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The OSOA Collaboration has published the V1.00 version of the SCA Assembly Extensions for Event Processing and Pub/Sub specification.

This document describes the Event Processing and Pub/Sub Extensions for the SCA Assembly Model, which deals with

1. Event Processing, which is computing that performs operations on events, including creating, reading, transforming and deleting events or event objects/representations. Event Processing components interact by creating event messages which are then distributed to other Event Processing components.  An Event Processing component can, in addition, interact with other SCA components using SCA's regular service invocation mechanisms.
2. Publication and Subscription (often shortened to Pub/Sub), which is a particular style of organizing the components which produce and consume events in which the producing components are decoupled from the consuming components. Components that are interested in consuming events specify their interest through a subscription rather than an interface. The same event may be received by multiple subscribers.

The document starts with a description of the Event Processing and Pub/Sub extensions and then goes on to show the changes to the relevant parts of the SCA Assembly specification that are required by these extensions. This document is based on the OSOA SCA Assembly Specification V1.00.

You can find the new specification on the Service Component Architecture Specifications page.