Download e-book for iPad: Advanced .NET Remoting by Ingo Rammer (auth.)

By Ingo Rammer (auth.)

ISBN-10: 1430208333

ISBN-13: 9781430208334

ISBN-10: 1590590252

ISBN-13: 9781590590256

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As a sample business rule, you will check if the customer has been assigned a first name and last name and is between Oand 120 years old. General Assembly In the General assembly extend the interface ICustomerManager to include the method validateO. NET Remoting Basics The ValidationResult is defined as follows. It will be a serializable (transfer by value) object with a constructor to set the necessary values. getAge()j Console. WriteLine ("CustomerManager. Length == o)) { return new ValidationResult(false, "Lastname missing"); } if (age < O I I age > 120) { return new ValidationResult(false,"Customer must be " "younger than 120 years")j + } 23 Chapter2 return new ValidationResult (true, "Validation succeeded") j } This function just checks the given criteria and returns a corresponding ValidationResult object, which contains the state ofthe validation (successlfailure) and some explanatory text.

Lfyou look closely at the startup sequence, you'll notice that the registered class is not directly bound to the channel. In fact, you'd be right in thinking that aU available channels can be used to access aU registered objects. NOTE Implementing the Client The sample client will connect to the server and ask for a Customer object. dU from the preceding step (you will again have to use the Browse button, because you didn't copy the assembly to the GAC). Channels; 19 Chapter2 The void Main () method will register a channel, contact the server to acquire a Customer object, and print a customer's age.

If not, the instance will be garbage collected and disposed. When you apply this schema (or the COM way of reference counting) to remote objects, it pings the client-side proxies to ensure that they are still using the objects and that the application is stiH running (this is mainly what DCOM did). The reason for this is that normally a client that has been closed unexpectedly Of went offline due to a network outage might not have decremented the server-side reference counter. Without some additional measure, these serverside objects would in turn use the server's resources forever.

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Advanced .NET Remoting by Ingo Rammer (auth.)

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