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>new开发者_如何学PythonConcurrentHashSet();
}
} );
}
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).
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was withdrawn in 1.0rc1 (commit log).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>());
Try to use MapMaker
and then use newSetFromMap()
You can use
Collections.newSetFromMap(new ConcurrentHashMap<>());
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