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/*
 * 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.hbase.util;

import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;

/**
 * Process related utilities.
 */
@InterfaceAudience.Private
public final class ProcessUtils {
  private static Log LOG = LogFactory.getLog(ProcessUtils.class);

  private ProcessUtils() { }

  public static Integer getPid() {
    // JVM_PID is exported by bin/hbase run script
    String pidStr = System.getenv("JVM_PID");

    // in case if it is not set correctly used fallback from mxbean which is implementation specific
    if (pidStr == null || pidStr.trim().isEmpty()) {
      String name = ManagementFactory.getRuntimeMXBean().getName();
      if (name != null) {
        int idx = name.indexOf("@");
        if (idx != -1) {
          pidStr = name.substring(0, name.indexOf("@"));
        }
      }
    }
    try {
      if (pidStr != null) {
        return Integer.valueOf(pidStr);
      }
    } catch (NumberFormatException nfe) {
      // ignore
    }
    return null;
  }

  public static Process runCmdAsync(List cmd) {
    try {
      LOG.info("Running command async: " + cmd);
      return new ProcessBuilder(cmd).inheritIO().start();
    } catch (IOException ex) {
      throw new IllegalStateException(ex);
    }
  }
}