Microservices Data Patterns

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Microservice Data Patterns: CQRS & Event Sourcing Edson Yanaga Director of Developer Experience @yanaga

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Join developers.redhat.com 2 Java Champion Microsoft MVP

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http://developers.redhat.com/promotions/ migrating-to-microservice-databases

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Code is easy, state is hard

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How was data managed 10 years ago?

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Terriﬁed about Entity Beans

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Hibernate to the rescue!

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Replacing XML with @Annotations

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POJOs as an (Anemic) Domain Model

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Event Sourcing

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Join developers.redhat.com 11 ID CUSTOMER_ID BALANCE 1001 990 1000 1002 991 0 1003 991 -500 1004 992 300 Account

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Enables you to think in the Events that happened in the system

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CQS (Command-Query Separation) “Asking a question should not change the answer” (Bertrand Meyer)

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“Asking a question should not change the answer” (Bertrand Meyer)

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CQRS (Command Query Responsibility Segregation)

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Join developers.redhat.com 17 CQRS (Command Query Responsibility Segregation)

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Join developers.redhat.com 18 ID NAME PHONE ADDRESS BIRTH 1 Burr 222-222-2323 901 South St 12/12/1968 2 Edson 222-333-3434 112 North Dr 03/03/1978 3 John 111-456-4545 666 Iron St 06/06/1966 4 Doe 333-789-7890 777 Boeing Dr 07/07/1977 INSERT INTO CUSTOMER(ID,NAME,PHONE,ADDRESS,BIRTH); SELECT * FROM CUSTOMER;

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Join developers.redhat.com 19 SELECT ID, NAME, PHONE FROM CUSTOMER; SELECT ID, NAME, ADDRESS FROM CUSTOMER;

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Join developers.redhat.com 20 CQRS with separate data stores

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Join developers.redhat.com 21 SELECT ID, NAME, AGE, AVG_BILL FROM CUSTOMER_REPORT_VIEW; SELECT ID, PHONE, LAST_PAYMENT_AMOUNT FROM CUSTOMER_BILLING_VIEW;

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CQRS & Event Sourcing

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Why CQRS?

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Performance

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Distribution Availability Integration Analytics

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Join developers.redhat.com 28 Canonical Source of Information (Write Data Store)

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Join developers.redhat.com 29 Canonical Source of Information (Write Data Store) Read Data Store Read Data Store

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Join developers.redhat.com 30 Canonical Source of Information (Write Data Store) Read Data Store Read Data Store Events Events

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Different choices of technology depending on the requirements

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Latency Size Staleness Ownership Security Type?

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Join developers.redhat.com 33 http://inﬁnispan.org/ In-memory Data Grids

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Join developers.redhat.com 34 http://teiid.jboss.org/ Data Virtualization

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Join developers.redhat.com 35 http://activemq.apache.org/ Message Brokers https://kafka.apache.org/

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Join developers.redhat.com 36 http://vertx.io/ Reactive Platform

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Join developers.redhat.com 37 REMOTE API

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Join developers.redhat.com 38 REMOTE API REACTIVE

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Join developers.redhat.com 39 http://debezium.io/ Change Data Capture

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Join developers.redhat.com Feedback welcome! @yanaga

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