First principles remote method invocation in Java

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15 First principles remote method invocation
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Remote method invocation is the invocation of a method in a remote object A remote object is an object whose remote methods can be invoked via a remote interface from another Java virtual machine[1] A remote object has all the usual properties of a Java object: it has state and methods; it can refer to other objects It even has implementations of Objectclone, Objectequals, ObjecthashCode, and ObjecttoString, with behaviour that is
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RMI specification, 22
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A remote method is a method defined in a remote interface; it is invoked via that interface A remote interface is a Java interface which extends javarmiRemote Its methods must all throw RemoteException Because Java interfaces cannot specify static methods, it follows that a remote method cannot be static Any object, even a local one, can be thought of as a server; its users are its clients A local object is essentially a local server; a remote object is a remote server Remote methods in a remote object can be invoked via RMI even if the object is in fact in the same JVM Obviously in this case they could also be invoked directly, ie via local method invocation To be accessible via RMI, a remote object must:
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implement a remote interface be exported to the RMI system
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An object is exported to the RMI system implicitly on construction, or explicitly by an exportObject method (to be discussed in a later chapter) 151 Remote stubs A remote object is accessed via a remote stub A remote stub is an object which implements the same remote interface(s) as the remote object it refers to Its class is generated from the corresponding remote object by the RMI system at compile time A remote stub can only be obtained as the result of another remote method invocation[2] The client uses the remote stub as an instance of the remote interface implemented by the remote object The remote stub is not itself the remote object; nor is it an instance of the remote class A remote stub is really a proxy for the remote object
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Normally Obviously this statement implies an infinite regress Where do we get the initial remote stub It is specially constructed for the RMI registry, which is a bootstrapping mechanism provided in order to break out of the regress See the separate chapter on the registry It is also possible to acquire remote stubs via serialized MarshalledObjects For the record, a remote stub also has all the usual properties of a Java object: state, methods, and external references, although only the methods (not the state or external references) are of interest to the RMI client It also has reasonable implementations of Objectclone, Objectequals, ObjecthashCode, and ObjecttoString
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152 Remote exceptions A remote exception is any object of the class javarmiRemoteException, or of any class derived from it
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Consider a simple echo service as shown in Example 12
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Example 12 Simple echo service and client class EchoServer { public Object }
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echo(Object object) { return object;}
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class EchoClient { public static void main(String[] args) throws Exception { EchoServer echo = new EchoServer(); Systemoutprintln(echoecho("O che bon eccho")); } }
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We can improve on this, by decoupling the server from the client specifying an intermediate interface and by using a ServerFactory for creating server objects Such a version might look like Example 13
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Example 13 Decoupled echo service with factory public interface Echo { Object echo(Object object); } class EchoServer implements Echo { public Object echo(Object object) } class EchoFactory { public static Echo getEcho() }
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{ return object;}
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{ return new EchoServer();}
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class EchoClient { public static void main(String[] args) throws Exception { Echo echo = EchoFactorygetEcho(); Systemoutprintln(echoecho("o che bon eccho")); } }
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An RMI version of the echo service is only a slight modification of Example 13, as shown in Example 14
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