mbrodersen wrote:
>> Using atoms is not a good idea. Unless you don't mind if the same
>> message is sometimes printed more than once. Atoms are implemented
>> using spin locks with automatic retry.
>
> Hmmm...unless add-watch => observer is called only once.
Looking in clojure/lang/Atom.java:
public Object swap(IFn f) throws Exception{
for(; ;)
{
Object v = deref();
Object newv = f.invoke(v);
validate(newv);
if(state.compareAndSet(v, newv))
{
notifyWatches(v, newv);
return newv;
}
}
}
So I guess that'd be a yes, it's only called once.
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