Update README.md

Show how to implement custom `#freeze`.
ioquatix · Jun 27, 2019 · be65b4d · be65b4d
1 parent 10d6ec9
commit be65b4d
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/README.md b/README.md
@@ -70,6 +70,15 @@ class CacheEverythingForever
 		@cache_all_the_things = Concurrent::Map.new
 	end
 
+	def freeze
+		return self if frozen?
+
+		# Don't freeze @cache_all_the_things
+		@app.freeze
+
+		super
+	end
+
 	def call(env)
 		# Use the thread-safe `Concurrent::Map` to fetch the value or store it if it doesn't exist already.
 		@cache_all_the_things.fetch_or_store(env[Rack::PATH_INFO]) do