The FIX transport

IBM® Rational® Integration Tester uses the Financial Information eXchange (FIX) transport to connect to applications that use the FIX protocol, acting as a client (initiator) or as a server (acceptor). Additionally, Rational Integration Tester uses packet capture software to record FIX conversations over the FIX transport.

Rational Integration Tester supports FIX versions 4.0 through 4.4. The FIX transport is created when you set up a physical FIX Connection component in Architecture School. Creating the transport also creates a schema that can be viewed or modified in the Schema Library and applied to messages as a schema in the same way that you might apply a FIX dictionary (see FIX dictionaries).

Note: Rational Integration Tester uses the QuickFIX/J engine (Java™ version of QuickFIX) FIX implementation. For more information, refer to http://www.quickfixj.org.

Sequence numbers

The FIX protocol requires each application to maintain two sequence numbers per session: incoming and outgoing. The numbers are independent of each other, although sequence numbers are always found in Field 34 of the message (commonly referred to as "Tag 34"). The application increments the outgoing sequence number and sets Field 34 equal to that value in each outgoing message. For incoming messages, the application increments the stored incoming sequence number and verifies that it matches the value of Field 34 of the incoming message.

Two settings for the FIX transport affect the way a stub uses sequence numbers:

Reset sequence numbers on logon on the Session page
Storage type on the Storage page

These effects are shown in the following table:

Table 1. Transport settings and sequence numbers
Value of "Reset sequence numbers..."	Storage type	Header
Selected	File or In memory	Sequence numbers are reset with each logon.
Clear	File	Sequence numbers are maintained between multiple runs of the stub and multiple runs of Rational Integration Tester.
Clear	In memory	Sequence numbers are maintained between multiple logons, but cleared if the stub is restarted.

Create the FIX transport

The FIX transport is created when you create a physical FIX Connection resource in Rational Integration Tester Architecture School.

In Architecture School, you can create a resource in two ways:

In the Logical View, either select General > FIX Endpoint from the toolbar, or right-click a TIBCO Rendezvous Bus and select New > General > FIX Endpoint.
In the Physical View, select General > FIX Connection from the toolbar.

Each physical FIX Connection resource represents a FIX transport that can be selected and configured later on.

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