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ISynchHash

The ISynchHash object has functionality similar to a hash table, but with cluster synchronization and LRU behaviors.

Note that the use of this object has performance implications. Before you use ISynchHash, consider the performance cost of reloading data compared to the memory usage per JVM. Use cluster synchronization only when a backing store is likely to change and invalidate stored results in a given VM.

Operational considerations (from Sun Microsystems) suggest that data read vs. write from a synchronized hash should be in an 80/20 ratio if the synchronization is across multiple machines. Non-synchronized hashes do not have this suggested restriction.

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List of Methods

 

Table 9: List of ISynchHash Methods

Method	Summary
clear	Clears a hash and synchronizes the cluster.
get	Gets the specified object from hash and performs required data validation/VM synchronization checks as needed.
getName	Gets the name of the hash as it is managed.
put	Adds an object to the hash and generates appropriate cluster synchronization methods and least-recently-used behavior.
remove	Removes an item from the hash and synchronizes the cluster as needed.

 

 

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