Tuesday, June 30, 2009

Fundamentals Of Tibco EMS

EMS, Enterprise Message Service is a JMS implementation provided by Tibco.

The JMS framework (an interface specification, not an implementation) is designed to supply a basis for MOM development. TIBCO Enterprise Message Service implements and integrates several message services, including JMS. The creator of the message is known as the producer and the receiver of the message is known as the consumer. The TIBCO EMS server acts as an intermediary for the message and sends it to the correct destination. The server also provides enterprise-class functionality such as fault-tolerance, message routing, and communication with other messaging systems, such as TIBCO Rendezvous™ and TIBCO SmartSockets.

JMS supports two messaging models:
  1. Point-to-point (queues)
  2. Publish and subscribe (topics)
Point-to-Point Delivery
Point-to-point messaging has one producer and one consumer per message. This style of messaging uses a queue to store messages until they are received. The message producer sends the message to the queue; the message consumer retrieves messages from the queue and sends acknowledgement that the message was received. More than one producer can send messages to the same queue, and more than one consumer can retrieve messages from the same queue.

Publish and Subscribe
In a publish and subscribe message system, producers address messages to a topic. In this model, the producer is known as a publisher and the consumer is known as a subscriber. Many publishers can publish to the same topic, and a message from a single publisher can be received by many subscribers. Subscribers subscribe to topics, and all messages published to the topic are received by all subscribers to the topic. This type of message protocol is also known as broadcast messaging because messages are sent over the network and received by all interested subscribers, similar to how radio or television signals are broadcast and received.


Saturday, June 27, 2009

What is SOAP and Why?

Soap is a simple XML based protocol to let applications exchange information over HTTP and also a protocol to access web service.

SOAP stands for Simple Object Access Protocol.

Its is important for application development to allow internet communication between programms.

A better way to communicate between applications is over HTTP,because HTTP is supported by all internet browsers and servers.

SOAP provides a way to communicate between applications running on different operating systems, with different technologies and programming languages.


Saturday, June 13, 2009

Subject Based Addressing

TIB/Rendezvous software uses subject-based addressing™ technology to direct messages to their destinations, so application processes can communicate without knowing the details of network addresses or connections. Subject-based addressing conventions define a uniform name space for messages and their destinations. The locations of component processes become entirely transparent.

Any application component can run on any network host without modification, recompilation or reconfiguration. You can dynamically add, remove, and modify components of a distributed system without affecting other components.Subject-based Addressing is not tied to any name service. Subject names can be registered, and browsed, in any LDAP server or other name services.
  • Accesses data rather than computers
  • Allows data to come from different sources
  • Programs are not topology / address dependent
  • Users and programmers need not know networking details
  • Implements location transparency
  • Decouples front-end from back-end


Simplifying Distributed System Development

TIB/Rendezvous eases distributed system development in these ways:
  1. Decoupling and data independence :Distributed systems can be difficult to develop, maintain, and port to other environments. One reason for this difficulty is that components running on networked hosts are often tightly coupled - components must agree on network connections, the low-level format for data transfer, and other details. TIB/Rendezvous allows looser coupling between the components of a distributed system. Loose coupling decreases costs for development, operation and maintenance, and increases system longevity. TIB/Rendezvous self-describing data messages promote data independence; producers and consumers of data can communicate even if they do not share the same internal representations for data. Communicating programs can run on different hardware architectures, even though they use different bit order, byte alignment, or numeric representations. Data independence also eases program evolution. Producers can gracefully add new content fields to their messages without invalidating legacy receivers.
  2. Location transparency:TIB/Rendezvous uses subject-based addressing™ technology to direct messages to their destinations, so program processes can communicate without knowing the details of network addresses or connections. Subject-based addressing conventions define a uniform name space for messages and their destinations.
    The locations of component processes become entirely transparent; any application component can run on any network host without modification, recompilation or reconfiguration. Application programs migrate easily among host computers.
  3. Architectural emphasis on information sources and destinations:Decoupling distributed components eliminates much of the complexity traditionally associated with distributed programming. TIB/Rendezvous lets you think about distributed system architecture in new ways. You can divide the system into modules along natural boundaries implied by the application's information content. The first step in developing a distributed system is to identify sources and destinations of information. Nextly analyzing a distributed application problem in terms of information flow very often suggests the most natural, efficient, and flexible solution.
  4. Reliable delivery of whole messages:TIB/Rendezvous provides reliable communications between programs, while hiding the burdensome details of network communication and packet transfer from the programmer. TIB/Rendezvous takes care of segmenting and recombining large messages, acknowledging packet receipt, retransmitting lost packets, and arranging packets in the correct order. Multicast messages can often be lost when some of the intended recipients experience transient network failures. TIB/Rendezvous uses proprietary reliable multicast protocols to deliver messages despite brief network glitches.


Monday, June 1, 2009

What is Integration?

  • Integration combines the technologies and processes that enable custom-built and/or packaged business applications to exchange business-level information in formats and contexts that each understand
  • Application integration is necessary whenever a new application is purchased, enhanced, or developed
  • Integration is more than middleware programming – the middleware platform is an enabler
  • Integration is complex and technical – setting it up requires cooperation between several application teams, several types of skills, lots of patience and coordination


General Features of Middleware

  • Routing
  • DBMS access
  • Queuing
  • Publish-and-subscribe
  • Load balancing
  • Security
  • Retries and other forms of error recovery
  • Transformation
  • Logging Process management or Monitoring.


What is Middleware?Need of Middleware and its Examples

Middleware is computer software that connects software components or applications. The software consists of a set of services that allows multiple processes running on one or more machines to interact across a network. Middleware sits "in the middle" between application software working on different operating systems.
Need Of Middleware
  • Middleware reduces application development and maintenance efforts by supplying a variety of useful functions not found in the basic network transport software.
  • Most Computing is now distributed.
  • More than 95 percent of all distributed applications use some type of off-the-shelf middleware.
  • Implementing a distributed application without middleware is usually impractical
Examples of middleware
  • Application servers
  • Message-oriented Middleware (MOM)
  • Object Request Brokers (ORBs)
  • Integration Brokers (e.g., message brokers)
  • Web Integration Servers
  • Integration Platforms


Adapter SDK and Its Core Features

These are components that enable application integration. They integrate applications with TIB.
Their functions include:
  • Data representation mapper
  • Establish connectivity
  • Support for common communications paradigms
  • API hiding
  • Provides infrastructure code for writing custom TIBCO Adapters
    Application Management
    Tracing and monitoring
    Metadata description facility
  • Encapsulates much of the required adapter behavior
Its Core Features
  • Application Management
  • User extensible model
  • Transport protocols
    Broadcast Request/Reply
  • Communication with Rendezvous
  • Data encapsulation classes
  • Extensible monitoring and debugging features


Benefits of Message Bus Architecture

• Plug-n-Play Addition of New Applications and Services
• Distributed Deployment
• Shared Metadata Repository
• Event-driven Communications
• Incremental, Modular Implementation


Point To Point V/S Bus Integration


New Features in TIBCO ActiveMatrix BusinessWorks 5.6

Change in Product Name:
TIBCO BusinessWorks has been rebranded as TIBCO ActiveMatrix BusinessWorks.ActiveMatrix Business Works 5.6 is backward compatible with the earlier 5.x versions of Business Works.

Platform Support:
HPUX 11i v3/11.31 on PA-RISC and IA-64/Itanium is now supported.

Service Container:
TIBCO ActiveMatrix BusinessWorks now offers a new feature, service container in this release. Once you enable a service container, you can upload multiple EAR files in the same container. All the processes running in a service container are isolated and independent of each other. So if there is a need to add new services or upgrade the existing services in future, you can:
• deploy additional EAR in the same service container without bringing down all the running services.
• upgrade an existing process already running in a service container without affecting all the other processes running in the same service container.

Partner Service Invocation:
To manage lifecycle of BW service through ActiveMatrix administrator, the BW services need to invoke and be invoked by other TIBCO ActiveMatrix components.

XPath Functions for BusinessWorks Process Information:
TIBCO ActiveMatrix BusinessWorks provides functions in the XPath Formula builder that can be used to fetch process related information for any activity. The available functions are getCurrentProcessName(processID),getCurrentActivityName(processID), and getHostName().

JDBC Palette:
The JDBC Call Procedure, Query and Update activities now support Oracle Objects, BLOB and CLOB, PLS_INTEGER, and PL/SQL table datatypes. The input schema for the JDBC Query activity and the input and output schemas for the JDBC Call Procedure activity display the components of these complex data types in a tree structure.

Security Context Propagation from TIBCO Policy Manager:
TIBCO ActiveMatrix BusinessWorks populates the security context for Service resource or SOAP Event Source activity with the security information sent by TIBCO ActiveMatrix Policy Manager. Depending on the transport, the security information is sent either as an HTTP header or a JMS Message property.


History of TIBCO: leading EAI vendor

  • Started as Teknekron Software Systems, Inc.  - Developed software, known as the TIB technology (The Information Bus), for the integration and delivery of market data.
  • Teknekron was acquired by Reuters Group PLC, the global news and information group, in 1994.
  • In January 1997, TIBCO Software Inc., was established as an entity separate from Teknekron. 


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