Overview

• Need for reactive applications
• Applications should respond fast and have low latencies.
• Applications should be highly available.
• Application should be scalable that is should meet users demand
• Application should be failure, resilient
• Respond in a timely manner
• This demand requires reactive backend applications.
• Vertx Is a tool kit to build reactive applications on a Java virtual machine.
• It has found its way into cloud native framework Quarkus.
• Reactive system has many applications and frameworks, adapting it.
• Reactive system has following characteristics
• Elastic
• Elastic means that we can scale up the number of JVM threads or Processes To handle more load.
• Responsive
• React to requests
• Return responses Quickly
• Success or failure
• Scale up on high load
• Avoid timeouts
• The responsiveness should be guaranteed by scaling up more instances and making sure to meet the users demand.
• Resilient
• Resilient means that we can react to failure and not crash the application, but instead be able to recover from it and service all requests For users of our application.
• Message Driven
• Reacts To events by combining it with asynchronous Programming and asynchronous message handling.
• The application is able to avoid undefined status of overload and scale out to have more event handlers.
• In Vertex This is handled using
• Vertex event loops
• Verticals, which are actor like deployment models
• These verticals communicate over the vertex event, bus via Messages, and by using promise and future. It allows asynchronous programming.
• A monolithic application avoids inter-service communication, but it very likely Exposes an API Which is avoidable to other systems or directly with user interface.
• Every time an application is interactingwith other systems, applying the reactive principles makes them more reliable.
• The HTTP server is reactive, and also the data access layer.
• In a micro service architecture reactive approach Is more important, if a service is not available, then the calling micro service should still respond fast and handle this error case properly.
• Vertex components
• Vertex core
• Verticals
• Event loop
• Event bus
• Promise and future
• Vertex web
• Routing
• Web server
• Web client
• Vertex config
• Env
• Xaml
• Vertex data-reactive SQL clients
• SQL template
• Postgres SQL
• My SQL
• Flyway
• Vertex reactive
• Mutiny
• Quarkus
• Quarkus is a modern cloud native Java framework, which is using vertex under the hood.
• Vertex web sockets
• Socket server
• Socket client