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two workflows at both ends. We only show a workflow that at least
shares one service with one peer workflow, to guarantee that there is
no isolated node in Figure 8.8. The dense areas are cliques of
workflows sharing common utility services. Overlapped cliques
may also imply some common interests or goals.
Relation S
A workflow may be viewed as a recipe documenting how services
collaborate to fulfill a scientific experiment's requirement. Therefore,
service-service relation
S
can be seen as a collaboration network among
services—that is, services appearing in the same workflow collaborate
with one another.
Figure 8.9 highlights the betweenness of the largest component of
S
while neglecting other parts that are disconnected to this component.
In Figure 8.9, the size of a node is proportional to its betweenness
centrality; an edge's thickness is proportional to the number of
workflows that share the two services on its ends.
Figure 8.9
The largest component of service-service relation
S
with betweenness
centrality visualized.
