![](bg8.png)
application, the ShoppingForce.com and two tenant-
specific virtual applications are also constructed to
demonstrate the feasibility of the service framework.
Moving ahead, further research is clearly required
to investigate approaches for enhancing the security
aspect of the proposed framework. Essentially, multi-
tenancy promotes resource sharing, which unavoid-
ably trades a certain amount of security for the lower
service costs. Fortunately, security issues caused by
resource sharing can be significantly reduced if the
multi-tenant SaaS application is deployed on a mid-
dleware platform that employs advanced access con-
trol and program monitoring mechanisms for inter-
cepting unauthorized accesses to a shared resource.
Hence we shall look into those mechanisms and in-
vestigate how to leverage them to prevent unautho-
rized data accesses, such as checking tenant ID’s. On
a different front, we are going to explore more trans-
parent ways, such as aspect-oriented programming or
dependency injection, to help developers transform a
single tenant enterprise application into a multi-tenant
one based on the proposed service framework with
less efforts.
ACKNOWLEDGEMENTS
This work is partially sponsored by Ministry of Sci-
ence and Technology, Taiwan, under grant 102-2221-
E-035-039 and 102-2627-E-002-001.
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