LogDisplay.tcl - Occurrence log display GUI.

LogDisplay.tcl is a script which can be sourced into a TclServer to produce a display of occurence logs.  Occurence logs are created programmatically via the CLogger class.  Any number of log display windows can be configured into the system.

Start the Log Display by typing:

/opt/daq/Bin/LogDisplay

This will bring up the following window:

The window is divided into:

• A display of log entries and their column headings
• A set of control buttons:
  •   Filter... Which controls the set of log entries which are visible.
  •   Unfilter which displays all log entries.
  •   Dismiss which allows you to dismiss log entries from the display never to be seen again.
  •   Recover which allows you to reload the log display from the log file daq.log
  •   Hosts... allows you to manipulate the set of hosts which can send log entries to this TclServer.
  •   Exit  exits the program.

The log display pane

The top section of the window displays the set of  active log entries.  Each log entry has the following fields:

• Facility:  The program or set of programs which emitted the log.
• Severity: How severe the condition being logged is.  The legal values here are Success, Warning or Error.  Success log entries are intended to provide a history of operations.  For example, in the picture above, the Readout facility is shown logging run state transitions.
• Message:  Textual message associated with the log entry.  This tells you what is being logged.
• Date/Time: tells you when the log entry was received by the log display program.

Clicking on the column headings resorts.  For example, clicking on the severity column heading yields:

Top Daq users guide

The Filter.. button

  The Filter button allows you to display a logical subset of the logged entries.  The following dialog allows you to set the filter parameters:

• Strong filters continue to filter the incoming occurrence stream. 

Top Daq users guide

The Unfilter button

Removes all filters currently on the log data.

Top Daq users guide

The Dismiss button

Removes the selected set of log entries from the display.

Top Daq users guide

The Recover Button

Restores the log entries from the log files.

Top Daq users guide

The Hosts... Button

Brings up the allowed hosts editor.  This facility allows you to describe the set of hosts which can connect to the log display server:

Top Daq users guide

The Exit Button

The Exit button exits the program.  There must be at least on log display program running in order to accept log entries into the log file.

Top Daq users guide

Last Modified: March 08, 2002 by: fox@nscl.msu.edu
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