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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] Created: (JCR-2498) Implement caching mechanism for ItemInfo batches
Date Tue, 16 Feb 2010 13:17:27 GMT
Implement caching mechanism for ItemInfo batches
------------------------------------------------

                 Key: JCR-2498
                 URL: https://issues.apache.org/jira/browse/JCR-2498
             Project: Jackrabbit Content Repository
          Issue Type: Improvement
          Components: jackrabbit-jcr2spi, jackrabbit-spi
            Reporter: Michael Dürig
            Assignee: Michael Dürig


Currently all ItemInfos returned by RepositoryService#getItemInfos are placed into the hierarchy
right away. For big batch sizes this is prohibitively expensive. The overhead is so great
(*), that it quickly outweighs the overhead of network round trips. Moreover, SPI implementations
usually choose the batch in a way determined by the backing persistence store and not by the
requirements of the consuming application on the JCR side. That is, many of the items in the
batch might never be actually needed. 

I suggest to implement a cache for ItemInfo batches. Conceptually such a cache would live
inside jcr2spi right above the SPI API. The actual implementation would be provided by SPI
implementations. This approach allows for fine tuning cache/batch sizes to a given persistence
store and network environment. This would also better separate different concerns: the purpose
of the existing item cache is to optimize for the requirement of the consumer of the JCR API
('the application'). The new ItemInfo cache is to optimize for the specific network environment
and backing persistence store. 

(*) Numbers follow 

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