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Marshalling objects by value means to serialize their state (instance variables), including all objects referenced by instance variables, to some persistent form from which they can be deserialized in a different context. This ability to serialize objects is provided by the .NET Framework when you set the attribute [Serializable] for a class or implement ISerializable. When passing the Customer object in the previous chapter s validation example to the server, it is serialized to XML like this: <a1:Customer id="ref-4"> <FirstName id="ref-5">Joe</FirstName> <LastName id="ref-6">Smith</LastName> <DateOfBirth>1800-05-12T00:00:00.0000+02:00</DateOfBirth> </a1:Customer> This XML document is read by the server and an exact copy of the object is created.

int i, len = sourceString.length(); StringBuffer dest = new StringBuffer(len); for (i = (len - 1); i >= 0; i--) dest.append(sourceString.charAt(i)); return dest.toString(); } }

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//Calculate the angle and acceleration _angle = rotationValue * (Math.PI / 180); _accelerationX = Math.cos(_angle) * acceleration; _accelerationY = Math.sin(_angle) * acceleration; frictionX = vx * friction; frictionY = vy * friction; //Speed trap: Stop the object moving //if the up arrow isn't being pressed //and its speed falls below 0.1 if(!thrusterFired) { if((Math.abs(vx) < 0.1) && (Math.abs(vy) < 0.1)) { _accelerationX = 0; _accelerationY = 0; frictionX = 0; frictionY = 0; } } //Apply acceleration to the position xPos += _accelerationX + frictionX; yPos += _accelerationY + frictionY; //The temporary values become the //previous positions, which are used calculate velocity previousX = temporaryX; previousY = temporaryY; } This is a very good example of how Verlet integration is typically used. Physical forces, like friction and acceleration, are just added to the object s position: xPos += _accelerationX + _frictionX; yPos += _accelerationY + _frictionY; It s very readable in a common-sense way. It says, The object s position is the result of a combination of acceleration and friction. If you had any more physical forces, you could simply add them in the same way. xPos += _accelerationX + frictionX + wind; yPos += _accelerationY + frictionY + gravity; This is a very elegant way of dealing with physics. See, physics can be easy!

Note An important point to know about ByValue objects is that they are not remote objects. All methods

To use Hessian to communicate from Flex to Java, you employ the Hessian client-side library for Flash/Flex. You can download the SWC library file from the Hessian home page (http://hessian.caucho.com/). For Flex, you need to get hessian-flex- version_number .swc from the binary distribution list. You ll also find links to API documentation and example applications (including server-side push using Comet) on this page. The Hessian Flash/Flex client library uses mx.rpc.AbstractService and mx.rpc.AbstractOperations like the libraries for XML-RPC, JSON-RPC, WebService, and RemoteService. The service that manages RPC extends AbstractService, and the remote methods map to AbstractOperations. The primary component is abstracted as HessianService, and that s where you configure the remote Hessian destination. In MXML, this tag looks like this:

And nowhere is the object looking to its velocity to help it figure out where to move next. The only place velocity is explicitly referenced is to work out friction. frictionX = vx * friction; frictionY = vy * friction; But even that s unnecessary. You could remove all references to vx and vy completely if you wanted to do that. You could just as easily use a line of code that looks like this: frictionX = (xPos - previousX) * friction; frictionY = (yPos - previousY) * friction; Our little velocity engine is running quietly in the background, and the code really doesn t need to directly interact with it in any way.

<hessian:HessianService xmlns:hessian="hessian.mxml.*" id="hessianService" destination="remoteDestination"/>

on those objects will be executed locally (in the same context) to the caller.. This also means that, unlike with MarshalByRefObjects, the compiled class has to be available to the client. You can see this in the preceding snippet, where age is not serialized but will be recalculated at the client using the GetAge() method.

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