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If an exported remote object is also serializable, it is still passed by reference In other words the recipient receives a remote reference to the original remote object, rather than a de serialized copy of it The fact that the object is exported takes precedence over the fact that it is serializable This statement applies whether or not the remote object extends UnicastRemoteObject However, if a UnicastRemoteObject is serialized, either in an unexported state or other than via RMI,[10] all its non static non transient state is serialized as usual, including the UnicastRemoteObject's own port and socket factory settings and any serializable data of the derived class[11] When the resulting stream is de serialized, the resulting UnicastRemoteObject is automatically exported to the RMI system on the same port and with the same socket factories, if any, that it had when serialized, or the defaults for these so that it may
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receive remote calls If the export fails for some reason, the de serialization will fail with an exception
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[10] [11]
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Strictly, other than via a MarshalOutputStream
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The RMI specification, 534 says that "information contained in UnicastRemoteObject is transient and is not saved if an object of that type is written to a user defined ObjectOutputStream" This specification conflicts with Sun's implementation Indeed, the "export upon de serialization" feature as implemented relies on these fields being non transient This facility allows RMI servers to be written to files and recovered from them as active entities It also allows an inactive RMI server to be passed as a parameter or returned as the result of a remote method call, whereupon the RMI server is exported at the target This provides a sophisticated form of code mobility see 9 and 123 However, no method is provided for specifying the required port and socket factories to be used when exporting the object on de serialization These parameters are taken from the serialized object, and cannot be controlled other than by actually exporting the object If the object had never been exported, or had been exported with default port or socket factory settings, the object will be exported using default port and socket factories If you need to avoid this, you must ensure that the object has been exported with these parameters set as required, and then unexported, prior to serializing it
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710 Alternative server classes
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There are other kinds of RMI server besides the "unicast remote object" The javarmiactivationActivatable class supports activatable remote objects For purposes so far in the book, it is largely equivalent to UnicastRemoteObject, with the extra feature that references to it are persistent, not transient: they can be saved and reused; and they remain valid even after the server they refer to has exited If used in this state, they cause the server to be restarted Activation is discussed in 10 The javaxrmi PortableRemoteObject class supports "portable remote objects" A portable remote object is an RMI server which communicates via the standard CORBA/IIOP protocol Portable remote objects provide most of the facilities of RMI while preserving interoperability with CORBA (Both "unicast" and "activatable" servers communicate via the RMI/JRMP protocol, which is exclusive to Java) RMI/IIOP is discussed in 14 Further speculative RMI server types are discussed in 17
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1:The ExtendedUnicastRemoteObject sample class provided in Example 72 has a "no args" constructor Can you remove it and let the Java compiler supply it Explain (You may use the Java compiler to experiment)
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2:The following remote interface defines a remote date/time service, which returns its current date and time to clients Write an RMI server class which implements this service (You can use any of the three techniques described in 73 The server must export itself)
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public interface RemoteDateTime extends javarmiRemote { javautilDate getCurrentDateTime() throws javarmiRemoteException; }
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3:Add a main procedure to the date/time server of the previous exercise The main procedure should (a) create an instance of the server, (b) register it with the RMI registry under an appropriate name, and (c) catch and display all exceptions encountered 4:Write a client for the date/time server which displays the local and remote date and time Test the entire system and show the output 5:Modify the date/time server to export itself on port 1100 Retest with the client and show the output 6:Modify the date/time server to implement the Unreferenced interface and trace all calls to the unreferenced method Retest with the client and show the output Is the unreferenced method called after the client exits How long should you wait Now, unbind the server from the registry with the regjar utility described in 6 Does the unreferenced method get called after this Explain 7:Modify the date/time server to unbind itself from the registry when the remote method has been called 10 times Retest with the client and show the output The server should exit after the client has been run 10 times, after the expiration of the interval measured in the previous exercise
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