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Use computeIfAbsent() replace putIfAbsent() #1402

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Use computeIfAbsent() replace putIfAbsent() #1402

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zhanghailang123
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Fixes #1400

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Check mailbox configuration when submitting. Contributor Guide

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@zhanghailang123 Please provide unit tests for code changes.

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[Enhancement] Use ConcurrentHashMap.computeIfAbsent() replace putIfAbsent().
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@zhanghailang123 @magestacks