| /* |
| * 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.util; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| @InterfaceStability.Evolving |
| public class ThreadUtil { |
| |
| private static final Log LOG = LogFactory.getLog(ThreadUtil.class); |
| |
| /** |
| * Cause the current thread to sleep as close as possible to the provided |
| * number of milliseconds. This method will log and ignore any |
| * {@link InterruptedException} encountered. |
| * |
| * @param millis the number of milliseconds for the current thread to sleep |
| */ |
| public static void sleepAtLeastIgnoreInterrupts(long millis) { |
| long start = Time.now(); |
| while (Time.now() - start < millis) { |
| long timeToSleep = millis - |
| (Time.now() - start); |
| try { |
| Thread.sleep(timeToSleep); |
| } catch (InterruptedException ie) { |
| LOG.warn("interrupted while sleeping", ie); |
| } |
| } |
| } |
| |
| /** |
| * Convenience method that returns a resource as inputstream from the |
| * classpath. |
| * <p> |
| * It first attempts to use the Thread's context classloader and if not |
| * set it uses the class' classloader. |
| * |
| * @param resourceName resource to retrieve. |
| * |
| * @throws IOException thrown if resource cannot be loaded |
| * @return inputstream with the resource. |
| */ |
| public static InputStream getResourceAsStream(String resourceName) |
| throws IOException { |
| ClassLoader cl = Thread.currentThread().getContextClassLoader(); |
| if (cl == null) { |
| throw new IOException("Can not read resource file '" + resourceName + |
| "' because class loader of the current thread is null"); |
| } |
| InputStream is = cl.getResourceAsStream(resourceName); |
| if (is == null) { |
| throw new IOException("Can not read resource file '" + |
| resourceName + "'"); |
| } |
| return is; |
| } |
| } |