@gudenau What do you mean by "decaying map"?
@carlozancanaro You put an element into it, after a certain amount of time it will be removed, unless fetched, updated or "poked".
You can add a removal listener to the cache, which isn't mentioned in that answer but is in the javadoc.
If it's singly linked then you should insert at the tail so you can invalidate items by starting at the head and going forwards until you hit a valid one.
Although if you don't need to do any special processing to invalidate individual entries then you should insert at the head and just drop the entire tail when you read the first invalid item.
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