Class: LowCardTables::LowCardTable::CacheExpiration::FixedCacheExpirationPolicy

Inherits:
Object
  • Object
show all
Defined in:
lib/low_card_tables/low_card_table/cache_expiration/fixed_cache_expiration_policy.rb

Overview

A FixedCacheExpirationPolicy is a very simple kind of cache-expiration policy: the cache expires a certain amount of time after it is filled, every time.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(expiration_time) ⇒ FixedCacheExpirationPolicy

Returns a new instance of FixedCacheExpirationPolicy.



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# File 'lib/low_card_tables/low_card_table/cache_expiration/fixed_cache_expiration_policy.rb', line 7

def initialize(expiration_time)
  unless expiration_time && expiration_time.kind_of?(Numeric) && expiration_time >= 0.0
    raise ArgumentError, "Expiration time must be a nonnegative number, not: #{expiration_time.inspect}"
  end

  @expiration_time = expiration_time
end

Instance Attribute Details

#expiration_time ⇒ Object (readonly)

Returns the value of attribute expiration_time.



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# File 'lib/low_card_tables/low_card_table/cache_expiration/fixed_cache_expiration_policy.rb', line 19

def expiration_time
  @expiration_time
end

Instance Method Details

#stale?(cache_time, current_time) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/low_card_tables/low_card_table/cache_expiration/fixed_cache_expiration_policy.rb', line 15

def stale?(cache_time, current_time)
  (current_time - cache_time) >= @expiration_time
end