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Simple: Users can access and run the workflows implementing SSFs through a
web-based interface holding typical GUI elements as well as interactive maps.
Advanced: Users can code their models in a programming language (such as C,
C++, Fortran) calling any combination of SSFs.
Expert: Users can design and use their own complex workflows by embedding
the SSF workflows provided.
SSS-Gateway is built on the gUSE framework as its features directly
t to the
requirements of the gateway as summarised below:
The requirement for user management, together with role assignments for dif-
ferent service levels, is appropriately handled by WS-PGRADE.
The simple service level is easily achieved by developing Liferay portlets
accessing the gUSE services, like workflow management, through the ASM
API.
The advanced service level needs an environment that lets user codes call the
SSF workflows, which is enabled by the Remote API.
The expert service level is matched by the power-user mode of the
WS-PGRADE/gUSE framework. In this mode, the expert users can download
the SSF workflows from the workflow storage and embed them into their own
complex workflows. In such usage, the expert users can handle their workflows
through the workflow management facilities of WS-PGRADE front-end and
their datasets with Data Avenue.
Parameter sweep support for workflows considerably simpli
es both develop-
ment of logic-tree based analysis functionality and the parallelization of
compute-intensive SSFs.
Since the SSS-Gateway targets a wider community, unlike the Seismology
Portal which focused on the South-Eastern European region only, it requires
various types of DCIs of the research groups to be supported by the gateway.
This requirement is clearly met by the DCI Bridge component of gUSE.
Robot certi
cation makes it possible that a user, who currently has no valid
certi
cate or account for accessing a DCI, can submit test runs.
With the help of gUSE cloud support, nonacademic users can submit their jobs
to public clouds.
12.3 Developing SSS-Gateway
SSS-Gateway provides a comprehensive set of methods in the
field of statistical
seismology for e-scientists. This gateway implements the following SSFs, reflecting
the latest advances in the literature, for the international seismology community:
SSF1 Integration of multisource data for increased reliability and quality
SSF2 Determination of probability distributions and their input parameters
SSF3 Robust techniques for parameter estimation in models and relations
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