Class: InfoparkComponentCache::Guards::ValidFrom

Inherits:
CmsStateGuard show all
Defined in:
lib/infopark_component_cache/guards/valid_from.rb

Overview

This guard ensures that any object that becomes valid (through valid_from) will cause inconsistency

Author:

Direct Known Subclasses

DelayedValidFrom

Instance Attribute Summary

Attributes inherited from ConsistencyGuard

#component, #options

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_from.

Returns:



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# File 'lib/infopark_component_cache/guards/valid_from.rb', line 32

def cache_key
  component.cache_key("min_valid_from")
end

#consistent? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/infopark_component_cache/guards/valid_from.rb', line 9

def consistent?
  if min_valid_from_known?
    no_changes_since?
  else
    current_min_valid_from.nil?
  end
end

#current_min_valid_from ⇒ Time

Returns the timestamp of the most recent valid_from, or nil if none found.

Returns:

  • (Time) —

    the timestamp of the most recent valid_from, or nil if none found



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# File 'lib/infopark_component_cache/guards/valid_from.rb', line 37

def current_min_valid_from
  str_value = scoped_relation.where("valid_from > ?", Time.now.to_iso).minimum(:valid_from)
  return str_value if str_value.kind_of? Time

  RailsConnector::DateAttribute.parse(str_value) if str_value.present?
end

#guard! ⇒ Object 



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# File 'lib/infopark_component_cache/guards/valid_from.rb', line 17

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

#min_valid_from_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_from.rb', line 22

def min_valid_from_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_from.rb', line 27

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