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22 lines
1.1 KiB
Scala
22 lines
1.1 KiB
Scala
package com.twitter.product_mixer.component_library.gate
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import com.twitter.product_mixer.core.functional_component.common.CandidateScope
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import com.twitter.product_mixer.core.functional_component.gate.QueryAndCandidateGate
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import com.twitter.product_mixer.core.model.common.identifier.GateIdentifier
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import com.twitter.product_mixer.core.model.common.presentation.CandidateWithDetails
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import com.twitter.product_mixer.core.pipeline.PipelineQuery
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import com.twitter.stitch.Stitch
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/**
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* A Gate that only continues if the previously returned candidates are empty. This is useful
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* for gating dependent candidate pipelines that are intedned to be used as a backfill when there
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* are no candidates available.
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*/
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case class NoCandidatesGate(scope: CandidateScope) extends QueryAndCandidateGate[PipelineQuery] {
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override val identifier: GateIdentifier = GateIdentifier("NoCandidates")
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override def shouldContinue(
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query: PipelineQuery,
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candidates: Seq[CandidateWithDetails]
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): Stitch[Boolean] = Stitch.value(scope.partition(candidates).candidatesInScope.isEmpty)
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}
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