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User Signal Service (USS) is a centralized online platform that supplies comprehensive data on user actions and behaviors on Twitter. This service stores information on both explicit signals, such as Favorites, Retweets, and replies, and implicit signals like Tweet clicks, profile visits, and more.
62 lines
1.9 KiB
Scala
62 lines
1.9 KiB
Scala
package com.twitter.usersignalservice
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package base
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import com.twitter.frigate.common.store.strato.StratoFetchableStore
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import com.twitter.storehaus.ReadableStore
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import com.twitter.strato.client.Client
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import com.twitter.strato.data.Conv
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import com.twitter.twistly.common.UserId
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import com.twitter.util.Future
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/**
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* A Strato signal fetcher extending BaseSignalFetcher to provide an interface to fetch signals from
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* Strato Column.
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*
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* Extends this when the underlying store is a single Strato column.
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* @tparam StratoKeyType
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* @tparam StratoViewType
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* @tparam StratoValueType
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*/
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trait StratoSignalFetcher[StratoKeyType, StratoViewType, StratoValueType]
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extends BaseSignalFetcher {
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/*
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Define the meta info of the strato column
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*/
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def stratoClient: Client
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def stratoColumnPath: String
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def stratoView: StratoViewType
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/**
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* Override these vals and remove the implicit key words.
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* @return
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*/
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protected implicit def keyConv: Conv[StratoKeyType]
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protected implicit def viewConv: Conv[StratoViewType]
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protected implicit def valueConv: Conv[StratoValueType]
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/**
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* Adapter to transform the userId to the StratoKeyType
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* @param userId
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* @return StratoKeyType
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*/
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protected def toStratoKey(userId: UserId): StratoKeyType
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/**
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* Adapter to transform the StratoValueType to a Seq of RawSignalType
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* @param stratoValue
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* @return Seq[RawSignalType]
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*/
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protected def toRawSignals(stratoValue: StratoValueType): Seq[RawSignalType]
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protected final lazy val underlyingStore: ReadableStore[UserId, Seq[RawSignalType]] =
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StratoFetchableStore
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.withView[StratoKeyType, StratoViewType, StratoValueType](
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stratoClient,
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stratoColumnPath,
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stratoView)
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.composeKeyMapping(toStratoKey)
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.mapValues(toRawSignals)
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override final def getRawSignals(userId: UserId): Future[Option[Seq[RawSignalType]]] =
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underlyingStore.get(userId)
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}
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