www.s-cube-network.eu

Maryam Razavian, Patricia Lago VU University Amsterdam (VUA)

S-Cube Learning Package

SOA Migration: Study of Theory and Practice

Learning Package Categorization

S-Cube

Engineering Principles, Techniques & Methodologies

Designing and Migrating Service-Based Applications

SOA Migration

Learning Package Overview

§ Problem Description

§ What do we know in academia

– Systematic Review

§ What do we know in industry –  Industrial Survey

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Migration of Legacy Systems to SOA

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Migrate

Pre-existing enterprise assets

Service-based Systems

SOA Migration: Problem areas

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What to do? What activities

How to do? What process

What knowledge? What are the inputs and

outputs

SOA Migration

These problem areas are introduced in [1]

Understanding SOA Migration using a Framework

6 This framework called SOA-MF is presented in [2].

SOA-MF: Positioning and Categorizing

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Approach A Approach B

Learning Package Overview

§  Introduction on SOA Migration

§ What do we know in academia – Systematic Review

§ What do we know in industry –  Industrial Survey

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What SOA migration entails in theory

Goal: What types of SOA migration exist in the field?

§  Research Method: Systematic Literature Review

Why?

– Methodological rigor in aggregating existing SOA migration approaches

– Minimizing the bias in review process à extraction of sound migration categories

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The details related to systematic review is published in [3]

Systematic Review Process Stages

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Planning

the review

Conducting the review

Reporting the review

Research Questions

Search Process

Selection of

Primary Studies

RQ) What methods/processes/approaches regarding legacy to SOA migration, have been proposed in research community so far?

Review Protocol

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Search Process

Selection of

Primary Studies

1.  Search Query: ( migration OR …[ related terms]) AND (legacy system OR …) AND ( SOA OR …)

2.  Data Sources: digital libraries (IEEE Explore, ACM digital library, ISI …)

3.  Search Scope: titles and abstracts

Planning

the review

Research Questions

Related Terms for the Keywords

SOA Legacy Migration service oriented architecture legacy code modernization service computing legacy system transformation service-based existing system reengineering service-centric existing code migrate

service engineering existing asset

Service oriented software engineering

pre-existing code

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("SOSE" OR "SOA" <or> "service computing" <or>"service based" <or> "service centric" <or>"service engineering" <or>"service oriented " <or> "service oriented architecture" <or> "service oriented software engineering" or "service") AND ("legacy" <or> "legacy code" <or>"legacy system" <or>"existing system" <or>"legacy component" <or> "existing code" <or>" existing asset" <or>"existing component" <or>"pre-existing code" <or>"pre-existing system" <or>"pre-existing component") <and>("migrate" <or> "migration" <or>"modernization" OR "transformation" <or>"reengineering") <and> (pyr >= 2000 <and> pyr <= 2009)

Search Query

Review Protocol

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Search Process

Selection of

Primary Studies

Planning

the review

Research Questions

Inclusion Criteria:

I1) A study that is about migration to services

I2) A study that addresses migration from pre-existing legacy assets

I3) A study that proposes a solution for migration

Review Results

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Conducting the review

51 Primary Studies

Distribution of primary studies published by year

Qualitative Data Analysis

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Qualitative Data Analysis: Coding to achieve mapping on SOA-MF

8 families of SOA Migration

a) b) c) d)

F1)

F2)

F3)

F4)

F5)

F6)

F7)

F8)

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Service Identification Family

Forward Engineering with Design Element Transformation Family

What do the families imply?

1.  What are general types of solution in this family?

2.  To what extent the reverse engineering, transformation and forward engineering occurs?

3.  What activities are carried out?

4.  What artifacts are used and produced? 18

How does it help?

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What to do? What activities

How to do? What process

What knowledge? What are inputs and

outputs

SOA Migration

Goal: identifying the

activities that should be

covered in the migration

• What legs do I

need?

• What is the

closest family?

What types of knowledge shape SOA migration?

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Code-related Knowledge

What types of knowledge shape SOA migration?

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Design-related Knowledge

What types of knowledge shape SOA migration?

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Problem-related Knowledge

How does it help?

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What to do? What activities

How to do? What process

What knowledge? What are inputs and

outputs

SOA Migration

SOA Migration Themes

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Two different sequencing of activities

SOA Migration Themes

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Arch-shaped approaches Bowl-shaped approaches

Migration for Modernization: renovate existing system to reconstitute it in new form

65%

Migration for reuse in service-based development: facilitating reuse in building new service-based systems

35%

How does it help?

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What to do? What activities

How to do? What process

What knowledge? What are inputs and

outputs

SOA Migration

Learning Package Overview

§  Introduction on SOA Migration

§ What do we know in academia – Systematic Review

§ What do we know in industry – Industrial Survey

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What SOA Migration entails in Practice?

Study: What Type of SOA Migration are You?

§  6 different leading companies in SOA solutions participated

– SOA Migration Projects (both consultancy and in house)

–  9 interviews with senior architects (1 hour)

– Both enterprise and technical architects

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The details related to systematic review is published in [4,5]

What Families Occur in Practice

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SOA Migration Themes - Practice

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Bowl-shaped approaches

SOA Migration Themes - Practice

1. Migration for Reuse: I want to modernize my current system to SOA

2. Migration for Integration: I want to integrate my existing applications using SOA technology

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+

Understanding existing business processes

Temporary wrapping existing assets

+

Wrapping the whole application (or segments)

SO analysis and design drives integration

What did we Learn?

1.  All bowl-shaped

2.  Forward Engineering leg is covered

3.  Focus on top most transformation level

1.  Transformation at different levels: Enterprise Architecture Transformation, Business Process Transformation

4.  Incremental SOA Migration

5.  Enterprise architecture drives SOA Migration

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Systematic Review What we know of SOA migration in the literature

Industrial Survey: What are the main types of migration in practice, What is different

Summary

References

[1] M.Razavian, D.K.Nguyen, P.Lago, Willem-Jan van den Heuvel, The SAPIENSA Approach for

Service-enabling Pre-existing Legacy Assets,International Workshop on SOA Migration and

Evolution 2010 (SOAME 2010), 2010, OFFIS

[2] M. Razavian and P.Lago, Towards a conceptual framework for legacy to SOA migration, 5th

International Workshop on Engineering Service Oriented Applications (WESOA) at ICSOC, 2009,

pp. 15.

[3] M. Razavian, P. Lago, A frame of reference for SOA migration, Springer LNCS 6481,

Servicewave , 2010.

[4] M. Razavian and P. Lago, A survey of SOA migration in industry, in International Conference on

Service Oriented Computing, ICSOC, 2011.

[5] M. Razavian and P.Lago , A lean and mean SOA migration strategy, Under submission, 2012, p.

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