154 Workflow Management and Execution Using BeesyCluster
• Middleware—business layer:
– Authorization Service (AS)—for verification of access of users and
groups to resources, storing information about users, resources,
privileges, delegations, etc.
– Payment Service (PS)—handling access to paid resources with ac-
counting.
– Run Anywhere (RA)—a proxy for accessing and launching com-
mands on distributed servers and clusters connected to the system
using SSH; it is also the low-level layer for transfer of files between
the BeesyCluster server ...