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1:Modify the remote date/time server exercise of 7 to be activatable Test the system and show the output 2:Modify this server to implement the "exit when idle" strategy 3:Modify this server to not implement the "exit when idle" strategy, but instead to be forced into existence each time rmid starts 4:Study 1015 Write a public final class called Activation which exports static methods implementing all the methods in the Activation interface that a programmer really needs in practice Exclude all constructors and methods of the classes Activatable, ActivationDesc, and ActivationGroupDesc, and all the exception classes 5:Modify the server created in the exercises above to use the class of the previous exercise rather than call the activation API directly Re test the system and show the output 6:Modify the "exit when idle" version of the activatable remote date/time server, to save its date of last inactivation by resetting its ActivationDesc, and to display this information when activated
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11 Socket factories
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Purpose Server socket factory Client socket factory Factory equality Uses of socket factories Remarks
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Socket factories were introduced in 75 This chapter looks more closely at custom socket factories and how they are implemented under Java 1 and 2 It also describes the client/server socket factory interfaces and addresses the issues of factory identity, HTTP tunnelling, and multi homing For more information about secure sockets refer to 16
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A socket factory is a class which enables you to provide your own Sockets or ServerSockets to RMI Applications using RMI can provide their own socket factories, which RMI will use when constructing server and client sockets on behalf of RMI servers and clients This facility has two principal uses: 1 To superimpose a custom protocol, eg an authenticating or encrypting protocol, over the RMI transport protocol 2 To control the Socket or ServerSocket itself: eg to set a client timeout, or to use a specific server side listening network interface in "multi homed" hosts 1121 Java 1 In Java 1 (JDK 11x), it was possible to replace the default RMI socket factory, by calling RMISocketFactorysetSocketFactory This replacement could only be performed once, and took effect for the lifetime of the JVM, affecting all objects This feature was of limited use The socket factory had to be installed during the start up of all affected servers and their clients This made it impossible to define a different socket factory per server, and placed the burden of installing factories on clients as well as servers 1122 Java 2 Java 2 (JDK 12 and following) introduces the concept of client and server socket factories When exporting an RMI server, it is now possible to supply two "socket factories" one for server sockets and one for client sockets
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With this feature, you can now control both the ServerSocket associated with an exported remote object and the Socket which a client will use to access that remote object You can vary this per server if necessary For instance, you might use some secure authenticating protocol to obtain the initial remote reference, and then "trust" everybody who has obtained such a reference using standard sockets to communicate with further remote servers If you create an embedded RMI registry, you can specify its socket factories as well The server controls the client's socket factory It does this by specifying the client socket factory when exporting itself The client socket factory is returned to the client as part of the remote stub for the remote object In other words, the client socket factory specified by the server is automatically downloaded to all clients of that server The socket factory facility is provided by the constructors and exportObject methods for the UnicastRemoteObject and Activatable classes which take RMIClientSocketFactory and RMIServerSocketFactory arguments
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