The log statement writes messages and accompanying date and time information to the correlator’s log file, if one was specified when the correlator was started.

If there is no log file, then the message is written to the correlator’s standard output stream stdout.

The Expression result must be of type string. The value is written only if the current logging level in effect is a priority equal to or higher than the logLevel specified in the log statement, with the exception of OFF. If you do not specify a level, CRIT, the highest priority level, is used. At a logLevel equal to OFF, only logs explicity set to this level will be written. For details, see ta-DevApaAppInEpl_logging_and_printing in Developing Apama Applications in EPL.

For example:

This EPL statement produces a log message that looks like this: