This instance is used for all messages that are sent into the partition, making members of this class thread safe and providing the opportunity to cache required resources.
这个实例被用于发送到该分区中的所有消息，使这个类的成员线程安全并提供缓存必要资源的机会。
Making a class thread safe requires additional care during the implementation and testing of the class.
使一个类线程安全需要在实现和测试该类时非常小心。
Consider a thread-safe container class - a data structure that guarantees thread safety to its clients.
可以考虑使用一个线程安全容器类—一个保证用户操作线程安全的数据结构。
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