Service Level Agreements (SLAs) represent service management contracts that are processed by monitoring and measurement mechanisms for the evaluation of the signatories adherence to the agreed service levels during service execution. The paper discusses SLA data management characteristics that need to be considered in the design of data models for SLA documents. The SLA anatomy is introduced with respect to the Web Service Level Agreement (WSLA) [1] language specification. Furthermore, the paper highlights current obstacles for the integration of automated SLA management in the cloud business setting. The contributed SLA data analysis maps SLA terms to data management attributes according to their operational relevance during the SLA activity. We present an SLA digraph model for the automated SLA formulation and data handling. The SLA digraph is introduced as a programming module that sits on the application layer and communicates with backend data stores for the SLA persistence
The HypcrNews project aims at developing a hypermedia electronic newspaper system, based on agent technology. that will help the reader~ reduce time spent searching for relevant information and enable information providers to commercialize hypermedia electronic news articles in u:m1s similar to those of printed newspapers. Tue systl!m enforces eopynght control and payment on a ••pay per use" basis. More1.>vcr. MyperNews will establish intra-and cross-newspapcr hypcrlinks according to the interests of the reader and present the information consumer a personalized hyp1mnedia electronic newspaper through a Java-based World-Wide Web browser. The infom1ation consumers and providers run an agent execution platform on which the different components of the Hyper-News sys(em execute il$ software agents. The mobile agents are used to encapsulate the data in HyperNews anicle agents and to update specific solhvare agents bound to the infonnation providers. The resulting article agents can be distribuLed and duplicared at will since the access to the content is bound to the payment.
Cloud computing has given rise to on-demand service provisioning and massive outsourcing of IT infrastructures and applications to virtual, commoditized ones. Despite the broad Service Level Agreement (SLA) usage in scientific settings, their role in cloud markets is peripheral and misinterpreted. The paper introduces a SLA graph data model that supports automated SLA formalization and data management through a property digraph. The data model is described as a directed graph (digraph). We elaborate on node and edge properties that indicate dependencies in the SLA data management flow. We sketch a realistic scenario of cloud data service provisioning to extract attributes that characterize the data service. The SLA graph model and data service attributes are used to demonstrate the formalization of a SLA template that is managed as a property graph. The graph structure enables the manipulation of SLA information in a modular, extensible way that considers the data flow and all inclusive data dependencies
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