handled by an implementation of the interface InteractionImplementor. Mockrunner provides several implementations of this interface for interactions that are based on indexed and mapped records, on binary byte data and an implementation for applications that use the WSIF framework in IBM environments. It is also possible to plug in custom implementations.

This page provides a simple example of a DAO that calls a CICS backend. The release contains additional examples. The PersonSearchDAO contains one method findPersonById that takes an id and returns the corresponding person data as a Person object. 


public class PersonSearchDAO
{
    private ConnectionFactory connectionFactory;

    public PersonSearchDAO()
    {
        try
        {
            InitialContext context = new InitialContext();
            connectionFactory = 
               (ConnectionFactory)context.lookup("java:ra/cics/ConnectionFactory");
        } 
        catch(NamingException exc)
        {
            throw new RuntimeException("Failed to create ConnectionFactory");
        }
    }

    public Person findPersonById(String id)
    {
        Connection connection = null;
        Person request = new Person();
        request.setId(id);
        Person response = new Person();
        try
        {
            connection = connectionFactory.getConnection();
            Interaction interaction = connection.createInteraction();
            ECIInteractionSpec interactionSpec = new ECIInteractionSpec();
            interactionSpec.setFunctionName("PER3AC");
            interactionSpec.setInteractionVerb(ECIInteractionSpec.SYNC_SEND_RECEIVE);
            interactionSpec.setCommareaLength(32);
            interaction.execute(interactionSpec, request, response);
        } 
        catch(ResourceException exc)
        {
            exc.printStackTrace();
        }
        finally
        {
            try
            {
                if(null != connection) connection.close();
            } 
            catch(ResourceException exc)
            {
                exc.printStackTrace();
            }
        }
        return response;
    }
}

The corresponding test uses two files personin.bin and personout.bin. These files are snapshots of a real mainframe communication. Once created, the snapshot files can be used to simulate mainframe access in tests. The personin.bin file represents an empty person with an id of 1, which is the request. The personout.bin contains the user data for the person with id 1. If we search for a user with id 1, the framework recognizes that the actual request matches the expected request and returns the actual response (the personout.bin data). 


public class PersonSearchDAOTest extends ConnectorTestCaseAdapter
{
    private EJBTestModule ejbModule;
    private PersonSearchDAO dao;
    
    protected void setUp() throws Exception
    {
        super.setUp();
        ejbModule = createEJBTestModule();
        ejbModule.bindToContext("java:ra/cics/ConnectionFactory", 
                      getConnectorMockObjectFactory().getMockConnectionFactory());
        dao = new PersonSearchDAO();
    }
    
    private void prepareInteraction() throws Exception
    {
        StreamableRecordByteArrayInteraction interaction = 
                                         new StreamableRecordByteArrayInteraction();
        FileInputStream request = 
           new FileInputStream("src/com/mockrunner/example/connector/personin.bin");
        FileInputStream response = 
           new FileInputStream("src/com/mockrunner/example/connector/personout.bin");
        interaction.setExpectedRequest(request);
        interaction.setResponse(response);
        getInteractionHandler().addImplementor(interaction);
        request.close();
        response.close();
    }

    public void testFindPersonById() throws Exception
    {
        prepareInteraction();
        Person response = dao.findPersonById("1");
        assertEquals("1", response.getId());
        assertEquals("Jane", response.getFirstName());
        assertEquals("Doe", response.getLastName());
        assertEquals(30, response.getAge());
        verifyConnectionClosed();
        verifyAllInteractionsClosed();
    }
}

This example uses the StreamableRecordByteArrayInteraction which can always be used when the involved Record classes implement Streamable and if you are able to create binary snapshots of a real interaction. If you don't want to deal with binary data you may consider using WSIFInteraction or to provide your own implementation of InteractionImplementor.