Module: DigestD8a

Defined in:
lib/d8a/digestd8a.rb

Overview

Add MD5 digest attributes to data.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#digests ⇒ Object

d8m -> [mod time, digest] info for datum that we’ve seen



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# File 'lib/d8a/digestd8a.rb', line 33

def digests
  @digests
end

Class Method Details

.extended(d8a) ⇒ Object 



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# File 'lib/d8a/digestd8a.rb', line 36

def DigestD8a.extended(d8a)
  d8a.extend CacheD8a
  d8a.synthetic_attr :md5


  # redefine read/write to capture digests
  class << d8a
    alias_method :__digestd8a_read, :read
    def read(d8m)
      __digestd8a_read(d8m) do |f|
        f.extend(DigestIO)
        result = yield f
        self[d8m, :md5] = f.digest.to_s
        result
      end
    end


    alias_method :__digestd8a_write, :write
    def write(d8m)
      digest = nil
      __digestd8a_write(d8m) do |f|
        f.extend(DigestIO)
        digest = f.digest
        yield f
      end

      # have to set this after the block since the id_attrs check
      # in the caching logic will blow away anything we set before
      # write returns

      self[d8m, :md5] = digest.to_s
    end
  end
end

Instance Method Details

#compute_digest(d8m) ⇒ Object

forces recomputation of digest for a d8m



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# File 'lib/d8a/digestd8a.rb', line 74

def compute_digest(d8m)
  read(d8m) {|f|}
end

#compute_digests ⇒ Object

force recomputation of all digests



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# File 'lib/d8a/digestd8a.rb', line 80

def compute_digests
  self.each { |d8m| compute_md5(d8m) }
end