Issue 1352:  No portable way to obtain list of type safe repository IDs (obv-rtf)
Source:  (, )
Nature:  Revision
Severity: 
Summary: Summary: In Section 5.9.1 on p. 5-55 of orbos/98-01-18, the spec says "the sending context is responsible for listing the repository ID"s for all the base types to which it is safe to truncate the real 
 type, going up (the derivation hierarchy) to, and including if  appropriate the formal type".  Currently, there is no portable way to obtain the list of type safe repository ID"s 
 from within the marshaling engine in order to be marshaled on-the-wire properly. 
 

Resolution: 
Revised Text: 
Actions taken:
May 15, 1998: received issue
July 30, 1998: closed issue
Discussion: 

End of Annotations:=====
Return-Path: <lphan@visigenic.com>
Sender: "Lenny Phan" <lphan@visigenic.com>
Date: Thu, 14 May 1998 17:49:43 -0700
From: Lenny Phan <lphan@visigenic.com>
Organization: Visigenic Software, Inc.
To: issues@omg.org, obv-rtf@omg.org
Subject: obv-rtf issues

 Issue #1: 

In Section 5.9.1 on p. 5-55 of orbos/98-01-18, the spec says "the
sending context is responsible for listing the repository ID's for all
the base types to which it is safe to truncate the real 
type, going up (the derivation hierarchy) to, and including if
appropriate the formal type".  Currently, there is no portable way to
obtain the list of type safe repository ID's 
from within the marshaling engine in order to be marshaled on-the-wire
properly. 

Proposal: 

Since the compilers have static knowledge of the safe types and the
derivation hierarchy, the Value helpers can be augmented to include a
static table of the type safe 
repository id's from which the marshaling code can query.  For example
if I have the following idl: 

value Base { 
  string str; 
  float fl; 
}; 

value Derived : safe Base { 
  long l; 
}; 

interface Foo { 
  void send(in Base b); 
} 
 

// Generated Helper for value Derived and Base 

public class BaseHelper { 

  // standard helper methods 
    .... 

  //  Static table of type safe id's 
 private static java.lang.String[] _safe_ids = { 
    "IDL:Example/Base:1.0", 
  }; 

 // method which marshaling code invokes for obtaing list of type safe
id's 
  public java.lang.String[]  type_safe_ids() { 
    return _safe_ids; 
  } 
} 

public class DerivedHelper { 

  // standard helper methods 
    .... 

  //  Static table of type safe id's 
 private static java.lang.String[] _safe_ids = { 
    "IDL:Example/Derived:1.0", 
    "IDL:Example/Base:1.0" 
  }; 

 // method which marshaling code invokes for obtaing list of type safe
id's 
  public java.lang.String[] type_safe_ids() { 
    return _safe_ids; 
  } 
}