content: /**
   * 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.
   */
  
  package backtype.storm.security.auth;
  
  import java.util.Collection;
  import java.util.Map;
  
  /**
   * Provides a way to renew credentials on behelf of a user.
   */
  public interface ICredentialsRenewer {
  
      /**
       * Called when initializing the service.
       * 
       * @param conf the storm cluster configuration.
       */
      public void prepare(Map conf);
  
      /**
       * Renew any credentials that need to be renewed. (Update the credentials if needed)
       * 
       * @param credentials the credentials that may have something to renew.
       * @param topologyConf topology configuration.
       */
      public void renew(Map<String, String> credentials, Map topologyConf);
  }
  