Composing aggregate web services in BPEL

Proceedings of the 6th International Conference on Web Information Systems and Technology

2010

Abstract:The distributed nature of services poses significant challenges to building robust service-based applications. A major aspect of this challenge is finding a model of service integration that promotes ease of dynamic reconfiguration, in response to internal and external stimuli. Centralized models of composition are not conducive for data-intensive applications such as those in the scientific domain. Decentralized compositions are more complicated to manage especially since no service has a global view of the interaction. In this paper we identify the requirements for dynamic reconfiguration of data-intensive composite services. A hybrid composition model that combines the attributes of centralization and decentralization is proposed. We argue that this model promotes dynamic reconfiguration of data-intensive service compositions.

Section: High-level Compositionmentioning

confidence: 99%

Dynamically Reconfigurable Data-Intensive Service Composition

Ezenwoye

Busi

Proceedings of the 6th International Conference on Web Information Systems and Technology

2010

“…The flow manager captures the flow of operations that are involved in the Ensemble run, namely the data initialization tasks, WRF model execution tasks and data gathering and post-processing tasks. We use the WS-BPEL [24] standard as the workflow language, where job executions are modeled as graphs. The nodes of the graph represent tasks and the edges represent inter-task dependencies, data flow or flow control.…”

Section: Job Flow Managementmentioning

confidence: 99%

Transparent grid enablement of weather research and forecasting

Proceedings of the 15th ACM Mardi Gras Conference: From Lightweight Mash-Ups to Lambda Grids: Understanding the Spectrum of Dis

Fong

Badía

et al. 2008

Self Cite

The impact of hurricanes is so devastating throughout different levels of society that there is a pressing need to provide a range of users with accurate and timely information that can enable effective planning for and response to potential hurricane landfalls. The Weather Research and Forecasting (WRF) code is the latest numerical model that has been adopted by meteorological services worldwide. The current version of WRF has not been designed to scale out of a single organization's local computing resources. However, the high resource requirements of WRF for fine-resolution and ensemble forecasting demand a large number of computing nodes, which typically cannot be found within one organization. Therefore, there is a pressing need for the Grid-enablement of the WRF code such that it can utilize resources available in partner organizations. In this paper, we present our research on Grid enablement of WRF by leveraging our work in transparent shaping, GRID superscalar, profiling, code inspection, code modeling, meta-scheduling, and job flow management.

“…These services then become reusable components that can be the building blocks for more complex aggregate services (business processes). To facilitate the creation of business processes, a high-level workflow language, such as Business Process Execution Language (BPEL) [11,25], is used. BPEL is an XML-based workflow language that weaves together basic and structured activities to create the logic of a business process.…”

Section: Web Services and Bpelmentioning

confidence: 99%

“…Since BPEL is not a general-purpose programming language, it lacks the necessary constructs that would be needed to deserialized the generic output message (genericOutputMessage) of the generic proxy. One solution to this problem, without extending the BPEL language, is to use a partner Web service to perform more complicated data manipulation [11]. To this end, we have decided to use the generic proxy to deserialize the genericOutputMessage.…”

mentioning

confidence: 99%

TRAP/BPEL - A Framework for Dynamic Adaptation of Composite Services

Ezenwoye

Proceedings of the Third International Conference on Web Information Systems and Technologies

2007

Abstract. TRAP/BPEL is a framework that adds autonomic behavior into existing BPEL processes automatically and transparently. We define an autonomic BPEL process as a composite Web service that is capable of responding to changes in its execution environment (e.g., a failure in a partner Web service). Unlike other approaches, TRAP/BPEL does not require any manual modifications to the original code of the BPEL processes and there is no need to extend the BPEL language nor its BPEL engine. Furthermore, TRAP/BPEL promotes the reuse of code in BPEL processes as well as in their corresponding autonomic behavior. In this paper, we describe the details of the TRAP/BPEL framework and use a case study to demonstrate the feasibility and effectiveness of our approach.