Class: WaterDrop::Helpers::Counter

Inherits:

Object

• Object
• WaterDrop::Helpers::Counter

Defined in:

lib/waterdrop/helpers/counter.rb

Overview

Atomic counter that we can safely increment and decrement without race conditions

Instance Attribute Summary

• #value ⇒ Integer readonly

  Current value.

Instance Method Summary

• #decrement ⇒ Object

  Decrements the value by 1.

• #increment ⇒ Object

  Increments the value by 1.

• #initialize ⇒ Counter constructor

  Creates a new counter initialized to 0.

Constructor Details

#initialize ⇒ Counter

Creates a new counter initialized to 0

# File 'lib/waterdrop/helpers/counter.rb', line 12

def initialize
  @value = 0
  @mutex = Mutex.new
end

Instance Attribute Details

#value ⇒ Integer (readonly)

Returns current value.

Returns:

• (Integer) —

  current value

# File 'lib/waterdrop/helpers/counter.rb', line 9

def value
  @value
end

Instance Method Details

#decrement ⇒ Object

Decrements the value by 1

# File 'lib/waterdrop/helpers/counter.rb', line 23

def decrement
  @mutex.synchronize { @value -= 1 }
end

#increment ⇒ Object

Increments the value by 1

# File 'lib/waterdrop/helpers/counter.rb', line 18

def increment
  @mutex.synchronize { @value += 1 }
end