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Working with the Java Remote Method Invocation API
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6. If you can t find your answer, consider registering (for posting rights) in the forum (it s free). Then, post your question. Since you were to come up with a specific Java technology based question, make sure you place it in the appropriate forum. Remember the etiquette: If it is a real basic question, you may wish to post it to the Java in General (beginner) forum. 7. Check back to the forum regularly to see if an answer to your question has been posted. Note that this and many other forums can send you e-mail notifications when your questions have been responded to.
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Exam Objective 6.2 Describe at a high level the benefits and basic characteristics of RMI. Wouldn t it be great if you could invoke a method from an object on another machine Remote Method Invocation (RMI) technology does just that since it is Java s basic remote procedure call mechanism. This section discusses RMI s main goal, which is to allow for the sharing of Java objects between Java Virtual Machines.
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The Java Remote Method Invocation API resides in the java.rmi package. This API provides the means in which Java applications perform distributed computing. In a classic client-server scenario, the RMI server maintains the remote objects, while the RMI client maintains the client objects that invoke the remote methods. This is done by implementing a remote interface through a client stub. You must understand that all of this work is not performed auto-magic-ally. The developer needs to solicit the creation of the stubs in order for the distributed communications to occur, as shown in Figure 10-4.
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FIgure 10-4
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Client Application Network
Server Application
Remote method invocation
stubs
skeletons
Stubs (client stubs) and skeletons (remote stubs) are created with the commandline utility rmic . Stubs and skeletons have their own key points:
n lient stubs C n he rmic -created stub for the client side is called a stub. T n hen using JDK 1.4 and earlier versions (prior to JDK 5.0), you are W required to use the rmic utility to generate stub classes. n n JDK 5.0 and later, the RMI runtime generates the stub classes I
automatically (by constructing a proxy).
n he client stub s marshal method calls the name and arguments and T
sends them to the skeleton on the server side. After they receive the results from the sender, they return the result back to the method call invoker.
n erver stubs (skeletons) S n he rmic -created stub for the server side is called a skeleton. T n s of JDK 1.2 and later, skeletons are no longer needed. A n he server stub s receive marshal method calls the name and arguments T
from the client stubs, performs the necessary operations, and returns the result back to the client stub. The underlying protocol for the Java-only implementation of RMI is Java Remote Method Protocol (JRMP). RMI is not the only Java technology available for remote procedure calls. Java Remote Method Invocation over Internet Inter-Orb Protocol (RMI-IIOP) is used for Java to non-Java distributed computing solutions. Java-IDL is used by Common Object Request Broker Architecture (CORBA) developers to provide a CORBA to Java distributed computing solutions. You should not see RMI-IIOP or Java-IDL on the exam.
Working with the Java Remote Method Invocation API
The term marshal is the technique of passing method parameters and results for a remote procedure call. Demarshal is the reverse technique.The action form of these terms is marshalling and demarshalling. A few benefits of RMI technologies include the heavy usage with Enterprise Java Beans; RMI is lightweight, allowing for servers to be initialized with minimum effort; and RMI hides the fine details of network communication and object serialization. Serialization is the process of flattening and restoring objects, thereby allowing the application to save the object s state as a series of bytes. This flattened object can therefore be saved to disk and/or sent across a network, where it is then reconstituted on the other side, as in the case of RMI.
RMI s competing technology is simple sockets. Sockets are not on the exam per se that is, you may see socket-related information referenced in answer choices.
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