1. Dynamic Monitoring of
Composed Services
Muhammad Asim
School of Computing and Mathematical Sciences
Liverpool John Moores University

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

3. 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.

4. Composed Services with Dynamic
behavior?
Service descriptions (including both functional and non-
A service composer is responsible for constructing service
Service discovery is based on matching user requirements

5. 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.

6. 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

7. 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

8. Proposed Monitoring Framework
Interface Monitoring Rules
Repository
Events
BPMN Execution Event
Process Listener Analyzer
Manager
Activiti Engine
Monitoring
Policy
Service
Composer
Notification

9. 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 & A user task throws events when the task assignment has
complete been performed

10. 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.

11. 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.

12. 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.

13. Thank you
 Any Question / Suggestions / Comments ?