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American Express Lead Developer Interview Question

I interviewed in Saint Petersburg, FL and was asked:
"How would you implement a limited capacity cache that can be used as a temporary storage with expiry."
Tags: algorithm
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Part of a Lead Developer Interview Review - one of 502 American Express Interview Reviews

Answers & Comments

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Use a static list of objects and always add new items to the end of the list

Every time an item is accessed from the list, remove it from its current position and add to the end of the list.

Whenever you reach the maximum allowed items in the list please remove the item in the top of the list.

Make sure any operation that adds or removes items from the list places a write lock on the list.
- Interview Candidate on Oct 8, 2013

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