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Eclipse Plug-in Development Beginner's Guide

You're reading from   Eclipse Plug-in Development Beginner's Guide Extend and customize Eclipse

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Product type Paperback
Published in Aug 2016
Publisher
ISBN-13 9781783980697
Length 458 pages
Edition 2nd Edition
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Author (1):
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Alex Blewitt Alex Blewitt
Author Profile Icon Alex Blewitt
Alex Blewitt
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Table of Contents (17) Chapters Close

Preface 1. Creating Your First Plug-in 2. Creating Views with SWT FREE CHAPTER 3. Creating JFace Viewers 4. Interacting with the User 5. Working with Preferences 6. Working with Resources 7. Creating Eclipse 4 Applications 8. Migrating to Eclipse 4.x 9. Styling Eclipse 4 Applications 10. Creating Features, Update Sites, Applications, and Products 11. Automated Testing of Plug-ins 12. Automated Builds with Tycho 13. Contributing to Eclipse A. Using OSGi Services to Dynamically Wire Applications B. Pop Quiz Answers Index

Dynamic services

The OSGi specification defines four different layers:

  • Security Layer: In this layer, all actions are checked against a security permissions model
  • Module Layer: In this layer, modules are specified as bundles that have dependencies
  • Life Cycle Layer: This layer bundles coming and going and firing events
  • Service Layer: In this layer, dynamic services that come and go

The Services layer allows bundles to communicate by defining an API that can cross bundle layers. However, the services layer also allows the services to come and go dynamically, instead of being fixed at runtime.

This mechanism allows services to be exported over a network, and since the network can come and go (as can the remote endpoint) the OSGi services layer can replicate that same functionality.

Responding to services dynamically coming and going may add a slight difficulty to the client code, but it will be more robust in case of failure. The following sections will present different ways of achieving dynamism...

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