Realtime Application with MongoDB and Socket.io
This application shows how to use MongoDB to create a pub/sub based application.
It uses :
- MongoDB Capped Collections and Tailable Cursors
- node.js
Step 1 : Capped Collection and Tailable Cursors with node.js
See branch step-01
Installation:
1- Create a new database
use chat
2- Create a Capped Collection
db.createCollection('messages', { capped: true, size: 100000 });
3- Insert a dummy document
db.messages.insert({"type":"init"});
4- Install node modules
npm install
5- Start application
node app
6- Insert new documents in the collection
db.messages.insert({"type":"message", "text":"New message"});
You can see that message is capture by the node application
Step 2 : Adding User Interface with Socket.io
See branch step-02
In this step, the application has been improved to send message to an HTML client using socket.io.
Once you hace checked out the step-02 branch and updated the dependencies npm install :
1- Start the application
node app
2- Open your browser and go to:
3- Insert new messages in the collection
db.messages.insert({"type":"message", "text":"New message pushed in web client"});