Class: Resourceful::CacheEntry

Inherits:
Object
  • Object
show all
Defined in:
lib/resourceful/cache_manager.rb

Overview

Represents a previous request and cached response with enough detail to determine construct a cached response to a matching request in the future. It also understands what a matching request means.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(request, response) ⇒ CacheEntry

Returns a new instance of CacheEntry.

Parameters:



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# File 'lib/resourceful/cache_manager.rb', line 204

def initialize(request, response)
  @request_uri = request.uri
  @request_time = request.request_time
  @request_vary_headers = select_request_headers(request, response)
  @response = response
end

Instance Attribute Details

#request_time ⇒ Object (readonly)

The time at which the client believes the request was made.



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# File 'lib/resourceful/cache_manager.rb', line 192

def request_time
  @request_time
end

#request_uri ⇒ Object (readonly)

The URI of the request



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# File 'lib/resourceful/cache_manager.rb', line 195

def request_uri
  @request_uri
end

#request_vary_headers ⇒ Object (readonly)

request_vary_headers is a HttpHeader with keys from the Vary header of the response, plus the values from the matching fields in the request



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# File 'lib/resourceful/cache_manager.rb', line 189

def request_vary_headers
  @request_vary_headers
end

#response ⇒ Object (readonly)

The response to that we are caching



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# File 'lib/resourceful/cache_manager.rb', line 198

def response
  @response
end

Instance Method Details

#select_request_headers(request, response) ⇒ Object

Selects the headers from the request named by the response’s Vary header www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.5.6

Parameters:



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# File 'lib/resourceful/cache_manager.rb', line 230

def select_request_headers(request, response)
  header = Resourceful::Header.new

  response.header['Vary'].each do |name|
    header[name] = request.header[name] if request.header[name]
  end if response.header['Vary']

  header
end

#valid_for?(request) ⇒ Boolean

Returns true if this entry may be used to fullfil the given request, according to the vary headers.

Parameters:

Returns:

  • (Boolean) 


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# File 'lib/resourceful/cache_manager.rb', line 216

def valid_for?(request)
  request.uri == @request_uri and 
    @request_vary_headers.all? {|key, value| 
      request.header[key] == value
    }
end