It is kind of cashe implementation for simple store
At 01:09 PM 1/15/2002 +0100, you wrote:
>Hi Juozas,
>do you have interest to move your implemenation to my simplestore
>package?
>The only thing you have to do, is to replace your Store interface with
>my Store interface.
>
>I identify two objects we can need:
> your MemoryStore, maybe it needs a new name.
> your SynchronizedStore, that can we use for all our Stores.
>
>It would be kool to have it!
>
>What do you think?
>
>Greets
>
> Gerhard
>
>
>
>
>
>
> Juozas
> Baliuka
>
> <baliuka@mwm.l To: "Jakarta Commons
> Developers List"
> t>
> <commonsdev@jakarta.apache.org>
> cc:
>
> 15.01.2002 Subject: RE: [simplestore]
> inital check in
> 13:46
>
> Please
> respond
>
> to
> "Jakarta
>
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>
> Developers
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>
>Hi,
>This is cache implementation, it will not work if key has strong referense
>on value (or have bugs).
>There is a very simple test in MemoryStore main method.
>I send a correct implementation for SoftReferenceMap in commons collections
>a month ago, but it was forgot.
>It is possible to implement cache with Map interface and memory store can
>wrap this map (it will be more useful). Is it interesting for anybody ?
>
>output from test :
>
>operations ...
>1 removed from queue, size7
>2 removed from queue, size15
>3 removed from queue, size14
>4 removed from queue, size13
>5 removed from queue, size12
>6 removed from queue, size11
>7 removed from queue, size10
>8 removed from queue, size9
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>11 removed from queue, size15
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>23 removed from queue, size15
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>29 removed from queue, size15
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>iterating cache ...
>252
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>253
>0
>At 07:40 PM 1/14/2002 +0100, you wrote:
> >Juozas
> >
> > >Original Message
> > >From: Juozas Baliuka [mailto:baliuka@mwm.lt]
> > >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:baliuka@mwm.lt]
> > >> >
> > >> >>
> > >> >>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 memorysensitive 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)"
> > >>
> > >>
> > >>
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> > >
> > >
> > >
> > >
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> >
> >
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>#### SynchronizedStore.java has been removed from this note on January 15
>2002 by Gerhard Froehlich
>#### MemoryStore.java has been removed from this note on January 15 2002 by
>Gerhard Froehlich
>#### ObjectNotFoundException.java has been removed from this note on
>January 15 2002 by Gerhard Froehlich
>#### Store.java has been removed from this note on January 15 2002 by
>Gerhard Froehlich
>#### StoreException.java has been removed from this note on January 15 2002
>by Gerhard Froehlich
>#### DublicateKeyException.java has been removed from this note on January
>15 2002 by Gerhard Froehlich
>
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