context-engine v0.0.1

context-engine

Usage: Example:

Initialize context server once:

// index.js
const http = require("http");
const expressApp = require("./app");
const httpServer = http.createServer(expressApp);

const { ContextServer } = require("context-engine");
const contextServer = new ContextServer();

contextServer.attach(httpServer);

httpServer.listen(5000, () => console.log("listening on 5000"));

Anywhere in your code:

// app.js
const express = require("express");
const app = express();

const { ContextPublisher } = require("context-engine");
const cp = new ContextPublisher();

app.get("/reject", (req, res) => {
  cp.publish("loveyou", "hateyou");

  res.sendStatus(200);
});

app.get("/accept", (req, res) => {
  cp.publish("loveyou", "loveyoutoo");

  res.sendStatus(200);
});

module.exports = app;

In frontend code (on client side)

// app.js
import { useContextData } from "context-client";
function App() {
  const { data } = useContextData("loveyou", {
    initialData: "waitforyou",
  });

  return <div>{data}</div>;
}

Motivation

Use useContextData anywhere, any components you like.

The topic in useContextData(topic, option) is same as in cp.publish(topic, message), the message will be delivered.

message is a string. For sending and receiving object, use JSON.stringify and JSON.parse, respectively.

data is last message string received.

option is an object, all options available are:

• initialData: Initial value of data, when no new message delivered yet.

Now there is only one. More options (throttling,...) will be supported in future version.