Computer Networks Webcommerce by Linnea Reppa Douglas Martindale Lev Shalevich

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Computer NetworksWebcommerce byLinnea
ReppaDouglas MartindaleLev Shalevich
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Part I
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The E-Boutique Commerce Site

• Three tier architecture using Java Server
  technologies

JSP Pages
Java Servlet
Web Client (HTML)
HTTP Request
Java Beans
HTTP Response
CGIScript
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(No Transcript)
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Java Server Technologies

• Java Servlets
• JavaServer Pages
• JavaBeans
• Need a Web server that supports the Java Servlet
  and JavaServer Pages APIs. The E-Boutique site
  uses the Apache Tomcat server
  (available at http//jakarta.apache.org).
• Run over standard HTTP

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Java Servlet Technology

• Servlets are standard, server-side Java
  application components that act as a middle layer
  between Web clients and enterprise applications
  and/or databases.
• Purpose is to accept an HTTP request, perform any
  necessary processing, which may involve invoking
  other applications and/or objects, and format an
  HTML reply.
• All processing occurs in the server.
• Analogous to Common Gateway Interface (CGI)
  programs, but provide superior scalability,
  portability, and convenience.

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Java Servlet Technology(Continue)

• With traditional CGI, the operating system
  creates a new process for every HTTP request. A
  Servlet gets loaded into the Web server's memory
  the first time it is requested, and subsequent
  requests call the servlet instance already in
  memory with threads dispatched to handle
  individual requests. Because the compiled
  servlet is stored in memory, fewer system
  resources are needed at run-time and system
  response is very fast.
• Servlets come with an infrastructure for
  automatically parsing HTML form data, reading and
  setting HTTP headers, and tracking sessions.

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Java Servlet Technology(Continue)

• The HttpServletRequest object automatically
  created by the Servlet represents a session
  object. The session object can be used to store
  any type of object, including beans, and is
  identified by a unique session key. This feature
  allows for the persistence of data throughout the
  session.
• The HttpServletRequest also contains the form
  data of the most recently submitted HTTP form.
  The servlet engine takes care of all form field
  parsing.

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Java Server Pages (JSP)

• JSP technology was developed as a method to
  separate dynamic content, specific to the
  processing of a user request, from static HTML
  page design.
• JSP pages mix HTML and JSP-specific syntax. JSP
  pages are composed of HTML written in the normal
  manner, and Java code enclosed in special tags
  for the dynamic content.
• A JSP page is in fact a servlet JSP class files
  extend the HttpJspBase class, which in turn
  implements the Servlet interface.

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Java Server Pages (JSP)(Continue)

• The advantage of this architecture is that there
  is very little processing logic within the
  presentation page itself it is simply
  responsible for retrieving the JavaBean objects
  previously created by the servlet controller,
  extracting the bean information for dynamic
  content, and inserting the content within
  standard HTML components.
• Like servlets, provide a very efficient solution
  because they're only loaded once as an operating
  system process and individual requests are
  handled via threads.

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JavaBeans

• JavaBeans provide an architecture for building
  and using Java components.
• JavaBean components are nothing but Java classes
  that follow a well-defined design/naming pattern.
  A bean encapsulates its properties by declaring
  them private and provides public access (get/set)
  methods for reading and modifying their values.
• Persistence, a key feature of JavaBeans, enables
  a bean to save its state.
• The use of JavaBeans with Servlet and JSP
  technology is especially advantageous because
  beans can act as data encapsulators to allow data
  to persist, enabling collaboration between
  servlets JSP pages.

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Part II
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Results of WebStress on E-boutique's OrderProc
Servlet (before server maintenance)
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Median Response Time Related to Simultaneous
Users (Order Processing Servlet before Server
Maintenance)
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Mean Response Time Related to Simultaneous Users
(Order Processing Servlet before Server
Maintenance
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Median Response Time Related to Simultaneous
Users (Order Processing Servlet before Server
Maintenance)-Filtered Responses
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Mean Response Time Related to Simultaneous Users
(Order Processing Servlet before Server
Maintenance)-Filtered Responses
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Error Rates for Order Processing Servlet Before
Server Maintenance
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Comparison of Median Responses vs. Filtered
Median Response (Order Processing Servlet before
Server Maintenance)
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Comparison of Mean Responses vs. Filtered Mean
Responses (Order Processing Servlet before Server
Maintenance)
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Results of WebStress on E-boutique's OrderProc
Servlet (after server maintenance)
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(No Transcript)
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Median Response Time Related to Simultaneous
Users (Order Processing Servlet after Server
Maintenance)
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Mean Response Time Related to Simultaneous Users
(Order Processing Servlet after Server
Maintenance)
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Median Response Time Related to Simultaneous
Users (Order Processing Servlet after Server
Maintenance)-Filtered Responses
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Mean Response Time Related to Simultaneous Users
(Order Processing Script after Server
Maintenance)-Filtered Errors
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Error Rates for Order Processing Servlet after
Server Maintenance
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Comparison of Median Responses vs. Filtered
Median Responses (Order Processing Servlet after
Server Maintenance)
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Comparision of Mean Responses vs. Filtered Mean
Responses (Order Processing Script after Server
Maintenance)
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Results of WebStress on E-boutique's HTML(before
server maintenance)
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(No Transcript)
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Median Response Time Related to Simultaneous
Users (E-Boutique HTML before Server Maintenance)
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Mean Response Time Related to Simultaneous Users
(E-Boutique HTML before Server Maintenance)
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Median Response Time Related to Simultaneous
Users (E-Boutique HTML before Server
Maintenance)-Filtered Responses
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Mean Response Time Related to Simultaneous Users
(E-Boutique HTML before Server
Maintenance)-Filtered Responses
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Error Rates of E-Boutique HTML before Server
Maintenance
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Comparison of Median Responses vs. Filtered
Median Responses (E-Boutique HTML before Server
Maintenance)
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Comparison of Mean Responses vs. Filtered Mean
Responses (E-Boutique HTML before Server
Maintenance)
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Results of WebStress on E-boutique's home
page(after server maintenance)
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(No Transcript)
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Median Response Time Related to Simultaneous
Users (E-Boutique HTML after Server Maintenance)
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Mean Response Time Related to Simultaneous Users
(E-Boutique HTML after Server Maintenance)
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Median Response Time Related to Simultaneous
Users (E-Boutique HTML after Server
Maintenance)-Filtered Responses
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Mean Response Time Related to Simultaneous Users
(E-Boutique HTML after Server Maintenance)-Filtere
d Responses
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Error Rates for E-Boutique HTML after Server
Maintenance
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Comparison of Median Responses vs. Filtered
Median Responses (E-Boutique HTML after Server
Maintenance)
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Comparison of Mean Responses vs. Filtered Median
Responses (E-Boutique HTML after Server
Maintenance)
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Results of WebStress on E-boutique's Streaming
Media (RealServer)
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(No Transcript)
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Median Response Time Related to Simultaneous
Users (RealServer Streaming Media)
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Mean Response Time Related to Simultaneous Users
(RealServer Streaming Media)
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Mean Response Time vs. Median Response Time -
RealServer Streaming Media
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Various Graphs
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Comparison of Median of All Results With Server
Maintenance (Order Processing Servlet)
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Comparison of all Mean Responses Regarding
Server Maintenance (Order Processing Servlet)
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Comparison of Median Results With Server
Maintenance (Order Processing Servlet) - Filtered
Responses
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Comparison of Mean Results With Server
Maintenance (Order Processing Servlet) -
Filtered Responses
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Comparison of Median of All Results With Server
Maintenance (E-Boutique HTML)
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Comparison of Mean of All Results With Server
Maintenance (E-Boutique HTML)
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Comparison of Median Results With Server
Maintenance (E-Boutique HTML) - Filtered
Responses
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Comparison of Mean Results With Server
Maintenance (E-Boutique HTML) - Filtered
Responses
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Comparison of Error Rates for the Order
Processing Servlet Regarding Server Maintenance
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Comparison of Error Rates for E-Boutique HTML
Regarding Server Maintenance
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Comparison of Best Error Rates in Each Test
(Servlet, HTML, Streaming Media)
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Comparison of Best Median Response Times in Each
Test
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Comparison of Best Mean Response Times in Each
Test
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Comparison of Best Median Response Times in Each
Test (Filtered Responses)
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Comparison of Best Mean Response Times in Each
Test (Filtered Responses)