An Overview of CORBA and Parlay/OSA APIs ZTE (USA)

2 Contents Overview of CORBA What Is CORBA What It Does Why CORBA Basic CORBA Call Model Object Orientation IDL Java for CORBA Example Overview of Parlay/OSA APIs Why CORBA for Parlay/OSA Architecture Interface Sets and Relations General Characteristics Packages IDLs APIs in Java Mapping

3 Overview of CORBA Overview of CORBA - What is It? CORBA : Common Object Request Broker Architecture A vendor-independent architecture and infrastructure that applications use to work together over networks. IIOP (Internet Inter-ORB Protocol) as the official inter-orb communication protocol A product of members of OMG (Object Management Group).

4 Overview of CORBA Overview of CORBA - What It Does Distributed Object-Oriented Computing

5 Overview of CORBA Overview of CORBA - Why CORBA CORBA is OPEN. CORBA-based software is vendor, operating system, language and network neutral. Allow Servers and Clients developed in different language running on different OS. Built-in Services ready to use, such as, Name service, Security service, Transaction service, …

6 Overview of CORBA Overview of CORBA – CORBA Version CORBA 2 interoperability and the IIOP protocol CORBA 3, current official release Component Model CORBA 4, future release To resolve CORBA over Firewall Limitation

7 Overview of CORBA Overview of CORBA – Basic Call Model 1

8 Overview of CORBA Overview of CORBA – Basic Call Model 2

9 Overview of CORBA Overview of CORBA – Object Orientation Objects, combines function and data and mimics the real world CORBA is Object-Oriented 3Keys of Object Orientation: Encapsulation Polymorphism Inheritance

10 Overview of CORBA Overview of CORBA – IDL IDL, Interface Definition Language Declarative, Object-Orientation Allow implementations in various programming languages Hello.idl module HelloApp { interface Hello { string sayHello(); oneway void shutdown(); };

11 Overview of CORBA Overview of CORBA – Java for CORBA Java IDL Compiler: idlj idlj -fallTIE Hello.idl generating those files: FileDescription Hello.java the signature interface HelloHelper.java the Helper class, narrow method to do type cast HelloHolder.java the Holder class, delegates to the methods in the Helper class for reading and writing. HelloOperations.java the operations interface HelloPOA.java the server skeleton, HelloPOATie.java the delegation model of Object _HelloStub.java the client stub, used in client side

12 Overview of CORBA Overview of CORBA – Implementing The Server

13 Overview of CORBA Overview of CORBA – Implementing The Client

14 Overview of CORBA Overview of CORBA – Implementing The Server #1 Start orbd. orbd -ORBInitialPort ORBInitialHost localhost& #2 Start the Hello server. java HelloServer -ORBInitialPort ORBInitialHost localhost& #3 Run the client application: java HelloClient -ORBInitialPort ORBInitialHost localhost #4 client will print Hello world!!

15 Overview of CORBA Overview of CORBA – Other CORBA Terminology Reference Passing, send object reference to count-party by method (rather than via name server.) Callback, invoke a method of a client object that is sent to server side via reference passing. Synchronous v.s. Asynchronous calls Basic Object Adaptor (BOA) v.s. Portable Object Adaptor (POA) Inheritance v.s. Delegation Implementation Model

16 Overview of Parlay/OSA APIs Overview of Parlay/OSA APIs – Why CORBA For Parlay/OSA APIs It is a natural choice, a good match of architecture Open Abstraction Vendor, Language neutral Distributed … None-Cobra Parlay Web Service JAIN

17 Overview of Parlay/OSA APIs Overview of Parlay/OSA APIs – Architecture Service Domain Network Domain Messaging services SMS Call Control services IN services Mobility services CAMEL UpLoc UMTS GGSN GPRS SGSN UTRAN IP PSTN MSC BS Parlay Framework: Authentication, Authorisation, …. Parlay Services: An abstraction of network capabilities. Resource Interface Resource Interface Resource Interface Resource Interface Network Interface Open Network Interface, e.g.

18 Overview of Parlay/OSA APIs Overview of Parlay/OSA APIs – Main Interface Sets and Relations Framework operator admin Enterprise operator admin tool Service supplier admin tool Telecom Network Client Application Not in scope of Parlay Phase 2 Source:

19 Overview of Parlay/OSA APIs Overview of Parlay/OSA APIs – Main Interface Sets and Relations 2 Framework Interface Set Provides 'surround' capabilities necessary for the Service Interfaces to be open, secure, flexible resilient and manageable Service Interface Set Offers applications access to a range of network capabilities Application Interface Set Application APIs for service creation and execution Enterprise Operator Set Allow third party to subscribe/contract services

20 Overview of Parlay/OSA APIs Overview of Parlay/OSA APIs – General Characteristics The Parlay/OSA APIs are abstractions of telecom/data network capabilities Are object-oriented and based on client/server architecture Name Convention between Application and Service The Service and Framework interfaces for client applications are denoted by classes with name Ip The callback interfaces to the applications are denoted by classes with name IpApp Name Convention between Application, Service and Framework The Application interfaces to Framework are typically named IpClient The Service interfaces to Framework are typically denoted by IpSvc The Framework interfaces to Services are denoted by IpFw Both synchronous and asynchronous methods are used in API Asynchronous method requests are suffixed by ‘req’ and the responses, if applicable, are suffixed by ‘Res’ and ‘Err’

21 Overview of Parlay/OSA APIs Overview of Parlay/OSA APIs – Framework APIs  Authentication Online Authentication of User Application and Network.  Authorization Access management and Control to Network Services.  Discovery Capability by which Network Service(s) identity is exposed to a User Application.  Event Notification Capability by which user application is notified of service related events.  Integrity Management Capability by which information on events which affect the integrity of the API is shared with the Framework interface and the user application.

22 Overview of Parlay/OSA APIs Overview of Parlay/OSA APIs – Service Capability APIs  Call Control Call Management by User Application. Consists of Generic CC, MultiParty CC, MultiMedia CC (SIP enabled CC), and Conference CC.  User Interaction Management of User Application interaction with Network Services, e.g. Prompt&Collect DTMF, WAP push, etc.  Generic Messaging Capability to send, store, and receive message.  Charging (New in 3.X) Capability to update or monitor a balance and generate CDRs for postpaid and prepaid subscribers.  Mobility Capability to access Mobility information, e.g. User Location, Status.  Connectivity Management Management of IP based connections, including QoS. Partially overlap with Policy Management.  Accounting (New in 3.X) Capability to get subscriber accounting information for external billing engines.  Policy Management (New in 3.X) Management of static (SLA) and dynamic (per call) policies for network service providers and for 3 rd party application service providers.  Presence & Availability Management, PAM Capability of getting presence information, subscriber availability, and also registration of presence reports.  Directory/User Profile Capability to access subscriber information. In general to access any information held in database.  Terminal Capability (New in 3.X, adopted from 3GPP OSA) Capability to access user’s terminal information in the format specified in W3C and adopted in WAP UAProf Specification.  Data Session Control (New in 3.X, adopted from 3GPP OSA) Management of data sessions in Packet Switching networks, e.g. PDP Context in GPRS.

23 Overview of Parlay/OSA APIs Overview of Parlay/OSA APIs – Parlay IDLs

24 Overview of Parlay/OSA APIs Overview of Parlay/OSA APIs – APIs In Java Mapping