8.3.4. Unscheduled Write-Behind Strategy Configuration (Library Mode)

To enable the write-behind strategy of the cache entries to a store, add the async element to the store configuration as follows: 
<loaders>
    <fileStore location="${LOCATION}">
        <async enabled="true" 
                    modificationQueueSize="1024" 
                    shutdownTimeout="25000" 
                    flushLockTimeout="15000" 
                    threadPoolSize="5"/>
    </fileStore>
</loaders>
The async element uses the following configuration parameters:
  • The modificationQueueSize parameter sets the modification queue size for the asynchronous store. If updates occur faster than the cache store can process the queue, the asynchronous store behaves like a synchronous store. The store behavior remains synchronous and blocks elements until the queue is able to accept them, after which the store behavior becomes asynchronous again.
  • The shutdownTimeout parameter specifies the time in milliseconds after which the cache store is shut down. This provides time for the asynchronous writer to flush data to the store when a cache is shut down. The default value for this parameter is 25000.
  • The flushLockTimeout parameter specifies the time (in milliseconds) to acquire the lock that guards the state to be periodically flushed. The default value for this parameter is 15000.
  • The threadPoolSize parameter specifies the number of threads that concurrently apply modifications to the store. The default value for this parameter is 5.
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