当Guava Table的支持映射是线程安全的时，它是安全的吗? [英] Is a Guava Table thread safe when its backing maps are thread safe?

问题描述

Guava的

Will Guava's Tables.newCustomTable(Map, Supplier) method return thread safe tables when supplied with thread safe maps? For example:

public static <R, C, V> Table<R, C, V> newConcurrentTable() {
  return Tables.newCustomTable(
      new ConcurrentHashMap<R, Map<C, V>>(),
      new Supplier<Map<C, V>>() {
        public Map<C, V> get() {
          return new ConcurrentHashMap<C, V>();
        }
      });
}

该代码是否真的返回并发表?

Does that code actually return concurrent tables?

推荐答案

从文档中获取:如果多个线程同时访问该表，并且其中一个线程修改了该表，则必须在外部进行同步."

From the doc: "If multiple threads access this table concurrently and one of the threads modifies the table, it must be synchronized externally."

并发支持集还不够.

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