class ActiveSupport::Cache::Entry

to save space in the cache.
Entry that is put into caches. It supports expiration time on entries and can compress values

def compressed?

def compressed?
  @compressed
end

def create(raw_value, created_at, options = {})

of as serialized Ruby objects.
used by implementations that store cache entries in a native format instead
Create an entry with internal attributes set. This method is intended to be

def create(raw_value, created_at, options = {})
  entry = new(nil)
  entry.instance_variable_set(:@value, raw_value)
  entry.instance_variable_set(:@created_at, created_at.to_f)
  entry.instance_variable_set(:@compressed, options[:compressed])
  entry.instance_variable_set(:@expires_in, options[:expires_in])
  entry
end

def expired?

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

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

def expires_at

Seconds since the epoch when the entry will expire.

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

def expires_at=(time)

Set a new time when the entry will expire.

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

def initialize(value, options = {})

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

def initialize(value, options = {})
  @compressed = false
  @expires_in = options[:expires_in]
  @expires_in = @expires_in.to_f if @expires_in
  @created_at = Time.now.to_f
  if value.nil?
    @value = nil
  else
    @value = Marshal.dump(value)
    if should_compress?(@value, options)
      @value = Zlib::Deflate.deflate(@value)
      @compressed = true
    end
  end
end

def raw_value

Get the raw value. This value may be serialized and compressed.

def raw_value
  @value
end

def should_compress?(serialized_value, options)

def should_compress?(serialized_value, options)
  if options[:compress]
    compress_threshold = options[:compress_threshold] || DEFAULT_COMPRESS_LIMIT
    return true if serialized_value.size >= compress_threshold
  end
  false
end

def size

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

def size
  if @value.nil?
    0
  else
    @value.bytesize
  end
end

def value

Get the value stored in the cache.

def value
  # If the original value was exactly false @value is still true because
  # it is marshalled and eventually compressed. Both operations yield
  # strings.
  if @value
    # In rails 3.1 and earlier values in entries did not marshaled without
    # options[:compress] and if it's Numeric.
    # But after commit a263f377978fc07515b42808ebc1f7894fafaa3a
    # all values in entries are marshalled. And after that code below expects
    # that all values in entries will be marshaled (and will be strings). 
    # So here we need a check for old ones.
    begin
      Marshal.load(compressed? ? Zlib::Inflate.inflate(@value) : @value)
    rescue TypeError
      compressed? ? Zlib::Inflate.inflate(@value) : @value
    end
  end
end

Modules

Classes