Class: WCC::Contentful::Store::LazyCacheStore

Inherits:
Object
  • Object
show all
Defined in:
lib/wcc/contentful/store/lazy_cache_store.rb

Instance Method Summary collapse

Constructor Details

#initialize(client, cache: nil) ⇒ LazyCacheStore

Returns a new instance of LazyCacheStore.



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# File 'lib/wcc/contentful/store/lazy_cache_store.rb', line 12

def initialize(client, cache: nil)
  @cdn = CDNAdapter.new(client)
  @cache = cache || ActiveSupport::Cache::MemoryStore.new
end

Instance Method Details

#delete(key) ⇒ Object 



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# File 'lib/wcc/contentful/store/lazy_cache_store.rb', line 60

def delete(key)
  old = @cache.read(key)
  @cache.delete(key)
  old
end

#find(key) ⇒ Object 



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# File 'lib/wcc/contentful/store/lazy_cache_store.rb', line 17

def find(key)
  found =
    @cache.fetch(key) do
      # if it's not a contentful ID don't hit the API.
      # Store a nil object if we can't find the object on the CDN.
      (@cdn.find(key) || nil_obj(key)) if key =~ /^\w+$/
    end

  case found.try(:dig, 'sys', 'type')
  when 'Nil', 'DeletedEntry', 'DeletedAsset'
    nil
  else
    found
  end
end

#index(json) ⇒ Object

#index is called whenever the sync API comes back with more data.



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# File 'lib/wcc/contentful/store/lazy_cache_store.rb', line 34

def index(json)
  id = json.dig('sys', 'id')
  return unless prev = @cache.read(id)

  if (prev_rev = prev&.dig('sys', 'revision')) && (next_rev = json.dig('sys', 'revision'))
    return prev if next_rev < prev_rev
  end

  # we also set deletes in the cache - no need to go hit the API when we know
  # this is a nil object
  @cache.write(id, json)

  case json.dig('sys', 'type')
  when 'DeletedEntry', 'DeletedAsset'
    nil
  else
    json
  end
end

#nil_obj(id) ⇒ Object 



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# File 'lib/wcc/contentful/store/lazy_cache_store.rb', line 66

def nil_obj(id)
  {
    'sys' => {
      'id' => id,
      'type' => 'Nil',
      'revision' => 1
    }
  }
end

#set(key, value) ⇒ Object 



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# File 'lib/wcc/contentful/store/lazy_cache_store.rb', line 54

def set(key, value)
  old = @cache.read(key)
  @cache.write(key, value)
  old
end