Building, Configuring, and Running an Open Source Web Services Enabled Server

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Building, Configuring, and Running an Open Source
Web Services Enabled Server

• Technology Series 3
• A Linux Server will be utilized for the creation
  of an Enterprise Content Management System for a
  generic organization

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What is an Enterprise Content Management System
(ECMS)?

• It is any of the strategies and technologies
  employed in the information technology industry
  for managing the capture, storage, security,
  revision control, retrieval, distribution,
  preservation and destruction of documents and
  content. ECM especially concerns content imported
  into or generated from within an organization in
  the course of its operation, and includes the
  control of access to this content from outside of
  the organization's processes.

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ECMS Software in the Library

• Open Source ECMS software is available for almost
  any aspect of Library Operations
• The Software which we have chosen to use at
  LILRC is TIKIWIKI
• Tikiwiki is a full featured free software
  Wiki/CMS/Groupware written in PHP.

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The TIKIWIKI Community Portal

• http//tikiwiki.org/
• Support and other related services are freely
  available. Venues are also available for
  vender-based services for those who do not have
  in house capabilities for whatever reason.

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ECMSs and Web Services

• Web Services provide the glue which holds
  together the ECMS and facilitates the Collection,
  Compilation, Storage and utilization of
  Information throughout the ECMS.

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What are Web Services?

• They are Application Components
• Communicate using Open Protocols
• Are Self-Contained and Self-Describing
• Can be Discovered using UDDI (Universal
  Description, Discovery and Integration)
• Can be Used by Other Applications
• Have XML (eXtensible Markup Language) as their
  Basis

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How do Web Services Work?

• The Basic Web-Services Platform is XML HTML
• HTTP (Hyper Text Markup Language) is the most
  commonly used Internet Protocol
• http//www.w3.org/MarkUp/
• XML provides a Common Language which can be used
  between different Platforms and Programming
  Languages while still being able to express
  Complex messages and functions.
• http//www.w3.org/XML/

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Web Services Elements?

• SOAP (Simple Object Access Protocol)http//www.w3
  .org/TR/soap12-part0/
• UDDI (Universal Description, Discovery and
  Integration)http//www.uddi.org/
• WSDL (Web Services Description Language)
  http//www.w3.org/TR/wsdl

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WEB Services

• The Web Services Platform is a simple,
  interoperable, messaging framework
• Its purpose is make it easier for applications to
  seamlessly communicate over a network
• Using Web services an application can publish its
  function or message to the rest of the world
• Web services uses XML to code and decode your
  data and SOAP to transport it using open
  protocols

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Web Services Have Two Types of Uses

• Reusable Application Components
• Web services can offer application components
  such as currency conversion, weather reports, and
  language translation as services
• Ideally, there would be only one type of each
  application component, and anyone could use it in
  their application

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Web Services Have Two Types of Uses (cont.)

• To connect existing software
• Web services help solve the interoperability
  problem by giving different applications a way to
  link their data
• Using Web services you can exchange data between
  different applications and different platforms

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Web Services Facilitate Interoperability

• When all major platforms could access the Web
  using Web browsers, different platforms could
  interact. For these platforms to work together,
  Web applications were developed
• Web applications are simple applications run on
  the web. These are built around Web browser
  standards and can mostly be used by any browser
  on any platform

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Web Application Publication

• Using Web services your application can publish
  its function or message to the rest of the world
  
• Web services uses XML to code and decode your
  data and SOAP to transport it using open
  protocols
• With Web Services media acquisition can be
  automated directly through the suppliers
  Published Services

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What is SOAP?

• Simple Object Access Protocol
• Is a Communications Protocol
• Is for Communication Between Applications
• Is a Format for Sending Messages
• Is Designed to Communicate through the Internet
• Is Platform Independent
• Is based on XML
• Is Simple and Extensible
• Allows Messages to get around Firewalls
• Is being Developed as a W3C Standard
  http//www.w3.org/

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What is WSDL

• Web Services Description Language
• Is written in XML
• Is Used to Describe Web Services
• Is an XML Document
• Is used to Locate Web Services
• Will soon be a W3C Standard

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What is UDDI

• Universal Description, Discovery and Integration
• Is a Directory for Storing Information about Web
  Services
• Is a Directory of Web Services Interfaces
  Described by WSDL
• UDDI Communicates via SOAP
• Is built into the Microsoft .NET Platform

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Web Services

• Any application can have a Web Service component
• Web Services can be created regardless of
  programming language
• Web Services are Cross Platform or Universal
  application

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ASP .NET Web Service Example

• lt_at_ WebService Language"VB" Class"TempConvert"
  gt Imports System
• Imports System.Web.Services
• Public Class TempConvert Inherits WebService
  ltWebMethod()gt Public Function FahrenheitToCelsius
  (ByVal Fahrenheit As Int16) As Int16
• Dim celsius As Int16
• celsius ((((Fahrenheit) - 32) / 9) 5)
• Return celsius
• End Function
• ltWebMethod()gt Public Function CelsiusToFahrenheit
  (ByVal Celsius As Int16) As Int16
• Dim fahrenheit As Int16
• fahrenheit ((((Celsius) 9) / 5) 32)
• Return fahrenheit
• End Function
• End Class
• This document is a .asmx file. This is the
  ASP.NET file extension for XML Web Services
• Save as an .asmx file and publish on server with
  .NET support

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PHP Web Service Example

• require_once 'SOAP/Client.php'
• wsdl_url 'http//soap.amazon.com/schemas3/Amazo
  nWebServices.wsdl'
• WSDL new SOAP_WSDL(wsdl_url)
• client WSDL-gtgetProxy()
• params array(
• 'manufacturer' gt "O'Reilly",
• 'mode' gt 'books',
• 'sort' gt 'title',
• 'page' gt 1,
• 'type' gt 'lite',
• 'tag' gt 'trachtenberg-20',
• 'devtag' gt 'XXXXXXXXXXXXXX', ) books
  client-gtManufacturerSearchRequest(params)
• Finds all of Oreillys books sorted from best to
  worst selling

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Web Services Summary

• With Web Services we can convert Applications
  into Web-based Applications
• Web Services uses XML to allow Communication
  between Web-based Applications
• Web Services allows us to Export a Function
  (Create a Web Service) from our Applications
• http//lilrc.org/CSC692/WebServices/WebServices.ht
  m Web Services Graphical Representation

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Steps for the Creation of a Web Services Enabled
Server

• Build the Server (hardware)
• Install and Configure the Operating System
  (Software)
• Install the Applications and Web Services
  (Software)

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Build the Server (Hardware)

• The Server can be constructed from readily
  available components
• http//lilrc.org/CSC692/CSC_692.htm
  General overview of
  Client/Server Theory
• http//lilrc.org/CSC692/Computer/Build1.htm
  Building the Computer

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Install and Configure the Operating System (OS)
(Software)

• CENTOS (Community ENTerprise Operating System)
  was chose for the OShttp//www.centos.org/
• Centos can be clustered using various
  Applicationshttp//www.rocksclusters.org/wordpres
  s/
• Installing CENTOS with the Everything option
  automatically configures the Server to run as a
  LAMP (Linux, Apache, MYSQL,PERL)
  Serverhttp//www.lamphowto.com/

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Install and Configure the Operating System (OS)
(Software)

• Install Webmin, this will enable easy
  configuration of the various applications and
  services running on the CENTOS Serverhttp//www.w
  ebmin.com/
• Webmin is simple to install and is a good way to
  easily learn Linu/Unix Systems. It also allows
  web based updating and simple addition of modules
  through CPAN and the Webmin websitehttp//lilrc.o
  rg/CSC692/CSC_692.htm
• For an example of Webmin on a running system.
  This is the Contendm Server for LI Memories
  Digital Projecthttp//209.139.1.18210000/

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Install and Configure the Operating System (OS)
(Software)

• Typical LAMP Server will be set up
• Linux used will be CENTOS
• Apache is the Web Server http//www.apache.org/
• MYSQL is the Database Server http//www.mysql.com/
  
• PERL Server which runs the interpreter for PERL
  scripts which may be run directly or embedded in
  the HTML or PHP server pages http//www.perl.org/
  

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Install and Configure the Operating System (OS)
(Software)

• Additional Scripting Languages used
• Python Server which runs the interpreter for
  Python scripts which may be run directly or
  embedded in the HTML or PHP server pages
  http//www.python.org/
• RUBY Server which runs the interpreter for RUBY
  scripts which may be run directly or embedded in
  the HTML or PHP server pages http//www.ruby-lang.
  org/en/
• JAVA Server which runs the interpreter for JAVA
  scripts which may be run directly or embedded in
  the HTML or PHP server pages http//java.sun.com/
  
• PERL Server which runs the interpreter for PERL
  scripts which may be run directly or embedded in
  the HTML or PHP server pages http//www.perl.org/

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Install and Configure the Operating System (OS)
(Software)

• CLR (Common Language Runtime environment) Server
  which runs the interpreter for CLR scripts which
  may be run directly or embedded in the HTML or
  PHP server pages http//refbase.sourceforge.net/
• Each of these scripting languages has many
  scripts available on-line through web searches.
  For example, CPAN (Comprehensive PERL Archive
  Network) Maintains an increasing number of PERL
  modules with documentation which can be easily
  plugged into applications and web
  pages.http//cpan.perl.org/

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Web Services Enabled Server

• The Web Services enabled Server contains many
  other Server-based Services and applications
  which are running on the server as distinct
  processes
• Their relationship can be seen through a
  graphical depiction
  http//lilrc.org/CSC692/WebServices/ServerMap.htm
  

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