Information Technology Reference
In-Depth Information
services contain Liferay and the WS-PGRADE and VisIVO portlets while the back-
end services include the gUSE components. The database server, hosting the gUSE,
Liferay and VisIVO databases, resides on the back-end machine. The front-end
services components, provided by the WS-PGRADE/gUSE generic framework, are
extended with the VisIVO portlets
to complement
the
functionality of
WS-PGRADE/gUSE framework for the speci
c case of the VisIVO gateway.
The VisIVO community of advanced users are able to create, change, invoke,
and monitor workflows accessing all of the components of WS-PGRADE/gUSE,
while standard users are provided with easy-to-use speci
c web based user inter-
faces (VisIVO portlets) including the gUSE ASM API for reusing implemented
workflows stored in the local repository of gUSE Application. The VisIVO Mobile
application con
gures and submits workflows residing on the VisIVO Science
Gateway by means of the gUSE remote API.
13.2.1 VisIVO Portlets
The VisIVO Science Gateway portlets are designed as workflow-enabled easy-to-
use graphical environments to access the full functionalities of VisIVO tools.
Complex workflows employing VisIVO tools can be created and executed on a
variety of infrastructures (e.g., clouds, desktop and service grids or supercomputers)
to obtain comprehensive exploration and analysis of large-scale astrophysical
datasets. The VisIVO Library was developed to port VisIVO tools on gLite mid-
dleware. It allows a job running on a grid node to produce a set of images or movies
directly using VisIVO with its internal data arrays without the need to produce
intermediate
files. This is particularly important when running on a grid, where the
user wants to have a quick look at the results during the data production phase. The
images in this way can be produced directly in the grid catalogue, while the user
code is running in a system that cannot be directly accessed by the user (a worker
node).
The VisIVO Gateway offers role-based authorization modules and supports
login with user names and passwords. The main roles implemented are:
Guests are not provided with an account for the science gateway. However, they
can obtain information about the VisIVO project and the main features offered
by the gateway. A new account for standard and advanced user can be created
by an unknown user, or an existing Facebook or OpenId account can be lev-
eraged to access the portal.
Standard users are able to choose prede
ned workflows to become familiar with
the tools and speci
c workflows. The latter are offered via intuitive graphical
user interfaces which lower the barrier for utilizing the tools as well as allow
them to be used on high-performance computing facilities and DCIs. The users
are allowed to change input and parameters, and to invoke and monitor
workflows.
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