Overview

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Java SCA provides the infrastructure to develop and run SCA based applications. At the very high level, JAVA CA can be divided into the kernel and extensions. The kernel supports SCA assembly, Tuscany value add functions and easy plug-points for extensions. The kernel is designed to be embedded in, or provisioned to, a number of different host environments.

Extensions can be divided into 3 categories: 1) Component implementation types such as Srping, Groovy and javaScript, 2) Binding types such as Axis, CXF and 3) DataBinding types such as SDO, JAXB.

Tuscany community has contributed to making a set of extensions available with Tuscany releases. A list of the extensions is shown below. Some of these extensions are available with specific releases of Tuscany SCA Java depending on contribution for that release. If you are interested in adding to these extensions or enhancing an existing extension, simply get involved.

Tuscany SCA Java Sub-Project

The Java SCA sub-project aims to provide enterprise-grade service infrastructure based on SCA. Some of our principles include:

• We are not a reference implementation but a community that seeks to innovate based on the tenets of SCA.
• We build runtimes that are distributed under the Apache Software License.
• We believe developing highly scalable service-based systems should be easier than it currently is.
• We believe in providing users with flexibility and choice. We do not dictate programming models but support many. Our runtimes are designed to be highly extensible so users may customize them to fit their needs.
• We provide frequent releases of our software so users can experience the newest features and have access to the latest bug fixes.

What's New

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We are currently planning an alpha release of the latest kernel version with support for a subset of SCA 1.0 features. This is intended as a release for users to try new features introduced in the specifications, including:

• A new assembly syntax
• Autowire
• Stateful conversations
• The new Java API and Annotations

We have also extensively refactored the kernel for increased modularity, simplification, and support for federated deployment, which will be introduced in the release following the alpha. For full details, see the Release Notes.

Tuscany SCA Java

Tuscany Java SCA is a lightweight runtime that is designed to run standalone or provisioned to different host environments. The modularized architecture allows users to pick and choose modules that cater to their business needs therefore resulting in small footprint.

At a high level,Tuscany Java SCA infrastructure can be divided into two categories of modules: core and extensions. The core modules consist of selectable components that provide support for SCA and data handling as well as the core runtime. The core runtime includes functions such as loading system and application services, building and managing composites. The extension category consists of a set of selectable modules that support integration of various technologies that are required in SOA environment. This includes support for various protocols through bindings, programming languages through implementations, data types, security and transaction through policies. This whole thing constitutes an SCA node. An SCA composite application can be spread across multiple nodes in a cloud or be run on a single node. This administrative scope is referred to as the SCA domain.
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For a complete list of supported extensions please see extension documentation . The extensible architecture of SCA Java allows any missing extension to be easily added.

Tuscany SCA Java has implemented SCA specifications 1.0 defined by www.osoa.org in its 1.x code line. Tuscany community is working on compliance with OASIS version of SCA in 2.x code line. To document the work in progress we have created a roadmap page on our wiki Java SCA Roadmap Wiki Page. Please consider yourself invited to get involved in any of these items or suggest new ones that you want to work on.

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