Dapr for Java Developers (JJUG)

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The evolution of cloud native software (Dapr for Java Developers) &

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https://www.diagrid.io/blog/dapr-for-java-developers https://www.diagrid.io/blog/dapr-for-spring-boot

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@Salaboy Mauricio Salatino Software Engineer @ Diagrid https://salaboy.com

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Why am I here? I am here to gather feedback from the Java community. Spring Boot and Quarkus integrations are in active development, we need feedback. It is a great opportunity to contribute to an Open Source project with your Java expertise.

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Agenda 1. Introduction a. Development challenges b. Kubernetes & Containers c. What are our applications doing 80% of the time? 2. What is Dapr? Why should I care? 3. Demo

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The challenge: to focus on what matters Developers are often distracted with details around: All this to solve business problems! Application Conﬁguration Libraries and Dependencies … more, and more non-functional requirements Infrastructure Environment Runtime

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Some time ago ... Application Servers • Security • Transaction management • Connection pools • Service discovery • Messaging • Load balancing • etc …

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But… • Shared CPU, memory and File System • Apps depends on the application server's libraries • ClassLoader issues • Promoted silo-ed operations vs development

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With the rise of containers • Conventions over conﬁguration • Simplicity • One JVM per application • Much more aligned for microservices • A better development and runtime environment

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Containerized Java Application

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But… I still need to worry about libraries/dependencies and some core services that were once provided by application servers.

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Application on Kubernetes

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Java on Kubernetes

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But what are our applications doing 80% of the time? • How many of your applications are reading or storing data? • How many of your applications are consuming and emitting events? • How many of your applications are calling other services?

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The challenge: to focus on what matters Developers are often distracted with details around: All this to solve business problems! Environment Runtime Libraries and Dependencies Infrastructure Application Conﬁguration ✅ ✅

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The challenge now is abstract infra and libs

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dapr.io

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What is Dapr? Why you should care? • Distributed application runtime • A Kubernetes Extension • Provides application-level APIs to interact with other services and infrastructure

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With Dapr

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For example: producer -> consumer apps

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For example: producer -> consume apps

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Let’s run this app on Kubernetes • To run this app in Kubernetes: • Create a cluster • Install Dapr • Install RabbitMQ and PostgreSQL • Install the app services

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Diagrid Conductor https://conductor.diagrid.io/

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Ok, but.. This is way too much for developers! To get this working we need: • A Kubernetes Cluster • Install Dapr • Conﬁgure infrastructure to be accessible using Components • Write a lot of YAML

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The Dapr Java SDK

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Creating a Dapr Client and using the APIs

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Creating a Dapr Client and using the APIs

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Creating a Dapr Client and using the APIs

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Creating a Dapr Client and using the APIs

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Java APIs and Spring - Spring developers expect the “client” lifecycle to be managed - Spring developers already know how to: - Deal with state (Spring Data) - Publishing and subscribing to messages (Spring Kafka, Pulsar, RabbitMQ) - Scheduling async Jobs with @Scheduled 👀👀 👀

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Dapr for Spring Boot - Dapr integrates nicely with the Spring & Spring Boot ecosystem - Spring developers can use the Dapr APIs without the need of a Kubernetes Cluster or even installing Dapr - It relies on Testcontainers to bootstrap Dapr from your Spring Boot applications - It integrates the Dapr APIs with the Spring programming model

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The Dapr Spring Boot Starter ● State management ● PubSub ● Secrets ● Workﬂows ● Among other APIs

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@Autowired Dapr Client

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Testing Dapr-enabled Spring Boot apps Dapr Sidecar Dapr Control Plane Services Spring Boot Application Infrastructure

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Testing Dapr-enabled Spring Boot apps Dapr Sidecar Dapr Control Plane Services Message Broker Spring Boot Application DB

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Dapr & the Spring programming model - Spring developers use Spring Data to store and retrieve data - Spring developers use Spring Messaging to publish and subscribe to messages - Workﬂows and Spring Developers

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Spring Data and Repositories

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Spring Data and Repositories

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How it works? App Dapr Sidecar Dapr Control Plane Services Spring Data Repository KeyValue Store DaprClient The app doesn’t have any dependency to the infrastructure Dapr handles the connection pool and adds resiliency policies to all connections with infrastructure

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Spring Messaging (Kafka, Pulsar, RabbitMQ)

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Subscribe to async messages

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How it works? App DaprClient The app doesn’t have any dependency to the infrastructure Dapr handles the connection pool and adds resiliency policies to all connections with infrastructure Dapr Sidecar Dapr Control Plane Services Spring Messaging Kafka

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Dapr Workﬂows for Durable executions Register Customer Book Customer Follow up Wait for Customer to reachout Create complex service orchestrations that are fault tolerant and resilient.

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Integrating with your existing systems

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Interacting with workﬂows

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Helping devs to focus on what matters Let’s code some new features! Environment Runtime Libraries and Dependencies Infrastructure Application Conﬁguration ✅ ✅ ✅ ✅

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We need your help We need your help to make this integration awesome! Get in touch if you want to contribute. I am happy to mentor anyone who wants to contribute to Open Source.

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ご静聴ありがとうございました ! @salaboy / @daprdev / @diagridio dapr.io diagrid.io diagrid.io