Android LruCache（Android 3.1）线程安全

发布于 2024-11-30 11:01:57 字数 392 浏览 0 评论 0原文

新的 Android 类 LruCache 线程安全吗？ java 文档说：

该类是线程安全的。通过在缓存上同步以原子方式执行多个缓存操作：

   synchronized (cache) {
     if (cache.get(key) == null) {
         cache.put(key, value);

   }}

他们的意思是说不是线程安全的吗？如果类是线程安全的，为什么必须同步？

谢谢！

原文

Is the new Android class LruCache thread safe? The java doc says:

This class is thread-safe. Perform multiple cache operations atomically by synchronizing on the cache:

   synchronized (cache) {
     if (cache.get(key) == null) {
         cache.put(key, value);

   }}

Did they mean to say NOT thread-safe? Why would one have to synchronize if the class is thread safe?

Thanks!

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

她比我温柔 2024-12-07 11:01:57

该类是否线程安全并不重要。如果您使用多个操作，您可能仍然需要同步。取决于你如何使用它。

if (cache.get(key) == null)
{
  //at this point you think there is no such value in the cache
  //but another thread might have just added one between executing
  //those two lines of code
  cache.put(key, value);
}

Doesn't matter whether the class is thread-safe or not. If you use multiple operations you may still need to synchronize. Depends on how you use it.

if (cache.get(key) == null)
{
  //at this point you think there is no such value in the cache
  //but another thread might have just added one between executing
  //those two lines of code
  cache.put(key, value);
}

回复收藏 0 原文

~没有更多了~