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The IChannel interface defines the basic functionality of a transport channel. Transport channels are used for crossing remoting boundaries, which can be contexts, AppDomains, and processes, as well as machines. Channels implement the specifics of the transport protocol (e.g., TCP or HTTP) and can listen on transport protocol ports as well as send messages through transport protocol streams. That said, channels have to cover inbound as well as outbound communication with remote objects. They provide an extensibility point in the runtime for adding custom transport protocols to the .NET Remoting infrastructure. Interface definition: public interface IChannel { string Parse(string url, [out] ref string objectURI); string ChannelName { get; } int ChannelPriority { get; } } As you can see, each channel has to implement a method for parsing the remote object s URL as well as provide properties for the channel s name and its priority in the list of channels. Both roles, the listening portion as well as the sending portion, are expressed through the subinterfaces IChannelReceiver and IChannelSender described in the next two sections of this appendix.

The events triggered differ and allow for different approaches to interacting with the HTTP request. Binary responses are handled differently. URL variable and parameter manipulation possibilities vary. Support for HTTP methods is not identical.

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Here s the enemyCollision method from the TileCollisionController class: public function enemyCollision (gameObject:TileModel, enemy:TileModel):Boolean { var gameObject_Radius:Number = gameObject.width * 0.5; var enemy_Radius:Number = enemy.width * 0.5; var enemySquashed:Boolean = false; //Vector between circles //Measure from the center points var v0:VectorModel = new VectorModel ( gameObject.xPos + gameObject_Radius, gameObject.yPos + gameObject_Radius, enemy.xPos + enemy_Radius, enemy.yPos + enemy_Radius ); //Calculate the radii of both circles combined var totalRadii:Number = gameObject_Radius + enemy_Radius; //If the totalRadii is less than the distance //between the objects and the cat is above the enemy if(v0.m < totalRadii && gameObject.yPos + enemy_Radius < enemy.yPos) { //A collision is happening. //Find the amount of overlap between circles var overlap:Number = totalRadii - v0.m; gameObject.setX = gameObject.xPos - (overlap * v0.dx); gameObject.setY = gameObject.yPos - (overlap * v0.dy); //The cat's motion vector var v1:VectorModel = new VectorModel ( gameObject.xPos, gameObject.yPos, gameObject.xPos + gameObject.vx, gameObject.yPos + gameObject.vy );

references: 4: Configuration and Deployment 12: Creation of Sinks 13: Extending .NET Remoting 14: Developing a Transport Channel More information on MSDN: http://msdn.microsoft.com/library/en-us/cpref/html/ frlrfsystemruntimeremotingchannelsichannelclasstopic.asp

The URLLoader class defines the following events:

//Create the cat's bounce vector var bounce_Player:VectorModel = VectorMath.bounce(v1, v0.ln); //Bounce the cat gameObject.vx = bounce_Player.vx; gameObject.vy = bounce_Player.vy; enemySquashed = true; } else { //No collision } return enemySquashed; } This is a distance-based collision check. If the method returns true, _enemySquashed is set to true, and the application class stops blitting the hedgehog and stops checking for a collision.

complete (flash.events.Event.COMPLETE): Dispatched when the data is decoded and assigned to the data property of the URLLoader object. This is a good time to start using the loaded resource. httpStatus (flash.events.HTTPStatusEvent.HTTP_STATUS): Dispatched if the load method invokes a call over HTTP. URLLoader is not restricted to making HTTP calls, although it s a popular choice. This event is triggered on an HTTP request, not a response, and it s triggered before the complete and error events. ioError (flash.events.IOErrorEvent.IO_ERROR): Dispatched if the request encounters a fatal I/O error and terminates the request. open (flash.events.Event.OPEN): Dispatched when the request starts on invocation of the load method. progress (flash.events.ProgressEvent.PROGRESS): Dispatched as the resource gets downloaded. This event is most relevant when the resource is large, say a huge image file, and it downloads incrementally. A progress event is fired on each chunk of bytes getting downloaded. securityError (flash.events.SecurityErrorEvent.SECURITY_ERROR): Dispatched if the security sandbox is violated.

The IChannelReceiver interface, an extension of the IChannel interface, defines the functionality that has to be provided for receiving channels. This means the receiver listens on a specific transport protocol port and waits for incoming messages. Every time a message is received, it takes the message and passes it on to the formatter, which deserializes the message and forwards it to the next sink in the sink chain. That said, IChannelReceiver always has to be the first part in the sink chain of a remoting application that is able to receive messages from remote objects. Interface definition: public interface IChannelReceiver : IChannel { string[] GetUrlsForUri(string objectURI); void StartListening(object data); void StopListening(object data); object ChannelData { get; } } Usually, a receiving channel is used on the server side, waiting for incoming requests of clients. If you keep configuration in mind, you are specifying an object URI only and not the whole URL. Therefore, the receiving channel needs to provide functionality for creating the real URL out of the specified object URI, which is encapsulated in the GetUrlsForUri() method of the interface. Furthermore, the channel knows how to start listening as well as stop listening on the transport protocols port, and therefore needs to provide functionality for doing so. The ChannelData property provides access to additional channel properties. references: 4: Configuration and Deployment 12: Creation of Sinks 13: Extending .NET Remoting 14: Developing a Transport Channel

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