The LLAMA Middleware Support for Accountable Service-Oriented Architecture
ICSOC '08 Proceedings of the 6th International Conference on Service-Oriented Computing
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As more enterprises turn to SOA for the flexible deployment of business processes, adaptable and highly configurable infrastructures can be used to ensure that end-to-end quality of service requirements are met via automatic and dynamic process monitoring, diagnosis, and routing. We present the inteLLigent Accountability Middleware Architecture (LLAMA) to support extensible SOA-based service process composition, run-time management, and configuration. It includes the infrastructure to continuously monitor services within an active service workflow, and dynamically adapt by performing run-time process reconfigurations. An open source enterprise service bus (ESB) project, Mule, has been adopted to incorporate its routing and interception mechanisms to create the LLAMA ESB to achieve dynamic configurability and dynamic routing that can be controlled and adjusted at run-time through agents and other LLAMA components and brokers. We measure the performance of the LLAMA ESB, specifically, the overhead of interceptors, and the profiling and dynamic routing infrastructure. We find that there is no significant overhead imposed by the LLAMA ESB.