Event-Driven Architecture

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EVENT-DRIVEN ARCHITECTURE

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EKO KURNIAWAN KHANNEDY ▸ Senior Principal R&D Engineer at Blibli.com ▸ Part of R&D Team ▸ eko.k.khannedy@gdn-commerce.com ▸ JVM User Group Indonesia Committee ▸ Spring Cloud Contributor EVENT-DRIVEN ARCHITECTURE

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MONOLITH FIRST LARGE MONOLITH APPLICATION EVENT-DRIVEN ARCHITECTURE

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MONOLITH MODULES ORDER SERVICE CUSTOMER   SERVICE MERCHANT  SERVICE CART  SERVICE CONTENT  SERVICE ... EVENT-DRIVEN ARCHITECTURE

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MONOLITH PROBLEM ▸ The large monolithic code base intimidates developers. ▸ Overloaded IDE & web container. ▸ Scaling the application can be difﬁcult. ▸ Requires a long-term commitment to a technology stack. EVENT-DRIVEN ARCHITECTURE

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STRANGLER APPLICATION LEGACY  SYSTEM ... CUSTOMER   SERVICE EVENT-DRIVEN ARCHITECTURE https://www.martinfowler.com/bliki/StranglerApplication.html

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MICROSERVICES ERA ORDER MANAGEMENT CUSTOMER   MANAGEMENT MERCHANT  MANAGEMENT CART  MANAGEMENT CONTENT  MANAGEMENT ... EVENT-DRIVEN ARCHITECTURE

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TYPE OF MICROSERVICES MESSAGE  SERVICE RISK  SERVICE ... PRODUCT  SERVICE MEMBER  SERVICE PAYMENT  SERVICE INVENTORY  SERVICE ORDER   SERVICE ... UTILITY MASTER DATA CART  SERVICE FLASHSALE   SERVICE ... ORCHESTRATOR EVENT-DRIVEN ARCHITECTURE

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API DRIVEN / ORCHESTRATION PATTERN Checkout Cart Create Payment CART  SERVICE ORDER   SERVICE PAYMENT  SERVICE Create Order EVENT-DRIVEN ARCHITECTURE

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ORCHESTRATION PATTERN PROBLEM Checkout Cart Send Email Create Payment CART  SERVICE ORDER   SERVICE MESSAGE  SERVICE PAYMENT  SERVICE Create Order EVENT-DRIVEN ARCHITECTURE

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EVENT DRIVEN / CHOREOGRAPHY PATTERN Checkout Cart Send Email Create Payment CART  SERVICE ORDER   SERVICE MESSAGE  SERVICE PAYMENT  SERVICE Create Order CART EVENT EVENT-DRIVEN ARCHITECTURE

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EVENT DRIVEN / CHOREOGRAPHY PATTERN Checkout Cart Send Email Create Payment CART  SERVICE ORDER   SERVICE MESSAGE  SERVICE PAYMENT  SERVICE Create Order CART EVENT RISK  SERVICE Calculate Risk Score EVENT-DRIVEN ARCHITECTURE

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CHOREOGRAPHY PATTERN PROBLEM Checkout Cart Send Email Create Payment CART  SERVICE ORDER   SERVICE MESSAGE  SERVICE PAYMENT  SERVICE Create Order CART EVENT RISK  SERVICE Calculate Risk Score EVENT-DRIVEN ARCHITECTURE

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EVENT-CARRIED STATE TRANSFER Checkout Cart Send Email Create Payment CART  SERVICE ORDER   SERVICE MESSAGE  SERVICE PAYMENT  SERVICE Create Order FULL CART EVENT RISK  SERVICE Calculate Risk Score CART DATA CART DATA CART DATA CART DATA EVENT-DRIVEN ARCHITECTURE

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EVENT-DRIVEN ARHITECTURE EVENT-CARRIED STATE TRANSFER ▸ Good Part ▸ Decoupling ▸ Reduced load on producer ▸ Bad Part ▸ Replicated Data ▸ Eventual Consistency

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EVENT-DRIVEN MICROSERVICES CART  SERVICE ORDER  SERVICE MEMBER  SERVICE MERCHANT  SERVICE RISK  SERVICE ... MESSAGE BROKER API GATEWAY EVENT-DRIVEN ARCHITECTURE

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EVENT VS COMMAND

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IDEMPOTENT

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SAME CALL REPEATEDLY WILL PRODUCE THE SAME RESULT. IN OTHER WORDS, MAKING MULTIPLE IDENTICAL REQUESTS HAS THE SAME EFFECT AS MAKING A SINGLE REQUEST What is idempotent mean? BLIBLI WALLET ARCHITECTURE https://www.restapitutorial.com/lessons/idempotency.html

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EVENT-DRIVEN ARHITECTURE IDEMPOTENT EVENT ▸ SaveMemberEvent ▸ MemberBalanceChangedEvent ▸ SaveOrderEvent ▸ SavePaymentEvent ▸ MemberAddressChangedEvent ▸ ...

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EVENT-DRIVEN ARHITECTURE NON IDEMPOTENT EVENT ▸ IncreaseMemberBalanceEvent ▸ DecreaseMemberBalanceEvent ▸ SendAnEmail ▸ SendOrderNotiﬁcation ▸ ...

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CQRS (COMMAND QUERY RESPONSIBILITY SEGREGATION) https://martinfowler.com/bliki/CQRS.html

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NON CQRS SERVICE DATASOURCE EVENT-DRIVEN ARHITECTURE Write Request Read Request

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DATASOURCE CQRS - SEPARATED COMPONENT COMMAND  MODEL EVENT-DRIVEN ARHITECTURE Write Request Read Request QUERY  MODEL

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EVENT-DRIVEN IN CQRS API GATEWAY MONGODB PRODUCT SERVICE PRODUCT SEARCH SERVICE ELASTICSEARCH APACHE KAFKA Write Request EVENT-DRIVEN ARHITECTURE Read Request Produce Event Consume Event

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EVENT AGGREGATION

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EVENT-DRIVEN ARHITECTURE EVENT AGGREGATION PROBLEM ▸ How to aggregate data from several services? https://www.enterpriseintegrationpatterns.com/patterns/messaging/Aggregator.html

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AGGREGATOR SERVICE API GATEWAY DATASTORE AGGREGATOR SERVICE MESSAGE BROKER Read Aggregate Data Aggregate and Save It Receive All Events EVENT-DRIVEN ARHITECTURE Get Aggregate Data

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THE CHALLENGES

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EVENT-DRIVEN ARHITECTURE THE CHALLENGES OF EVENT-DRIVEN ARCHITECTURE ▸ Asynchronous ▸ Message Schema ▸ Versioning ▸ Tracing ▸ Message Order ▸ Consumer Complexity ▸ Message Broker

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BLIPAY

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https://www.blibli.com/member/blipay/

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SAMPLE EVENT-DRIVEN IN BLIPAY ▸ Register new merchant ▸ Register new member ▸ Refund member cash ▸ Get member + balance ▸ Receive payment conﬁrmation from Bank ▸ … EVENT-DRIVEN ARHITECTURE

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REGISTER NEW MERCHANT BLIPAY-API BLIPAY-MEMBER BLIPAY- MERCHANT BLIPAY-CORE BLIPAY-PAYMENT BLIPAY- NOTIFICATION BLIPAY- PROMOTION APACHE KAFKA 1. HTTP Request 2. HTTP Request 3. SaveMerchantEvent 4. SaveMerchantEvent EVENT-DRIVEN ARHITECTURE

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REGISTER NEW MEMBER BLIPAY-API BLIPAY-MEMBER BLIPAY- MERCHANT BLIPAY-CORE BLIPAY-PAYMENT BLIPAY- NOTIFICATION BLIPAY- PROMOTION APACHE KAFKA 1. HTTP Request 2. HTTP Request 3. SaveMemberEvent 4. SaveMemberEvent 4. SaveMemberEvent EVENT-DRIVEN ARHITECTURE

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REFUND MEMBER CASH BLIPAY-API BLIPAY-MEMBER BLIPAY- MERCHANT BLIPAY-CORE BLIPAY-PAYMENT BLIPAY- NOTIFICATION BLIPAY- PROMOTION APACHE KAFKA 1. HTTP Request 2. HTTP Request 4. SaveBalanceEvent 3. Some Events 4. SaveTransactionEvent EVENT-DRIVEN ARHITECTURE

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GET MEMBER + BALANCE BLIPAY-API BLIPAY-MEMBER BLIPAY- MERCHANT BLIPAY-CORE BLIPAY-PAYMENT BLIPAY- NOTIFICATION BLIPAY- PROMOTION APACHE KAFKA 1. HTTP Request 2. HTTP Request EVENT-DRIVEN ARHITECTURE

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RECEIVE PAYMENT FROM BANK BLIPAY-API BLIPAY-MEMBER BLIPAY- MERCHANT BLIPAY-CORE BLIPAY-PAYMENT BLIPAY- NOTIFICATION BLIPAY- PROMOTION APACHE KAFKA 1. HTTP Request 2. HTTP Request 3. SavePaymentEvent 4. SavePaymentEvent 4. SavePaymentEvent 5. SaveBalanceEvent 6. SaveBalanceEvent EVENT-DRIVEN ARHITECTURE

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ANY QUESTION? https://www.blibli.com/page/karir/ EVENT-DRIVEN ARHITECTURE https://medium.com/bliblidotcom-techblog