Caching the MDSPlus Data via Hibernate

1
Caching the MDSPlus Data via Hibernate
(Development of WebScope)

• By
• Ajith M Jose
• Comp6703 Project
• Client Raju Karia Supervisor Dr.Henry
  Gardner

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Outline

• Introduction
• What is Hibernate ?
• What is MDSPlus ?
• Working of WebScope
• Demonstration
• Software Requirements
• Client Requirements
• Major Issues Faced
• Project Planning
• Conclusion
• Questions

3
Introduction

• my project
• retrieve datasets from MDSPlus server using a web
  GUI
• cache data using Java object/relational mapping
  solution Hibernate
• based on the work done by Shi Hu

4
Hibernate

• powerful, ultra-high performance
  object/relational persistence and query service
  for Java
• uses HDLCA (Hibernate Dual-Layer Cache
  Architecture)
• two levels of cache
• Session level- serves one client or session at
  one time
• JVM level- works on a global basis (for different
  sessions using same instance of JVM)
• Can use Hibernate query language (HQL) or native
  SQL

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MDSPlus

• -millions of datasets are generated during fusion
  experiments
• -data storage and management system
• -developed for fusion researchers
• -researchers from different parts of the world
  connect to the MDSPlus using client side
  applications like EScope and JScope
• -they connect to the MDSPlus server and retrieve
  the required datasets

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Current way of retrieving data from MDSPlus

• Issues with the current way of retrieving data
  from MDSPlus
• no caching of data
• researchers need to wait for the same amount of
  time even when accessing the previously accessed
  datasets
• longer period to retrieve data
• researchers need to install EScope software into
  their machine

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Solution to the issues with retrieving data from
MDSPlus

WebScope -uses java object/relational mapping
solution Hibernate to cache datasets from the
MDSPlus so that the researchers can get the
datasets quickly -works from a web server and
retrieve the MDSPlus datasets ,so that the
researchers need not install any specific
software to run it.
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Development of WebScope

• WebScope (EScope over web)

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Software Requirements

• Jakarta Tom Cat 5.0
• Hibernate3.0
• JDK1.5
• HSQLDB
• Java Applet enabled Web Browser

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Client Requirements

• Use the Hibernate package to make the data
  access from the MDSPlus server faster
• Allow researchers to retrieve and view the
  required dataset from the MDSPlus server using a
  web browser
• Obtain information about researchers who use the
  data from the MDSPlus.
• Track the actions of the Researchers
• Allow researchers to contribute meta data based
  on the retrieved dataset
• Allow them to view all the user contributed
  metadata
• Software should work on all the platforms

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Demonstration
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Major Issues Faced

• Linux specific issues
• - due to specific nature of project, used the
  Linux machine provided by department.
• - my Linux skills were very basic
• - had real nightmare in configuring required
  software packages
• - thanks to Raju, Henry and Hugh
• Learning Curve
• - Hibernate
• - Tom Cat
• - Java Servlets

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Project Scheduling

• Weekly meeting with my client and supervisor
• Had to change the initial time table since I took
  extra 2 weeks for the software installation and
  configuration.
• Scheduled the work for every week based on the
  client/supervisors feedback
• Maintained a work book

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Planned Mile Stones
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Achieved Mile Stones
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Hibernate-Implementation

• Uses persistent classes that are mapped to
  database tables Example Message.java
• Fields id and text will be converted to
  corresponding database table fields

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Hibernate Mapping file
MESSAGES TABLE
MESSAGE_ID MESSAGE_TEXT

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Java Code

• To store value to the table MESSAGES

After the Storage of DataMESSAGES TABLE
MESSAGE_ID MESSAGE_TEXT
1 Ajith M Jose
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Future Work

• Implementation of a metadata index based search
  mechanism
• Implementation of a more powerful database
  (MySql)
• Implementation of an administration side which
  gives special privileges to the administrator
• Implementation of an engine which allows the
  users to create metadata tables dynamically.
• Implementation of a new mechanism to plot the
  graphs (removing applets).

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Conclusion

• Hibernate package is a very powerful tool to
  perform caching operations.
• It makes the life of programmers easier and the
  life of users faster.
• Through the successful implementation of the
  WebScope, it is now possible for the
  researchers to quickly access the MDSPlus
  datasets through a web browser.

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Questions ?