CORBA Examples

This section shows some examples that use the JTS interface for CORBA client code and CORBA server objects. See "Transaction Examples" for a set of complete examples that you can run and modify.

Client-Side Demarcation

Follow these steps to use JTS methods in your CORBA client code:

• Import the following packages:
  • oracle.aurora.jts.client.AuroraTransactionService

  • oracle.aurora.jts.util.TS

  • org.omg.CosTransactions

• Invoke AuroraTransactionService.initialize(), passing to it the service URL for the application (for example, sess_iiop://localhost:2481:ORCL) and the JNDI initial context.

• Begin a transaction by invoking oracle.aurora.jts.util.TS.getTS().getCurrent().begin().

For example:

import oracle.aurora.jndi.sess_iiop.ServiceCtx;
import oracle.aurora.jts.client.AuroraTransactionService;
import oracle.aurora.jts.util.TS;
import org.omg.CosTransactions.*;
// Include normal startup code...
// Initialize a transaction context...
AuroraTransactionService.initialize(ic, serviceURL);

// Begin a transaction...
oracle.aurora.jts.util.TS.getTS().getCurrent().begin();

// Call methods that involve SQL DML...
employee.updateEmployee(info);
...
// Commit (or roll back) the SQL statements...
oracle.aurora.jts.util.TS.getTS().getCurrent().commit(false);

For a complete example that uses these techniques for client-side transaction demarcation, see "clientside".

Server-Side JTS

Follow these steps to use JTS methods in your CORBA server object code:

• Import the following packages:
  • oracle.aurora.jts.util.TS

  • org.omg.CosTransactions

• You do not need to invoke AuroraTransactionService.initialize() on the server, as the server does this for you.

• Begin a transaction by invoking TS.getTS().getCurrent().begin(). You can do this in a separate method, or as part of a method that does the first SQL DML using JDBC or SQLJ. A transaction spans methods--its scope is within the session where it is begun.

• End a transaction by invoking TS.getTS().getCurrent().commit(false), or TS.getTS().getCurrent().rollback().

You can also invoke other JTS methods, such as set_timeout(), from within a server object.

See the complete example at "serversideJTS" for a demonstration of CORBA server-side transaction demarcation.

Transactions in Multiple Sessions

See the complete example at "multiSessions" for an example that establishes multiple server sessions, each with its own transaction context.

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