Class: InfoparkComponentCache::Guards::ValidUntil

Inherits:
ConsistencyGuard show all
Defined in:
lib/infopark_component_cache/guards/valid_until.rb

Overview

This guard ensures that any object, whose valid until date has been passed will cause inconsistency.

Author:

Instance Attribute Summary

Attributes inherited from ConsistencyGuard

#component

Instance Method Summary collapse

Methods inherited from ConsistencyGuard

#cache, #initialize

Constructor Details

This class inherits a constructor from InfoparkComponentCache::ConsistencyGuard

Instance Method Details

#cache_key ⇒ String

Returns the cache key for storing #current_min_valid_until.

Returns:



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# File 'lib/infopark_component_cache/guards/valid_until.rb', line 33

def cache_key
  component.cache_key('min_valid_until')
end

#consistent? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/infopark_component_cache/guards/valid_until.rb', line 10

def consistent?
  if min_valid_until_known?
    return no_changes_since?
  else
    return current_min_valid_until.nil?
  end
end

#current_min_valid_until ⇒ Time

Returns the timestamp of the the object that will be deactivated in nearest future.

Returns:

  • (Time) —

    the timestamp of the the object that will be deactivated in nearest future



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# File 'lib/infopark_component_cache/guards/valid_until.rb', line 38

def current_min_valid_until
  str_value = RailsConnector::Obj.where('valid_until > ?', Time.now.to_iso).minimum(:valid_until)
  if str_value.present?
    RailsConnector::DateAttribute.parse(str_value)
  else
    nil
  end
end

#guard! ⇒ Object 



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# File 'lib/infopark_component_cache/guards/valid_until.rb', line 18

def guard!
  cache.write(cache_key, current_min_valid_until)
end

#min_valid_until_known? ⇒ Boolean

Returns true if a timestamp can be read from cache with #cache_key.

Returns:

  • (Boolean) —

    true if a timestamp can be read from cache with #cache_key



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# File 'lib/infopark_component_cache/guards/valid_until.rb', line 23

def min_valid_until_known?
  cache.exist?(cache_key) && cache.read(cache_key).kind_of?(Time)
end

#no_changes_since? ⇒ Boolean

Returns true if no obj has been changed since last #guard!.

Returns:

  • (Boolean) —

    true if no obj has been changed since last #guard!



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# File 'lib/infopark_component_cache/guards/valid_until.rb', line 28

def no_changes_since?
  current_min_valid_until == cache.read(cache_key) && current_min_valid_until > Time.now
end