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public institutes (such as FAO) involved in the agINFRA project offer content
management systems (mainly Drupal) as user interfaces, a Drupal module has been
developed as additional interface for gUSE to search and to browse in the catalogue
of CIARD RING (thick lines), and to be able to submit and interpret the harvesting
workflow without using the general gUSE User Interface (see thin lines on the
figure). Then, gUSE enacts the workflow by executing harvester and transformator
components that are predeployed on the gLite-based distributed computational
resources and by invoking REST API web services (denoted as dotted lines on
the
figure). Records are placed on the distributed computing infrastructure and are
registered in the logical
file catalogue (LFC). To avoid exposing users to the
complicated security issues required by the applied technology, automated pro-
cesses are triggered by the register process to publish the records for other data
components outside of the grid using CouchDB (couchdb.apache.org). The work-
flow developed for this scenario is shown in Fig. 17.2 .
Fig. 17.2 Harvester workflow
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