| /** |
| * 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 org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| /** |
| * Factory class for creating instances of {@link PlacementRule}. |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public final class PlacementFactory { |
| |
| private static final Logger LOG = |
| LoggerFactory.getLogger(PlacementFactory.class); |
| |
| private PlacementFactory() { |
| // Unused. |
| } |
| |
| /** |
| * Create a new {@link PlacementRule} based on the rule class from the |
| * configuration. This is used to instantiate rules by the scheduler which |
| * does not resolve the class before this call. |
| * @param ruleStr The name of the class to instantiate |
| * @param conf The configuration object to set for the rule |
| * @return Created class instance |
| */ |
| public static PlacementRule getPlacementRule(String ruleStr, |
| Configuration conf) |
| throws ClassNotFoundException { |
| Class<? extends PlacementRule> ruleClass = Class.forName(ruleStr) |
| .asSubclass(PlacementRule.class); |
| LOG.info("Using PlacementRule implementation - " + ruleClass); |
| return ReflectionUtils.newInstance(ruleClass, conf); |
| } |
| |
| /** |
| * Create a new {@link PlacementRule} based on the rule class from the |
| * configuration. This is used to instantiate rules by the scheduler which |
| * resolve the class before this call. |
| * @param ruleClass The specific class reference to instantiate |
| * @param initArg The config to set |
| * @return Created class instance |
| */ |
| public static PlacementRule getPlacementRule( |
| Class<? extends PlacementRule> ruleClass, Object initArg) { |
| LOG.info("Creating PlacementRule implementation: " + ruleClass); |
| PlacementRule rule = ReflectionUtils.newInstance(ruleClass, null); |
| rule.setConfig(initArg); |
| return rule; |
| } |
| } |