CORBA 编程/Echo/元对象

CORBA IDL 定义

文件: test-meta_echo.idl (查看, 纯文本, 下载页面, 浏览全部)

 #ifndef  __TEST_META_ECHO_DEFINED
 #define  __TEST_META_ECHO_DEFINED
 
 #include "test-echo.idl"
 
 //
 //  a Test Module to test the basic PolyORB functions.
 //
 module Test
    {
 
    //
    //  The Meta Class for the echo test.
    //
    interface Meta_Echo
       {
 
       //
       //  Create a new instance of the echo object
       //
       Test::Echo  //  newly created Echo object
       New_Echo ();
 
       //
       //  There is only ony instance of the meta class object which
       //  has its own Identification.
       //
       const string Name_Service_Id = "Test/Meta_Echo";
 
       };
    // end interface Meta_Echo
 
    };
 // module Test
 
 #endif

Ada 规范

文件: test-meta_echo-impl.ads (查看, 纯文本, 下载页面, 浏览全部)

 with Test.Echo;
 with PortableServer;
 
 package Test.Meta_Echo.Impl
 is
    --
    --  a Test Module to test the basic PolyORB functions
    --
 
 --------------------------------------------------------------------------------
 
    --
    --  The Meta Class for the echo test.
    --
    type Object
    is new
       PortableServer.Servant_Base
    with private;
 
    type Object_Ptr is access Object'Class;
 
 --------------------------------------------------------------------------------
 
    --
    --  Create a new instance of the echo object
    --
    function New_Echo (
       --  The Object itself
       Self : access Object)
    return
       --  newly created Echo object
       Test.Echo.Ref;
 
 private  --  -------------------------------------------------------------------
 
    --
    --  The Meta Class for the echo test.
    --
    type Object
    is new
       PortableServer.Servant_Base
    with null record;
 
 --------------------------------------------------------------------------------
 
 end Test.Meta_Echo.Impl;

Ada 实现

文件: test-meta_echo-impl.adb (查看, 纯文本, 下载页面, 浏览全部)

 with CORBA.ORB;
 with CORBA.Impl;
 
 with PortableServer.POA;
 with PortableServer.POA.Helper;
 
 with PolyORB.Log; 
 
 with Test.Echo.Impl;
 with Test.Echo.Helper;
 with Test.Meta_Echo.Skel;
 
 --
 --  The following packages are only initialized but not used otherwise.
 --
 pragma Warnings (Off, Test.Meta_Echo.Skel);
 
 --
 --  initialize packages
 --
 pragma Elaborate (Test.Meta_Echo.Skel);
 pragma Elaborate_All (Test.Echo.Impl);
 
 package body Test.Meta_Echo.Impl
 is
    --
    --  a Test Module to test the basic PolyORB functions
    --
 
 --------------------------------------------------------------------------------
 
    --
    --  Initialize logging from configuration file.
    --
    package Log is new  PolyORB.Log.Facility_Log ("test.meta_echo");
 
 --------------------------------------------------------------------------------
 
    --
    --  Log Message when Level is at least equal to the user-requested
    --  level for Facility.
    --
    procedure Put_Line (
       Message : in Standard.String;
       Level   : in PolyORB.Log.Log_Level := PolyORB.Log.Info)
    renames
       Log.Output;
 
 --------------------------------------------------------------------------------
 
    --
    --  Create a new instance of the echo object
    --
    function New_Echo (
       --  The Object itself
       Self : access Object)
    return
       --  newly created Echo object
       Test.Echo.Ref
    is
       package ORB renames CORBA.ORB;
       package POA renames PortableServer.POA;
 
       --
       --  Get Reference to the portable server
       --
       Root_POA     :  POA.Ref
                    := POA.Helper.To_Ref (
                          ORB.Resolve_Initial_References (
                             ORB.To_CORBA_String ("RootPOA")));
       --
       --  create a new Echo object
       --
       Echo_Object  :  constant CORBA.Impl.Object_Ptr
                    := new Echo.Impl.Object;
       --
       --  create a servant for the new Echo object
       --
       Echo_Servant :  constant PortableServer.Servant
                    := PortableServer.Servant (Echo_Object);
       --
       --  activate the servant. Don't know what to do with the Id.
       --
       Echo_Id      :  constant PortableServer.ObjectId
                    := POA.Activate_Object (
                          Self      => Root_POA,
                          P_Servant => Echo_Servant);
       --
       --  Convert from servant type to the correct result type.
       --
       Result       :  Echo.Ref
                    := Echo.Helper.To_Ref (
                          POA.Servant_To_Reference (
                             Self      => Root_POA,
                             P_Servant => Echo_Servant));
 
       pragma Unreferenced (Self);
       pragma Unreferenced (Echo_Id);
    begin
       Put_Line (
          "Echo = '" &
          CORBA.To_Standard_String (CORBA.Object.Object_To_String (Result)) &
          "'");
       return Result;
    end New_Echo;
 
 --------------------------------------------------------------------------------
 
 end Test.Meta_Echo.Impl;