class ActiveSupport::Cache::Entry

:nodoc:
using short instance variable names that are lazily defined.
Since cache entries in most instances will be serialized, the internals of this class are highly optimized
on the cache.
expiration time. The expiration time is used to support the :race_condition_ttl option
This class is used to represent cache entries. Cache entries have a value and an optional

def compress(value)

def compress(value)
  Zlib::Deflate.deflate(Marshal.dump(value))
end

def compressed?

def compressed?
  defined?(@compressed) ? @compressed : false
end

def dup_value!

serialize entries to protect against accidental cache modifications.
Duplicates the value in a class. This is used by cache implementations that don't natively

def dup_value!
  if @value && !compressed? && !(@value.is_a?(Numeric) || @value == true || @value == false)
    if @value.is_a?(String)
      @value = @value.dup
    else
      @value = Marshal.load(Marshal.dump(@value))
    end
  end
end

def expired?

the value set when the entry was created.
Checks if the entry is expired. The +expires_in+ parameter can override

def expired?
  @expires_in && @created_at + @expires_in <= Time.now.to_f
end

def expires_at

def expires_at
  @expires_in ? @created_at + @expires_in : nil
end

def expires_at=(value)

def expires_at=(value)
  if value
    @expires_in = value.to_f - @created_at
  else
    @expires_in = nil
  end
end

def initialize(value, options = {})

+:compress+, +:compress_threshold+, and +:expires_in+.
Creates a new cache entry for the specified value. Options supported are

def initialize(value, options = {})
  if should_compress?(value, options)
    @value = compress(value)
    @compressed = true
  else
    @value = value
  end
  @created_at = Time.now.to_f
  @expires_in = options[:expires_in]
  @expires_in = @expires_in.to_f if @expires_in
end

def should_compress?(value, options)

def should_compress?(value, options)
  if value && options[:compress]
    compress_threshold = options[:compress_threshold] || DEFAULT_COMPRESS_LIMIT
    serialized_value_size = (value.is_a?(String) ? value : Marshal.dump(value)).bytesize
    return true if serialized_value_size >= compress_threshold
  end
  false
end

def size

value.size if the data is compressed.
Returns the size of the cached value. This could be less than

def size
  if defined?(@s)
    @s
  else
    case value
    when NilClass
      0
    when String
      @value.bytesize
    else
      @s = Marshal.dump(@value).bytesize
    end
  end
end

def uncompress(value)

def uncompress(value)
  Marshal.load(Zlib::Inflate.inflate(value))
end

def value

def value
  compressed? ? uncompress(@value) : @value
end

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