Amir Rosen wrote: > > > -----Original Message----- > > From: Carsten Ziegeler [mailto:[EMAIL PROTECTED]] > > Sent: Wednesday, August 07, 2002 10:53 AM > > To: [EMAIL PROTECTED] > > Subject: RE: Cachable Readers > > > > Amir Rosen wrote: > > > > > > I'm using cocoon 2.0.3. > > > I'm writing a class extending AbstractReader, and > > implementing Cacheable. > > > When a Reader is used, the order the methods are called is: > > > getMimeType() > > > getLastModified() > > > generateValidity() > > > > > > Thus, getLastModified() & generateValidity() are called on the > > > new reader created, and not on the "right" reader that is known > > > only after the validity check. > > > > > > I hope i explained myself better this time. > > > > > Ok, now I got the first part, the order of the methods called, but > > what do you mean by "right" reader? > > > > Usually, when the first method is called (= getMimeType() ) the > > reader should collect all necessary information (mime type, > > last modified, > > validity etc.) and return only the mime type. When then the next > > method is called (= getLastModified() ), the previous collected > > information is returned etc. > > > > Does this make sense? > > > > Carsten > > > > By the "right" reader I mean the new reader or the cached reader, > choosen by the validity check. Sorry, I still don't get this. The reader is an Avalon component and there is excactly one per request. If you have a <map:read src="uri" type="xyz"/>, then one reader of the given type is instantiated and the methods are called on this one reader instance in the order you mention above.
If you have a look at the ResourceReader you can see how it works - this one component checks on each invokation if the requested source has changed. If so, the new source is served and if not a cached version is used. HTH Carsten > For performance reasons, I wouldn't want my new reader to collect > any unnecessary data, unless it is going to be used, which should > be check by the CacheValidity object. > Anyway, getLastModified() & getMimeType(), should be called on the > cached reader and not the new reader, if it's generate() is going > to be called. > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, email: [EMAIL PROTECTED]
