About Name Directory Service
This Article is contributed by Wang Hailong.
Introduction
IT Seems That All The C / S Based Systems Have Similar Architectures and Work According To Similar Rules:
1. There Are Usually 3 Parts - Client, Server, Name Directory Service.
2. Server Registers Itself in a name directory.
3. Client Locates Server IN A Name DIRECTORY.
This Article Lists Such Scenarios from Aspects of Middle Ware and NetWork.
Middle ware
COM
A Component Registers Itself in The Registry Table, While Clients Locate It from Registry Table.
An Active Component Registers Itself with a moniker in Rot (Running Object Table), While a Client Uses The Moniker to Find The Active Component from Rot.
Corba
Clients Can ask Services from interface repository.
The Following Code Is Extracted from << Core Java 2 Volume II: Advanced Features >>.
ORB ORB = Orb.init (args, null);
String [] Services = orb.list_initial_services ();
Org.omg.Corba.Object Object = orb.resolve_initial_references ("Nameservice");
NamingContext NamingContext = NamingContextHelper.Narrow (Objcet);
EJB
JNDI.
RMIREGISTRY FOR RMI.
The Following Code Is Extracted from << Core Java 2 Volume II: Advanced Features >>.
String Url = getCodeBase (). Gethost ();
URL = "RMI: //" URL;
Centralwarehouse = (warehouse) Naming.lookup (url "/ central_warehouse);
NetWork
Socket
A Server Needs to Bind Itself to Port Number Before A Client CAN Connect IT.
Name registration and resolution
NetWork Programming Concerns Address Families, Name Registration and resolution.
The Following Table Is from << Network Programming for Microsoft Windows >>.
Name Space Description Typens_sap Service Advertising Protocol (SAP) Name Space; Used On IPX Networks Dynamic
NS_NDS NetWare Directory Services (NDS) Name Space; Also Used ON IPX Networks Persistent
NS_DNS DOMAIN Name System (DNS) Name Space; MOST Commonly Found on TCP / IP Networks and On The Internet Static
ND_NTDS Windows Nt Domain Space; Protocol-Independent Name Space Found On Windows 2000
Reference
<< Core Java 2 Volume II: Advanced Features >>
<< NetWork Programming for Microsoft Windows >>
