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The kernel is designed to be simple and limited in its capabilities: it wires functional units together. Capabilities such as service discovery, reliability, support for transport protocols, etc. are provided through extensions. The kernel extension model is based on the SCA 1.0 Java programming and assembly model. In otherwords, the kernel uses SCA to bootstrap itself. The mechanics of how this is done are described in detail elsewhere Kernel SCA Java Architecture.

The kernel is divided into a number of modules: api, host_api, spi and core. The api module defines Tuscany proprietary programming model annotations and APIs. The host_api module defines APIs for interacting with the kernel. The spi module defines extension points and abstract helper classes. The core module contains the kernel implementation.

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