AUTOMATIC PROXY GENERATION AND LOAD-BALANCING-BASED DYNAMIC CHOICE OF SERVICES

Jarosław Dabrowski; Sebastian Feduniak; Bartosz Balis; Tomasz Bartynski; Wlodzimierz Funika

doi:10.7494/csci.2012.13.3.45

Authors

Jarosław Dabrowski AGH University of Science and Technology, Faculty of Electrical Engineering, Automatics, Computer Science and Electronics, Department of Computer Science, al. Mickiewicza 30, 30-059 Krakow,
Sebastian Feduniak AGH University of Science and Technology, Faculty of Electrical Engineering, Automatics, Computer Science and Electronics, Department of Computer Science, al. Mickiewicza 30, 30-059 Krakow,
Bartosz Balis AGH University of Science and Technology, Faculty of Electrical Engineering, Automatics, Computer Science and Electronics, Department of Computer Science, al. Mickiewicza 30, 30-059 Krakow
Tomasz Bartynski AGH University of Science and Technology, ACC Cyfronet AGH, ul. Nawojki 11, 30-950 Krakow,
Wlodzimierz Funika AGH University of Science and Technology, Faculty of Electrical Engineering, Automatics, Computer Science and Electronics, Department of Computer Science, al. Mickiewicza 30, 30-059 Krakow,

DOI:

https://doi.org/10.7494/csci.2012.13.3.45

Keywords:

proxy, load-balancer, load-balancing, automatic generation

Abstract

The paper addresses the issues of invoking services from within workﬂows which are becoming an increasingly popular paradigm of distributed programming. The main idea of our research is to develop a facility which enables load balancing between the available services and their instances. The system consists of three main modules: a proxy generator for a speciﬁc service according to its interface type, a proxy that redirects requests to a concrete instance of the service and load-balancer (LB) to choose the least loaded virtual machine (VM) which hosts a single service instance. The proxy generator was implemented as a bean (in compliance to EJB standard) which generates proxy according to the WSDL service interface description using XSLT engine and then deploys it on a GlassFish application server using GlassFish API, the proxy is a BPEL module and load-balancer is a stateful Web Service.