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[FreeMarker-user] Removing templates manually from a cache.

Frank Zeyda

2011-12-14

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Dear FreeMarker Developers,

Here's a small problem I encountered when using a MultiTemplateLoader that
first loads templates from the file store, and via a second
StringTemplateLoader allows for creation and use of on-the-fly templates while
the program executes. The reason for using a common loader is
intentional so that the on-the-fly templates can include those from the
file store where needed.

My problem is that I reuse the same name for the on-the-fly templates when
inserting them i.e. using the StringTemplateLoader method (putTemplate(...)).
This does not seem to cause the template to be reloaded unless one clears the
entire cache using clearTemplateCache() of the TemplateCache object. This,
however, appears to be inefficient as I suppose it would cause all templates
previously cached to be reloaded. setDelay() is not much use since I need the
one template to be reloaded immediately. To solve the problem, I tried to create
and set my own CacheStore, however, the methods get(...), put(...) and
remove(...) are of not much use here since one has no public access to the
object that is used as the key in the underlying map (TemplateCache.TemplateKey
is private).

So, to summarise, the solution to the above problem via clearTemplateCache()
seems to be not entirely satisfactory. Instead one may wish to have finer
control about the caches, for instance, in order to remove specific entries
manually; possibly via a method in TemplateCache, or by way of exposing
TemplateCache.TemplateKey so that keys can be created by the user.

Many thanks for any comments, in particular in case I am missing a simpler
solution.

Best wishes
Frank


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