An Approach for Grid Service Orchestration on Globus

Abstract

Grid Service Orchestration implies the intermediate processing involved after the client has invoked a composite grid services to be interpreted as a series of encapsulated Globus grid services. Whenever multiple grid services are participating in a composite grid service, different services play different role as a part of the whole process. After invoking all the participant services with the intermediate results, soon after getting results from the final grid service, final result is sent back to the user. Member services of the orchestration are invoked according to a predefined XML definition which is known as GSO.xml. Invocation order of the Orchestration is occurred according to the xml definition. In order to evaluate the grid service orchestration on Globus two independent mathematical services have been implemented. One grid service is to multiply a given input and the next is to subtract a given input. By using orchestration grid service with the XML command definition those two services are invoked automatically and sequentially. Implementation has been done on Globus grid environment with Java WS core service container. Globus is the widely using open source grid middle-ware for grid computing. Therefore, the orchestration has been done on the Globus grid environment. Orchestration service has been implemented by using Globus s Java grid programming API. Grid Service Orchestration reduces client side work load in designing composite services. This is achieved by encapsulating inter service interactions from the client.