No abstract

No abstract

One of the objectives of e-Research is to help scientists to accomplish their research, including scientific experiments, more effectively and efficiently. Web services provide communication between different platforms by using standardized SOAP message protocols. Hence, it is often productive to implement web service interfacees for the integration of experimental infrastructure into a collaborative e-Science framework. In this context, transfer and management of experimental data is an important problem.SOAP messaging is primarily oriented towards XML character data, with binary data transmitted with, for example, a base64 character encoding. However, as scientific experiments often generate binary data, transferring binary information by applying an encoding algorithm can slow down the performance of the system.The notion of web service attachment, has been introduced to solve this problem. In this paper, we illustrate how we use web services with attachments to improve binary data transfer performance.We present results of tests, using Axis2 and XFire APIs, conducted over a campus LAN, an inter-city WAN, and an intercontinental WAN. We also make some comparison with the use of GridFTP.Third IEEE International Conference on e-Science and Grid Computing 0-7695-3064-8/07 $25.00

No abstract

GridXSLT is an implementation of the XSLT programming language designed for distributed web service orchestration. Based on the functional semantics of the language, it compiles programs into dataflow graphs which can be efficiently executed across a collection of machines in a cluster or grid environment. Calls to web services can be made using the standard function call semantics provided by the language, and occur in parallel using the dataflow model of computation. The programmer is not required to explicitly specify the parallelism, as the details of how programs are scheduled and executed in a distributed environment are abstracted away by the runtime engine. XSLT provides a higher level programming model than many other approaches to web services composition; we explore its use here as a means of easing the task of orchestrating the interactions between services. In addition to the normal XSLT syntax, our system also supports programs written in XSLiTe, an alternative syntax we have developed which uses more concise representations of language constructs, increasing the ease of development, and bringing code readability closer to that of traditional programming languages. Our goal is to ease the construction of applications based on web services composition, such as those used in eScience and other fields in which service oriented architectures are prominent.