Class: Sparkplug::Cachers::Filesystem

Inherits:
Abstract
  • Object
show all
Defined in:
lib/sparkplug/cachers/filesystem.rb

Overview

Reads sparkline data from CSV files. Only the first line of numbers are read. Requests for “/sparks/stats.csv” will pass a data_path of “stats.csv”

Instance Attribute Summary collapse

Attributes inherited from Abstract

#png_path

Instance Method Summary collapse

Methods inherited from Abstract

#create_sparklines, #serve, #set

Constructor Details

#initialize(directory) ⇒ Filesystem

Returns a new instance of Filesystem.



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# File 'lib/sparkplug/cachers/filesystem.rb', line 10

def initialize(directory)
  @directory = directory
  super()
end

Instance Attribute Details

#directory ⇒ Object

Returns the value of attribute directory.



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# File 'lib/sparkplug/cachers/filesystem.rb', line 8

def directory
  @directory
end

Instance Method Details

#exists? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sparkplug/cachers/filesystem.rb', line 24

def exists?
  File.file?(@cache_file)
end

#png_path=(s) ⇒ Object 



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# File 'lib/sparkplug/cachers/filesystem.rb', line 15

def png_path=(s)
  @cache_file = File.join(@directory, s)
  @png_path   = s
end

#save(data, options) ⇒ Object 



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# File 'lib/sparkplug/cachers/filesystem.rb', line 32

def save(data, options)
  FileUtils.mkdir_p(File.dirname(@cache_file))
  File.open(@cache_file, 'wb') do |png|
    png << create_sparklines(data, options)
  end
end

#size ⇒ Object 



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# File 'lib/sparkplug/cachers/filesystem.rb', line 20

def size
  @size ||= File.size(@cache_file)
end

#stream ⇒ Object 



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# File 'lib/sparkplug/cachers/filesystem.rb', line 39

def stream
  ::File.open(@cache_file, "rb") do |file|
    while part = file.read(8192)
      yield part
    end
  end
end

#updated_at ⇒ Object 



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# File 'lib/sparkplug/cachers/filesystem.rb', line 28

def updated_at
  @updated_at ||= File.mtime(@cache_file)
end