Introduction to Science Gateways and Science Gateway Frameworks - Science Gateways for Distributed Computing Infrastructures - page 14

5 can be repeated in as many times as required. Every
iteration results in a further improved and extended SG instance for the user
community.

Of course, steps 2

-

1.7 How to Read This Topic?

The main goal of the topic is to transfer the knowledge of building science gate-
ways for those communities who would like to develop their own science gateway
instance in the future or who would like to extend or improve their existing science
gateway with new functionalities, services, portlets, and work ows. The topic

summarizes those technologies that we have developed in the SCI-BUS project
concerning building general-purpose science gateway frameworks as well as cus-
tomizing the framework toward domain- and application-speci

c science gateway

instances. Since work ows play more and more important roles in IT-based sci-

enti c research, we also show how the SCI-BUS work ow technology can be used

and extended with other work ow interoperability tech-

nology developed in the EU FP7 SHIWA project and currently actively used in the
EU FP7 ER-Flow project (see Chap. 8 ) .
The topic is divided into three main parts. After the current chapter, the rst part
describes the core SCI-BUS gateway framework technology, WS-PGRADE/gUSE.
Chapter 2 gives a generic introduction to WS-PGRADE/gUSE science gateway
framework technology and summarizes the main features of WS-PGRADE/gUSE.
Since all the other chapters are built on the knowledge described in this chapter it is
recommended that everyone read this chapter. Similarly, reading of Chap. 8 is also
recommended for every reader since it explains all the major use-case scenarios
where the gateway framework can be applied.
Chapter 4 describes the DCI Bridge service that enables access to a large set of
DCIs via a common interface based on the OGF standard BES. Since any work

ows by using the work

ow
systems and existing gateways can be extended to be able to exploit this service,
any reader who is interested in extending their work

ow system and gateway with
access to such a large set of DCIs should read this chapter. Similarly, Chap. 7
describes the Data Avenue service that enables file transfer between different DCI

storages having different protocols. This is a very generic service that can be used
independently from WS-PGRADE/gUSE, and hence readers who would like to
extend their work

ow manager and gateway to exploit this service should read this

chapter.
The following chapters should be read by those readers who are interested in
learning more on the following aspects of WS-PGRADE/gUSE:

￿ Work ow concepts of WS-PGRADE/gUSE (Chap. 3 )

Executing WS-PGRADE work ows in various Distributed Computing Infra-

structures and the DCI Bridge service (Chap. 4 ) .

￿

Security aspects of WS-PGRADE/gUSE (Chap. 6 )

￿