Just to push to the limit.
Lets say we saved/serializer the cache to a secondary storage (file or
ZooKeeper).
What happen when the cache is restored?
I mean TTL is still honored? expired data while been sleeping will be
evicted upon an operation is performed after deserialization?
Thanks a lot!
On Tuesday, October 23, 2012 1:42:28 AM UTC+3, Sean Corfield wrote:
>
> On Mon, Oct 22, 2012 at 3:30 PM, Hussein B. <hubag...@gmail.com<javascript:>>
> wrote:
> > So we need to call evict explicitly if we want to remove an entry? no
> > automatic deletion after expiring?
>
> The cache is immutable.
>
> When you call hit / miss, you get a new instance of the cache with the
> expired entries removed, and the hit entry updated (if appropriate) or
> the miss entry added.
>
> That new instance needs to be stored somewhere (or passed to future
> code execution).
>
> Entries will be automatically deleted after expiring in any new
> instance of the cache - returned by hit / miss.
>
> You can see that here:
>
> user=> (swap! c3 hit-or-miss :a 1)
> {:a 1}
> user=> (swap! c3 hit-or-miss :b 2)
> {:a 1, :b 2}
> user=> (swap! c3 hit-or-miss :c 3)
> {:c 3, :b 2}
> user=> (swap! c3 hit-or-miss :d 4)
> {:c 3, :d 4}
> user=> (swap! c3 hit-or-miss :e 5)
> {:c 3, :d 4, :e 5}
>
> We add :a, then :b. By the time we add :c, :a has expired (and been
> removed). By the time we add :d, :b has expired (and been removed).
> Then we add :e before any more expiries. If I wait awhile and add a
> new value for :a...
>
> user=> (swap! c3 hit-or-miss :a 6)
> {:a 6}
>
> ...you'll see :c, :d and :e have expired.
> --
> Sean A Corfield -- (904) 302-SEAN
> An Architect's View -- http://corfield.org/
> World Singles, LLC. -- http://worldsingles.com/
>
> "Perfection is the enemy of the good."
> -- Gustave Flaubert, French realist novelist (1821-1880)
>
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