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Fig. 4.1 DCI Bridge architecture overview
Generic Metabroker Service (GMBS) (Kertesz 2010). This service acts as a broker
among different types of DCIs: upon user request it selects an adequate DCI (and,
depending on the DCI, an execution resource as well) for executing the user
s job.
Just like the DCI Bridge, GMBS accepts JSDL job descriptions and makes use of the
DCI Bridge service to actually run the job on the selected DCI.
The DCI Bridge can be used as a stand-alone service [DCIBRIDGE] and also as
part of the WS-PGRADE/gUSE gateway framework service set. In the current
chapter we focus on the features that are used inside WS-PGRADE/gUSE. In this
context WS-PGRADE/gUSE and the DCI Bridge have the following three main
important roles and properties:
'
1. WS-PGRADE provides the user interface where the references to the DCI
resources can be de
ned. Consequently, only those DCI resources are visible
during workflow/job con
gurations that have been de
ned by the System
Administrator of WS-PGRADE.
2. WS-PGRADE contains the default base parameters for remote resources.
Consequently, the actual job submissions can be controlled and observed via the
DCI Bridge.
3. DCI Bridge can provide an interface for external brokering services. As a unique
and single interface the DCI Bridge is an ideal insertion point for
“
meta-brokering
”
.
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