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Mastering Eclipse Plug-in Development
Mastering Eclipse Plug-in Development

Mastering Eclipse Plug-in Development: Build modular applications on Eclipse by defining custom extension points and using OSGi services

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Profile Icon Alex Blewitt Profile Icon Bandlem Limited
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€41.99
Full star icon Full star icon Full star icon Full star icon Empty star icon 4 (1 Ratings)
Paperback Aug 2014 362 pages 1st Edition
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€41.99
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Arrow left icon
Profile Icon Alex Blewitt Profile Icon Bandlem Limited
Arrow right icon
€41.99
Full star icon Full star icon Full star icon Full star icon Empty star icon 4 (1 Ratings)
Paperback Aug 2014 362 pages 1st Edition
eBook
€8.99 €32.99
Paperback
€41.99
Subscription
Free Trial
Renews at €18.99p/m
eBook
€8.99 €32.99
Paperback
€41.99
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Renews at €18.99p/m

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Mastering Eclipse Plug-in Development

Chapter 2. Creating Custom Extension Points

Eclipse is extended through the use of extension points and the extension registry. The registry manages a list of extension points and a list of extensions. Although it is commonly used in OSGi runtimes such as Eclipse, the extension registry can be used outside of an OSGi runtime as well.

Extensions and extension points


The first thing to understand in the registry is the terminology. An extension is a contributed functionality that is often found in the plugin.xml file as an <extension> element. The extension itself provides some configuration or customization that can be processed appropriately. An extension is like a USB device, such as a mouse or keyboard. For example, the new feed wizard was added as an extension in the previous chapter:

<extension point="org.eclipse.ui.newWizards">
  <category name="Feeds" id="com.packtpub.e4.advanced.feeds.ui.category"/>
</extension>

An extension point defines the contract of an extension, along with any required arguments or attributes that an extension must provide. An extension point is like a USB hub that allows extensions (USB devices) to be plugged in. For example, the newWizards extension point is defined in the plugin.xml file of the org.eclipse.ui plug-in as follows:

<extension-point id="newWizards...

Summary


In this chapter, we looked at the Eclipse extension registry and how it can be used by programs to load extensions, as well as how to define extension points for others to extend. We learned how to sort elements in a way that does not rely on the order of the data in the plugin.xml files and how to perform simple definitions and validations with the associated schema.

The extension registry can also be used to customize different instances of extensions, and we looked at both of the ways in which this is done in Eclipse—with executable extensions and with extension factories (for classes whose inheritance hierarchy cannot be modified).

Finally, we looked at how the registry can be used outside of an OSGi runtime, which permits application code to be well behaved both inside and outside of OSGi.

In the next chapter, we will look at how similar extensions can be achieved with OSGi services.

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Description

Mastering Eclipse Plug-in Development shows you how to build an extensible application using custom extension points and dynamic OSGi services in Eclipse. Dynamic design patterns such as whiteboard and extender are covered along with specific techniques to deal with native and legacy code. This book dives right into the details and teaches you how to define new JFace wizards and extend Eclipse with custom extension points. Then the book moves quickly on to the details of how to define new commands for the Eclipse console and how to include native code in a plug-in. You will engage with modular application design patterns and Thread Context ClassLoaders before getting the details on how to create as well as manage P2 sites and write help documentation for an Eclipse plug-in.

What you will learn

  • Create a custom extension point to allow other plugins to contribute
  • Employ Declarative Services and Blueprint for dynamic OSGi contributions
  • Extend the Common Navigator Framework to provide nested content
  • Build commands to extend the builtin Gogo shell
  • Use fragments to contribute native code to plugins
  • Fix code using the service loader and wrap nonOSGifriendly JARs
  • Discover how to build modular applications with decoupled design patterns
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Publication date : Aug 26, 2014
Length: 362 pages
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Language : English
ISBN-13 : 9781783287796
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Table of Contents

10 Chapters
Plugging in to JFace and the Common Navigator Framework Chevron down icon Chevron up icon
Creating Custom Extension Points Chevron down icon Chevron up icon
Using OSGi Services to Dynamically Wire Applications Chevron down icon Chevron up icon
Using the Gogo Shell and Commands Chevron down icon Chevron up icon
Native Code and Fragment Bundles Chevron down icon Chevron up icon
Understanding ClassLoaders Chevron down icon Chevron up icon
Designing Modular Applications Chevron down icon Chevron up icon
Event-driven Applications with EventAdmin Chevron down icon Chevron up icon
Deploying and Updating with P2 Chevron down icon Chevron up icon
User Assistance in Eclipse Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
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W Boudville Dec 07, 2014
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Hmm. The book came out in August 2014. Strange that no reviews have been posted by now (Dec 2014), so I will try to remedy the situation.Eclipse is perhaps the most common development environment for java programming. Blewitt shows the latest developments in its support for adding plug-ins. A good aspect of the book is that it jumps right in. You are expected to be already using Eclipse and hopefully have written some prior plug-ins.Chapter 2 has a long discussion about how the classpath is used. As a practical matter, complexity and bugs can arise from problems with the elements (jar files) listed in the classpath. This is not restricted to programming with Eclipse. But the chapter delves into the details of, for example, the loading of all extensions via the classpath. To this ends, you might also check out chapter 6, which is a companion description of class loaders. Historically, this was the crucial idea that drove the very successful use of java inside enterprise computing on the Internet in the dot com years. You can now see here what the latest features of the class loader can do for your code.The text also goes into OSGi services and runtime. For dynamically hooking up your executable to existing services.Another useful feature is the Gogo shell and a console view, where the latter comes with Eclipse. Likely, you have run the console to see output from your programs. But the text shows how other consoles can be invoked, with various advantages for each.Throughout the book are many code snippets and examples of running programs from a console or terminal window. Useful guidance.
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