Sunday, February 27, 2005

Planet Roller internals [Blogging] Permalink | Comments [2] I promised some details on PlanetTool (the command-line tool that generates Planet Roller) internals, so here goes. This is what happens when PlanetTool runs: Startup (1) We start by reading the XML configuration file (via JDOM and XPath) (2) From the config, we create a config object, subscriptions and groups (3) A group has subscriptions (4) And a subscription can belong to more than one group Refresh subscription data (5) For each subscription, call the Rome Fetcher (6) Fetcher uses Conditional Get and Etags and caches feeds on disk (7) Feeds parsed into entries objects and added to subscription objects File generation (8) Call Velocity Texen with name of a control template (9) Texen calls our control template (10) Control template calls file generation templates (11) Templates calls planet object to get config, group, subscription, and entry objects needed to generates files needed for aggregated site (HTML, RSS, OPML, etc.) 8:24:48 PM

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