SEDA4SC: A staged event-driven architecture for adaptive service computing runtime

Abstract

The rapid development of web service technology brings up a number of crucial requirements for designing service computing runtime, such as supporting multiple message exchange patterns, switching among different transports, integrating various extended web service protocols and achieving robust performance under high concurrency. Based on staged event-driven architecture, we propose a novel architecture for an adaptive web-service-centric service computing runtime, named SEDA4SC. In SEDA4SC, the process of basic and extended web service protocols is divided into four primary event-driven stages to enable system independence and module isolation. Moreover, this architecture allows messages to be handled in two independent pipelines: the input pipeline and the output pipeline. Arbitrary message exchange patterns can be supported through a combination of the two pipelines. With SEDA4SC, we design and implement a service computing runtime system. The performance evaluation results show that our system exhibits robust performance under high concurrency.

A Web Services Container Supporting QoS Hierarchical Control with Multiple Measurements for Utilization

“…We realize a web services container supporting QoS hierarchical control with multiple measurements of utilization applying the QoS hierarchical control mixed strategy based on SEDA4SC middleware platform [6] .…”

“…The SEDA4SC platform [6] is based on the Staged EventDriven Architecture (SEDA) [10], where the entire message processing chain is divided into four primary event-driven stages: transport stage, message stage, service stage and adaptation stage to reduce the dependencies among protocol implementations. Event queue is applied to connect different stages.…”

“…In order to satisfy the contracts defining in Equation 6, if service average response time of service i violates the provisions of SLA, we need to double the value of the resource allocation weight:…”

“…Second, we present a QoS hierarchical control mixed strategy supporting QoS hierarchical control with multiple measurements for utilization. Third, based on the SEDA4SC platform [6], we realize a web services container supporting QoS hierarchical control with multiple measurements of utilization using the mixed strategy. The result of the test shows that the web services container realized can support QoS hierarchical control with different measurements for utilization.…”

FSM4WSR: A Formal Model for Verifiable Web Service Runtime

“…We also need a Java foundation framework (see Figure 8) to handle the other things needed by runtime, such as network connection, thread scheduling, message queueing, service management, etc. The detailed introduction of the framework is given in our works [16]. By combining SODL with the Java framework, we finally construct a verifiable web service runtime system, named XServices SODLRuntime [27].…”