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Using ILU With Java


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Tutorial2Server.java



A D V E R T I S E M E N T

/*
 * Run this like
 * java Tutorial2.Tutorial2Server servername
 */ 
 
package Tutorial2;

import xerox.ilu.Ilu;
import xerox.ilu.IluSystemException;
import xerox.ilu.IluServer;


class Factory2Impl implements Tutorial2.Factory {
    
    public Factory2Impl() {
    }
    
    public Tutorial.Calculator CreateCalculator() 
                        throws xerox.ilu.IluSystemException {
        System.out.println("Factory2Impl: request for a simple calculator");
        return new Tutorial2.TapeCalculatorImpl();
    } //CreateCalculator
    
    public Tutorial2.TapeCalculator CreateTapeCalculator() 
                throws xerox.ilu.IluSystemException {
        System.out.println("Factory2Impl: request for a tape calculator");
        return new Tutorial2.TapeCalculatorImpl();
    } //CreateTapeCalculator
    
} //Factory2Impl


public class Tutorial2Server {
    static Factory2Impl factory;
    static xerox.ilu.IluServer trueServer;
    
    public static void main(String argv[]) {
        String serverId;
        if (argv.length != 1) {
            System.err.println("usage: java Tutorial2.Tutorial2Server servername");
            System.exit(1);
        }
        System.out.println("Create the server");
        try {
            //Create a server with appropriate server id (which is
            //taken from the first argument) 
            serverId = argv[0];
            trueServer = xerox.ilu.IluServer.createServer(serverId);
        } catch (xerox.ilu.IluSystemException e) {
            System.err.println("Failed creating server: " + e);
            System.exit(1);
        }
        System.out.println("Create the factory");
        try {
            //Now create an instance of a Factory object on the server
            //with an instance handle "theFactory"
            factory = new Factory2Impl();
            Tutorial2.FactoryStub.registerTrueObject( 
                "theFactory", 
                factory, 
                trueServer
                );
            //Make the factory well known by publishing it
            xerox.ilu.IluSimpleBinding.publish(factory);
        } catch (xerox.ilu.IluSystemException e) {
            System.err.println("Failed creating Factory: " + e);
            System.exit(1);
        }
        //Now we print the string binding handle (the object's name
        //plus its location) of the new Factory instance
        System.out.println("Factory instance published");
        System.out.println("Its SBH is '" + Ilu.sbhOfObject(factory) + "'");
        //the program doesn't terminate because the server is still alive...
    } //main 
    
} //Tutorial2Server

 



simple4.java


 
/*
 * A simple client program that finds the TapeCalculator-Factory,
 * creates a calculator and executes the users input.
 */ 

/*
 * Run this like
 * java Tutorial2.simple4 serverId
 */ 

package Tutorial2;

public class simple4 {
    
    /* We define a new routine, "Get_Tutorial_Calculator", which 
     * finds the tutorial factory, then creates a new TapeCalculator
     * object for us.
     */
    public static Tutorial2.TapeCalculator 
    GetTutorialTapeCalculator(String serverId, String factoryId) {
        Tutorial2.Factory factory = null;
        Tutorial2.TapeCalculator calc = null;
        System.out.println("Looking up factory");
        try {
            /* We have to call lookup with the object ID of
             * the factory object, and the "type" of the object we're looking
             * for.
             */
            factory = (Tutorial2.Factory) 
                            xerox.ilu.IluSimpleBinding.lookup(
                    serverId, 
                    factoryId, 
                    Tutorial2.FactoryStub.iluClass()
                    );
        } catch (xerox.ilu.IluSystemException e) {
            System.err.println("Failed to get factory: " + e);
            System.exit(1);
        }
        if (factory==null) {
            System.err.println("Got null factory");
            System.exit(1);
        } 
        System.out.println("Got factory " + factory);
        System.out.println("Looking up TapeCalculator");
        try {
            calc = factory.CreateTapeCalculator();
        } catch (xerox.ilu.IluSystemException e) {
            System.err.println("Failed to get TapeCalculator: " + e);
            System.exit(1);
        }
        if (calc==null) {
            System.err.println("Got null TapeCalculator");
            System.exit(1);
        }
        System.out.println("Got TapeCalculator " + calc);
        return calc;
    } //GetTutorialTapeCalculator
     
     
    static String opNames[]
        = {"SetValue", "Add", "Subtract", "Multiply", "Divide"};
    
    static double argToDouble(String inputLine) {
        return Double.valueOf(inputLine.substring(1)).doubleValue();
    } //argToDouble


    public static void main(String argv[]) {
        Tutorial2.TapeCalculator calc;
        Tutorial2.Operation[] tape;
        boolean quitFlag = false;
        double value = 0.0;
        String line;
        java.io.DataInputStream sysIn = 
            new java.io.DataInputStream(System.in);

        if (argv.length < 1) {
            System.err.println("USAGE: java Tutorial2.simple4 serverid");
            System.exit(1);
        }
        //Find a calculator
        String serverId = argv[0];
        calc = GetTutorialTapeCalculator(serverId, "theFactory");
        if (calc==null) {
            System.err.println("Didn't get a calculator");
            System.exit(1);
        }
        System.out.println("Got tape calculator");
        try {
            //Clear the calculator before using it
            calc.SetValue(0.0);
            //Loop over user inputs and perform the requested operation
            while (!quitFlag) {
                value = calc.GetValue();
                System.out.print(value + "\n> "); System.out.flush();
                line = sysIn.readLine();
                if (line == null) line = "q";   
                switch (line.charAt(0)) {
                    case '\n':
                        break;
                    case '+':
                        value = argToDouble(line);
                        calc.Add(value);
                        break;
                    case '-':
                        value = argToDouble(line);
                        calc.Subtract(value);
                        break;
                    case '*':
                        value = argToDouble(line);
                        calc.Multiply(value);
                        break;
                    case '/':
                        try {
                            value = argToDouble(line);
                            calc.Divide(value);
                        } catch (Tutorial.DivideByZero e) {
                            System.out.println("** division by zero " + e);
                        }
                        break;
                    case 'q':
                        quitFlag = true;
                        break;
                    case 't':
                        tape = calc.GetTape();
                        for (int i = 0; i <  tape.length; i++) {
                           System.out.println("  " 
                                   + opNames[tape[i].op.value()]
                                   + "(" + tape[i].value + ") => "
                                   + tape[i].accumulator
                                   );
                        }
                        break;
                    case 'c':
                        calc.SetValue(0.0);
                        break;
                    default:
                        System.out.println("Invalid Operation <" + line + ">");
                        System.out.println("Valid ops are +, -, *, /, "
                            + "t (for tape),"
                            + "c (for clear),"
                            + "q (for quit),"
                            );
                }
            }
        } catch (java.io.IOException e) {
            System.err.println("Example raised IOException: " + e);
        } catch (xerox.ilu.IluSystemException e) {
            System.err.println("Example raised IluSystemException: " + e);
        }
    } //main
    
} //simple4

 



Tutorial.idl


module Tutorial {

  exception DivideByZero {};

  interface Calculator {
 
    // Set the value of the calculator to `v'
    void SetValue (in double v);
    // Return the value of the calculator
    double GetValue ();
    // Adds `v' to the calculator's value
    void Add (in double v);
    // Subtracts `v' from the calculator's value
    void Subtract (in double v);
    // Multiplies the calculator's value by `v'
    void Multiply (in double v);
    // Divides the calculator's value by `v'
    void Divide (in double v) raises (DivideByZero);
  };

  interface Factory {

    // Create and return an instance of a Calculator object
    Calculator CreateCalculator();
  };
};

 



Tutorial2.idl


#include "Tutorial.idl"

module Tutorial2 {

  enum OpType { SetValue, Add, Subtract, Multiply, Divide };

  struct Operation {
    OpType op;
    double value;
    double accumulator;
  };

  typedef sequence<Operation> RegisterTape;

  // A four function calculator with a register tape
  interface TapeCalculator : Tutorial::Calculator {

    RegisterTape GetTape ();
  };

  // A factory that produces TapeCalculators
  interface Factory : Tutorial::Factory {

    TapeCalculator CreateTapeCalculator ();
  };
};

 



Index of Concepts




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Keywords: Using ILU with Java, ILU, ILU, ILU tutorial, ILU tutorial pdf, history of ILU, Custamizing Style Sheet, learn ILU

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