Enabling service-level agreement renegotiation through extending WS-Agreement specification

Sharaf, Sanaa; Djemame, Karim

doi:10.1007/s11761-014-0159-5

Cited by 15 publications

(6 citation statements)

References 18 publications

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“…The renegotiation of SLA based on past partner behaviour, i.e., taking into account the trading history between partners, has been addressed by other authors like [1,2,3,5,6].…”

Section: Sla Renegotiationmentioning

confidence: 99%

“…They propose a WS-Agreement Negotiation protocol extension together with a finer detailed description of the SLO Guarantee Terms, including the specification of the scope of the changes which can be performed at run time. Similarly, Sharaf and Djemane (2015) [6] present another extension of the WS-Agreement specification to support SLA renegotiation. Consumers and providers must define the renegotiable terms or SLO of the SLA that could change during the SLA lifetime, resulting in new SLA negotiation states.…”

Section: Sla Renegotiationmentioning

confidence: 99%

“…Equation 6 calculates the brokerage fee discount where id is the business identifier, #rSLA is the total number of established rSLA, Cred(id) is the business credibility in the platform, Disc(id, t) is the partial discount based on the duration of the bSLA and Disc(id, #rSLA) is the partial discount based on the number of established rSLA.…”

Section: Renegotiation Of Brokerage Contractsmentioning

confidence: 99%

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Renegotiation of Electronic Brokerage Contracts

Cunha

Veloso

Malheiro

2017

Advances in Intelligent Systems and Computing

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CloudAnchor is a multiagent e-commerce platform which offers brokerage and resource trading services to Infrastructure as a Service (IaaS) providers and consumers. The access to these services requires the prior negotiation of Service Level Agreements (SLA) between the parties. In particular, the brokerage SLA (bSLA), which is mandatory for a business to have access to the platform, specifies the brokerage fee the business will pay every time it successfully trades a resource within the platform. However, while the negotiation of the resource SLA (rSLA) includes the uptime of the service, the brokerage SLA was negotiated for an unspecified time span. Since the commercial relationship -defined through the bSLA -between a business and the platform can be long lasting, it is essential for businesses to be able to renegotiate the bSLA terms, i.e., renegotiate the brokerage fee. To address this issue, we designed a bSLA renegotiation mechanism, which takes into account the duration of the bSLA as well as the past behaviour (trust) and success (transactions) of the business in the CloudAnchor platform. The results show that the implemented bSLA renegotiation mechanism privileges, first, the most reliable businesses, and, then, those with higher volume of transactions, ensuring that the most reliable businesses get the best brokerage fees and resource prices. The proposed renegotiation mechanism promotes the fulfilment of SLA by all parties and increases the satisfaction of the trustworthy businesses in the CloudAnchor platform.

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“…The renegotiation of SLA based on past partner behaviour, i.e., taking into account the trading history between partners, has been addressed by other authors like [1,2,3,5,6].…”

Section: Sla Renegotiationmentioning

confidence: 99%

Section: Sla Renegotiationmentioning

confidence: 99%

Section: Renegotiation Of Brokerage Contractsmentioning

confidence: 99%

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Renegotiation of Electronic Brokerage Contracts

Cunha

Veloso

Malheiro

2017

Advances in Intelligent Systems and Computing

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“…The pros and cons of the adoption of a REST architecture [13] are discussed in [16] and [17]. The extension of WS-Agreement to support renegotiation is instead discussed in [18].…”

Section: Related Workmentioning

confidence: 99%

REST-Based SLA Management for Cloud Applications

Benedictis

Rak

Turtur

et al. 2015

2015 IEEE 24th International Conference on Enabling Technologies: Infrastructure for Collaborative Enterprises

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In cloud computing, possible risks linked to availability, performance and security can be mitigated by the adoption of Service Level Agreements (SLAs) formally agreed upon by cloud service providers and their users.This paper presents the design of services for the management of cloud-oriented SLAs that hinge on the use of a RESTbased API. Such services can be easily integrated into existing cloud applications, platforms and infrastructures, in order to support SLA-based cloud services delivery.After a discussion on the SLA life-cycle, an agreement protocol state diagram is introduced. It takes explicitly into account negotiation, remediation and renegotiation issues, is compliant with all the active standards, and is compatible with the WS-Agreement standard.The requirement analysis and the design of a solution able to support the proposed SLA protocol is presented, introducing the REST API used. This API aims at being the basis for a framework to build SLA-based applications.

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“…The management of SLAs involves different tasks including SLA negotiation [15], renegotiation [16] [17], specification [18] [19], evaluation [20], testing [21], and monitoring [22]. Among these tasks, the testing of the SLAs has been identified as a challenge [23][24] [25].…”

Section: Introductionmentioning

confidence: 99%

Automatic test case generation for WS-Agreements using combinatorial testing

Palacios

García-Fanjul

Tuya

et al. 2015

Computer Standards & Interfaces

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent repository link AbstractIn the scope of the applications developed under the service-based paradigm, Service Level Agreements (SLAs) are a standard mechanism used to flexibly specify the Quality of Service (QoS) that must be delivered. These agreements contain the conditions negotiated between the service provider and consumers as well as the potential penalties derived from the violation of such conditions. In this context, it is important to assure that the service based application (SBA) behaves as expected in order to avoid potential consequences like penalties or dissatisfaction between the stakeholders that have negotiated and signed the SLA. In this article we address the testing of SLAs specified using the WS-Agreement standard by means of applying testing techniques such as the Classification Tree Method and Combinatorial Testing to generate test cases. From the content of the individual terms of the SLA, we identify situations that need to be tested. We also obtain a set of constraints based on the SLA specification and the behaviour of the SBA in order to guarantee the testability of the test cases. Furthermore, we define three different coverage strategies with the aim at grading the intensity of the tests. Finally, we have developed a tool named SLACT (SLA Combinatorial Testing) in order to automate the process and we have applied the whole approach to an eHealth case study.

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Enabling service-level agreement renegotiation through extending WS-Agreement specification

Cited by 15 publications

References 18 publications

Renegotiation of Electronic Brokerage Contracts

Renegotiation of Electronic Brokerage Contracts

REST-Based SLA Management for Cloud Applications

Automatic test case generation for WS-Agreements using combinatorial testing

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