Dynamic monitoring of composed services

Dynamic Monitoring of Composed

ServicesMuhammad Asim

School of Computing and Mathematical Sciences

Liverpool John Moores University

Agenda

Composed Services with Dynamic behavior? Aniketos Project BPMN with Activiti engine Proposed Framework Future Work Questions

Composed Services with Dynamic behavior? A composite service is an aggregation of

multiple sub-services or service components (Atomic or compositions themselves).

A fundamental concepts in Service Oriented Architectures (SOA).

SOAs allow software components from different providers to be exported as services for external use.

Composed Services with Dynamic behavior?Service descriptions (including both functional and non-functional properties) are published by service providers.

A service composer is responsible for constructing service compositions and offering them to consumers.

Service discovery is based on matching user requirements and security needs with the published service descriptions.

Composed Services with Dynamic behavior? Typically, service composers will have different needs

and different requirements.

It important to ensure that a service should deliver what it promises and should match the user’s expectations

However, SOA-based applications are highly dynamic and liable to change heavily at runtime.

Aniketos1 Project Aniketos project is an EU research project that

addresses trustworthy and secure service compositions with run-time monitoring and adaptation of services.

Among the challenges is the monitoring of services at runtime to ensure that services behave as promised.

The proposed monitoring framework that is based on the

runtime monitoring of a service to ensure that the service behaves in compliance with a pre-defined security policy.

1 Aniketos is a collaborative project funded under the EU 7th Research Framework Programme (FP7/2007-2013) under

grant no 257930

BPMN & Activiti engine BPMN used as a modelling notation for business process

BPMN transformation into BPEL (Business Process Execution Language) Result in ambiguities and unexpected result

BPMN 2.0 standard with Activiti engine

Provide a standard for both business process modelling and implementing a process execution model

Both business oriented people and developer speak with the same vocabulary

Avoid ambiguities

Proposed Monitoring Framework

BPMN Process

Execution Listener

Event Manager Analyzer

Monitoring Policy

Monitoring Rules Repository

Activiti Engine

Interface

Service Composer

Notification

Events

Proposed Monitoring Framework The Activiti engine with the help of Execution Listeners

throws events for the deployed BPMN process.

BPMN construct Event type Description

Process Start and end A start and end event of a process instance

Activity Start and end A start and end execution listener of an activity

Transition Take A transition execution listener can catch a take transition event

User task Create, assignment & complete

A user task throws events when the task assignment has been performed

Proposed Monitoring Framework Event Manager: This module gathers the events coming

from the Activiti engine and passes them to the Analyzer.

Monitoring policy: A set of requirements that specify

what to monitor for a particular BPMN process. ConSpec to specify the monitoring policy. A policy written in ConSpec is easily understandable by humans

and the simplicity of the language allows a comparatively simple semantics.

This will enable the service composer to easily specify the monitoring requirements for their processes and monitor them using this framework.

Proposed Monitoring Framework Monitoring Pattern Repository: Holds definitions for

monitoring patterns, which are predefined.

Analyzer: Upon receiving events from the Event Manager, it analyses them by accessing patterns from the repository. It uses the monitoring policy to select the appropriate monitoring patterns for a particular process.

Interface: This is used to specify definitions for monitoring patterns using monitoring IDs.

Notification Module: This is mainly used by the Analyzer to report any violations.

FUTURE WORK Implementation of our proposed framework for some real

life scenarios.

To integrate and implement the language ConSpec in our framework for specifying the monitoring policy.

Thank you Any Question / Suggestions / Comments ?