Apache Felix iPOJO Online Manipulator¶
iPOJO generally requires an additional packaging step to prepare the bundle to be managed by iPOJO. Despite this step doesn't change the class semantic, it can be a little annoying. The online manipulator avoids this offline step!
iPOJO is based on a bytecode manipulation. This manipulate is safe and does not change the class semantics. Classes can still used after the manipulation without iPOJO. However this manipulation is required for iPOJO management. Generally, this manipulation occurs offline during the packaging time. The online manipulator allows to do this manipulation at install time.
The online manipulator:
- avoids offline manipulation
- supports annotations
- supports XSD schema
This is quite useful if you don't want to add an extra packaging step, and provides the same capabilities as the "regular" way.
The online-manipulator is in fact an URL Handler. So, it will process every bundle using a special URL prefix. To use it, just follows the below instructions:
Install and Start the URL Handler¶
Download and install the iPOJO online manipulator. You can download it from the Felix download page
Install a bundle using the ipojo: URL prefix¶
Using the handler is quite easy. When you want to deploy a non-manipulated iPOJO bundle just use an url like
The complete URL syntax is
When using the
ipojo: prefix, the OSGi platform delegates the loading to the url handler manipulating the bundle before its installation. This manipulation is exactly the same as the offline manipulation.
Dealing with metadata¶
If the installed bundle contains a
metadata.xml file either in its root or in the
META-INF directory, the online manipulator will use it. However, you can also provide an external
metadata.xml file by indicating the url of the file like in
If you provide such url, it will override the contained