Recap
Working with shared mutable state is a huge burden that requires us to endure added complexity and the accompanied greater chances of error. When refactoring code, look out for some common concurrency-related mistakes:
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Don’t create threads from within constructors; instead, create them in static factory methods—see Preserve Invariant.
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Don’t create arbitrary threads; instead, use a pool of threads to reduce the tasks startup time and resource use—see Mind Your Resources.
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Ensure that access to mutable fields cross memory barrier and are visible to threads properly—see Ensure Visibility.
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Evaluate the granularity of locks and promote concurrency. Ensure that the locks are not overly conservative but are at the right level to provide adequate ...
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