Adapters

Platform adapters implement the ports defined by the Cascade kernel, following the Hexagonal Architecture pattern.

UI Rendering Adapters

Appsmith Renderer

Low-code UI builder integration for rapid application development.

Schema-driven UI generation
Drag-and-drop interface building
Real-time data binding

React JSON Schema Form (RJSF)

Dynamic form generation from JSON Schema definitions.

Automatic form validation
Custom widget support
Theme customization

ECharts

Advanced data visualization and charting library integration.

Interactive charts and graphs
Real-time data updates
Extensive chart types

Orchestration Adapters

Temporal

Durable workflow execution engine with state persistence and fault tolerance.

Workflow versioning
Activity retries
Event-driven execution
State snapshots

Storage Adapters

PostgreSQL

Relational database adapter for persistent storage with full ACID compliance.

Transaction support
Query optimization
Connection pooling

Redis

In-memory cache and pub/sub adapter for high-performance data access.

Key-value storage
Pub/Sub messaging
Session management

Policy Adapters

OPA (Open Policy Agent)

Rego-based policy evaluation engine for flexible business rules.

Declarative policy language
Policy testing framework
Integration with external data

Camunda DMN

Decision Model and Notation engine for complex decision logic.

Visual decision modeling
Decision tables
Expression language (FEEL)

Implementation Guide

Each adapter is a pluggable implementation of one or more port interfaces. This design ensures:

Swappability - Change implementations without code changes
Testability - Mock adapters for unit testing
Extensibility - Add new adapters easily
Isolation - Adapters don’t depend on each other

Architecture Pattern


┌─────────────────┐
│   Application   │  (Your CDL)
└────────┬────────┘
         │
┌────────▼────────┐
│   Kernel/Core   │  (Business Logic)
└────────┬────────┘
         │
┌────────▼────────┐
│     Ports       │  (Interfaces)
└────────┬────────┘
         │
┌────────▼────────┐
│    Adapters     │  (Implementations)
└─────────────────┘

Adding Custom Adapters

To create a custom adapter:

Implement the Port Interface - Follow the port specification
Register the Adapter - Add to the adapter registry
Configure - Add configuration to your application
Test - Unit test with mocks, integration test with real adapter

See the Ports documentation for detailed interface definitions.