org.spf4j.os.ProcessUtil Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of spf4j-core Show documentation

A continuously growing collection of utilities to measure performance, get better diagnostics, improve performance, or do things more reliably, faster that other open source libraries...

There is a newer version: 8.10.0

Show newest version

/*
 * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Additionally licensed with:
 *
 * Licensed under the Apache Licens e, 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.spf4j.os;

import com.sun.jna.Pointer;
import com.sun.jna.platform.win32.Kernel32;
import com.sun.jna.platform.win32.WinNT;
import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import java.lang.reflect.Field;
import javax.annotation.Signed;
import org.spf4j.base.UncheckedExecutionException;

/**
 * PID is exposed in jdk 9... some of this will go away.
 * @author Zoltan Farkas
 */
public final class ProcessUtil {

  private static final int PID = parsePid();

  private ProcessUtil() { }

  private static int parsePid()  {
    RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
    String mxBeanName = runtimeMxBean.getName();
    int atIdx = mxBeanName.indexOf('@');
    if (atIdx < 0) {
      return -1;
    } else {
      return Integer.parseInt(mxBeanName.substring(0, atIdx));
    }
  }

  /**
   * @return the jvm process ID, -1 if it cannot be figured out.
   */
  @Signed
  public static int getPid() {
    return PID;
  }


  public static int getPid(final Process p) {
    if (OperatingSystem.isWindows()) {
      return getWindowsPid(p);
    }
    return getUnixPid(p);
  }

  private static int getUnixPid(final Process p) {
    try {
      Field pidF = p.getClass().getDeclaredField("pid");
      pidF.setAccessible(true);
      return pidF.getInt(p);
    } catch (IllegalAccessException | NoSuchFieldException | SecurityException ex) {
      throw new UncheckedExecutionException("Cannot get PID for " + p, ex);
    }
  }

  private static int getWindowsPid(final Process p) {
    Field f;
    long lHandle;
    try {
      f = p.getClass().getDeclaredField("handle");
      f.setAccessible(true);
      lHandle = f.getLong(p);
    } catch (NoSuchFieldException | SecurityException | IllegalAccessException ex) {
      throw new UncheckedExecutionException("Cannot get PID for " + p, ex);
    }

    Kernel32 kernel = Kernel32.INSTANCE;
    WinNT.HANDLE handle = new WinNT.HANDLE();
    handle.setPointer(Pointer.createConstant(lHandle));
    return kernel.GetProcessId(handle);
  }

}