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Script Keeping Track of Itself
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ns_sched(3aolserver) AOLserver Built-In Commands ns_sched(3aolserver) __________________________________________________________________________________________________________________________________________________ NAME
ns_after, ns_cancel, ns_pause, ns_resume, ns_schedule_daily, ns_schedule_proc, ns_schedule_weekly, ns_unschedule_proc - commands SYNOPSIS
ns_after seconds {script | procname ?args?} ns_cancel id ns_pause id ns_resume id ns_schedule_daily ?-thread? ?-once? hour minute {script | procname ?args?} ns_schedule_proc ?-thread? ?-once? interval {script | procname ?args?} ns_schedule_weekly ?-thread? ?-once? day hour minute {script | procname ?args?} ns_unschedule_proc id _________________________________________________________________ DESCRIPTION
ns_after run the specified script or procedure after the specified number of seconds ns_after returns an id which can be used with the ns_pause, ns_cancel and ns_resume apis. ns_cancel stops the scheduled running of the id returned by an ns_after returns 1 if unscheduled 0 if the script of procedure couldn't be unscheduled ns_pause pauses the scheduled running of the id returned by an ns_after returns 1 if paused, 0 if the script of procedure couldn't be paused ns_resume resumes the scheduled running of the id returned by an ns_after returns 1 if resumed, 0 if the script of procedure couldn't be resumed ns_schedule_daily ns_schedule_daily runs the specified Tcl script or procedure (procname) once a day at the time specified by hour and minute. The hour can be from 0 to 23, and the minute can be from 0 to 59. Specify -thread if you want a thread created to run the procedure. This will allow the scheduler to continue with other scheduled procedures. Specifying -thread is appropriate in situations where the script will not return immediately, such as when the script performs network activity. Specify -once if you want the script to run only one time. The default is that the script will be re-scheduled after each time it is run. ns_schedule_daily returns an id number for the scheduled procedure that is needed to stop the scheduled procedure with ns_unsched- ule_proc. ns_schedule_proc ns_schedule_proc runs the specified Tcl script or procedure (procname) at an interval specified by interval. The interval is the number of seconds between runs of the script. Specify -thread if you want a thread created to run the procedure. This will allow the scheduler to continue with other scheduled procedures. Specifying -thread is appropriate in situations where the script will not return immediately, such as when the script performs network activity. Specify -once if you want the script to run only one time. The default is that the script will be re-scheduled after each time it is run. ns_schedule_proc returns an id number for the scheduled procedure that is needed to stop the scheduled procedure with ns_unsched- ule_proc. ns_schedule_weekly ns_schedule_weekly runs the specified Tcl script or procedure (procname) once a week on the day specified by day and the time speci- fied by hour and minute. The day can be from 0 to 6, where 0 represents Sunday. The hour can be from 0 to 23, and the minute can be from 0 to 59. Specify -thread if you want a thread created to run the procedure. This will allow the scheduler to continue with other scheduled procedures. Specifying -thread is appropriate in situations where the script will not return immediately, such as when the script performs network activity. Specify -once if you want the script to run only one time. The default is that the script will be re-scheduled after each time it is run. ns_schedule_weekly returns an id number for the scheduled procedure that is needed to stop the scheduled procedure with ns_unsched- ule_proc. ns_unschedule_proc id ns_unschedule_proc stops a scheduled procedure from executing anymore. The scheduled procedure to be stopped is identified by its id, which was returned by the ns_schedule* function that was used to schedule the procedure. EXAMPLES
ns_after ns_cancel ns_pause ns_resume This example illustrates a web interface used to manage jobs. Depending on the action provided a job can be created, cancelled, paused or resumed. set action [ns_queryget action] set job [ns_queryget job] switch $action { create { set job [ns_after 10 [ns_queryget script]] ns_puts "Job created with id: $job" } cancel { if {[ns_cancel $job]} { ns_puts "Job $job cancelled" } else { ns_puts "Job $job not cancelled" } } pause { if {[ns_pause $job]} { ns_puts "Job $job paused" } else { ns_puts "Job $job not paused } } resume { if {[ns_resume $job]} { ns_puts "Job $job resumed" } else { ns_puts "Job $job couldn't be resumed" } } default { ns_puts "Invalid action $action" } } ns_schedule_daily This example defines a script called rolllog that uses ns_accesslog to roll the access log to a file with an extension containing the current date. The ns_schedule_daily function is used to execute the rolllog script on a daily basis. # Script to roll and rcp log file to host "grinder" proc rolllog {} { set suffix [ns_strftime "%y-%m-%d"] set new [ns_accesslog file].$suffix ns_accesslog roll $new exec rcp $new grinder:/logs/[file tail $new] } # Schedule "rolllog" to run at 3:30 am each morning ns_schedule_daily -thread 3 30 rolllog ns_schedule_proc proc dosomething blah { ns_log Notice "proc with arg '$blah'" } ns_schedule_proc 10 dosomething $arg1 SEE ALSO
KEYWORDS
schedule pause resume unschedule cancel after AOLserver 4.0 ns_sched(3aolserver)
