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Unverified90% confidenceFactTime unknown

LangChain的回调系统是一套观察者模式（Observer Pattern）的实现，允许开发者在Chain或Agent执行的各个生命周期节点注入自定义逻辑

1

Sources

90%

Confidence

Medium-term (~90 days)

Relevance

5/31/2026

First Seen

Valid until: 8/29/2026

Sources

LangChain流式输出与异步实战：Agent场景完整实现

youtubeJames Briggs

Related Entities

LangChainproduct Observer Patternconcept

Related Claims

UnverifiedLangChain引入了链式调用（Chain）和代理（Agent）两种范式，前者适合固定流程顺序任务，后者适合动态推断下一步的开放任务78% similar VerifiedLangChain基于ReAct（Reasoning + Acting）思维-行动循环模式，提供通用的工具链编排框架77% similar VerifiedLangGraph是LangChain团队推出的Agent编排框架，其核心理念是将Agent的执行流程建模为有向图（DAG），支持循环、条件分支等复杂控制流76% similar Unverified与 LangChain 的链式调用不同，LangGraph 支持循环、条件分支和状态持久化，适合需要迭代推理的 Agent 场景75% similar UnverifiedLangChain的AgentExecutor是ReAct机制的工程实现，负责协调LLM与工具之间的交互、管理中间状态并处理异常74% similar

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