Juozas >-----Original Message----- >From: Juozas Baliuka [mailto:[EMAIL PROTECTED]] >Sent: Monday, January 14, 2002 8:20 PM >To: Jakarta Commons Developers List >Subject: RE: [simplestore] inital check in > > >Hi, >I read documentation tested all Reference types today. >The problem exists, object is cleared before reference is queued. >There is no way to flush expired object to stable storage if it has no >strong references, >but you can solve it this way : >WRITE: >0. Test queue, clear pooled references. >1. write object . >2. Add internal strong and Weak reference, make it a "new". >3. Put weak reference to cache. >4. release strong internal references from "old" objects. >READ: >0. Test queue, clear pooled references. >1. Search in Cashe. >2. Load object, if not found. >3. Add internal strong and Weak references, make object a "new". >4. Put weak reference to Cashe. >5. Release strong internal references from "old" objects. >6. return object. > >No need for "background cleanup". >I can implement this kind of cache, if it interesting for some body. >I have some my cache implementations, but they are not very "common" :)
Kool, mate. How about a MRU based Memory Store which is implemented with week reference. We can call it SoftMRUMemoryStore or something else. Just send compilable code and I will check it in for you. Keep sending patches, it's valuable ;-). Stand by for patches Gerhard >At 05:28 PM 1/14/2002 +0100, you wrote: >>Juozas, >> >> >From: Juozas Baliuka [mailto:[EMAIL PROTECTED]] >> > >> >> >> >>StoreJanitorImpl: you can register your Memory Stores in >> >>this class. A background Thread checks if memory running >> >>slow in you JVM and if yes it frees some objects out of the >> >>registered Stores. >> > >> >Hi, >> >I think it is better to use java.lang.ref.* to solve problems related to >> >memory management. >> >Application threads are not permitted in EJB container and I believe GC >> >will do it better. >> > >> >It is from JDK documentation : >> >"Soft reference objects, which are cleared at the discretion of the garbage >> >collector in response to memory demand. Soft references are most often used >> >to implement memory-sensitive caches. " >> >>Aha, it's a shame but I never looked into this. But I do it right now! >>Does anybody(you) have experiences with this soft references and >>how to use them? >> >>Yes I know RTFM ;-)! >> >> Gerhard >> >>"A man with one watch knows what time it is, >>a man with two watches is never sure... >>(Albert Einstein)" >> >> >>-- >>To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> >>For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> > > > >-- >To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> >For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> > > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
