https://github.com/avh4/picocontainer-example

How to use PicoContainer with dynamically-created dependencies
https://github.com/avh4/picocontainer-example

Last synced: 8 days ago
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How to use PicoContainer with dynamically-created dependencies

• Host: GitHub
• URL: https://github.com/avh4/picocontainer-example
• Owner: avh4
• Created: 2013-08-10T19:45:19.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2013-08-10T21:07:30.000Z (over 11 years ago)
• Last Synced: 2024-10-27T12:06:14.927Z (about 2 months ago)
• Language: Java
• Size: 156 KB
• Stars: 4
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
## picocontainer-example

How to use [PicoContainer](http://picocontainer.codehaus.org/) with dynamically-created dependencies

[PicoContainer](http://picocontainer.codehaus.org/) is a [dependency-injection](http://www.martinfowler.com/articles/injection.html)

framework focused on simplicity.  It emphasizes constructor injection and has a simple configuration mechanism that does not require

annotations, in contrast to the popular alternative, [Guice](https://code.google.com/p/google-guice/).

One shortcoming of PicoContainer is that it does not provide clear documentation about how to approach writing code that needs to

dynamically create instances.  In Guice, this would be accomplished by injecting a `Provider` of the type you needed to dynamically

instantiate.

This project shows an example of a good pattern of doing this with PicoContainer.  The solution used here is to explicitly create a provider

class with has a `PicoContainer` injected into it.  If you follow this pattern, you should take care not to allow your non-provider classes to

inject the PicoContainer.

This project also demonstrated the flexible and loosely-coupled architecture that results from refactoring code to use constructor injection

in place of the `new` operator.  Notably `MainWindow` depends only on `ShowInfoWindowButton`: and as a result,

`ShowInfoWindowAction`, `InfoWindow`,  and `InfoWindowProvider` are completely hidden from it.

[Link to the relevant source folder](src/main/java/net/avh4/scratch/picocontainerexample)