the-algorithm/home-mixer/server/src/main/scala/com/twitter/home_mixer/functional_component/gate/RequestContextNotGate.scala

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package com.twitter.home_mixer.functional_component.gate
import com.twitter.home_mixer.model.request.DeviceContext.RequestContext
import com.twitter.home_mixer.model.request.HasDeviceContext
import com.twitter.product_mixer.core.functional_component.gate.Gate
import com.twitter.product_mixer.core.model.common.identifier.GateIdentifier
import com.twitter.product_mixer.core.pipeline.PipelineQuery
import com.twitter.stitch.Stitch
/**
* Gate that fetches the request context from the device context and
* continues if the request context does not match any of the specified ones.
*
* If no input request context is specified, the gate continues
*/
case class RequestContextNotGate(requestContexts: Seq[RequestContext.Value])
extends Gate[PipelineQuery with HasDeviceContext] {
override val identifier: GateIdentifier = GateIdentifier("RequestContextNot")
override def shouldContinue(query: PipelineQuery with HasDeviceContext): Stitch[Boolean] =
Stitch.value(
!requestContexts.exists(query.deviceContext.flatMap(_.requestContextValue).contains))
}