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We should try and use concurrency strategies that are efficient. For example, see ConcurrentHashMap, ConcurrentHashMap#newKeySet. We should also be careful to size and configure these data structures appropriately. Using a default sized ConcurrentHashMap for a large set of objects is expensive and generally a waste. Forgetting to set the concurrency level appropriately when there is classloading level concurrency going on is also a real problem.

We should not do dumb polling - usually this is laziness. Prefer callbacks and #wait #notify #notifyAll or other such efficient mechanisms.

Good Java Practices

When we make shortcuts, like violating encapsulation, we create situations that may be reasonable now, but cause problems later. We don't want to be pedantic, but many of the lessons from Object Oriented programming prevent problems down the line.

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