Introduction in Java

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72 Introduction
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In object oriented programming, any object can be considered to be a server In RMI, remote objects are remote servers An RMI server is a remote object which:
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implements a remote interface is exported to the RMI system
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RMI provides several base classes which can be used to define server classes These classes form an inheritance chain shown in Figure 71
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Figure 71 Foundation class hierarchy
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RemoteObject provides basic remote object semantics suitable for servers and stubs RemoteServer provides getClientHost and getLog methods for use by servers UnicastRemoteObject supports simple transient point to point RMI servers A unicast remote object is a server object whose characteristics are as follows:[1]
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RMI specification, 53
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references remote stubs to such objects are valid only for, at most, the life of the process
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that creates the remote object
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communication with the remote object uses a TCP transport invocations, parameters, and results use a stream protocol for communicating between client and server
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"Unicast" indicates point to point communications (as opposed to broadcasting or multicasting: these advanced topics are discussed in 17) A unicast remote object is a TCP/IP server which listens at a TCP/IP port
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73 Writing the server
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As we saw above, writing an RMI server is a matter of defining a class, exporting it when constructed, and implementing one or more remote interfaces If necessary, you can also make it obey appropriate remote object semantics, discussed in 783 There are essentially three ways to write a server using the UnicastRemoteObject class We will illustrate these, in each case implementing the remote interface of Example 71
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Example 71 Remote interface to be implemented import javarmi*; import javarmiserver*; // The remote interface to be implemented by the server interface MyRemoteInterface extends Remote { void remoteMethod() throws RemoteException; }
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731 Extend UnicastRemoteObject Remote classes can be defined by extending UnicastRemoteObject, as shown in Example 72
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Example 72 Server implementation extending UnicastRemoteObject class ExtendedUnicastServer extends UnicastRemoteObject implements MyRemoteInterface { public ExtendedUnicastServer() throws RemoteException { // auto-export happens here super(); } public void { } } remoteMethod() throws RemoteException
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Objects of such classes are automatically exported on construction as transient point to point servers When a UnicastRemoteObject is constructed, it is automatically exported registered with the RMI system and made to listen to a TCP port The various constructors for UnicastRemoteObject allow derived classes to choose between (a) exporting on a default port chosen at runtime, (b) exporting on a specified port, and (c) exporting on a specified port with specified client and server socket factories (discussed in 11) Because the automatic export step occurs on construction, all the protected constructors of UnicastRemoteObject throw RemoteException By the rules of Java, this means that if your server class extends UnicastRemoteObject, its constructors must also throw RemoteException[2] See also Exercise 1 at the end of this chapter
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and because base class constructors can't be called from within trycatch blocks A server class which extends UnicastRemoteObject inherits remote object semantics from RemoteObject, and cloning and serialization behaviour from UnicastRemoteObject UnicastRemoteObject implements the Objectclone method by cloning the entire state of the remote object and exports it as another listener on the same port[3] However, the class does not implement the Cloneable interface this is left up to derived classes Therefore, a derived class may choose for itself whether or not it is cloneable, by implementing or not implementing Cloneable UnicastRemoteObject has special behaviour under serialization, discussed in 79
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The RMI specification is unclear on this point, but in Sun's implementation this happens even if the source object wasn't exported at the time it was cloned It would be unwise to rely on this behaviour, which may be modified in a future release of Java 732 Extend RemoteServer or RemoteObject Remote classes can be defined by extending RemoteServer or RemoteObject, as shown in Example 73 and Example 74
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Example 73 Server implementation extending RemoteServer class ExtendedRemoteServer extends RemoteServer implements MyRemoteInterface { public void remoteMethod() throws RemoteException { } }
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Example 74 Server implementation extending RemoteObject class ExtendedRemoteObject extends RemoteObject implements MyRemoteInterface {
public void { }