1 / 27

Client Server Technologies Middleware Technologies

Client Server Technologies Middleware Technologies. Ganesh Panchanathan Alex Verstak. Overview. Ganesh Client/Server technologies Middleware Alex DirectExchange Sequoia 2000 3-Tier Architecture on the Grid. Computing models. Terminal host model File sharing model Client/Server model

rigg
Download Presentation

Client Server Technologies Middleware Technologies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Client Server TechnologiesMiddleware Technologies Ganesh Panchanathan Alex Verstak

  2. Overview • Ganesh • Client/Server technologies • Middleware • Alex • DirectExchange • Sequoia 2000 • 3-Tier Architecture on the Grid

  3. Computing models • Terminal host model • File sharing model • Client/Server model • Peer to Peer model

  4. Client/Server model Client/server model is a concept for describing communications between computing processes that are classified as service consumers (clients) and service providers (servers). • 2 Tier • 3 Tier • N Tier

  5. Two Tier C/S Architecture • Layers • Clients • Servers • Functionalities • User Interface – Client • Business Logic – Client (Server??) • Database management – Server

  6. 3 Tier C/S Architecture • Presentation Tier • Business Tier • Database Tier

  7. 2 Tier vs. 3 Tier • Modularity • Change management • Reuse • Performance • Scalability • Multiple data sources • ????

  8. Example N-Tier Architecture J2EE Application Model

  9. Middleware Middleware is a class of software technologies designed to help manage the complexity and heterogeneity inherent in distributed systems.

  10. Middleware

  11. Middleware • Enable multiple processes interact across a network • Between Apps and OS/Network services • More functional API for: • Heterogeneity • Location transparency • Reliability • Scalability

  12. Types of middleware Middleware can take the following forms: • Remote procedure call • Object request broker • Transaction Processing monitor • Message oriented middleware

  13. Transaction A Transaction means a sequence of information exchange and related work (such as database updating) which is treated as an unit for the purposes of satisfying a request and ensuring database integrity.

  14. Examples of transactions • Purchase online using credit card • Withdraw money from ATM • Electronic funds transfer • Book an airline ticket • Ordering in Inventory management • Billing for phone calls

  15. Transactional Integrity - ACID • Atomicity • Trans. must be done or undone completely • Consistency • One consistent state to another • Isolation • Each trans. must be independent of others • Durability • Completed transactions are permanent

  16. Transaction Processing Monitor Monitors a transaction as it passes through the different stages to • Guarantee integrity of transaction • Runtime resource management

  17. TP Monitors • Clients connect to the TP monitor • TP Monitor • Accepts transactions • Queues them • Takes responsibility till they are finished • Two types • TP Heavy • TP Lite

  18. Features • Maps requests to controlled set of processing routines for performance • Ability to update multiple DBMSs in a single transaction • Connectivity to flat files, non relational DB and legacy data • Prioritize transactions

  19. Vendor Implementations • Tuxedo by BEA • JTS by Java • MTS by Microsoft • CICS by IBM

  20. Message Oriented Middleware Messaging is an asynchronous method of passing information between processes • across network • across platform and OS

  21. Message Oriented middleware • Message – Self contained object • Message header – address, id, priority • Body of the message • Message is intelligent when compared to a transaction in TP systems. • In TP systems • Transactions are just packets • Intelligence to handle them is in monitor

  22. Message Oriented Middleware

  23. Features of MOM • Primarily asynchronous communication • Point to multi-point • Ordered delivery • Receipt notification • Handling duplicates • Message queues – FIFO or priority basis • Messages – persistent or non-persistent

  24. Point to point messaging • Client may be only sender, only receiver or both • Single receiver • Use of a message queue

  25. Publish – Subscribe messaging • Free sender from knowing the receivers • Messages are categorized on topics • List of senders/receivers is dynamic

  26. Vendor Offerings • MQSeries by IBM • JMS by Java • MSMQ by Microsoft • DECMessageQ by BEA

  27. References • Client/Server • http://edocs.bea.com/tuxedo/tux80/atmi/intbas3.htm • http://www.sei.cmu.edu/str/descriptions/clientserver.html • http://www.sei.cmu.edu/str/descriptions/threetier.html • Middleware • http://www.sei.cmu.edu/str/descriptions/middleware.htm • http://www.eecs.wsu.edu/~bakken/middleware.pdf • http://www.execpc.com/~gopalan/mts/msmq.html • http://proj-cmw.web.cern.ch/proj-cmw/workshop/mom.pdf

More Related