MyLan

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MyLan

• Explanation
• 16 March

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(No Transcript)
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Servlet

• Requires a web server to run.
• Takes the query string from the web browser.
• It converts it into a string format and sends it
  to the message bouncer.

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Message Bouncer

• Takes a string from the servlet and extracts the
  search request.
• It also takes the delta value and start value
  (start value is based on the number of times the
  next button is clicked)
• Next it creates a proprietary message and
  forwards it to the Load-balancer
• It also converts the result set from the load
  balancer to a string and sends it to the servlet

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Load Balancer

• This is the central point for all components to
  register themselves.
• Maintains a list of all Service Managers and File
  servers.
• Depending upon load distributes the search among
  different service managers.
• It also is responsible for initiating the File
  Servers to update them selves on a regular basis.
• It also collects the data from the Search Manager
  and redirects to the Message Bouncer

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Search Manager

• Each Search Manager maintains a list of search
  workers.
• It is responsible for interpreting the delta and
  start position and requesting the relevant
  information from the Search Workers.
• It also collects the response from Search Workers
  and returns the result to the Load Balancer

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Search Worker

• Search Worker is the most processor intensive
  component.
• Each search worker is given a part of the central
  repository.
• Search manager decides which part of the central
  repository is assigned to a worker.

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File Server

• Maintains a list of file workers.
• Each File worker runs on a different physical
  location (this is generally a different network)
• It has a component called net spider which
  recursively connects to different machines and
  gets the information on files available.
• This information is stored in the file server.
• When the file workers have updated the file
  server, the FS in turn informs the LB. Which in
  turns informs all SM, this connects to the FS and
  sends part of repository to the SW.

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File Worker

• File worker is needed to enumerate the machines
  in different locations.
• This like the message bouncer is a very simple
  component.