Created
February 7, 2017 12:45
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| trait PlayerProfile | |
| trait PlayerProps | |
| trait Signal | |
| type EnrichedSignal = (Signal, PlayerProfile, PlayerProps) | |
| val sc: StreamingContext = ??? | |
| val ss: DStream[(String, Signal)] = ??? | |
| val as: DStream[(String, PlayerProfile)] = ??? | |
| val ps: DStream[(String, PlayerProps)] = ??? | |
| val spec = StateSpec | |
| .function(trackStateFunc _) | |
| .initialState(sc.sparkContext.emptyRDD[(String, (PlayerProfile, PlayerProps))]) | |
| def goToCassandra(key: String): (PlayerProfile, PlayerProps) = ??? | |
| def trackStateFunc( | |
| batchTime: Time, | |
| key: String, | |
| value: Option[(Option[PlayerProfile], Option[PlayerProps])], | |
| state: State[(PlayerProfile, PlayerProps)]): Option[(PlayerProfile, PlayerProps)] = { | |
| state.getOption().map { case (profile, props) => | |
| value.map { case (newProfile, newProps) => | |
| (newProfile.getOrElse(profile), newProps.getOrElse(props)) | |
| } | |
| }.getOrElse(Some(goToCassandra(key))) | |
| } | |
| val result: DStream[EnrichedSignal] = ss | |
| .leftOuterJoin(as) | |
| .leftOuterJoin(ps) | |
| .map { case (key, ((_, profile), props)) => key -> (profile, props) } | |
| .mapWithState(spec) | |
| .stateSnapshots() | |
| .join(ss) | |
| .map { case (_, ((profile, props), signal)) => (signal, profile, props) } |
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