如何運行一個程序並在運行程序時定期檢查輸出是否存在

Question

我想運行一個正在生成一些文件的腳本，並且希望每3分鐘檢查腳本生成的文件的存在。

我做了以下內容，

def periodic_method time, block 
    t = EventMachine::PeriodicTimer.new(time) {eval(block)} 
    begin 
     yield 
    ensure 
     t.cancel 
    end 
end 

periodic_method(60, "if File.exists(file1.txt) then puts 'done with step 1' else puts 'running generator'") do 
    generator.rb 
end 

運行時我得到錯誤錯的沒有參數。

這裏是堆棧跟蹤： -

wrong number of arguments (1 for 0) 
/tools/simulation/simulation_assemble/test.rb:652:in `eval' 
(eval):1:in `block in periodic_block' 
/tools/simulation/simulation_assemble/test.rb:652:in `eval' 
/tools/simulation/simulation_assemble/test.rb:652:in `block in periodic_block' 
/tool/pandora64/.package/ruby-1.9.2-p136/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.4 
/lib/em/timers.rb:52:in `call' 
/tool/pandora64/.package/ruby-1.9.2-p136/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.4/lib/em/timers.rb:52:in `fire' 
/tool/pandora64/.package/ruby-1.9.2-p136/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.4/lib/eventmachine.rb:206:in `call' 
/tool/pandora64/.package/ruby-1.9.2-p136/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.4/lib/eventmachine.rb:206:in `run_machine' 
/tool/pandora64/.package/ruby-1.9.2-p136/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.4/lib/eventmachine.rb:206:in `run' 
generator.rb:195:in `block in run' 
generator.rb:168:in `standard_exception_handling' 
generator:191:in `run' 
generator:28:in `< main>' 

在實現我的任務任何人的幫助？

有沒有其他的方式來完成這項任務？

Answer 1

我會用rufus-scheduler爲

require 'rufus-scheduler' 

scheduler = Rufus::Scheduler.new 

scheduler.every '3m' do 
    # run script here; would this do? 
    puts "running generator..." 
    `ruby generator.rb` 
    puts "done generating..." 
    # now when the script is done, 
    # check if File.exists? 
end 

scheduler.every '3m' do 
    # do other things in another thread 
end 

scheduler.join 

sleep 1 while true # in order for your program to stay alive