Introduction to the WS-PGRADE/gUSE Science Gateway Framework - Science Gateways for Distributed Computing Infrastructures - page 27

Fig. 2.6 The three main parts of the submission phase in WS-PGRADE

component nodes with their status information. Users may suspend or abort the
execution of a running instance. A previously suspended work ow instance can

be resumed at any time.
3. Once the status of the component node turns to

“ “finished”, ” , the result files can be

accessed.

Users can interact with the workflow instance in runtime at the earlier defined
breakpoints. The work ned breakpoints during the

elaboration of the job instances and suspends the execution. It then noti

ow interpreter detects the de

es the user
about the temporary suspension of the job instance. The user may decide separately
about the future of each suspended job instance by enabling or prohibiting its
progress. Moreover, the user may change the con

guration of the non-executed part

of the work ow after a global Suspend command issued in a “ break pointed ” state.

In order to submit work ows it is necessary to authenticate with the corre-

sponding certi cate. Grid and cloud authentication require username and password

or user proxies. 7

7

The authentication mechanism of gUSE is discussed in detail in Chap. 6 .