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Usage

. use Cache::Mmap;
$cache=Cache::Mmap->new($filename,\%options);
. Loads the module and binds to $filename, creating if it doesn't exist
. ($found,$value1)=$cache->read($key1);
. Fetch value from cache with key $key1
. $found is true if item found in cache or underlying data
. $cache->write($key2,$value2);
. Update/insert value into cache with key $key2.
. Update underlying data if appropriate options set
. $cache->delete($key3);
. Delete cache entry $key3 from cache.
. Update underlying data if appropriate options set

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