1 /** 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 package org.apache.hadoop.security.authorize; 19 20 import java.security.Policy; 21 22 import org.apache.hadoop.classification.InterfaceAudience; 23 import org.apache.hadoop.classification.InterfaceStability; 24 25 /** 26 * {@link PolicyProvider} provides the {@link Service} definitions to the 27 * security {@link Policy} in effect for Hadoop. 28 * 29 */ 30 @InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"}) 31 @InterfaceStability.Evolving 32 public abstract class PolicyProvider { 33 34 /** 35 * Configuration key for the {@link PolicyProvider} implementation. 36 */ 37 public static final String POLICY_PROVIDER_CONFIG = 38 "hadoop.security.authorization.policyprovider"; 39 40 /** 41 * A default {@link PolicyProvider} without any defined services. 42 */ 43 public static final PolicyProvider DEFAULT_POLICY_PROVIDER = 44 new PolicyProvider() { 45 @Override 46 public Service[] getServices() { 47 return null; 48 } 49 }; 50 51 /** 52 * Get the {@link Service} definitions from the {@link PolicyProvider}. 53 * @return the {@link Service} definitions 54 */ getServices()55 public abstract Service[] getServices(); 56 } 57