| /** |
| * 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.tez.runtime; |
| |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.apache.tez.dag.api.TezUncheckedException; |
| |
| public class RuntimeUtils { |
| |
| private static final Map<String, Class<?>> CLAZZ_CACHE = new ConcurrentHashMap<String, Class<?>>(); |
| |
| private static Class<?> getClazz(String className) { |
| Class<?> clazz = CLAZZ_CACHE.get(className); |
| if (clazz == null) { |
| try { |
| clazz = Class.forName(className); |
| } catch (ClassNotFoundException e) { |
| throw new TezUncheckedException("Unable to load class: " + className, e); |
| } |
| } |
| return clazz; |
| } |
| |
| private static <T> T getNewInstance(Class<T> clazz) { |
| T instance; |
| try { |
| instance = clazz.newInstance(); |
| } catch (InstantiationException e) { |
| throw new TezUncheckedException( |
| "Unable to instantiate class with 0 arguments: " + clazz.getName(), e); |
| } catch (IllegalAccessException e) { |
| throw new TezUncheckedException( |
| "Unable to instantiate class with 0 arguments: " + clazz.getName(), e); |
| } |
| return instance; |
| } |
| |
| public static <T> T createClazzInstance(String className) { |
| Class<?> clazz = getClazz(className); |
| @SuppressWarnings("unchecked") |
| T instance = (T) getNewInstance(clazz); |
| return instance; |
| } |
| } |