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50 lines
2.2 KiB
Scala
50 lines
2.2 KiB
Scala
package com.twitter.product_mixer.component_library.candidate_source.timeline_ranker
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import com.twitter.product_mixer.core.feature.Feature
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import com.twitter.product_mixer.core.feature.featuremap.FeatureMapBuilder
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import com.twitter.product_mixer.core.functional_component.candidate_source.CandidateSourceWithExtractedFeatures
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import com.twitter.product_mixer.core.functional_component.candidate_source.CandidatesWithSourceFeatures
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import com.twitter.product_mixer.core.model.common.identifier.CandidateSourceIdentifier
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import com.twitter.product_mixer.core.pipeline.PipelineQuery
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import com.twitter.product_mixer.core.pipeline.pipeline_failure.PipelineFailure
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import com.twitter.product_mixer.core.pipeline.pipeline_failure.UnexpectedCandidateResult
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import com.twitter.stitch.Stitch
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import com.twitter.timelineranker.{thriftscala => t}
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import javax.inject.Inject
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import javax.inject.Singleton
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/**
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* Source tweets of retweets present in Timeline Ranker candidates list.
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* These tweets are used only for further ranking. They are not returned to the end user.
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*/
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case object TimelineRankerUtegSourceTweetsFeature
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extends Feature[PipelineQuery, Seq[t.CandidateTweet]]
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@Singleton
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class TimelineRankerUtegCandidateSource @Inject() (
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timelineRankerClient: t.TimelineRanker.MethodPerEndpoint)
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extends CandidateSourceWithExtractedFeatures[t.UtegLikedByTweetsQuery, t.CandidateTweet] {
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override val identifier: CandidateSourceIdentifier =
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CandidateSourceIdentifier("TimelineRankerUteg")
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override def apply(
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request: t.UtegLikedByTweetsQuery
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): Stitch[CandidatesWithSourceFeatures[t.CandidateTweet]] = {
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Stitch
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.callFuture(timelineRankerClient.getUtegLikedByTweetCandidates(Seq(request)))
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.map { response =>
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val result = response.headOption.getOrElse(
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throw PipelineFailure(UnexpectedCandidateResult, "Empty Timeline Ranker response"))
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val candidates = result.candidates.toSeq.flatten
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val sourceTweets = result.sourceTweets.toSeq.flatten
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val candidateSourceFeatures = FeatureMapBuilder()
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.add(TimelineRankerUtegSourceTweetsFeature, sourceTweets)
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.build()
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CandidatesWithSourceFeatures(candidates = candidates, features = candidateSourceFeatures)
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}
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}
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}
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