TY  - JOUR
KW  - Service oriented computing; synchronized hyperedge replacement; quality of service; logic; c-semirings
SP  - 135
ID  - eprints161
Y1  - 2006///
JF  - Electronic Notes in Theoretical Computer Science
AV  - public
IS  - 2
UR  - http://www.sciencedirect.com/science/article/B75H1-4K07PMJ-8/2/0fcb616e2906ac0a6d2ad0f1dc3f0840
N1  - Proceedings of the Third Workshop on Quantitative Aspects of Programming Languages (QAPL 2005)
PB  - Elsevier
VL  - 153
SN  - 1571-0661
A1  - Hirsch, Dan
A1  - Lluch-Lafuente, Alberto
A1  - Tuosto, Emilio
N2  - Service Oriented Computing (SOC) has been proposed as a paradigm to describe computations of applications on wide area distributed systems. Awareness of Quality of Service (QoS) is emerging as a new exigency in both design and implementation of SOC applications.
We do not refer to QoS aspects related to low-level performance and focus on those high-level non-functional features perceived by end-users as application dependent requirements, e.g., the price of a given service, or the payment mode, or else the availability of a resource (e.g., a file in a given format).
In this paper we present a logic which includes mechanisms to consider the three main dimensions of systems, namely their structure, behaviour and QoS aspects. The evaluation of a formula is a value of a constraint-semiring and not just a boolean value expressing whether or not the formula holds. This permits to express not only topological and temporal properties but also QoS properties of systems.
The logic is interpreted on SHReQ, a formal framework for specifying systems that handles abstract high-level QoS aspects combining Synchronised Hyperedge Replacement with constraint-semirings.

EP  - 159
TI  - A logic for application level QoS
ER  -