Implements publish-subscribe model. Has three types of services:

Accepts connections from publishers and clients. Also provide routing all messages. After new client's connection the broker sends all messages from the last 30 minutes.

Listens for messages from subscribed topics. Prints all messages to console.

Sends new messages to broker.

Starting a central server on port 3001:

node ps-broker 3001

Starting a publisher, which connects to central server on port 3001 and we are sending a message with topic cars:

node ps-publisher 3001
> cars the new BMW rocks!

Starting a client, which connects to central server on port 3001 and listens for new messages on these topics: money, cars, girls. We are receiving the first message.

node ps-client 3001 money cars girls
 [cars] the new BMW rocks!

Uses MongoDB and Redis. Stores the messages to mongo and stores clients' subscriptions to Redis.

##How to start using the app ####Install server-side resources:

npm install
```

####Install web client's dependencies:

bower install

####Start the webclient-server

node app

####Start the websocket-server

node ps-broker 3001

####Open the app in browser

url: http://localhost:3000