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Swing & OSGi - Devoxx 09

by Angelo van der Sijpt on Nov 18, 2009

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At Devoxx 09, Xander Tamminga and I told the tale of the perils in using Swing in an OSGi-based application. The details can be found at http://lsd.luminis.nl/swing-and-osgi .

At Devoxx 09, Xander Tamminga and I told the tale of the perils in using Swing in an OSGi-based application. The details can be found at http://lsd.luminis.nl/swing-and-osgi .

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You have a window with a table in it. The table is created before the window sets its look and feel; you need to restart the table-providing bundle before the table’s look and feel is correct.
Even worse: two menu’s with different look and feel’s in a single window.
A table gets put into a scrollpane _before_ this scrollpane is part of the AWT hierarchy; hence, a NPE.
(The ColumnHeader only gets created when the scrollpane receives a ‘notify’ from the window)
A table gets put into a scrollpane _before_ this scrollpane is part of the AWT hierarchy; hence, a NPE.
(The ColumnHeader only gets created when the scrollpane receives a ‘notify’ from the window)
How do we create an OSGi-aware Swing application anyway?
- Startlevels are about all bundles; besides, the NPE before cannot be solved by this.
We start out with an application with consisting of a host and nested children.
We use OSGi to resolve our services.
Host -> Childeren -> and their Childeren

finally, all components can initialize themselves.
Since every component now uses the same service interface, we add some service properties to keep them separate; we could also use subclasses of ComponentProvider
The ComponentProvider is a very simple interfaces, which separates these three steps.
- Some dependency management mechanism makes this easier, since we rely on service resolution (the Apache Felix Dependency Manager has been used successfully in the past)
- Application composition is determined at application start.
- So, don’t create your components on a framework thread

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Rosthum 2 years ago

Swing & OSGi - Devoxx 09 — Presentation Transcript

Swing and OSGi - please play nice by Angelo van der Sijpt / Xander Tamminga
Has this ever happened to you? www.devoxx.com
Has this ever happened to you? www.devoxx.com
Has this ever happened to you? www.devoxx.com
Has this ever happened to you? www.devoxx.com
Has this ever happened to you? www.devoxx.com
Has this ever happened to you? www.devoxx.com
www.devoxx.com Swing & OSGi
Why’s that? Different design philosophies & assumptions OSGi is dynamic by deﬁnition Swing is built to be static www.devoxx.com
How to ﬁx that? Startlevels Which may have more impact than desired May not even solve the problem All UI in a single bundle But we don’t want that! www.devoxx.com
How to really ﬁx that? www.devoxx.com
How to really ﬁx that? www.devoxx.com
How to really ﬁx that? www.devoxx.com
How to really ﬁx that? www.devoxx.com
The ComponentProvider www.devoxx.com
The ComponentProvider www.devoxx.com
Notes The problem gets worse with complexity Dependency management helps You give up ﬂexibility at runtime Remember to use the EDT correctly www.devoxx.com
That’s it! See the Luminis LSD blog for details and code http://lsd.luminis.nl/swing-and-osgi www.devoxx.com