mirror of
https://github.com/twitter/the-algorithm.git
synced 2024-06-18 09:08:48 +02:00
22 lines
1.1 KiB
Scala
22 lines
1.1 KiB
Scala
|
package com.twitter.product_mixer.component_library.gate
|
||
|
|
|
||
|
|
import com.twitter.product_mixer.core.functional_component.common.CandidateScope
|
||
|
|
import com.twitter.product_mixer.core.functional_component.gate.QueryAndCandidateGate
|
||
|
|
import com.twitter.product_mixer.core.model.common.identifier.GateIdentifier
|
||
|
|
import com.twitter.product_mixer.core.model.common.presentation.CandidateWithDetails
|
||
|
|
import com.twitter.product_mixer.core.pipeline.PipelineQuery
|
||
|
|
import com.twitter.stitch.Stitch
|
||
|
|
|
||
|
|
/**
|
||
|
|
* A Gate that only continues if the previously returned candidates are empty. This is useful
|
||
|
|
* for gating dependent candidate pipelines that are intedned to be used as a backfill when there
|
||
|
|
* are no candidates available.
|
||
|
|
*/
|
||
|
|
case class NoCandidatesGate(scope: CandidateScope) extends QueryAndCandidateGate[PipelineQuery] {
|
||
|
|
override val identifier: GateIdentifier = GateIdentifier("NoCandidates")
|
||
|
|
override def shouldContinue(
|
||
|
|
query: PipelineQuery,
|
||
|
|
candidates: Seq[CandidateWithDetails]
|
||
|
|
): Stitch[Boolean] = Stitch.value(scope.partition(candidates).candidatesInScope.isEmpty)
|
||
|
|
}
|