Indigo: Contracts?
Well you all have probably heard about indigo by now. Some of you maybe think: What's the big deal, just throw msmq, webservices, remoting and some other stuff together and tata: indigo.But it's more then that. And one interesting feature, at least one that I consider interesting, is contracts. The Indigo framework has 3 major parts.
Messaging, this contains a bunch of possible messaging channels (SOAP, TCP, Queue,...) and encoders (binary and XML).
Service model, contains behaviors (Error, transaction, instance,...) and facilities ( inspection, control)
And the last part, contracts. This is what I want to talk about in this article.
Indigo messaging works with endpoints. From endpoint to endpoint. And to define an endpoint we need three things, one an address: where is the endpoint? Two, a binding: how do I get to the endpoint? And three a contract: what is the endpoint?
Contracts are used to specify how an endpoint is described to the outside world. It provides an external view or representation.
Indigo has 3 types of contracts. Data contracts, message contracts and service contracts.
A service contract provides an external representation over a message. It is what we used to know as an interface.
A small example of a service contract:
[ServiceContract (Name = “MyServiceContract”)]
public interface IMyServiceContract
{
[OperationContract (Name = “CalculateSomething”)]
void CalculateSomething(double number1, double number2, string operator);
[OperationContract (IsOneWay = true)]
void DifficultCalculate(double number1, double number2, string[] operators);
}
And then the corresponding class:
public class OrderService : IOrderContract
{
void CalculateSomething(double number1, double number2, string operator)
{ // Some code... }
void DifficultCalculate(double number1, double number2, string[] operators)
{ // Some code... }
}
This is what a service contract should look like. If you look closely, you will notice that I supplied the IsOneWay=True attribute in the second method. By default indigo does synchronized communication, but by specifying IsOneWay i tell it that this is a one way communication so the caller will not wait for the method to finish (async).
The second type of contract I mentioned was message contracts.
Message contracts specify how your message looks like. A message contract has a distinction between the body and the header of a message. It specializes a data contract. Logically it is SOAP, but physically it is CLR.
An example:
[MessageContract(Action =“http://calculationrequest ”)]
public sealed class CalculationRequest
{
[MessageHeader]
internal Guid RequestId;
[MessageHeader(
Namespace = http://calculator,
Name = "MyCalc",
MustUnderstand = true,
Relay = false,
Actor = http://calcactor,
Position = 2)
]
internal Guid SessionId;
[MessageBody]
public List
[MessageBody(Namespace = http://calculator, Name = "localcalculator", Position = 2)]
public string OptionalData;
[MessageHeaders]
IList
}
Now for the third kind of contract; data contracts. Data contracts represent the structural schema of your data. It has a new explicit model for serializable types and is fully interoptable with the [Serializable] flag and ISerializable. Another cool trick is that it is version resilient by default.
Again, a small example of what a data contract looks like:
[DataContract]
public class Calculation
{
int _numOfOpp;
[DataMember] public string Status;
[DataMember] private int NumOfOpp{ get { return _numOfOpp; } set { _numOfOpp= value; } }
}
Now what you can do with data contracts, and this is cool, is that you can add a second data contract, for example:
[DataContract (Name=“Calculation”)]
public class ScientificCalculation
{
[DataMember(“Status”)] private string _status;
[DataMember(“NumOfOpp”)] private int _numOfOpp;
}
As you can see the name and the members are exactly the same as they will appear to the outside world, but inside they are completely different. Cool, isn’t it?
You see this is some interesting stuff. And I could talk a lot more about contracts and indigo in general. But then the post would get way to long and my free time way to short :-)
So I promise a follow up on this article. Then I will talk about behaviors in Indigo.
Want more info about Indigo? Check out this article: Indigo contracts and adressing
Any questions or comments? You know how to reach me.
posted by Dave @ 08:24
23 Comments:
Nice article dave. It gives a face to what contracts realy are.
PS maybe we could work out an example together
A couple of weeks ago a great article by David Chappell, explaining the basics of Indigo has been published on the MSDN site. Check it out here.
David
I really enjoyed the content on your blog about Msdn will be back very frequently! I actually have my own Msdn Exposed blog with all kinds of stuff in it. You�re welcome to com by
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