Application

Application Architecture

The following information depicts the components and dependencies that make up the application architecture.

Application Architecture

Components

The following are the default components that are part of the application architecture stack. The Handler can be replaced with a custom implementation, and the Tasks can be replaced with custom implementations.

Component Type Technology Internal to Internal External Ingress Internal Dependency External Dependency
Flow Front End React + Node.js Flow MS true
Workflow Microservice Spring Boot (Java®) Engine MS true MongoDB®
Engine Microservice Spring Boot (Java) Handler MS true MongoDB®
Handler Microservice Spring Boot (Java) false Kubernetes®, Tekton® TaskRun
Task TaskRun Node.js CLI / Container false Kubernetes®, Tekton® TaskRun MongoDB® shell image

Notes:

  1. The Task is dynamically spun up, based on the Workflows being executed.
  2. Kubernetes is required with access to ConfigMaps and PersistentVolumes.
  3. Tekton TaskRuns are required for executing the individual Tasks.
  4. The certified Task worker has implemented, and are bound to, specific RBAC privileges in Kubernetes.
  5. If New Relic® APM is enabled it will run as a side car to the Spring Boot (Java) microservices.

Dependencies

Dependency Implementation Notes
Kubernetes
  • Red Hat® OpenShift® Container Platform (4.2+)
  • IBM Cloud® Kubernetes Service
  • IBM Cloud Red Hat OpenShift Kubernetes Services
  • Microsoft Azure Kubernetes Service
 Kubernetes 1.20+
Tekton TaskRuns Part of Pipelines 0.69.0+
Application Load Balancer NGINX 0.23.0+
Database MongoDB
Message Streaming NATS Jetstream 2.3.4 Optional
Certificate Manager Jetstack Cert Manager (0.7.0) Optional if you have your own TLS certificate as a Kubernetes secret
Logs
  • Kubernetes
  • Grafana Loki
 If logging enabled, default is Kubernetes
Monitoring New Relic Infrastructure, New Relic Kubernetes, New Relic APM Agent If enabled
Tracing Jaeger® If enabled