上文說到趴久，由url匹配到app是由journey完成的丸相，那么journey是怎么完成的呢彼棍？
首先回到 routes.rb里，get,post 方法最終是會調(diào)用match方法的,match方法會調(diào)用map_match -> decomposed_match -> ....無數(shù)層弛作，最終會調(diào)用 journey的routes 的 add_route 方法华匾，生成多個(gè)的 Journey::Route 的對象。Journey::Router
ActionDispatch::Routing::RouteSet 作為最后一層rack middleware萨西，在call方法中調(diào)用 Journey::Router::Utils.normalize_path將url標(biāo)準(zhǔn)化以使rourney::route可以辨別
def self.normalize_path(path)
path ||= ""
encoding = path.encoding
path = "/#{path}".dup
path.squeeze!("/".freeze)
path.sub!(%r{/+\Z}, "".freeze)
path.gsub!(/(%[a-f0-9]{2})/) { $1.upcase }
path = "/".dup if path == "".freeze
path.force_encoding(encoding)
path
end
route在app方法中循環(huán)調(diào)用route.app 的call方法,，依次找到匹配url的app并調(diào)用,之后是Routing::RouteSet::Dispatcher.new調(diào)用相對應(yīng)的controller的dispatch方法
def call env
env['PATH_INFO'] = Utils.normalize_path env['PATH_INFO']
find_routes(env).each do |match, parameters, route|
script_name, path_info, set_params = env.values_at('SCRIPT_NAME',
'PATH_INFO',
@params_key)
unless route.path.anchored
env['SCRIPT_NAME'] = (script_name.to_s + match.to_s).chomp('/')
env['PATH_INFO'] = match.post_match
end
env[@params_key] = (set_params || {}).merge parameters
status, headers, body = route.app.call(env)
if 'pass' == headers['X-Cascade']
env['SCRIPT_NAME'] = script_name
env['PATH_INFO'] = path_info
env[@params_key] = set_params
next
end
return [status, headers, body]
end
return [404, {'X-Cascade' => 'pass'}, ['Not Found']]
end
至此葱跋，完成路由
