001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.util;
019
020import java.io.IOException;
021import java.lang.management.ManagementFactory;
022import java.util.List;
023
024import org.slf4j.Logger;
025import org.slf4j.LoggerFactory;
026
027import org.apache.yetus.audience.InterfaceAudience;
028
029/**
030 * Process related utilities.
031 */
032@InterfaceAudience.Private
033public final class ProcessUtils {
034  private static Logger LOG = LoggerFactory.getLogger(ProcessUtils.class);
035
036  private ProcessUtils() { }
037
038  public static Integer getPid() {
039    // JVM_PID is exported by bin/hbase run script
040    String pidStr = System.getenv("JVM_PID");
041
042    // in case if it is not set correctly used fallback from mxbean which is implementation specific
043    if (pidStr == null || pidStr.trim().isEmpty()) {
044      String name = ManagementFactory.getRuntimeMXBean().getName();
045      if (name != null) {
046        int idx = name.indexOf("@");
047        if (idx != -1) {
048          pidStr = name.substring(0, name.indexOf("@"));
049        }
050      }
051    }
052    try {
053      if (pidStr != null) {
054        return Integer.valueOf(pidStr);
055      }
056    } catch (NumberFormatException nfe) {
057      // ignore
058    }
059    return null;
060  }
061
062  public static Process runCmdAsync(List<String> cmd) {
063    try {
064      LOG.info("Running command async: " + cmd);
065      return new ProcessBuilder(cmd).inheritIO().start();
066    } catch (IOException ex) {
067      throw new IllegalStateException(ex);
068    }
069  }
070}