CORBA Java. Java. Java. . Java CORBA. Java CORBA (RMI) CORBA ORB. . CORBA. CORBA Java

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1 CORBA Java?? OMG CORBA IDL C, C++, SmallTalk, Ada Java COBOL, ORB C Ada Java C++ CORBA Java CORBA Java (RMI) JDK12 Java CORBA ORB CORBA,, CORBA? CORBA,,, CORBA, CORBA CORBA Java (, ) Java CORBA Java : Java : JDK116 /JDK12 CORBA : Visibroker for JAVA 33/34 O/S : Window 95/98, NT 2 CORBA Java CORBA Java CORBA Java 1

2 CORBA Java CORBA Java CORBA C++ [ 3] CORBA Java ( 3gif) IDLtoJava C++ stub, skeleton, _< >ImplBase _tie_< > skeleton, stub C++ main(), main() 1 IDL IDL Calculator CalcuObject, CalcuObject AddEnd( ) // Calculatoridl module Calculator interface CalcuObject //EndVal long AddEnd(in long EndVal); ; ; 2 IDL stub/skeleton 2

3 prompt>idl2java Calculatoridl Calcuator 8 ORB IDL Java, C++ IDL 4 Java public [IDLtoJava ] _example_calcuobjectjava IDLtoJava Java //_example_calcuobjectjava package Calculator; public class _example_calcuobject extends Calculator_CalcuObjectImplBase /** Construct a persistently named object */ public _example_calcuobject(javalangstring name) super(name); /** Construct a transient object */ public _example_calcuobject() super(); /** <p> Operation: <b>::calculator::calcuobject::addend</b> <pre> #pragma prefix "Calculator/CalcuObject" long AddEnd( in long EndVal ); </pre> </p> */ public int AddEnd( int EndVal ) // IMPLEMENT: Operation return 0; 3 main() IDLtoJava _example_calcuobjectjava IDL CORBA 3

4 // CalcuObjectImpljava import Calculator*; class CalcuObjectImpl extends _CalcuObjectImplBase CalcuObjectImpl() super(); CalcuObjectImpl(String obj_name) super(obj_name); //EndVal public int AddEnd(int EndVal) int Sum = 0; for(int i=0; i <= EndVal;i++) Sum += i; return Sum; 4 main() main() ORB (1), (2) ORB BOA (3), (4) BOA (5) (5) GUI, (6) CORBA //Serverjava import Calculator*; import orgomgcorba*; class Server public static void main(string[] args) try //ORB // ORB orb = ORBinit(); //Visibroker 33 ORB orb = ORBinit(args, null); //Visibroker (1) //BOA // BOA boa = orbboa_init();//visibroker 33 4

5 //Visibroker 34 BOA boa = ((comvisigenicvbrokerorborb)orb)boa_init();----(2) CalcuObjectImpl impl = new CalcuObjectImpl("cal"); ----(3) boaobj_is_ready(impl); ----(4) // Wait for incoming requests Systemoutprintln(" "); boaimpl_is_ready(); ----(5) catch(systemexception e) ----(6) Systemerrprintln(" : " + e); 5 ORB (1) ORB, BOA (2) (3) (4) CORBA // Clientjava //stub import Calculator*; // CORBA import orgomgcorba*; import javaio*; public class Client public static void main(string[] args) try //ORB ORB orb = ORBinit(args,null); ----(1) //CalcuObject CalcuObject cal = CalcuObjectHelperbind(orb,"cal"); ----(2) BufferedReader stdin = new BufferedReader(new InputStreamReader(Systemin)); String tempstring; Systemoutprintln("?( :)"); while ((tempstring = stdinreadline())!= null) if (tempstringequals("")) break; int Sum = 0; int EndVal = 0; Integer Int = new Integer(0); EndVal = IntvalueOf(tempString)intValue(); Sum = caladdend(endval); ----(3) 5

6 Systemoutprintln(EndVal+" :"+Sum+"\n"); Systemoutprintln("?( :)"); Systemoutprintln(" "); catch (Exception e) ----(4) Systemerrprintln("exception: " + egetmessage()); eprintstacktrace(); ///////////////////////////////// ORBinit() /////////////////////////////////////////////////,,, static class sample int age1; // static int age2; // ; // sample s = new sample( ); sage1; // sampleage1,, init( ) ORB static ORB orb; orbinit() ORBinit() bind() /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 6

7 6 [ 4] CORBA Java ( 4gif) prompt>vbjc *java Agent prompt>osagent C prompt>start vbj Server prompt> vbj Client 7

8 [ 5] ( 5gif) 1 IDL CORBA Java Calculatoridl Serverjava, CalcuObjectImpljava 2 CORBA Java javaappletapplet, ORB CORBA AddButton_actionPerformed( ) ORB //Clientjava import javaawt*; import javaawtevent*; import javaapplet*; import Calculator*; import orgomgcorba*; public class Client extends Applet // Button AddButton = new Button(); TextField AddEndField = new TextField(); TextField SumField = new TextField(); Label label1 = new Label(); Label label2 = new Label(); FlowLayout flowlayout = new FlowLayout(); //CORBA ORB orb = null; CalcuObject cal = null; public void init() try thissetsize(new Dimension(289, 46)); AddButtonsetLabel(" "); AddButtonaddActionListener(new javaawteventactionlistener() public void actionperformed(actionevent e) AddButton_actionPerformed(e); 8

9 ); SumFieldsetEditable(false); label1settext(" "); label2settext(" "); thissetlayout(flowlayout); thisadd(addendfield, null); thisadd(label1, null); thisadd(sumfield, null); thisadd(label2, null); thisadd(addbutton, null); //ORB //orb = ORBinit(this); //Visibroker 33 orb = ORBinit(this, null);//visibroker 34 //CalcuObject cal = CalcuObjectHelperbind(orb,"cal"); catch (Exception e) Systemerrprintln(e); void AddButton_actionPerformed(ActionEvent e) String tempstring = AddEndFieldgetText(); int Sum = 0; int EndVal = 0; Integer Int = new Integer(0); EndVal = IntvalueOf(tempString)intValue(); Sum = caladdend(endval); SumFieldsetText(tempStringvalueOf(Sum)); 3 HTML HTML <applet></applet> HTML code Java <HTML> <HEAD> <CENTER><H4> </H4></CENTER> </HEAD> <BODY> <CENTER> <APPLET CODEBASE = " CODE = "Clientclass" NAME = "Applet" WIDTH = 289 HEIGHT = 50 HSPACE = 0 VSPACE = 0 9

10 ALIGN = middle > <param name=orgomgcorbaorbclass value=comvisigenicvbrokerorborb> </APPLET> </CENTER> </BODY> </HTML> 4 prompt>vbjc *java prompt>osagent C prompt>start vbj Server prompt>start gatekeeper prompt> appletviewer Calculatorhtml [ 6] ( 6gif) Calculatorhtml IP Address 10

inside: THE MAGAZINE OF USENIX & SAGE June 2001 Volume 26 Number 3 PROGRAMMING Using CORBA with Java by Prithvi Rao

inside: THE MAGAZINE OF USENIX & SAGE June 2001 Volume 26 Number 3 PROGRAMMING Using CORBA with Java by Prithvi Rao THE MAGAZINE OF USENIX & SAGE June 2001 Volume 26 Number 3 inside: PROGRAMMING Using CORBA with Java by Prithvi Rao # & The Advanced Computing Systems Association & The System Administrators Guild using