Re: In 2.3.19, sharing cache storage

The problem with the approach is that Template-s are bound to a
Configuration instance (they store a reference to it), and sometimes
may reach back to it during template execution. However, can't you
just use a common Configuration instance on all those places that
share templates?

(Out of curiosity... what's the modification in 2.3.19 is about?)

-- 
Thanks,
 Daniel Dekany

Wednesday, July 23, 2014, 5:51:52 PM, Jaime Garza wrote:

> Hi Daniel,
>
> I am trying to share an instance of MruCacheStorage across threads.
> I keep it around across multiple threads and when creating my
> Configuration, I simply do a Configuration#setCacheStorage(). This
> internally calls Configuration#createTemplateCache, which calls
> cache.setConfiguration(this), which calls TemplateCache#clear(),
> which eventually clears the storage.
>
> My use case is that I know that a set of around 200 threads will be
> accessing the same templates over and over (executing the same
> template(s) on a different root namespace) concurrently. I want the
> loading of templates to happen as infrequently as possible. Also,
> since I am on a slightly customized version of 2.3.19, I cannot come to the greatest new version.
>
> The question (or questions) is: is there a way to implement my
> strategy? My current workaround is nasty. I have created a subclass
> of MruCacheStorage, which reads a flag "canClear" from thread local,
> and then decides whether to let the clear proceed or not. I
> sandwitched the call to setCacheStorage() with canClear = false and canClear = true
>
>         SharedCacheSettings.disallowClear();
>         config.setCacheStorage(storage);
>         SharedCacheSettings.allowClear();
>
> AND 
>
> public class SharedCacheStorage extends MruCacheStorage {
>     public SharedCacheStorage(int maxStrongSize, int maxSoftSize) {
>         super(maxStrongSize, maxSoftSize);
>     }
>     
>     @Override
>     public void clear() {
>         if (!SharedCacheSettings.canClear())
>             return;
>         
>         super.clear();
>     }
> }
>
> What is your opinion about my hack? What kind of trouble am I inviting?
>
> Thanks in advance.
> Jaime Garza


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