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This paper presents an on-line admission control methodology for periodic and aperiodic service processes with end-to-end real-time constraints. Both types of service process requests dynamically join and leave a system at run time. During the admission test, the schedulability of a periodic task is determined by using its fixed task capacity. Aperiodic tasks are admitted using the available capacity...
Many SOA applications are now migrating to cloud servers, due to cloud's low cost provision, elasticity for growth, and better availability. Although cloud service providers have implemented reliable management system for their infrastructure, hybrid cloud users often lack easy monitoring and diagnosis facilities to discover the root cause of end-to-end QoS violations. However, the cause must be identified...
This paper presents an on-line admission control algorithm for one-time aperiodic service requests and periodically generated service processes with real time constraints. Both types of service requests dynamically come and leave the system at run time, making any off-line analysis infeasible. During admission test, periodic task schedulability is determined by using per-task fixed capacity policy...
Service-oriented architectures (SOA) provide application systems the flexibility and cost-savings of dynamically composing workflows from reusable services. However, current SOA frameworks do not provide support for real-time workflow planning and execution. The goal of the RT-Llama SOA middleware framework is to address these new requirements. It works both at the service-level, by enhancing existing...
In this paper, we study the algorithms to estimate the response times of service executions during real-time service composition. By using reservation schedules to derive server utilization, we can compute a more realistic response time for each service than its static execution time. Reservation schedules are kept in a system data structure called hierarchical TBTree (hTBTree). Using these response...
This paper studies a flexible scheduling data structure that is used to manage out-of-order service requests in real-time service-oriented architecture (RT-SOA) applications. We propose a hierarchical TBTree (hTBTree) to record server availability across a hierarchy of time intervals with different degrees of time granularity. Real-time services need to find enough time interval in hTBTree for their...
Service-oriented architecture (SOA) provides the flexibility of dynamically composing business processes in enterprise computing. However, they must be enhanced to support real-time activities in future SOA applications such as media streaming, control applications, cyber-physical, and intelligent vehicle systems. In this paper, we present the RT-Llama SOA middleware to support predictability in real-time...
One of the challenges in SOA is to provide an efficient and effective way to identify compatible Web service(s) and compose them into a service process that satisfies a userpsilas functional and non-functional needs. Quality of service (QoS), like response time or throughput, might need to be optimized for the selected service process. This paper describes a system architecture and strategies Web...
Service-oriented architectures (SOA), though widely accepted in a variety of industries, must be enhanced to support real-time activities in order to gain even greater adoption. We present RT-Llama, a novel architecture for real-time SOA to support predictability in business processes. Based on a user-specified process and deadline, our architecture, containing global resource management and business...
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