Tell Ruby Program to Wait Some Amount of Time
How Do You Tell a Ruby Program to Wait an Arbitrary Amount of Time Before Moving on to the Next Line of Code? 7 Answers Like This: Sleep(Num_Secs) the Num_Secs...
How do you tell a Ruby program to wait an arbitrary amount of time before moving on to the next line of code?
7 Answers
Like this:
sleep(num_secs)
The num_secs value can be an integer or float.
Also, if you're writing this within a Rails app, or have included the ActiveSupport library in your project, you can construct longer intervals using the following convenience syntax:
sleep(4.minutes)
# or, even longer...
sleep(2.hours); sleep(3.days) # etc., etc.
# or shorter
sleep(0.5) # half a second
Use sleep like so:
sleep 2
That'll sleep for 2 seconds.
Be careful to give an argument. If you just run sleep, the process will sleep forever. (This is useful when you want a thread to sleep until it's woken.)
I find until very useful with sleep. example:
> time = Time.now
> sleep 2.seconds until Time.now > time + 10.seconds # breaks when true
> # or
> sleep 2 and puts 'still sleeping' until Time.now > time + 10
> # or
> sleep 1.seconds until !req.loading # suggested by ohsully
Like this
sleep(no_of_seconds)
Or you may pass other possible arguments like:
sleep(5.seconds)
sleep(5.minutes)
sleep(5.hours)
sleep(5.days)
Implementation of seconds/minutes/hours, which are rails methods. Note that implicit returns aren't needed, but they look cleaner, so I prefer them. I'm not sure Rails even has .days or if it goes further, but these are the ones I need.
class Integer
def seconds
return self
end
def minutes
return self * 60
end
def hours
return self * 3600
end
def days
return self * 86400
end
end
After this, you can do:
sleep 5.seconds to sleep for 5 seconds. You can do sleep 5.minutes to sleep for 5 min. You can do sleep 5.hours to sleep for 5 hours. And finally, you can do sleep 5.days to sleep for 5 days... You can add any method that return the value of self * (amount of seconds in that timeframe).
As an exercise, try implementing it for months!
sleep 6 will sleep for 6 seconds. For a longer duration, you can also use sleep(6.minutes) or sleep(6.hours).
This is an example of using sleep with sidekiq
require 'sidekiq'
class PlainOldRuby
include Sidekiq::Worker
def perform(how_hard="super hard", how_long=10)
sleep how_long
puts "Workin' #{how_hard}"
end
end
sleep for 10 seconds and print out "Working super hard" .
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