text: #!/usr/bin/env ambari-python-wrap
  """
  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.
  """
  
  # Python imports
  import imp
  import os
  import traceback
  
  
  
  SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
  STACKS_DIR = os.path.join(SCRIPT_DIR, '../../../stacks/')
  PARENT_FILE = os.path.join(STACKS_DIR, 'service_advisor.py')
  
  try:
    with open(PARENT_FILE, 'rb') as fp:
      service_advisor = imp.load_module('service_advisor', fp, PARENT_FILE, ('.py', 'rb', imp.PY_SOURCE))
  except Exception as e:
    traceback.print_exc()
    print "Failed to load parent"
  
  
  class SliderServiceAdvisor(service_advisor.ServiceAdvisor):
  
    def __init__(self, *args, **kwargs):
      self.as_super = super(SliderServiceAdvisor, self)
      self.as_super.__init__(*args, **kwargs)
  
      self.initialize_logger("SliderServiceAdvisor")
  
      # Always call these methods
      self.modifyMastersWithMultipleInstances()
      self.modifyCardinalitiesDict()
      self.modifyHeapSizeProperties()
      self.modifyNotValuableComponents()
      self.modifyComponentsNotPreferableOnServer()
      self.modifyComponentLayoutSchemes()
  
    def modifyMastersWithMultipleInstances(self):
      """
      Modify the set of masters with multiple instances.
      Must be overriden in child class.
      """
      # Nothing to do
      pass
  
    def modifyCardinalitiesDict(self):
      """
      Modify the dictionary of cardinalities.
      Must be overriden in child class.
      """
      # Nothing to do
      pass
  
    def modifyHeapSizeProperties(self):
      """
      Modify the dictionary of heap size properties.
      Must be overriden in child class.
      """
      self.heap_size_properties = {}
  
    def modifyNotValuableComponents(self):
      """
      Modify the set of components whose host assignment is based on other services.
      Must be overriden in child class.
      """
      # Nothing to do
      pass
  
    def modifyComponentsNotPreferableOnServer(self):
      """
      Modify the set of components that are not preferable on the server.
      Must be overriden in child class.
      """
      # Nothing to do
      pass
  
    def modifyComponentLayoutSchemes(self):
      """
      Modify layout scheme dictionaries for components.
      The scheme dictionary basically maps the number of hosts to
      host index where component should exist.
      Must be overriden in child class.
      """
      # Nothing to do
      pass
  
    def getServiceComponentLayoutValidations(self, services, hosts):
      """
      Get a list of errors.
      Must be overriden in child class.
      """
      # Nothing to do
      return []
  
    def getServiceConfigurationRecommendations(self, configurations, clusterData, services, hosts):
      """
      Entry point.
      Must be overriden in child class.
      """
      self.logger.info("Class: %s, Method: %s. Recommending Service Configurations." %
                  (self.__class__.__name__, inspect.stack()[0][3]))
  
      # Nothing to do
      pass
  
    def getServiceConfigurationsValidationItems(self, configurations, recommendedDefaults, services, hosts):
      """
      Entry point.
      Validate configurations for the service. Return a list of errors.
      The code for this function should be the same for each Service Advisor.
      """
      self.logger.info("Class: %s, Method: %s. Validating Configurations." %
                  (self.__class__.__name__, inspect.stack()[0][3]))
  
      # Nothing to do
      return []
  
  