Changed Observable.empty() into a stateless constant observable. #2622
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akarnokd
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Feb 6, 2015
Changed Observable.empty() into a stateless constant observable.
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Empty was always stateless so creating a new instance all the time (especially through a
from(Iterable)) is wasteful. Besides,onCompletedevents don't have to be backpressured.Should enable identity based optimizations discussed in #1653.