Microservices and Event-Driven Architecture

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A Brief History of Time…

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® 2019 Amazon Web Services Inc. or its Affiliates. All rights reserved. Traditional Application UI Logic Shop UI E-commerce GUI Order DAO Checkout API E-commerce Backend Application E-commerce Single Database Search API Product DAO Customer DAO

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® 2019 Amazon Web Services Inc. or its Affiliates. All rights reserved. SOA Application UI Logic Shop UI E-commerce GUI Orders DB Database Products DB Database Order Logic Order API Orders Application Product Logic Product API Products Application

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® 2019 Amazon Web Services Inc. or its Affiliates. All rights reserved. Microservices UI Logic Shop UI E-commerce GUI Order DAO Order API Orders Application Orders DB Product DAO Product API Products Application Products DB Custom. DAO Custom. API Customers Application Customers DB

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® 2019 Amazon Web Services Inc. or its Affiliates. All rights reserved. Point-to-point Couplings Order Service UI Logic Shop UI E-commerce GUI Product Service Customer Service Checkout Service Some kind of problems: • Crash of service • Slow response time • Change of interface

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® 2019 Amazon Web Services Inc. or its Affiliates. All rights reserved. Event-Driven Simple Pattern for Streaming Data Data Producer Continuously creates data Continuously writes data to a stream Can be almost anything Durably stores data Provides temporary buffer that preps data Supports very high- throughput Continuously process data Cleans, prepares, and Aggregates Transforms data to information Streaming Service Data Consumer

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® 2019 Amazon Web Services Inc. or its Affiliates. All rights reserved. Event Sourcing vs Event Store Persists the state of a entity as a sequence of state-changing events Whenever state of entity changes, a new event is appended to the list of events Saving an event is a single operation (atomic) The application reconstructs an entity’s current state by replaying the events

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® 2019 Amazon Web Services Inc. or its Affiliates. All rights reserved. Old Idea? Operational/Transactional Database vs Reporting/Analytical Database https://martinfowler.com/bliki/ReportingDatabase.html OLTP vs OLAP

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® 2019 Amazon Web Services Inc. or its Affiliates. All rights reserved. CQRS – Command Query Responsibility Segregation https://martinfowler.com/bliki/CQRS.html - 2011 Command Service Write Data Store Query Service Read Data Store Command that trigger change in state Query that provide read access to the state *One alternative for CQRS implementation

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® 2019 Amazon Web Services Inc. or its Affiliates. All rights reserved. Event Sourcing & CQRS Command Service Data Store Query Service Materialized View Command Query *Another alternative for CQRS implementation Event Store Command Handler Optimize different nonfunctional requirements for read and write Write Delay Eventual Consistency Database as event publisher (optional) Data Projection and Materialized View

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® 2019 Amazon Web Services Inc. or its Affiliates. All rights reserved. Eventual Consistency Credits: https://www.flaticon.com/br/autores/icongeek26 Drink = “beer” Drink = “vodka” Drink = “vodka” Drink = “beer” Drink = “beer” Drink = ? Drink = “beer” Drink = “vodka”

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Eventual Consistency Credits: http://pjousselin.free.fr/

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Governance and Event Catalog Temporal Semantics Channels and Data Security Event Versioning Clustered Event Sourcing and Assured Delivery Change Data Capture over Streams Monitoring and Fitness Functions for EDA We are here! Complex Event Processing Backpressure and Exponential Backoff Projections and Aggregates