Class: MeterCat::Cache

Inherits:
Hash
  • Object
show all
Includes:
Singleton
Defined in:
app/models/meter_cat/cache.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Cache

Returns a new instance of Cache.



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# File 'app/models/meter_cat/cache.rb', line 7

def initialize
  return if Rails.env.test?
  at_exit { MeterCat::Cache.instance.flush_all }
end

Instance Method Details

#add(name, value, created_on) ⇒ Object

Adds the given value to the hash Flushes expired data to DB



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# File 'app/models/meter_cat/cache.rb', line 15

def add(name, value, created_on)
  meter = fetch(name, nil)

  # If the name isn't cached, cache it and return
  return cache(name, value, created_on) unless meter

  # If the cached value is for a different day, flush it, cache the new value and return
  if meter.created_on != created_on
    flush(name)
    cache(name, value, created_on)
    return
  end

  # Add the new value to the cached value and flush if expired
  meter.value += value
  flush(name) if meter.expired?
end

#cache(name, value, created_on) ⇒ Object

Creates a new Meter and stores is in the hash



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# File 'app/models/meter_cat/cache.rb', line 35

def cache(name, value, created_on)
  meter = Meter.new(name: name, value: value, created_on: created_on, created_at: Time.now)
  store(name, meter)
end

#flush(name) ⇒ Object

Flushes data to the DB and removes it from the hash



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# File 'app/models/meter_cat/cache.rb', line 42

def flush(name)
  meter = delete(name)
  return unless meter
  meter.add_with_retry
end

#flush_all ⇒ Object

Flushes all keys



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# File 'app/models/meter_cat/cache.rb', line 50

def flush_all
  keys.each { |key| flush(key) }
end