1 files changed, 106 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/vendor/rack-1.1.pre/rack/reloader.rb b/actionpack/lib/action_dispatch/vendor/rack-1.1.pre/rack/reloader.rb
new file mode 100644
index 0000000000..aa2f060be5
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+++ b/actionpack/lib/action_dispatch/vendor/rack-1.1.pre/rack/reloader.rb
@@ -0,0 +1,106 @@
+#          Copyright (c) 2009 Michael Fellinger m.fellinger@gmail.com
+# All files in this distribution are subject to the terms of the Ruby license.
+
+require 'pathname'
+
+module Rack
+
+  # High performant source reloader
+  #
+  # This class acts as Rack middleware.
+  #
+  # What makes it especially suited for use in a production environment is that
+  # any file will only be checked once and there will only be made one system
+  # call stat(2).
+  #
+  # Please note that this will not reload files in the background, it does so
+  # only when actively called.
+  #
+  # It is performing a check/reload cycle at the start of every request, but
+  # also respects a cool down time, during which nothing will be done.
+  class Reloader
+    def initialize(app, cooldown = 10, backend = Stat)
+      @app = app
+      @cooldown = cooldown
+      @last = (Time.now - cooldown)
+      @cache = {}
+      @mtimes = {}
+
+      extend backend
+    end
+
+    def call(env)
+      if @cooldown and Time.now > @last + @cooldown
+        if Thread.list.size > 1
+          Thread.exclusive{ reload! }
+        else
+          reload!
+        end
+
+        @last = Time.now
+      end
+
+      @app.call(env)
+    end
+
+    def reload!(stderr = $stderr)
+      rotation do |file, mtime|
+        previous_mtime = @mtimes[file] ||= mtime
+        safe_load(file, mtime, stderr) if mtime > previous_mtime
+      end
+    end
+
+    # A safe Kernel::load, issuing the hooks depending on the results
+    def safe_load(file, mtime, stderr = $stderr)
+      load(file)
+      stderr.puts "#{self.class}: reloaded `#{file}'"
+      file
+    rescue LoadError, SyntaxError => ex
+      stderr.puts ex
+    ensure
+      @mtimes[file] = mtime
+    end
+
+    module Stat
+      def rotation
+        files = [$0, *$LOADED_FEATURES].uniq
+        paths = ['./', *$LOAD_PATH].uniq
+
+        files.map{|file|
+          next if file =~ /\.(so|bundle)$/ # cannot reload compiled files
+
+          found, stat = figure_path(file, paths)
+          next unless found and stat and mtime = stat.mtime
+
+          @cache[file] = found
+
+          yield(found, mtime)
+        }.compact
+      end
+
+      # Takes a relative or absolute +file+ name, a couple possible +paths+ that
+      # the +file+ might reside in. Returns the full path and File::Stat for the
+      # path.
+      def figure_path(file, paths)
+        found = @cache[file]
+        found = file if !found and Pathname.new(file).absolute?
+        found, stat = safe_stat(found)
+        return found, stat if found
+
+        paths.each do |possible_path|
+          path = ::File.join(possible_path, file)
+          found, stat = safe_stat(path)
+          return ::File.expand_path(found), stat if found
+        end
+      end
+
+      def safe_stat(file)
+        return unless file
+        stat = ::File.stat(file)
+        return file, stat if stat.file?
+      rescue Errno::ENOENT, Errno::ENOTDIR
+        @cache.delete(file) and false
+      end
+    end
+  end
+end