
actor-core
🎭 Stateful serverless framework for Rivet, Cloudflare Workers, Bun, and Node.js. Build AI agents, realtime apps, game servers, and more.
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Actor-core is a lightweight and flexible library for building actor-based concurrent applications in Java. It provides a simple API for creating and managing actors, as well as handling message passing between actors. With actor-core, developers can easily implement scalable and fault-tolerant systems using the actor model.
README:
The modern way to build multiplayer, realtime, or AI agent backends.
Runs on Rivet, Cloudflare Workers, Bun, and Node.js. Integrates with Hono and Redis.
- 💾 Persistent, In-Memory State: Fast in-memory access with built-in durability — no external databases or caches needed.
- ⚡ Ultra-Fast State Updates: Real-time state updates with ultra-low latency, powered by co-locating compute and data.
- 🔋 Batteries Included: Integrated support for state, actions, events, scheduling, and multiplayer — no extra boilerplate code needed.
- 🖥️ Serverless & Scalable: Effortless scaling, scale-to-zero, and easy deployments on any serverless runtime.
- 💾 State: Fast in-memory access with built-in durability.
- 💻 Actions: Callable functions for seamless client-server communication.
- 📡 Events: Real-time event handling and broadcasting.
- ⏰ Scheduling: Timed tasks and operations management.
- 🌐 Connections & Multiplayer: Manage connections and multiplayer interactions.
- 🏷️ Metadata: Store and manage additional data attributes.
ActorCore provides a solid foundation with the features you'd expect for modern apps.
Feature | ActorCore | Durable Objects | Socket.io | Redis | AWS Lambda |
---|---|---|---|---|---|
In-Memory State | ✓ | ✓ | ✓ | ✓ | |
Persisted State | ✓ | ✓ | |||
Actions (RPC) | ✓ | ✓ | ✓ | ✓ | |
Events (Pub/Sub) | ✓ | - | ✓ | ✓ | |
Scheduling | ✓ | - | - | ||
Edge Computing | ✓ † | ✓ | ✓ | ||
No Vendor Lock | ✓ | ✓ | ✓ |
- = requires significant boilerplate code or external service
† = on supported platforms
Run this command:
npx create-actor@latest
Create Actor
import { actor, setup } from "actor-core";
const chatRoom = actor({
state: { messages: [] },
actions: {
// receive an action call from the client
sendMessage: (c, username: string, message: string) => {
// save message to persistent storage
c.state.messages.push({ username, message });
// broadcast message to all clients
c.broadcast("newMessage", username, message);
},
// allow client to request message history
getMessages: (c) => c.state.messages
},
});
export const app = setup({
actors: { chatRoom },
cors: { origin: "http://localhost:8080" }
});
export type App = typeof app;
Connect to Actor
import { createClient } from "actor-core/client";
import type { App } from "../src/index";
const client = createClient<App>(/* manager endpoint */);
// connect to chat room
const chatRoom = await client.chatRoom.get({ channel: "random" });
// listen for new messages
chatRoom.on("newMessage", (username: string, message: string) =>
console.log(`Message from ${username}: ${message}`),
);
// send message to room
await chatRoom.sendMessage("william", "All the world's a stage.");
- Join our Discord
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- File bug reports in GitHub Issues
- Post questions & ideas in GitHub Discussions
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