Java控制器中的HashMap或ConcurrentHashMap？ [英] HashMap or ConcurrentHashMap at Java Controllers?

问题描述

正如这里所解释的：Java中的并发哈希映射（HashMap）在Java中是并行哈希映射（HashMap）是线程安全的。 Java控制器用于Web请求，可以从Web同时调用。

我的问题是：我应该在Java中使用并发哈希映射而不是哈希映射吗？

解决方案你只需要一个 ConcurrentHashMap ，如果你正在进行并发读取和写入或两个并发写入。如果你在初始化之后永远不改变地图，一个普通的 HashMap 就足够了。

控制器通常不包含任何请求特定的状态（任何这样的状态都应该作为参数传递给方法），如果以这种方式设计控制器，则不需要控制器内的任何同步。

As explained here: ConcurrentHashMap in Java? concurrent hashmap at Java is thread safe. Java controllers are for web requests and can be called simultaneously from web.

My question is that: Should I use concurrent hash map instead of hash map at Java?

解决方案

You only need a ConcurrentHashMap if you will be doing concurrent read along with a write or two concurrent writes. If you never change the map after initialization, a regular HashMap is sufficient.

Controllers should generally not contain any request-specific state (any such state should be passed in to the methods as parameters), and if you design your controllers this way, you shouldn't need any synchronization within your controllers.

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