OnBackpressureLatest: Non-blocking version of the toBlocking().latest() operator. #2923
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| * Note that if the upstream Observable does support backpressure, this operator ignores that capability | ||
| * and doesn't propagate any backpressure requests from downstream. | ||
| * <p> | ||
| * Note that due to the nature of how backpressure requests are propagated through subscribeOn/observeOn, |
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This sentence isn't clear to me. I imagine it has something to do with how request(n) generally will happen in batches so onNext emissions will happen in bursts and drop everything but the latest in between in each burst?
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The reason is that the operator basically pairs requests and emission on a 1:1 basis: if one requests 5, it would behave as if one called request(1) five times and thus giving the window for dropping unawaited values.
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I like this feature. Been wanting something like this for a while. |
benjchristensen
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OnBackpressureLatest: Non-blocking version of the toBlocking().latest() operator.
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This is essentially the pair of the
OnBackpressureDrop. WhileOnBackpressureDropemits the first value requested and then drops the rest,OnBackpressureLatestdrops values but the latest and emits that when requested. One can also think of this operator as a sample with backpressure.One mentionable property is that since it holds onto the very last value, downstream has to request at least one to receive
onCompleted().