Class: RunOnce

Inherits:
Object
  • Object
show all
Defined in:
lib/run_once.rb

Class Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(context) ⇒ RunOnce

Returns a new instance of RunOnce.



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# File 'lib/run_once.rb', line 63

def initialize(context)
  @context = context
end

Class Attribute Details

.db_file ⇒ Object

Returns the value of attribute db_file.



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# File 'lib/run_once.rb', line 4

def db_file
  @db_file
end

Class Method Details

.get_a_context ⇒ Object 



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# File 'lib/run_once.rb', line 15

def get_a_context
  self.new(caller[1])
end

.in(seconds, &bl) ⇒ Object 



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# File 'lib/run_once.rb', line 23

def in(seconds, &bl)
  get_a_context.in(seconds, &bl)
end

.lookup_db(key) ⇒ Object 



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# File 'lib/run_once.rb', line 37

def lookup_db(key)
  retval = nil
  File.open(@db_file, 'r') do |io|
    io.flock(File::LOCK_SH)
    retval = io.readline.strip if search_db(io,key)
  end
  retval
end

.update_db(key, val) ⇒ Object 



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# File 'lib/run_once.rb', line 27

def update_db(key, val)
  formatted_val = '%015.3f' % val.to_f
  File.open(@db_file, 'w+') do |io|
    io.flock(File::LOCK_EX)
    io.rewind
    io.puts key if !search_db(io,key)
    io.puts formatted_val
  end
end

.use_file=(file) ⇒ Object 



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# File 'lib/run_once.rb', line 10

def use_file=(file)
  self.db_file = file
  File.open(@db_file, 'a+') { }
end

.use_path=(path) ⇒ Object 



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# File 'lib/run_once.rb', line 6

def use_path=(path)
  self.use_file = path + "/#{self}.db.#{$$}"
end

.with_context(context) ⇒ Object 



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# File 'lib/run_once.rb', line 19

def with_context(context)
  new(context)
end

Instance Method Details

#in(seconds) ⇒ Object 



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# File 'lib/run_once.rb', line 67

def in(seconds)
  if(!last_happened || last_happened && (Time.now.to_f > (last_happened + seconds.to_f)))
    update_last_happened
    yield
  end
end

#last_happened ⇒ Object 



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# File 'lib/run_once.rb', line 74

def last_happened
  @last_happened ||= (self.class.lookup_db(@context).to_f rescue nil)
end

#update_last_happened ⇒ Object 



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# File 'lib/run_once.rb', line 78

def update_last_happened
  self.class.update_db(@context, Time.now.to_f)
end