boon/src/main/java/org/boon/cache/SimpleConcurrentCache.java
private final int hash( Object k ) {
        int h = hashSeed;

        h ^= k.hashCode();

        h ^= ( h >>> 20 ) ^ ( h >>> 12 );
        return h ^ ( h >>> 7 ) ^ ( h >>> 4 );
    }
private final int hash( Object k ) {
        int h = hashSeed;

        h ^= k.hashCode();

        h ^= ( h >>> 20 ) ^ ( h >>> 12 );
        return h ^ ( h >>> 7 ) ^ ( h >>> 4 );
    }
Calculate the hash.
@param k key
@return