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The previous compliant solution does not scale very well because a class with several {{synchronized}} methods is a potential bottleneck as far as acquiring locks is concerned and may further lead to contention or deadlock. The class {{ConcurrentHashMap}}, through a more preferable approach, provides several utility methods to perform atomic operations and is used in this compliant solution \[[Lee 09|AA. Java References#Lee 09]\]. According to Goetz et al. \[[Goetz 06|AA. Java References#Goetz 06]\] section 5.2.1. ConcurrentHashMap: |
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