Practical Concurrency Support for Web Service Transactions

Traditional database concurrency control methods use locking, timestampordering, and optimistic-ordering to achieve DB consistency. However, these approaches are not suitable for long-running Web Service Compositions (WSCs) due to associated performance degradation. Our hypothesis asserts that, using transactional semantic and ordering information, the execution time of a WSC can be reduced, thus allowing the use of traditional database concurrency control methods while avoiding unacceptable performance degradation. Our solution is based on the following approaches: § We model a WSC as WS-BPEL specification, i.e., a partial order of WS transactions. § We allow some of the WS transactions in the WSC to execute in parallel. § We use traditional locking mechanism for WSC to guarantee database consistency. To identify WS transactions that can execute parallel, we analyzed the WS-BPEL specification of the WSCs. The research tasks follow: § Task 1: Identify WS transaction precedence relations § Task 2: Build Parallel Execution Scenarios (PES) § Task 3: Investigate possible further improvement of WSC execution schedule. For Task 3, we propose the following sub-tasks: o Increase the number of WSs executing in parallel, and o Execute concurrently those WSs that have similar execution time In our work we will present our theoretical model and complexity calculation

a transaction model for long running business processes

I2S Informatica Sistemas Servicos; Oni; Associacao Comercial do Porto; Camara Municipal do Porto; SograpeMany business processes in the enterprise applications are both long running and transactional in nature, but currently no transaction model can provide full transaction support for such long running business processes. In this paper, we proposed a new t

A TRANSACTION MODEL FOR LONG RUNNING BUSINESS PROCESSES*

Abstract: Many business processes in the enterprise applications are both long running and transactional in nature, but currently no transaction model can provide full transaction support for such long running business processes. In this paper, we proposed a new transaction model — PP/T model. It can provide full transaction support for the long running business processes, so that application developers can focus on the business logic, with the underlying platform providing the required transactional semantics. Simulation results show that the model has good performance in processing the long running business processes.