DCOM, CORBA, and RMI are middleware technologies that enable distributed processing and inter-system communication. DCOM allows components to operate across the Internet by lowering integration costs and improving flexibility. CORBA uses IDL and provides language-neutral communication through its ORB. RMI is fully integrated with Java. Web services use WSDL to describe services, SOAP for messaging, and UDDI as a registry. Socket programming uses sockets as endpoints for communication between systems over TCP and UDP. Message queues store and forward messages to allow asynchronous communication between applications.

1. Unit 1: Intersystem Communications
COP4858 PROGRAM & TECH ENHANCED 463773
Gilbert Mancilla
Hughval Williams
Define the role of Distributed Component Object Model
(DCOM), CORBA and Remote Method Invocation (RMI), in
distributed processing.
DCOM enables component applications to operate across the
Internet
Speeding development
Lowering integration costs
Improving deployment flexibility

2. Cobra
COBRA owned by Object Management Group OMG is
middleware
CORBA Interface Definition Language IDL provides the
language- and
OS-neutral inter-object commication it supports the
construction and
integration of object-oriented software components in mixed
distributed environments. object request broker
Cobra’s client to object implementation
Remote Method Invocation
RMI provides ORB functionality that is fully integrated with the
Java language and runtime environment. Unlike CORBA,
however, the RMI
ORB is fully integrated with the Java language and runtime
environment.
Cobra vs RMI
B) Describe how web services are used to integrate disparate
applications in an organization: for example, describe the role
of the WSDL Web Service Definition Language, SOAP Simple
Object Access Protocol, and UDDI Universal Description,
Discovery and Integration ,architectures in creating and using

3. web services.
WSDL ( Web Service Definition Language)
WSDL is a document written in XML. The document describes a
Web service. It specifies the location of the service and the
operations (or methods) the service exposes.
Web service as collections of network endpoints or ports
Messages are abstract descriptions of data being exchanged
Port types are abstraction collection of operations
Concrete protocol and data format specification for a particular
port type constitutes a binding
SOAP
SOAP is an XML based protocol for accessing Web Services.
SOAP stands for Simple Object Access Protocol
SOAP simply a procedural call
SOAP is a stateless protocol
SOAP Body
SOAP
SOAP
header
SOAP envelope
Header
block
Header
data

4. Header
data
Header
data
Body child element
Body child element
11
UDDI (Universal Description, Discovery and Integration)
UDDI is a platform-independent framework for describing
services.
It’s a directory service where companies are in search of web
services.
UDDI uses WSDL to describe interfaces to web services
SOAP, WSDL and UDDI together make systems flexible
Together is more of a declarative type of programming
UDDI working with WSDL AND SOAP
C) Describe the role of socket programming in communicating

5. between systems and
contrast the protocols and uses of TCP/IP sockets and Datagram
sockets.
A socket is one of the most fundamental technologies of
computer networking. Sockets allow applications to
communicate using standard mechanisms built into network
hardware and operating systems.
Three socket types are available:
Stream sockets provide a bidirectional, reliable, sequenced, and
unduplicated flow of message data.
Datagram sockets support bidirectional data flow, but don't
guarantee that the message data is sequenced, reliable, or
unduplicated.
Raw sockets give you access to the underlying communication
protocols that support socket abstractions.
Role of Socket programming
In a nutshell, a socket represents a single connection between
exactly two pieces of software.
A socket provides a bidirectional communication endpoint for
sending and receiving data with another socket. Socket
connections normally run between two different computers on a
LAN or across the Internet, but they can also be used for inter
process communication on a single computer.

6. What do you need for socket communication ?
Basically 4 parameters
Source Identifier (IP address)
Source Port
Destination Identifier
Destination Port
Software applications that rely on the Internet and other

7. computer networks continue to grow in popularity. The
following software packages rely on sockets:
Web browsers
instant messaging applications
peer to peer file sharing systems
.

8. .
Contrast the protocols and uses
of TCP/IP sockets and Datagram sockets
There are two types of Internet Protocol (IP) traffic. They
are TCP or Transmission Control Protocol and UDP or User
Datagram Protocol. TCP is connection oriented – once a
connection is established, data can be sent bidirectional. UDP is
a simpler, connectionless Internet protocol. Multiple messages
are sent as packets in chunks using UDP
Describe the purpose of message and queuing services and how
they work

9. One popular messaging services is Short messaging services
(SMS)
Short message service is a mechanism of delivery of short
messages over the mobile networks.
This messaging services has a store and forward way of
transmitting messages to and from mobiles.
The message (text only) from the sending mobile is stored in a
central short message center (SMS) which then forwards it to
the destination mobile. This means that in the case that the
recipient is not available, the short message is stored and can be
sent later. Each short message can be no longer than 160
characters.
Short Message Service:
How does SMS work?

10. A typical organization of network elements in a GSM network
supporting SMS
How does it work:
The SMC (Short Message Center) does the job of store and
forward of messages between the mobile station. On the other
hand the SME which can be found in the fixed network or a
mobile station, sends and receives short messages.
The SMS GWMS (SMS gateway MSC) is a gateway MSC that
can also receive short messages. The gateway MSC is a mobile
network’s point of contact with other networks. On receiving
the short message from the short message center, GMSC uses
the SS7 network to interrogate the current position of the
mobile station form the HLR, the home location register.
HLR : The main database in a mobile network.
Functions:

11. It holds information of the subscription profile of the mobile
and also about the routing information for the subscriber, i.e.
the area (covered by a MSC) where the mobile is currently
situated. The GMSC is thus able to pass on the message to the
correct MSC.
MSC (Mobile Switching Center) is the entity in a GSM network
which does the job of switching connections between mobile
stations or between mobile stations and the fixed network.
A VLR (Visitor Location Register) corresponds to each MSC
and contains temporary information about the mobile,
information like mobile identification and the cell (or a group
of cells) where the mobile is currently situated.
The present state of SMS
SMS has seen unprecedented growth in the last few years. In
Europe SMS has already crossed three billion messages per
month mark. The current figures and future projections in the
European market below, clearly demonstrate the popularity of

12. SMS in Europe.
Message Queuing
Purpose
Message Queuing technology enables applications running
at different times to communicate across heterogeneous
networks and systems that may be temporarily offline.
Applications send messages to queues and read messages from
queues. The following illustration on the next page shows how a
queue can hold messages that are generated by multiple sending
applications and read by multiple receiving applications.
Message Queuing provides guaranteed message delivery,
efficient routing, security, and priority-based messaging.

13. Figure above represent Message queuing service
What Is JMS?
The Java Message Service is a Java API that allows applications
to create, send, receive, and read messages.
It provides enough features to support sophisticated messaging
applications.
JMS server can communicate between client using many
protocols the following protocols:
RMI, TCP/IP, HTTP

14. E) List commonly used low level data communications

15. protocols (e.g. RS232), state conditions for when each protocol
should be used
Female "DB-9" connector (properly known as DE9F):
A VGA connector for monitors
Male "DB-9" connector (properly known as DE9M): COM1 and
COM2
female DB-25 connector (also known as DB25S):
the parallel (printer) port
male DB-25P connector (also known as DB25P): Printer cable
that connects to the
Parallel port