package Ġno . nav . so kn ad . ark iver ing . so kn ads ark iver er . kafka Ċ Ċ import Ġio . con fluent . kafka . serializers . Abstract Kafka Schema Ser De Config . SCHEMA _ REGISTRY _ URL _ CONFIG Ċ import Ġio . con fluent . kafka . streams . ser des . avro . Specific Av ro Ser de Ċ import Ġno . nav . so kn ad . ark iver ing . avro schemas . Event Types Ċ import Ġno . nav . so kn ad . ark iver ing . avro schemas . Processing Event Ċ import Ġno . nav . so kn ad . ark iver ing . avro schemas . S ok nad ark iv schema Ċ import Ġno . nav . so kn ad . ark iver ing . so kn ads ark iver er . config . App Configuration Ċ import Ġno . nav . so kn ad . ark iver ing . so kn ads ark iver er . service . TaskList Service Ċ import Ġorg . apache . avro . specific . Specific Record Ċ import Ġorg . apache . kafka . clients . Common Client Configs Ċ import Ġorg . apache . kafka . clients . consumer . Consumer Config Ċ import Ġorg . apache . kafka . common . config . S asl Configs Ċ import Ġorg . apache . kafka . common . serialization . Ser de Ċ import Ġorg . apache . kafka . common . serialization . Ser des Ċ import Ġorg . apache . kafka . common . utils . Bytes Ċ import Ġorg . apache . kafka . streams . Kafka Streams Ċ import Ġorg . apache . kafka . streams . Streams Builder Ċ import Ġorg . apache . kafka . streams . Streams Config Ċ import Ġorg . apache . kafka . streams . errors . Log And Continue ExceptionHandler Ċ import Ġorg . apache . kafka . streams . k stream . Cons umed Ċ import Ġorg . apache . kafka . streams . k stream . Joined Ċ import Ġorg . apache . kafka . streams . k stream . Material ized Ċ import Ġorg . apache . kafka . streams . state . KeyValue Store Ċ import Ġorg . slf 4 j . LoggerFactory Ċ import Ġjava . util .* Ċ Ċ class ĠKafka Streams Setup ( Ċ ĉ private Ġval Ġapp Configuration : ĠApp Configuration , Ċ ĉ private Ġval Ġtask List Service : ĠTask List Service , Ċ ĉ private Ġval Ġkafka Publisher : ĠKafka Publisher Ċ ) Ġ{ ĊĊ ĉ private Ġval Ġlogger Ġ= ĠLoggerFactory . getLogger ( java Class ) ĊĊ ĉ private Ġval Ġstring Ser de Ġ= ĠSer des . String Ser de () Ċ ĉ private Ġval Ġprocessing Event Ser de Ġ= Ġcreate Processing Event Ser de () Ċ ĉ private Ġval Ġs ok nad ark iv schema Ser de Ġ= Ġcreate S ok nad ark iv schema Ser de () Ċ ĉ private Ġval Ġmutable List Ser de : ĠSer de < Mutable List < String >> Ġ= ĠMutable List Ser de () ĊĊĊ ĉ private Ġfun Ġkafka Streams ( streams Builder : ĠStreams Builder ) Ġ{ Ċĉ ĉ val Ġjoin Def Ġ= ĠJo ined . with ( string Ser de , Ġprocessing Event Ser de , Ġs ok nad ark iv schema Ser de , Ġ" arch iving State ") Ċĉ ĉ val Ġmaterial ized Ġ= ĠMaterial ized .` as `< String , ĠMutable List < String >, ĠKey Value Store < Bytes , ĠByteArray >> (" Processing Event Dto s "). with Value Ser de ( mutable List Ser de ) Ċĉ ĉ val Ġinput Topic Stream Ġ= Ġstreams Builder . stream ( app Configuration . kafka Config . input Topic , ĠCon su med . with ( string Ser de , Ġs ok nad ark iv schema Ser de )) Ċĉ ĉ val Ġprocessing Topic Stream Ġ= Ġstreams Builder . stream ( app Configuration . kafka Config . processing Topic , ĠCon su med . with ( string Ser de , Ġprocessing Event Ser de )) ĊĊĉ ĉ val Ġinput Table Ġ= Ġinput Topic Stream . to Table () ĊĊĉ ĉ input Topic Stream Ċĉĉ ĉ . peek Ġ{ Ġkey , Ġvalue Ġ-> Ġlogger . info ("$ key : ĠProcessing ĠInput Topic . ĠBe hand lings Id : Ġ${ value . be hand lings id }") Ġ} Ċĉĉ ĉ . foreach Ġ{ Ġkey , Ġ_ Ġ-> Ġkafka Publisher . put Processing Event On Topic ( key , ĠProcessing Event ( Event Types . RECE IVED )) Ġ} ĊĊĉ ĉ processing Topic Stream Ċĉĉ ĉ . peek Ġ{ Ġkey , Ġvalue Ġ-> Ġlogger . info ("$ key : ĠProcessing Topic Ġ- Ġ${ value . type }") Ġ} Ċĉĉ ĉ // ĠAg greg ere Ġstate Ġs lik Ġat ĠRE CE IVED Ġkan Ġer stat tes Ġav Ġalle Ġet ter f Ã¸ l gende Ġstates : ĠSTART ED , ĠARCH IVED , ĠFAILED , ĠFIN ISHED Ċĉĉ ĉ . map Values Ġ{ Ġprocessing Event Ġ-> Ġprocessing Event . type . name Ġ} Ċĉĉ ĉ . group ByKey () Ċĉĉ ĉ . aggregate ( Ġ Ġ// ĠReturn er er Ġen Ġtabel l Ġ< Key , ĠValue > Ġder Ġvalue Ġer Ġen ĠList e Ġav Ġevent type Ċĉĉĉ ĉ { Ġmutable ListOf () Ġ}, Ġ// ĠInit iator Ċĉĉĉ ĉ { Ġ_, Ġvalue , Ġaggregate Ġ-> Ġ Ġ// Ġag gregator Ċĉĉĉĉ ĉ aggregate . add ( value ) Ċĉĉĉĉ ĉ aggregate Ċĉĉĉ ĉ }, Ċĉĉĉ ĉ material ized Ġ// ĠMaterial is ert Ġsom ĠKey Value Ġstore Ċĉĉ ĉ ) Ċĉĉ ĉ . map Values Ġ{ Ġprocessing Events Ġ-> ĠProcessing Event Dto ( processing Events ) Ġ} Ġ// Ġmapper Ġevent type Ġtil ĠProcessing Event Dto Ċĉĉ ĉ . map Values Ġ{ Ġprocessing Events Ġ-> Ġprocessing Events . getNew est State () Ġ} Ċĉĉ ĉ . to Stream () Ċĉĉ ĉ . peek Ġ{ Ġkey , Ġstate Ġ-> Ġlogger . debug ("$ key : ĠProcessing Topic Ġin Ġstate Ġ$ state ") Ġ} Ċĉĉ ĉ . filter Ġ{ Ġkey , Ġstate Ġ-> Ġ!( is Consider ed Finished ( key , Ġstate )) Ġ} Ċĉĉ ĉ . leftJoin ( input Table , Ġ{ Ġstate , Ġs ok nad ark iv schema Ġ-> Ġs ok nad ark iv schema Ġto Ġstate Ġ}, Ġjoin Def ) Ġ// ĠO pp dat ere Ġstate ĠpÃ¥ Ġtabel l , Ġarch iving State , Ġved Ġjoin Ġav Ġs ok nad ark iv schema Ġog Ġstate . Ċĉĉ ĉ . filter Ġ{ Ġkey , Ġ( so kn ad ark iv schema , Ġ_) Ġ-> Ġfilter S ok nad ark iv schema That Are Null ( key , Ġs ok nad ark iv schema ) Ġ} Ġ// ĠTa Ġb ort Ġalle Ġinn sl ag Ġi Ġtabel l Ġder Ġs ok nad ark iv schema Ġer Ġnull . Ċĉĉ ĉ . peek Ġ{ Ġkey , Ġ( so kn ad ark iv schema , Ġstate ) Ġ-> Ġlogger . debug ("$ key : ĠProcessing Topic Ġwill Ġadd / update Ġtask . ĠState : Ġ$ state ĠS ok nad ark iv schema : Ġ${ so kn ad ark iv schema . print () }") Ġ} Ċĉĉ ĉ . foreach Ġ{ Ġkey , Ġ( so kn ad ark iv schema , Ġstate ) Ġ-> Ġtask List Service . add OrUpdate Task ( key , Ġs ok nad ark iv schema , Ġstate . type ) Ġ} Ġ// ĠFor Ġh vert Ġinn sl ag Ġi Ġtabel l Ġ( key , Ġs ok nad ark iv schema , Ġcount ), Ġsk ed uler Ġ ark ver ing st ask Ċ ĉ } ĊĊ ĉ private Ġfun Ġis Consider ed Finished ( key : ĠString , Ġprocessing Event : ĠProcessing Event ): ĠBoolean Ġ{ Ċĉ ĉ return Ġwhen Ġ( processing Event . type ) Ġ{ Ċĉĉ ĉ Event Types . FINISHED Ġ-> Ġ{ Ċĉĉĉ ĉ task List Service . finish Task ( key ) Ċĉĉĉ ĉ true Ċĉĉ ĉ } Ċĉĉ ĉ Event Types . FAILURE Ġ-> Ġ{ Ċĉĉĉ ĉ task List Service . fail Task ( key ) Ċĉĉĉ ĉ true Ċĉĉ ĉ } Ċĉĉ ĉ else Ġ-> Ġfalse Ċĉ ĉ } Ċ ĉ } ĊĊĊ ĉ private Ġfun Ġfilter S ok nad ark iv schema That Are Null ( key : ĠString , Ġs ok nad ark iv schema : ĠS ok nad ark iv schema ?): ĠBoolean Ġ{ Ċĉ ĉ if Ġ( so kn ad ark iv schema Ġ== Ġnull ) Ċĉĉ ĉ logger . error ("$ key : ĠS ok nad ark iv schema Ġis Ġnull !") Ċĉ ĉ return Ġs ok nad ark iv schema Ġ!= Ġnull Ċ ĉ } ĊĊ ĉ private Ġfun ĠS ok nad ark iv schema . print (): ĠString Ġ{ Ċĉ ĉ val Ġfn r Ġ= Ġ"** fn r Ġcan Ġbe Ġfound Ġin ĠS ok nad sm ott aker 's Ġsecure Ġlogs ** " Ċĉ ĉ val Ġa Ġ= ĠS ok nad ark iv schema ( this . be hand lings id , Ġfn r , Ġthis . ark iv t ema , Ġthis . in ns end t D ato , Ġthis . so kn ad stype , Ġthis . mot tat te D okument er ) Ċĉ ĉ return Ġa . toString () Ċ ĉ } ĊĊĊ ĉ fun Ġsetup Kafka Streams ( groupId : ĠString ): ĠKafka Streams Ġ{ Ċĉ ĉ logger . info (" Setting Ġup ĠKafka Streams ") ĊĊĉ ĉ val Ġstreams Builder Ġ= ĠStreams Builder () Ċĉ ĉ kafka Streams ( streams Builder ) Ċĉ ĉ val Ġtopology Ġ= Ġstreams Builder . build () ĊĊĉ ĉ val Ġkafka Streams Ġ= ĠKafka Streams ( topology , Ġkafka Config ( groupId )) ĊĊĉ ĉ kafka Streams . clean Up () Ċĉ ĉ kafka Streams . set Un caught ExceptionHandler ( kafka ExceptionHandler ()) Ċĉ ĉ kafka Streams . start () Ċĉ ĉ Runtime . get Runtime (). add Shutdown Hook ( Thread ( kafka Streams :: close )) ĊĊĉ ĉ logger . info (" Finished Ġsetting Ġup ĠKafka Streams ") Ċĉ ĉ return Ġkafka Streams Ċ ĉ } ĊĊ ĉ private Ġfun Ġkafka Config ( application Id : ĠString ) Ġ= ĠProperties (). also Ġ{ Ċĉ ĉ it [ SCHEMA _ REGISTRY _ URL _ CONFIG ] Ġ= Ġapp Configuration . kafka Config . schema Registry Url Ċĉ ĉ it [ Consumer Config . AUTO _ OFFSET _ RESET _ CONFIG ] Ġ= Ġ" ear liest " Ċĉ ĉ it [ Streams Config . APPLICATION _ ID _ CONFIG ] Ġ= Ġapplication Id Ċĉ ĉ it [ Streams Config . BOOT STR AP _ SERVER S _ CONFIG ] Ġ= Ġapp Configuration . kafka Config . servers Ċĉ ĉ it [ Streams Config . DEFAULT _ KEY _ SER DE _ CLASS _ CONFIG ] Ġ= ĠSer des . String Ser de :: class . java Ċĉ ĉ it [ Streams Config . DEFAULT _ VALUE _ SER DE _ CLASS _ CONFIG ] Ġ= ĠSpecific Av ro Ser de :: class . java Ċĉ ĉ it [ Streams Config . DEFAULT _ DE SERIAL IZATION _ EXCEPTION _ HANDLER _ CLASS _ CONFIG ] Ġ= ĠLog And Continue ExceptionHandler :: class . java Ċĉ ĉ it [ Streams Config . COMMIT _ INTERVAL _ MS _ CONFIG ] Ġ= Ġ 1 0 0 0 ĊĊĉ ĉ if Ġ( app Configuration . kafka Config . secure Ġ== Ġ" TRUE ") Ġ{ Ċĉĉ ĉ it [ Common Client Configs . SECURITY _ PROTOCOL _ CONFIG ] Ġ= Ġapp Configuration . kafka Config . protocol Ċĉĉ ĉ it [ S asl Configs . SAS L _ JA AS _ CONFIG ] Ġ= Ġapp Configuration . kafka Config . sas l Ja as Config Ċĉĉ ĉ it [ S asl Configs . SAS L _ ME CHAN IS M ] Ġ= Ġapp Configuration . kafka Config . s als me c Ċĉ ĉ } ĊĊĉ ĉ it [ K AF KA _ PUBL IS HER ] Ġ= Ġkafka Publisher Ċ ĉ } ĊĊ ĉ private Ġfun Ġkafka ExceptionHandler () Ġ= ĠKafka ExceptionHandler (). also Ġ{ Ċĉ ĉ it . configure ( Ċĉĉ ĉ kafka Config (" so kn ads ark iver er - exception ") Ċĉĉĉ ĉ . also Ġ{ Ġconfig Ġ-> Ġconfig [ APP _ CONFIGURATION ] Ġ= Ġapp Configuration Ġ} Ċĉĉĉ ĉ . map Ġ{ Ġ( k , Ġv ) Ġ-> Ġk . toString () Ġto Ġv Ġ}. toMap () Ċĉ ĉ ) Ċ ĉ } ĊĊ ĉ private Ġfun Ġcreate Processing Event Ser de (): ĠSpecific Av ro Ser de < Processing Event > Ġ= Ġcreate Av ro Ser de () Ċ ĉ private Ġfun Ġcreate S ok nad ark iv schema Ser de (): ĠSpecific Av ro Ser de < S ok nad ark iv schema > Ġ= Ġcreate Av ro Ser de () ĊĊ ĉ private Ġfun Ġ< T Ġ: ĠSpecific Record > Ġcreate Av ro Ser de (): ĠSpecific Av ro Ser de < T > Ġ{ Ċĉ ĉ val Ġserde Config Ġ= Ġhash Map Of ( SCHEMA _ REGISTRY _ URL _ CONFIG Ġto Ġapp Configuration . kafka Config . schema Registry Url ) Ċĉ ĉ return ĠSpecific Av ro Ser de < T >(). also Ġ{ Ġit . configure ( serde Config , Ġfalse ) Ġ} Ċ ĉ } Ċ } Ċ Ċ const Ġval ĠAPP _ CONFIGURATION Ġ= Ġ" app _ configuration " Ċ const Ġval ĠK AF KA _ PUBL IS HER Ġ= Ġ" kafka . publisher " Ċ const Ġval ĠMESSAGE _ ID Ġ= Ġ" MESSAGE _ ID " Ċ