Web Application Servers

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Web Application Servers

• Bernt Castman
• ISK Kista
• sept 2001

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Overview

• http//www.appserver-zone.com/guide.asp
• http//www.ibm.com/webservers
• http//www.software.ibm.com/data/db2/udb/demo.html
  

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khttpd

• The Linux 2.4.0 kernel's new kernel daemon speeds
  up access to static Web pages. Take a quick look
  at that new daemon.
• Linux 2.4.x has a new kernel daemon this kernel
  daemon is a Web server. It may seem strange to
  you that Linux should have a built-in Web server,
  but think about it this way
• Most Web pages are static.
• Static Web pages are just an exercise in copying
  to the network.
• NFS does nothing more than copy files to the
  network.
• Why use a large user-space program that has to
  make a system call to copy a file to the network?
• If you read this and understood it, you can see
  that this kernel "Web server" daemon is not an
  Apache replacement. On the contrary, if you want
  to have any kind of dynamic Web content, the
  kernel Web daemon won't cut it. It can only copy
  static files to the network.

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Cont..

• The advantage is speedand lots of it. Apache is
  a large program that can handle all kinds of
  dynamic content very well. But with a static
  page, Apache will read it, process it (to make
  sure there's no dynamic content to contend with),
  and then make system calls and pass the page to
  the kernel to copy to the network.
• The kernel Web daemon grabs the static file and
  copies it to the network It's fast, clean, and
  simple. The kernel daemon is small and fast. But
  what happens if your Web site has several pages
  of dynamic content along with all the static
  pages? No problemthe kernel Web daemon (called
  khttpd) passes the request to Apache, which
  performs all the wizardry and, when the content
  is ready to copy to the network, hands it back to
  khttpd (because now it's static). Then off it
  goes.
• If you want to run khttpd, you'll first need to
  insert the module. Inserting the module creates
  certain entries in the /proc table specifically,
  it creates the directory /proc/sys/net/khttpd and
  the following files
• clientport
• documentroot
• dynamic
• logging
• maxconnect
• perm_forbid
• perm_required
• serverport
• sloppymime
• start
• stop
• threads
• unload

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Cont..

• The clientport is where khttpd will look to find
  a Web server. Any page that is not static, any
  cgi script, or any other dynamic page will be
  sent to the localhost on this port (more on this
  comes later). The default is 80. You will want to
  change this to 8080 or 8000, or wherever you want
  to relocate Apache
• The documentroot is the same as the DocumentRoot
  in your httpd.conf file. The default is /var/www.
• The dynamic file lists page extensions that
  contain dynamic Web content. These must be
  listed. By default, only cgi-bin and .. are
  contained in this list. You may want to add
  extensions such as shtml, php, php3, phps, cfm,
  inc, and asp, among others. Any pages requested
  (such as a php .inc file) will be copied to the
  network as isand this is probably not what you
  want.

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• IBM WebSphere is a new, universal Internet
  software platform that can support any kind of
  e-business from startup to megasite with the
  ability to adapt at Internet speed as your goals,
  strategies, and target markets change.

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Cont..

• All the basics are covered, from e-commerce to
  administration. Everything works. Everything
  connects. Everything scales. So if you're
  building or expanding your business on the Web,
  there's only one platform that gets it done
  period IBM WebSphere software platform for
  e-business.

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WebSphere Application Server

• IBM WebSphere Application Server is an e-business
  application deployment environment built on open
  standards-based technology. It is the cornerstone
  of WebSphere application offerings and services.
• The Standard Edition lets you use Java servlets,
  JavaServer Pages and XML to quickly transform
  static Web sites into vital sources of dynamic
  Web content.

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Cont..

• The Advanced Edition is a high-performance EJB
  server for implementing EJB components that
  incorporate business logic.
• The Enterprise Edition integrates EJB and CORBA
  components to build high-transaction, high-volume
  e-business applications.

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WebSphere Foundation Extensions

• You can grow everywhere from here.
• Because rapid change is the nature of any
  e-business, you need a software platform that can
  support any structure, of any size even when
  your companys strategy zigs when you expected it
  to zag. WebSphere Foundation Extensions provide a
  rock-solid basis for any kind of e-business
  growth whether its expected or explosive
  including Web Content Management tools to keep
  all your Internet-based information current.

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Development tools

• VisualAge Application Rules. A robust business
  rules development environment to deliver core
  business processes to the Web.
• VisualAge for Java. Proven support for building
  and testing scalable Java applets, servlets, and
  Enterprise JavaBean components.
• VisualAge Generator. High-volume transaction
  processing in multi-tier, multi-platform
  client/server environments.
• WebSphere Business Components. An easy-to-use,
  coherent package of software implementation to
  help reduce development times, run across diverse
  infrastructures, and quickly deliver
  whole-project solutions.
• WebSphere Studio. The industry's first visual
  layout tool for dynamic Web pages using JSPs,
  full HTML, JavaScript and DHTML support.
• WebSphere Homepage Builder. Simplifies the site
  development process with templates and wizards
  that go through the entire process.

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Presentation tools

• WebSphere EveryPlace Suite. A powerful software
  suite that aids developers in spanning and tying
  platforms together when writing applications.
• WebSphere Personalization. Offers users of
  WebSphere Application Server and WebSphere Studio
  the ability to build a Web site, intranet or
  extranet which delivers pages that are customized
  to the interests and needs of each site visitor.
• WebSphere Portal Server. Allows companies to
  build their own custom portal Web site that
  serves the needs of employees, business partners,
  and customers. With support for a wide range of
  syndicated content such as news feeds and weather
  channels, users have access to a variety of
  up-to-date information from a single screen.
• WebSphere Transcoding Publisher.
• WebSphere Voice Server.

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Deployment tools

• MQSeries Integrator. This "application linker"
  directs information to where it's needed, when
  it's needed and lets users access corporate
  data, wherever it is, in whatever format.
• Tivoli Policy Director. A robust and secure
  policy management tool for e-business and
  distributed applications, designed to unite core
  security technologies around common policies.
• WebSphere Site Analyzer. Offers companies a
  comprehensive WebSphere platform solution for
  enterprise web-site visitor operational,
  business, and WebSphere Commerce Suite analysis
  in one package.
• WebSphere Edge Server.
• WebSphere Host Integration.

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Application Accelerators

• WebSphere Commerce Suite
• WebSphere/Domino Integration.
• MQSeries WorkFlow.
• WebSphere BtoB Integrator.

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Illustrating Windows DNA
Visual InterDev
Browser Client

HTTP
DBMS
IIS
ASP Applications
ADO
VB, VC, VJ
DBMS
ADO
COM
DBMS
Rich Client
DCOM
Windows 2000
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America Online's own web server

• AOLserver is the backbone of the largest and
  busiest production environments in the world.
  AOLserver is a multithreaded, Tcl-enabled web
  server used for large scale, dynamic web sites.
  AOLserver powers America Online properties such
  as AOL.COM, Digital City, AOLMail, AOL Hometown,
  Helping.org, AOL Search, and much, much more!

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Open source

• Although this Oracle-based toolkit is Open Source
  and free, Oracle itself is prohibitively
  expensive for people who want to deploy
  sophisticated, low-cost Web sites. PostgreSQL is
  a widely available Open Source RDBMS that has
  greatly improved in quality in the past two
  years. In early 2000, a small group of software
  developers familiar with the ACS decided to port
  it to PostgreSQL on May 1, 2000, the developers
  released the first version of OpenACS.
• The toolkit runs under AOLserver, an extremely
  efficient, threaded, and reliable Open Source Web
  server that runs some of the busiest Web sites in
  the world. AOLserver offers an RDBMS-independent
  API with persistent, pooled database connections
  and an internal Tcl interpreter that efficiently
  executes dynamic scripts. AOLserver's ADP pages
  allow the programmer to insert snippets of Tcl
  directly into HTML pages.

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/appserv/wpbs_download.html
http//www-4.ibm.com/software/webservers
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Vad är EJB bra för?

• EJB ger mycket gratis. Man slipper skriva kod för
  bland annat
• Transaktionshantering
• Behörighetshantering
• Kontroll av användarens identitet
• Kommunikation
• Persistenshantering
• Hantering av samtidighet
• Lastbalansering och feltolerans

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Bönor forts

• En enterprise böna består av
• Remoteinterface med alla affärslogiska metoder.
• Skrivs som ett vanligt Java interface.
• Innehåller alla affärslogiska metoder som bönan
  tillhandahåller.
• När man anropar metoderna i remoteinterfacet
  anropar man metoder på en viss instans av bönan.
• Homeinterface som tillhandahåller bönans
  livscykel.
• Implementationen av bönan.
• Deployment descriptor som beskriver hur
  containern ska hantera bönan (transaktioner,
  behörighetsregler och liknande)

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IBM WebSphere Payment Manager

• bridges the security issues and provides secure,
  electronic payment processing to Internet
  merchants. Based on open, standards-based
  technology, IBM WebSphere Payment Manager works
  with payment cassettes to support multiple
  payment protocols, including

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cont..

• SET (Secure Electronic Transaction), an
  industry-standard transport and messaging
  protocol using encrypted certificates for highly
  secure payment processing
• Merchant Initiated SET (MIS), a SET
  extension that can be used by merchants to accept
  Cassette for CyberCash, which permits users of
  Payment Manager to access CyberCash, Inc.,
  CashRegister Credit Card Service
• Third-party payment cassettes written for
  the Payment Manager
• credit card information from buyers using any
  method other than SET

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cont..

• Payment Manager integrates with merchant software
  systems (for example, order fulfillment and
  online shopping) and provides cash register-like
  functionality to manage payment processing.
• The buyer never interacts with Payment Manager
  directly because Payment Manager sits behind the
  Internet merchant's storefront receiving payments
  and processing those payments with banks and
  other financial institutions.

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cont..

• Support for large hosting environments
• Users can be associated with multiple merchants
• Plug-in realm support
• Single-signon
• OfflineCard cassette
• New SampleCheckout application

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