Scala - 可变线程安全集合 [英] Scala - Mutable thread safe collections
问题描述
我需要一个可变线程安全地图和可变线程安全列表在Scala中。我知道默认情况下，不可变的集合是线程安全的。但是，我需要更新我的集合，因为我不能使用不变的。此外，我需要我的线程安全可变地图来维护插入顺序。
I need a mutable thread safe Map and a mutable thread safe List in Scala. I know that the immutable collections are thread safe by default. But, I need to update my collections very often because of which I couldn't use immutable. Also I need my threadsafe mutable Map to maintain the insertion order.
现在正在使用下面的地图
Right now am using the map below
val map = scala.collection.mutable.LinkedHashMap[String,Any]()
此地图维护插入顺序并且是可变的。如何使线程安全？
This map maintains the insertion order and is mutable. How do I make it thread safe?
推荐答案
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正如 AlexIv在他的回答中提到的，如果你想要线程安全，你可以混合一个特征。还有另一种方法：
- You're duplicating topics....
As was mentioned by AlexIv in his answer, there's a trait you can mix in if you want thread safety. There's another way though:
val synchronizedMap = new scala.collection.mutable.LinkedHashMap[String, Any]() with scala.collection.mutable.SynchronizedMap[String, Any]
这应该可以让您每次访问同步映射 。容易，但可能不符合性能要求。如果是这样，创建一个扩展 LinkedHashMap 的自定义类可能更容易，在 concurrent.Map trait（如建议），并提供相关方法的实现，即： putIfAbsent ，删除 替换（2重载） 。
That should give you the map with synchronization on each access. Easy, but might not meet the performance requirements. If so, it would be probably easier to create a custom class extending the LinkedHashMap, mixing in the concurrent.Map trait (as was suggested) and provide the implementation of relevant methods, i.e: putIfAbsent, remove replace (2 overloads).
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