Java and C Clients

Message Queue provides a C API to its messaging services to enable legacy C applications and C++ applications to participate in JMS-based messaging.

The JMS programming model is the foundation for the design of a Message Queue C client. Sun Java System Message Queue 3.7 UR1 Developer’s Guide for C Clients explains how this model is implemented by the C data types and functions.

Like the Java interface, the C interface supports the following features:

• Publish/subscribe and point-to-point connections

• Synchronous and asynchronous receives

• CLIENT, AUTO, and DUPS_OK acknowledgement modes

• Local transactions

• Session recover

• Temporary topics and queues

• Message selectors

However, it is important to understand that the Java Message Service specification is a standard for Java clients only; thus the C Message Queue API is specific to the Message Queue provider and cannot be used with other JMS providers. A messaging application that includes a C client cannot be handled by another JMS provider.

The C interface, does not support the following features:

• The use of administered objects

• Map, stream, or object message types

• Consumer-based flow control

• Queue browsers

• JMS application server facilities (Connection Consumer, distributed transactions)

• Receiving or sending SOAP messages

• Receiving or sending compressed JMS messages

• Auto-reconnect or failover, which allows the client runtime to automatically reconnect to a broker if a connection fails

• The NO_ACKNOWLEDGE mode