| /** |
| * 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.hadoop.yarn.server.resourcemanager.placement; |
| |
| import java.util.Arrays; |
| import java.util.Set; |
| |
| /** |
| * This class contains all the matcher and some helper methods to generate them. |
| */ |
| public class MappingRuleMatchers { |
| /** |
| * Utility class, hiding constructor. |
| */ |
| private MappingRuleMatchers() {} |
| |
| /** |
| * MatchAllMatcher is a matcher which matches everything. |
| */ |
| public static class MatchAllMatcher implements MappingRuleMatcher { |
| /** |
| * The match will return true in all cases, to match all submissions. |
| * @param variables The variable context, which contains all the variables |
| * @return true |
| */ |
| @Override |
| public boolean match(VariableContext variables) { |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| return "MatchAllMatcher"; |
| } |
| } |
| |
| /** |
| * VariableMatcher will check if a provided variable's value matches the |
| * provided value. The provided value might contain variables as well, which |
| * will get evaluated before the comparison. |
| */ |
| public static class VariableMatcher implements MappingRuleMatcher { |
| /** |
| * Name of the variable to be checked. |
| */ |
| private String variable; |
| /** |
| * The value which should match the variable's value. |
| */ |
| private String value; |
| |
| VariableMatcher(String variable, String value) { |
| this.variable = variable; |
| this.value = value == null ? "" : value; |
| } |
| |
| /** |
| * The method will replace all variables in the value, then compares this |
| * substituted value against the variable's value, if they match we return |
| * true. |
| * If the variable is null we always return false. |
| * @param variables The variable context, which contains all the variables |
| * @return true if the value matches the variable's value, false otherwise |
| */ |
| @Override |
| public boolean match(VariableContext variables) { |
| if (variable == null) { |
| return false; |
| } |
| |
| String substituted = variables.replaceVariables(value); |
| return substituted.equals(variables.get(variable)); |
| } |
| |
| @Override |
| public String toString() { |
| return "VariableMatcher{" + |
| "variable='" + variable + '\'' + |
| ", value='" + value + '\'' + |
| '}'; |
| } |
| } |
| |
| /** |
| * The GroupMatcher will check if any of the user's groups match the provided |
| * group name. It does not care if it's primary or secondary group, it just |
| * checks if the user is member of the expected group. |
| */ |
| public static class UserGroupMatcher implements MappingRuleMatcher { |
| /** |
| * The group which should match the users's groups. |
| */ |
| private String group; |
| |
| UserGroupMatcher(String value) { |
| this.group = value; |
| } |
| |
| /** |
| * The method will match (return true) if the user is in the provided group. |
| * This matcher expect an extraVariableSet to be present in the variable |
| * context, if it's not present, we return false. |
| * If the expected group is null we always return false. |
| * @param variables The variable context, which contains all the variables |
| * @return true if user is member of the group |
| */ |
| @Override |
| public boolean match(VariableContext variables) { |
| Set<String> groups = variables.getExtraDataset("groups"); |
| |
| if (group == null || groups == null) { |
| return false; |
| } |
| |
| String substituted = variables.replaceVariables(group); |
| return groups.contains(substituted); |
| } |
| |
| @Override |
| public String toString() { |
| return "GroupMatcher{" + |
| "group='" + group + '\'' + |
| '}'; |
| } |
| } |
| /** |
| * AndMatcher is a basic boolean matcher which takes multiple other |
| * matcher as it's arguments, and on match it checks if all of them are true. |
| */ |
| public static class AndMatcher implements MappingRuleMatcher { |
| /** |
| * The list of matchers to be checked during evaluation. |
| */ |
| private MappingRuleMatcher[] matchers; |
| |
| /** |
| * Constructor. |
| * @param matchers List of matchers to be checked during evaluation |
| */ |
| AndMatcher(MappingRuleMatcher...matchers) { |
| this.matchers = matchers; |
| } |
| |
| /** |
| * This match method will go through all the provided matchers and call |
| * their match method, if all match we return true. |
| * @param variables The variable context, which contains all the variables |
| * @return true if all matchers match |
| */ |
| @Override |
| public boolean match(VariableContext variables) { |
| for (MappingRuleMatcher matcher : matchers) { |
| if (!matcher.match(variables)) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| return "AndMatcher{" + |
| "matchers=" + Arrays.toString(matchers) + |
| '}'; |
| } |
| } |
| |
| /** |
| * OrMatcher is a basic boolean matcher which takes multiple other |
| * matcher as its arguments, and on match it checks if any of them are true. |
| */ |
| public static class OrMatcher implements MappingRuleMatcher { |
| /** |
| * The list of matchers to be checked during evaluation. |
| */ |
| private MappingRuleMatcher[] matchers; |
| |
| /** |
| * Constructor. |
| * @param matchers List of matchers to be checked during evaluation |
| */ |
| OrMatcher(MappingRuleMatcher...matchers) { |
| this.matchers = matchers; |
| } |
| |
| /** |
| * This match method will go through all the provided matchers and call |
| * their match method, if any of them match we return true. |
| * @param variables The variable context, which contains all the variables |
| * @return true if any of the matchers match |
| */ |
| @Override |
| public boolean match(VariableContext variables) { |
| for (MappingRuleMatcher matcher : matchers) { |
| if (matcher.match(variables)) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| @Override |
| public String toString() { |
| return "OrMatcher{" + |
| "matchers=" + Arrays.toString(matchers) + |
| '}'; |
| } |
| } |
| |
| /** |
| * Convenience method to create a variable matcher which matches against the |
| * username. |
| * @param userName The username to be matched |
| * @return VariableMatcher with %user as the variable |
| */ |
| public static MappingRuleMatcher createUserMatcher(String userName) { |
| return new VariableMatcher("%user", userName); |
| } |
| |
| /** |
| * Convenience method to create a group matcher which matches against the |
| * groups of the user. |
| * @param groupName The groupName to be matched |
| * @return UserGroupMatcher |
| */ |
| public static MappingRuleMatcher createUserGroupMatcher(String groupName) { |
| return new UserGroupMatcher(groupName); |
| } |
| |
| /** |
| * Convenience method to create a composite matcher which matches against the |
| * user's user name and the user's primary group. Only matches if both |
| * matches. |
| * @param userName The username to be matched |
| * @param groupName The groupName to be matched |
| * @return AndMatcher with two matchers one for userName and one for |
| * primaryGroup |
| */ |
| public static MappingRuleMatcher createUserGroupMatcher( |
| String userName, String groupName) { |
| return new AndMatcher( |
| createUserMatcher(userName), |
| createUserGroupMatcher(groupName)); |
| } |
| |
| /** |
| * Convenience method to create a variable matcher which matches against the |
| * submitted application's name. |
| * @param name The name to be matched |
| * @return VariableMatcher with %application as the variable |
| */ |
| public static MappingRuleMatcher createApplicationNameMatcher(String name) { |
| return new VariableMatcher("%application", name); |
| } |
| |
| |
| /** |
| * Convenience method to create a matcher that matches all |
| * @return MatchAllMatcher. |
| */ |
| public static MappingRuleMatcher createAllMatcher() { |
| return new MatchAllMatcher(); |
| } |
| } |