Write through and CacheStore

Hi,
     I'm running a near cache implementation, with the front being a local cache and the back being a distributed cache. The distributed cache has a local cache and a read-write-backing-map-scheme for persisting each cache to disk every t minutes (for backup purposes - we still use a cache in memory).
     I have a few questions about the Write through capabilities and CacheStore so as to better understand what's going on here:
     1. We only need to store the data to disk for backup in case of complete cluster failure (for example, all n machines in our cluster go down). Right now my implementation of the CacheStore has one line which reads "return null" for the following methods:
     load(..)
     loadAll(..)
     Is there a more efficient/effective way to write to disk and ignore reads if item does not exist in distributed map rather than extending CacheStore and returning null for all methods noted above?
     My reading and writing to disk occurs using the ExternalizableHelper class, thx for this nice work.
     2. How are CacheStore's instantiated initially? Since we want each cache (say we have two different caches here for simplicity) backed up to file every t minutes, do we have to have a separate CacheStore object for each cache? What is the best practice to attach a cachestore to a particular cache?
     For example, I start two Tangosol instances, one on machineA and one on machineB, both storing data as per my configuration. The 2 caches being used are "cacheA" and "cacheB". So when I start the two Tangosol instances, I have to instantiate CacheStore twice so that I can separately write "cacheA" and "cacheB" to their own separate files.
     3. When backup to disk occurs, is there any removing of items from the distributed cache?
     4. I'm not completely sure on the write delay here. What if an item in the cache is just added once, and no updates occur on it (ie. just one put, and 0+ gets). After a specified amount of time, will this be written to disk, or does an update on this object in the cache have to occur before this item can be added to the write queue and eventually written to disk? Once an item is added for the first time, does this trigger the update time for this object to be the first write time?
     Thanks,
     - Noah

Hi Noah,
     1. No, load() and loadAll() returning null is the most effective way of implementing this.
     2. You can pass the cache name as a constructor parameter - see Parameter Macros in the Coherence User Guide.
     3. No, nothing is removed from the cache
     4. Writes are only triggered by put()'s.
     For more information please take a look at this forum post: <a href = "http://www.tangosol.net/forums/thread.jspa?threadID=445&tstart=0">What is Read-Through/Write-Through/Write-Behind Caching? </a>
     Regards,
     Dimitri

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