#
# Copyright (c) 2006 The Apache Software Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

"""
Delegate implementation intended for use with the peer module.
"""

import threading, inspect
from spec import pythonize

class Delegate:

  def __init__(self):
    self.handlers = {}
    self.invokers = {}
    # initialize all the mixins
    self.invoke_all("init")

  def invoke_all(self, meth, *args, **kwargs):
    for cls in inspect.getmro(self.__class__):
      if hasattr(cls, meth):
        getattr(cls, meth)(self, *args, **kwargs)

  def dispatch(self, channel, message):
    method = message.method

    try:
      handler = self.handlers[method]
    except KeyError:
      name = "%s_%s" % (pythonize(method.klass.name),
                        pythonize(method.name))
      handler = getattr(self, name)
      self.handlers[method] = handler

    return handler(channel, message)

  def close(self, reason):
    self.invoke_all("close", reason)
