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From Reinhard Poetz <>
Subject [blocks] Implementation questions
Date Sun, 20 Jun 2004 15:03:47 GMT

IIUC the only component in Cocoon that knows about blocks is the 
BlockManager. It gets its information from wiring.xml (read only for the 
BlockManager) and a "watchdog" notices changes and notifies the 
BlockManager that it has to (re)load blocks.

The "component" which is responsible for changing this wiring.xml is the 
BlockDeployer. It has read/write-access to wiring.xml.

 - Is it correct that the "contract" between BlockDeployer and BlockManager
   is "wiring.xml" and _nothing_ else?
 - So the only way of changing the wiring is directly via the
   filesystem. If we need remote access we could provide a small server
   application that is completly independ from Cocoon. This server app
   provides (web) services to configure a server app. Could this be a 

 - After the BlockDeployer did all the necessary things like loading a 
COB from
   a repository, unpacking it into 
/WEB-INF/blocks/[some-autogenerated-ID] and
   changing the wiring.xml, the watchdog registers the change and notifies
   the BlockManager. The BlockManager reloads the application and does all
   the complicated (magic) classloader stuff + much more.

   * Am I correct that we have to make sure only one person uses a 
     tool and changes wiring.xml?
     Maybe by using a temporary locking file?

   * How is it possible to uninstall a block? How does the BlockDeployer 
     whether it can (physically) delete a previously installed block
     because it is not used any more by the BlockManager?


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