How do we use every: do: method of pharo?

Question

I've looked in the pharo book and I couldn't see any examples of every:aDuration do:aBlock. I found a Timespan class which when ran does give an error when the object is created and the method is called.

|plan|
plan := Timespan new.
plan start.
" save the file every 30s"
plan
   every:30 seconds do:[ Transcript show:'My message']

Answer 1

Timespan's every:do: doesn't schedule events. You might try forking a background process with a Delay to do that.

I have only Squeak handy at the moment, but it should be more or less the same.

Something like this:

planProcess := [
                 [ 30 seconds asDelay wait.
                   Transcript show: 'Saved (but not really)'; cr.
                 ] repeat.
               ] fork.

To end the process:

planProcess terminate.

There's also a Scheduler you could use for this.