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Framework-Agnostic Nodes in LangGraph4j — The Adapter Pattern, Explained
Part one built a two-node LangGraph4j graph and used it to explain state, channels, and checkpoints. Part two added cross-cutting tracing without touching ei...
Node Hooks in LangGraph4j, applyBefore, applyWrap, and applyAfter Explained
Last time we built a two-node LangGraph4j graph, a translator that pauses to ask a clarifying question, and used it to explain the real engine behind every L...
State Management in LangGraph4j Channels Reducers and a Human in the Loop Example
If you’ve built anything with LangGraph4j beyond a hello-world chain, you’ve hit the real question behind every graph: how does data move between nodes? The ...
Abstract Factory Design Pattern
Abstract Factory is a creational pattern for creating families of related objects together, without naming their concrete classes and guaranteeing the pie...