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The fact that some environments mix and match some approaches unnecessarily complicates the discussion, so it is best left out. Asynchronous functions are largely equivalent to message passing, (just a more convenient syntax,) so they do not need to be regarded as a separate category. So, the four approaches that you listed can be restated as only three: ...


From the documentation of ConcurrentHashMap: However, even though all operations are thread-safe, retrieval operations do not entail locking, and there is not any support for locking the entire table in a way that prevents all access. To answer your first two questions: ConcurrentHashMap is guaranteed to be thread safe. When writing, more than one ...

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