Class: Rack::Sparklines::Handlers::AbstractData

Inherits:
Object
  • Object
show all
Defined in:
lib/rack-sparklines/handlers/abstract_data.rb

Overview

Abstract class for retrieving the data and determining whether the cache needs to be refreshed.

Direct Known Subclasses

CsvData, StubbedData

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#data_path ⇒ Object

Returns the value of attribute data_path.



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# File 'lib/rack-sparklines/handlers/abstract_data.rb', line 8

def data_path
  @data_path
end

Instance Method Details

#already_cached?(cacher) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rack-sparklines/handlers/abstract_data.rb', line 18

def already_cached?(cacher)
  if cache_time = cacher.exists? && cacher.updated_at
    cache_time > updated_at
  end
end

#exists? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rack-sparklines/handlers/abstract_data.rb', line 24

def exists?
  false
end

#fetch ⇒ Object

Yield an array of numbers for sparkline datapoints.

Raises:

  • (NotImplementedError) 


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# File 'lib/rack-sparklines/handlers/abstract_data.rb', line 33

def fetch
  raise NotImplementedError
end

#set(data_path) ⇒ Object

Setting the data_path returns a duplicate of this object that has any custom instance variables (configuration settings, for example).



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# File 'lib/rack-sparklines/handlers/abstract_data.rb', line 12

def set(data_path)
  data = dup
  data.data_path = data_path
  data
end

#updated_at ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/rack-sparklines/handlers/abstract_data.rb', line 28

def updated_at
  raise NotImplementedError
end