Class: Variable::IVar

Inherits:

Variable

• Object
• Variable
• Variable::IVar

Defined in:

lib/variable.rb

Overview

Shared variable that can be written at most once

ignore :reek:InstanceVariableAssumption

Defined Under Namespace

Classes: Error

Constant Summary

Constants inherited from Variable

EMPTY, TIMEOUT

Instance Method Summary

• #populate_with ⇒ Object

  Populate and return value, use block to compute value if empty.

• #put(value) ⇒ self

  Put value, raises if already full.

Methods inherited from Variable

#initialize, #read, #take, #take_timeout, #try_put, #with

Constructor Details

This class inherits a constructor from Variable

Instance Method Details

#populate_with ⇒ Object

Populate and return value, use block to compute value if empty

The block is guaranteed to be executed at max once.

Subsequent reads are guaranteed to return the block value.

Returns:

• (Object)

# File 'lib/variable.rb', line 250

def populate_with
  return @value if full?

  synchronize do
    perform_put(yield) if empty?
  end

  @value
end

#put(value) ⇒ self

Put value, raises if already full

Parameters:

• value (Object)

Returns:

• (self)

Raises:

• Error if already full

# File 'lib/variable.rb', line 234

def put(value)
  synchronize do
    fail Error, 'is immutable' if full?
    perform_put(value)
  end

  self
end