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Comprehensive Explanation of SLA Violations at
Runtime
Abstract
Service Level Agreements (SLAs) establish the Quality of Service (QoS) agreed between
service-based systems consumers and providers. Since the violation of such SLAs may involve
penalties, quality assurance techniques have been developed to supervise the SLAs fulfillment at
runtime. However, existing proposals present some drawbacks: 1) the SLAs they support are not
expressive enough to model real-world scenarios, 2) they couple the monitoring configuration to
a given SLA specification, 3) the explanations of the violations are difficult to understand and
even potentially inaccurate, 4) some proposals either do not provide an architecture, or present
low cohesion within their elements. In this paper, we propose a comprehensive solution,from a
conceptual reference model to its design and implementation, that overcomes these drawbacks.
The resulting platform, SALMonADA, receives the SLA agreed between the parties as input and
reports timely and comprehensive explanations of SLA violations. SALMonADA performs an
automated monitoring configuration and it analyses highly expressive SLAs by means of a
constraint satisfaction problems based technique. We have evaluated the impact of
SALMonADA over the resulting service consumption time performance. The results are
satisfactory enough to consider SALMonADA for SLA supervision because of its low
intrusiveness.
Existing System:
Service Level Agreements (SLAs) establish the Quality of Service (QoS) agreed between
service-based systems consumers and providers. Since the violation of such SLAs may involve
penalties, quality assurance techniques have been developed to supervise the SLAs fulfillment at
runtime. However, existing proposals present some drawbacks: 1) the SLAs they support are not
expressive enough to model real-world scenarios, 2) they couple the monitoring configuration to
a given SLA specification, 3) the explanations of the violations are difficult to understand and
even potentially inaccurate, 4) some proposals either do not provide an architecture, or present
low cohesion within their elements.

2. Proposed System:
In this paper, we propose a comprehensive solution,from a conceptual reference model to its
design and implementation, that overcomes these drawbacks. The resulting platform,
SALMonADA, receives the SLA agreed between the parties as input and reports timely and
comprehensive explanations of SLA violations. SALMonADA performs an automated
monitoring configuration and it analyses highly expressive SLAs by means of a constraint
satisfaction problems based technique. We have evaluated the impact of SALMonADA over the
resulting service consumption time performance. The results are satisfactory enough to consider
SALMonADA for SLA supervision because of its low intrusiveness.
SYSTEM CONFIGURATION:-
HARDWARE CONFIGURATION:-
 Processor - Pentium –IV
 Speed - 1.1 Ghz
 RAM - 256 MB(min)
 Hard Disk - 20 GB
 Key Board - Standard Windows Keyboard
 Mouse - Two or Three Button Mouse
 Monitor - SVGA
SOFTWARE CONFIGURATION:-
 Operating System : Windows XP

3.  Programming Language : JAVA
 Java Version : JDK 1.6 & above.