wiki:DynamicDatasources

Version 5 (modified by grimnes, 18 years ago) (diff)

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Adding new datasources to Gnowsis is easy, a new datasource needs to define at minimum three classes:

  1. A class implementing Aperture:DataSourceFactory
  2. A class implementing Aperture:CrawlerFactory a
  3. A class extending Gnowsis:ConfigPanel

The factory classes have to have constructors that take no parameters, so that we can instantiate them with class.newInstance().

Pack these classes up in a jar, write a sensible manifest and put them in ~/.gnowsis-beta/datasources

An example MANIFEST.MF:

Manifest-Version: 1.0
Created-By: 1.4.2_09 (Apple Computer, Inc.)
Gnowsis-DS-CrawlerFactory: org.gnowsis.data.datasource.rss.RSSCrawlerFactory
Gnowsis-DS-DataSourceFactory: org.gnowsis.data.datasource.rss.RSSDataSourceFactory
Gnowsis-DS-ConfigPanel: org.gnowsis.data.datasource.rss.RSSConfigPanel
Gnowsis-DS-Icon: /org/gnowsis/data/datasource/rss/rssicon.png
Gnowsis-DS-Label: RSS Datasource
Gnowsis-DS-Desc: A datasource for crawling RSS feeds.

Note that blank lines are not allowed.

!A quick guide to creating your own aperture datasource (in eclipse):

Here I will step through all the steps required to create a new aperture datasource and how to package it so that it can be used with gnowsis. I will create a datasource that wraps an RSS/Atom feed, and I will base it on rome.

  • Create a new Eclipse project, copy the main aperture jar (mine is aperture-2006.1-alpha-2.jar) and the 3 sesame jars into the project and add them to the build-path.
  • Create a new class that implements CrawlerFactory, tell Eclipse to add all unimplemented methods.
  • Create a new class that implements DataSourceFactory, add unimplemented methods.
  • Create a new class that extends DataSourceBase - create a public static URI called TYPE, and return this in the getType().
    public static URI TYPE=new URIImpl("http://example.org/RSSDataSource");
    
  • Create a new

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