Class: Pione::System::FileCache::SimpleCacheMethod

Inherits:
FileCacheMethod show all
Defined in:
lib/pione/system/file-cache.rb

Overview

SimpleCacheMethod is a simple cache method implementation.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SimpleCacheMethod

Creates a method.



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# File 'lib/pione/system/file-cache.rb', line 82

def initialize
  @table = {}
  @tmpdir = Global.file_cache_directory
end

Instance Method Details

#get(uri) ⇒ String

Gets cached data path from the uri resource.

Parameters:

  • resource uri

Returns:

  • cached path



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# File 'lib/pione/system/file-cache.rb', line 92

def get(uri)
  # check cached or not
  unless @table.has_key?(uri)
    # prepare cache path
    path = prepare_cache_path

    # link the resource file to cache path
    Resource[uri].link_to(path)
    @table[uri.to_s] = path
  end

  return @table[uri.to_s]
end

#put(src, uri) ⇒ void

This method returns an undefined value.

Puts the data to uri resource and caches it in local.



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# File 'lib/pione/system/file-cache.rb', line 108

def put(src, uri)
  # prepare cache path
  path = prepare_cache_path

  # move the file from the working directory to cache
  FileUtils.mv(src, path)

  # make a symbolic link from original location to the cache
  FileUtils.symlink(path, src)

  # copy from cache to the resource file
  @table[uri.to_s] = path
  Resource[uri].link_from(path)
end

#shift(old_uri, new_uri) ⇒ void

This method returns an undefined value.

Parameters:

  • old resource uri

  • new resource uri



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# File 'lib/pione/system/file-cache.rb', line 128

def shift(old_uri, new_uri)
  if path = @table[old_uri.to_s]
    if new_uri.scheme == "local"
      FileUtils.symlink(new_uri.path, path, :force => true)
    end
    @table[new_uri.to_s] = path
  end
end