text: #!/usr/bin/env python
  """
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you 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.
  
  Slider Agent
  
  """
  
  import os
  
  from resource_management.core import shell
  from resource_management.core.base import Fail
  from resource_management.core.providers import Provider
  from resource_management.core.logger import Logger
  
  
  class ServiceProvider(Provider):
    def action_start(self):
      if not self.status():
        self._exec_cmd("start", 0)
  
    def action_stop(self):
      if self.status():
        self._exec_cmd("stop", 0)
  
    def action_restart(self):
      if not self.status():
        self._exec_cmd("start", 0)
      else:
        self._exec_cmd("restart", 0)
  
    def action_reload(self):
      if not self.status():
        self._exec_cmd("start", 0)
      else:
        self._exec_cmd("reload", 0)
  
    def status(self):
      return self._exec_cmd("status") == 0
  
    def _exec_cmd(self, command, expect=None):
      if command != "status":
        Logger.info("%s command '%s'" % (self.resource, command))
  
      custom_cmd = getattr(self.resource, "%s_command" % command, None)
      if custom_cmd:
        Logger.debug("%s executing '%s'" % (self.resource, custom_cmd))
        if hasattr(custom_cmd, "__call__"):
          if custom_cmd():
            ret = 0
          else:
            ret = 1
        else:
          ret,out = shell.call(custom_cmd)
      else:
        ret = self._init_cmd(command)
  
      if expect is not None and expect != ret:
        raise Fail("%r command %s for service %s failed with return code: %d. %s" % (
        self, command, self.resource.service_name, ret, out))
      return ret
  
    def _init_cmd(self, command):
      if self._upstart:
        if command == "status":
          ret,out = shell.call(["/sbin/" + command, self.resource.service_name])
          _proc, state = out.strip().split(' ', 1)
          ret = 0 if state != "stop/waiting" else 1
        else:
          ret,out = shell.call(["/sbin/" + command, self.resource.service_name])
      else:
        ret,out = shell.call(["/etc/init.d/%s" % self.resource.service_name, command])
      return ret
  
    @property
    def _upstart(self):
      try:
        return self.__upstart
      except AttributeError:
        self.__upstart = os.path.exists("/sbin/start") \
          and os.path.exists("/etc/init/%s.conf" % self.resource.service_name)
      return self.__upstart
  