What is the replacement for Sets.newConcurrentHashSet()?

guava, java

Solution

`Sets.newConcurrentHashSet` was withdrawn in 1.0rc1 (commit log). I don't know the reason for the withdrawal, but you could use the implementation yourself:

Sets.newSetFromMap(new ConcurrentHashMap<V, Boolean>());

Problem

I am upgrading from Google Collections 0.9 to 1.0. It seems `Sets.newConcurrentHashSet()` is no longer available. I was using it in the following construct: ``` public static <K, V> Multimap<K, V> newConcurrentMultimap() { return Multimaps.newMultimap( new ConcurrentHashMap<K, Collection<V>>(), new Supplier<Collection<V>>() { @Override public Collection<V> get() { return Sets.<V>newConcurrentHashSet(); } } ); } ``` What would be the best replacement for Sets.newConcurrentHashSet() ? Edit: The reason for this construct is to have a multimap that is safe to read and write from multiple threads. It is used in a mostly-read scenario (and will be read a lot).

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