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In this article I'll demonstrate how the Adapter pattern, one of the most common design patterns, can be used to adapt a local class to a remote class. Novice programmers often resort to odd naming conventions to distinguish local behavior from remote behavior, and, with the addition of new remote services, the remote class can easily grow into a big mess that performs poorly under remote network traffic. However, I've seen many designs that build upon the Sun example and become unwieldy as new functions are added. In fact, Sun's Java tutorial provides an excellent example for creating your first RMI server and client and for running a remote system. If you use Java's Remote Method Invocation (RMI), you know that it's easy to understand and implement: The perfect recipe for creating remote objects and services. Here, we have created a class named ImplExample and implemented the interface Hello created in the previous step and provided body for this method which prints a message.Design networked applications in RMI using the Adapter design pattern.
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Provide implementation to all the abstract methods of the remote interface.įollowing is an implementation class.Implement the interface created in the previous step.(We can write an implementation class separately or we can directly make the server program implement this interface.) We need to implement the remote interface created in the earlier step. Creating Remote interface for our applicationĭeveloping the Implementation Class (Remote Object) Here we have defined an interface with the name Hello and it has a method called printMsg(). Since there is a chance of network issues during remote calls, an exception named RemoteException may occur throw it.įollowing is an example of a remote interface. The client communicates with this remote interface.Ĭreate an interface that extends the predefined interface Remote which belongs to the package.ĭeclare all the business methods that can be invoked by the client in this interface. Develop the implementation class (remote object)Ī remote interface provides the description of all the methods of a particular remote object.To write an RMI Java application, you would have to follow the steps given below −
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