| /* |
| * 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 org.apache.sentry.provider.cache; |
| |
| import java.util.Collections; |
| import org.apache.sentry.core.common.ActiveRoleSet; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /* |
| * The class is used for saving and getting user's privileges when do the hive command like "show tables". |
| * This will enhance the performance for the hive metadata filter. |
| */ |
| public class SimplePrivilegeCache implements PrivilegeCache { |
| |
| private Set<String> cachedPrivileges; |
| |
| public SimplePrivilegeCache(Set<String> cachedPrivileges) { |
| this.cachedPrivileges = cachedPrivileges; |
| } |
| |
| // return the cached privileges |
| @Override |
| public Set<String> listPrivileges(Set<String> groups, ActiveRoleSet roleSet) { |
| if (cachedPrivileges == null) { |
| cachedPrivileges = new HashSet<String>(); |
| } |
| return cachedPrivileges; |
| } |
| |
| @Override |
| public void close() { |
| if (cachedPrivileges != null) { |
| cachedPrivileges = Collections.emptySet(); |
| } |
| } |
| |
| @Override |
| public Set<String> listPrivileges(Set<String> groups, Set<String> users, ActiveRoleSet roleSet) { |
| if (cachedPrivileges == null) { |
| cachedPrivileges = new HashSet<String>(); |
| } |
| return cachedPrivileges; |
| } |
| } |