Last update:
Apr 1, 2000
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CLEO's User Centric Data Access System
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Chirstopher Jones,
Martin Lohner
Cornell University
Presented by:
Christopher Jones
When analyzing data, physicists want to spend their time studying the
data instead of learning about, writing and debugging code for the
data access system. We have tried to create a data access system that
minimizes both the learning curve and code writing time.
The system is built on a simple data model we call the Frame. The Frame
holds all the information necessary to describe the detector at an
instance in time. All data is treated equally so a user can study
changes in the accelerator's beam current the same way they would look
for a decay in the collision events. In addition any piece of data can
be retrieved from the Frame in a type safe manner by calling the
'extract' function. This design means once a user learns how to access one
type of data, they can access any data.
The program Suez is used to provide a Frame to the user's analysis code.
Suez is a lightweight program which can dynamically load modules that
can be used to read/write data, create new data, or analyze data. The
flexibility and efficiency of the Suez system allows us to use one
program for all of our data access needs: software trigger, online
monitoring, calibration, reconstruction, monte carlo generation,
analysis and event display.
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