CosNaming

CosNaming

The CosNaming service is a collection of interfaces that together define the naming service.

The naming service provides the principal mechanism for clients to find objects in an ORB based world. The naming service provides an initial naming context that functions as the root context for all names. Given this context clients can navigate in the name space.

Types that are declared on the CosNaming level are:

typedef string Istring;
struct NameComponent {
      Istring id;  
      Istring kind;
};
  
typedef sequence <NameComponent> Name;
  
enum BindingType {nobject, ncontext};
  
struct Binding {
      Name    binding_name;
      BindingType binding_type;
};

typedef sequence <Binding> BindingList;
    

To get access to the record definitions for the structs use: -include_lib("orber/COSS/CosNaming.hrl")..

Names are not an ORB object but the can be structured in components as seen by the definition above. There are no requirements on names so the service can support many different conventions and standards.

There are two different interfaces supported in the service:

• NamingContext
• BindingIterator

IDL specification for CosNaming:

// Naming Service v1.0 described in CORBAservices: 
// Common Object Services Specification, chapter 3
// OMG IDL for CosNaming Module, p 3-6

#pragma prefix "omg.org"

module CosNaming
{
  typedef string Istring;
  struct NameComponent {
    Istring id;
    Istring kind;
  };
  
  typedef sequence <NameComponent> Name;
  
  enum BindingType {nobject, ncontext};
  
  struct Binding {
    Name    binding_name;
    BindingType binding_type;
  };
  
  typedef sequence <Binding> BindingList;
   

  interface BindingIterator;
  interface NamingContext;
  
  interface NamingContext {
    
    enum NotFoundReason { missing_node, not_context, not_object};
    
    exception NotFound {
      NotFoundReason why;
      Name rest_of_name;
    };
    
    exception CannotProceed {
      NamingContext cxt;
      Name rest_of_name;
    };
    
    exception InvalidName{};
    exception AlreadyBound {};
    exception NotEmpty{};
    
    void bind(in Name n, in Object obj)
      raises(NotFound, CannotProceed, InvalidName, AlreadyBound);
    void rebind(in Name n, in Object obj)
      raises(NotFound, CannotProceed, InvalidName);
    void bind_context(in Name n, in NamingContext nc)
      raises(NotFound, CannotProceed,InvalidName, AlreadyBound);
    void rebind_context(in Name n, in NamingContext nc)
      raises(NotFound, CannotProceed, InvalidName);
    Object resolve (in Name n)
      raises(NotFound, CannotProceed, InvalidName);
    void unbind(in Name n)
      raises(NotFound, CannotProceed, InvalidName);
    NamingContext new_context();
    NamingContext bind_new_context(in Name n)
      raises(NotFound, AlreadyBound, CannotProceed, InvalidName);
    void destroy( )
      raises(NotEmpty);
    void list (in unsigned long how_many,
               out BindingList bl,
               out BindingIterator bi);
  };
  
  interface BindingIterator {
    boolean next_one(out Binding b);
    boolean next_n(in unsigned long how_many,
                   out BindingList bl);
    void destroy();
  };
};

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