[infinispan-dev] Continuous Query Caching

[Mircea Markus]

Hi,

Again, this is a feature from Coherence[1].

Basic idea is to execute a query against the cache, and hold the  
result object. This result object will always have up to date query  
result; this means that whenever something is modified in the cache  
the result itself is updated. Advantage: if one performs the same  
query very often(e.g. several times every millisecond) the response  
will be fast and the system will not be overloaded.
E.g.
Filter filter = new AndFilter(new EqualsFilter("getTrader", traderid),
                               new EqualsFilter("getStatus",  
Status.OPEN));
ContinuousQueryCache cacheOpenTrades = new ContinuousQueryCache(cache,  
filter);

Iterator iter = cacheOpenTrades.entrySet().iterator(); //*this  
entrySet call will be instant!*

FOr a full list of scenario in which this can be used take a look at  
[1].
Shall we consider adding something similar?

Cheers,
Mircea


[1] http://download.oracle.com/docs/cd/E14526_01/coh.350/e14509/continuousquery.htm#BABBEIAH
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