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