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kotlinlang

works good!    Softref holds the String pinning the weakref :stuck_out_tongue:
```val bolCache: MutableMap&lt;String, SoftReference&lt;Pai2&lt;RowVec, String&gt;&gt;&gt; = WeakHashMap(0)```

Not sure what you're doing, but looks really scary. There's a a lot of possible issues.

the algorithm it serves is bollinger bands, something roughly like a rolling average of n rows with some transforms worth keeping from one row to the next.

it gets the job done, and exploits the one thing softref does well, holds garbage for a little while

elvis1, elvis2, and elvis3 all need to agree that the row is !null or the map follows through with getOrPut (again)