Class: Jerakia::Cache::File

Inherits:
Object
  • Object
show all
Defined in:
lib/jerakia/cache/file.rb

Class Method Summary collapse

Class Method Details

.add(index, data) ⇒ Object 



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# File 'lib/jerakia/cache/file.rb', line 16

def add(index, data)
  filestate = state(index)
  Jerakia.log.debug("Adding #{index} to file cache with state #{filestate}")
  cache.add(index, data, :state => filestate) if filestate
end

.cache ⇒ Object 



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# File 'lib/jerakia/cache/file.rb', line 5

def cache
  Jerakia::Cache
end

.get(index) ⇒ Object 



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# File 'lib/jerakia/cache/file.rb', line 59

def get(index)
  cache.get(index)
end

.import_file(filename) ⇒ Object 



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# File 'lib/jerakia/cache/file.rb', line 39

def import_file(filename)
  Jerakia.log.debug("Importing file #{filename} to file cache")
  File.read(filename)
end

.retrieve(filename) ⇒ Object

If the cache has a valid copy of the file, then we retrieve it, if the cache doesn’t have a copy, or if the state has changed, then we should add it to the cache again and overite the existing data.

Returns nil if the file doesn’t exist



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# File 'lib/jerakia/cache/file.rb', line 50

def retrieve(filename)
  if valid?(filename)
    Jerakia.log.debug("Using cached contents of #{filename}")
    get(filename)
  else
    add(filename, import_file(filename)) if File.exists?(filename)
  end
end

.state(filename) ⇒ Object

Returns the latest mtime of the file if the file exists and nil if it doesn’t exist.



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# File 'lib/jerakia/cache/file.rb', line 12

def state(filename)
  ::File.stat(filename).mtime if ::File.exist?(filename)
end

.valid?(index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/jerakia/cache/file.rb', line 22

def valid?(index)
  if cache.in_bucket?(index)
    unless File.exists?(index)
      cache.purge(index)
      return false
    end
    metadata = cache.metadata(index)
    if metadata
      metadata[:state] == state(index)
    else
      false
    end
  else
    false
  end
end