more copy fixes

models/simple_cache.rb

@@ -0,0 +1,25 @@
+require 'thread'
+require 'time'
+
+module SimpleCache
+  @cache = {}
+  @semaphore = Mutex.new
+
+  class << self
+    def store(name, value, timeout=30)
+      @semaphore.synchronize {
+        @cache[name] = {value: value, expires_at: Time.now+timeout}
+      }
+      value
+    end
+
+    def get(name)
+      @cache[name][:value]
+    end
+
+    def expired?(name)
+      return false if @cache[name] && @cache[name][:expires_at] > Time.now
+      true
+    end
+  end
+end