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Integration of Services into Workflow Applications
book

Integration of Services into Workflow Applications

by Pawel Czarnul
June 2015
Intermediate to advanced content levelIntermediate to advanced
290 pages
7h 37m
English
Chapman and Hall/CRC
Content preview from Integration of Services into Workflow Applications
Workflow Scheduling Algorithms 91
and forcing each d
in
ij
to be either 0 or d
i
. This can be done by introducing an
additional variable b
ij
Z for each service s
ij
that defines whether service s
ij
has been activated or not:
b
ij
=
0 if d
in
ij
= 0
1 if d
in
ij
= d
i
.
(4.8)
Since only one service s
ij
per task t
i
can be selected, the following needs to
hold true:
i
X
j
b
ij
= 1. (4.9)
Then, large enough constants U
ij
can be introduced such that:
d
in
ij
b
ij
U
ij
. (4.10)
If b
ij
= 0, then corresponding d
in
ij
= 0. For the given i and exactly one k
b
ik
= 1 which, along with equation 4.7, will force d
in
ik
= d
i
.
The same strategy can be applied for output data with the same b
ij
s
variables.
d
out
i
=
X
j
d
out
ij
(4.11)
Consequently, the execution time of service s
ij
can be modeled as:
t
exec
ij
= f
exec
ij
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Publisher Resources

ISBN: 9781498706469