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#ColdFusion WebSocket Gateway#

This is a ColdFusion event gateway for WebSocket messaging. This implementation is based on the Webbit server.

An alternate implementation of this gateway based on the Java-WebSocket server is available in the java-websocket branch.

Installing the Gateway

• Downlaod the cf-websocket-gateway-webbit-2.0.zip package from Github.
• Extract the cf-websocket-gateway-2.0.jar, netty-3.2.6.Final.jar, and the webbit-0.3.0.jar to the ColdFusion classpath.
  • The best place to put the jar is in the {cfusion.root}/gateway/lib folder. For example C:\ColdFusion9\gateway\lib or /Applications/JRun4/servers/cfusion/cfusion-ear/cfusion-war/WEB-INF/cfusion/gateway/lib/
• Restart ColdFusion, if necessary.
• Log in to the ColdFusion administrator and navigate to the Event Gateways > Gateway Types page.
• Under Add / Edit ColdFusion Event Gateway Types enter the following:
  • Type Name: WebSocket
  • Description: Handles WebSocket Messaging
  • Java Class: org.riaforge.websocketgateway.WebSocketGateway
  • Startup Timeout: 30 seconds
  • Stop on Startup Timeout: checked

Configuring the Gateway

• Log in to the ColdFusion administrator and navigate to the Event Gateways > Gateway Instances page.
• Under Add / Edit ColdFusion Event Gateway Instances enter the following:
  • Gateway ID: An name for your gateway instance.
  • Gateway Type: WebSocket - Handles WebSocket Messaging
  • CFC Path: Path to the CFC listner. For more about the listener CFC see Handling Incoming Messages.
  • Configuration File: The path to the (optional) configuration file. If not provided the WebSocket server will listen on port 1225. Below is a sample configuration file.

# port - The port the WebSocket server should listen on.
port=1225

Handling Incoming Messages

Events

The CFC listener may implement any of the three following methods to listen to WebSocket Gateway events:

• onClose(event) - sent when a client connection is closed. The event has the following fields:
  • CfcMethod: Listener CFC method name, onClientClose in this case
  • Data.CONN: The underlying org.riaforge.websocketgateway.WebSocket object that fired the event
  • GatewayType: Always "WebSocket"
  • OriginatorID: A key identifying the underlying org.riaforge.websocketgateway.WebSocket object that fired the event
• onOpen(event) - sent when a client connection is opened. The event has the following fields:
  • CfcMethod: Listener CFC method name, onClientOpen in this case
  • Data.CONN: The underlying org.riaforge.websocketgateway.WebSocket object that fired the event
  • GatewayType: Always "WebSocket"
  • OriginatorID: A key identifying the underlying org.riaforge.websocketgateway.WebSocket object that fired the event
• onIncomingMessage(event) - sent when a client sends a message. The event has the following fields:
  • CfcMethod: Listener CFC method, onIncomingMessage in this case
  • Data.CONN: The underlying org.riaforge.websocketgateway.WebSocket object that fired the event
  • Data.MESSAGE: Message contents
  • GatewayType: Always "WebSocket"
  • OriginatorID: A key identifying the underlying org.riaforge.websocketgateway.WebSocket object that fired the event

Targeted Messaging

By default outgoing messages are sent to all connected WebSocket clients. You may target an outgoing message such that it is only sent to a single client or subset of connected clients using either the DESTINATIONWEBSOCKETID or DESTINATIONWEBSOCKETIDS event fields. To send to a single client the DESTINATIONWEBSOCKETID field should be set to the key of the targeted client. To send to a subset of clients, the DESTINATIONWEBSOCKETIDS field should be set to an array of target keys.

Example Listeners

Below is an example listener CFC that echos a message back to all connected clients:

<cfcomponent>
  <cffunction name="onIncomingMessage">
    <cfargument name="event" />
    <cfset var msg = {} />
    <cfset msg["MESSAGE"] = event.data.message />
    <cfreturn msg />
  </cffunction>
</cfcomponent>

Below is an example listener CFC that echos a message back to the client that sent the message:

<cfcomponent>
  <cffunction name="onIncomingMessage">
    <cfargument name="event" />
    <cfset var msg = {} />
    <cfset msg["MESSAGE"] = event.data.message />
    <cfset msg["DESTINATIONWEBSOCKETID"] = event.originatorID />
    <cfreturn msg />
  </cffunction>
</cfcomponent>