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;
023import org.apache.yetus.audience.InterfaceAudience;
024import org.slf4j.Logger;
025import org.slf4j.LoggerFactory;
026
027/**
028 * Process related utilities.
029 */
030@InterfaceAudience.Private
031public final class ProcessUtils {
032  private static Logger LOG = LoggerFactory.getLogger(ProcessUtils.class);
033
034  private ProcessUtils() {
035  }
036
037  public static Integer getPid() {
038    // JVM_PID is exported by bin/hbase run script
039    String pidStr = System.getenv("JVM_PID");
040
041    // in case if it is not set correctly used fallback from mxbean which is implementation specific
042    if (pidStr == null || pidStr.trim().isEmpty()) {
043      String name = ManagementFactory.getRuntimeMXBean().getName();
044      if (name != null) {
045        int idx = name.indexOf("@");
046        if (idx != -1) {
047          pidStr = name.substring(0, name.indexOf("@"));
048        }
049      }
050    }
051    try {
052      if (pidStr != null) {
053        return Integer.valueOf(pidStr);
054      }
055    } catch (NumberFormatException nfe) {
056      // ignore
057    }
058    return null;
059  }
060
061  public static Process runCmdAsync(List<String> cmd) {
062    try {
063      LOG.info("Running command async: " + cmd);
064      return new ProcessBuilder(cmd).inheritIO().start();
065    } catch (IOException ex) {
066      throw new IllegalStateException(ex);
067    }
068  }
069}