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javastaticthread-safetyguava
Soundlink
Soundlink

Reputation: 3931

guava-libraries - Is the Ordering class thread safe?

The guava-libraries have a class Ordering. I'm wondering if it's thread safe.

For example, can it be used as a static variable?

public static Ordering<String> BY_LENGTH_ORDERING = new Ordering<String>() {
   public int compare(String left, String right) {
      return Ints.compare(left.length(), right.length());
   }
};

Upvotes: 7

Views: 771

Answers (2)

ColinD
ColinD

Reputation: 110084

Yes, Ordering objects are all immutable unless you do something to make them mutable, such as extending Ordering and adding mutable fields, or providing a mutable Comparator in the from(Comparator) method or a mutable Function in onResultOf(Function).

But typically, you'd really have to go out of your way to make one that isn't thread safe.

Upvotes: 5

Alexander Pogrebnyak
Alexander Pogrebnyak

Reputation: 45596

It's as thread-safe as your compare method.

Default implementation of Ordering does not have any instance data, so the only thing that matters is how you define your compare method.

Upvotes: 8

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