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Applied Modularity

Do we really need OSGi, Micro Services and the Java Module System?

Reik Oberrath

How can a book offer anything “applied” on an abstract topic such as modularity in software development? – Well, for instance, by runnable examples and code to play with, by comparing different approaches of modularity applied to the same business domain and by field reports from projects where modularity has been intensively applied.

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About the Book

This book offers a general introduction into modularity in software engineering. The main part, however, represents an overview of five different approaches to modularity from a practical point of view. An example business domain is used to explain how the different modularity approaches work. When comparing the different approaches, similarities, differences, benefits and disadvantages between them become visible. To all implementations of the example business domain mentioned in the book code is available for you at GitHub. The book refers to this code that enables you to view, run, modify and rerun the implementations in your IDE. Finally, some projects reports are presented that provide some insight on how to cope with typical problems that you may face on the different ways to modularity.

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Author

About the Author

Reik Oberrath

Geboren / Born in 1969

Nationalität: Deutsch / Citizenship: German

Promotion in Biologie / PhD in Biology 2000

Seit dem Softwareentwickler und Berater / Software Developer and Consultant until now

Seit 2014 Hobby Leanpub-Autor / Since 2014 Hobby Leanpub Author

Bisher Veröffentlicht / Published until now: 7 E-Books

Contents

Table of Contents

Preface

1. What modularity is

  1. 1.1 Why are many small pieces easier to maintain than one big one?
  2. 1.2 How small or big can a piece of software be?
  3. 1.3 How to structure pieces of software
  4. 1.4 How to cut software into pieces?
  5. 1.5 What kind of boundaries exist that separate pieces of software from each other?
  6. 1.6 How to set up impermeable boundaries?
  7. 1.7 What is modularity not good for?
  8. Chapter Summary

2. The example business domain HOO

  1. 2.1 Requirements
  2. 2.2 Implementation
  3. 2.3 The search for alternative ways to modularity

3. What OSGi is

  1. 3.1 How does OSGi work?
  2. 3.2 A real life OSGi example
  3. 3.3 The HOO service as OSGi application
  4. 3.4 What is OSGi good for?

4. What micro-services are

  1. 4.1 What is the relationship between SOA and micro-service architecture?
  2. 4.2 How do micro-services work?
  3. 4.3 A real life micro-service example
  4. 4.4 The HOO Service as micro-service system
  5. 4.5 What are micro-services good for?

5. What a modular monolith is

  1. 5.1 How does a classic monolith work?
  2. 5.2 How does a pseudo-modular monolith work?
  3. 5.3 How does a true modular monolith work?
  4. 5.4 How is a true modular monolith built?
  5. 5.5 A real life modular monolith example
  6. 5.6 The HOO service as ODDM modular monolith

6. What Java Modules are

  1. 6.1 How do Java Modules work?
  2. 6.2 The HOO service as a Java modulular monolith
  3. 6.3 What are Java Modules good for?

7. The HOO Service in Choreography Design

  1. 7.1 Choreography with micro-services
  2. 7.2 Choreography with OSGi
  3. 7.3 Choreography with ODDM
  4. 7.4 Choreography design with Java Modules
  5. 7.5 Asynchronuous communication

8. Comparing the different modularity approaches

  1. 8.1 Implementation Details
  2. 8.2 Dependency and Reference Types
  3. 8.3 The degree of module coupling
  4. 8.4 Costs and disadvantages
  5. 8.5 Dependency levels, dependency cycles and dependency hell
  6. 8.6 Asynchronous communication

9. Conclusions

  1. 9.1 Combining different modularity approaches
  2. 9.2 Orchestration versus Choreography
  3. 9.3 Transactionality and modularity
  4. 9.4 Domain Driven Design (DDD) and modularity
  5. 9.5 Towards a new modularity mind-set for developers
  6. 9.6 Different ways to achieve the same goal
  7. 9.7 How bad are monoliths?

Postface

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