Retrieving Information on OS Processes

Introduction

ProcessHandle interface can obtain information regarding operating system processes.

import java.nio.file.Paths;
import java.time.Duration;
import java.util.Optional;

public class Main {
    public static void main (String[] args){
        ProcessHandle.allProcesses()
                .forEach(System.out::println);

        ProcessHandle.allProcesses()
                .forEach(h->System.out.println(formattedProcess(h)));

        ProcessHandle.allProcesses()
                .forEach(h->System.out.println(listOsUser(h)));
    }

    public static ProcessHandle.Info obtainInfo(ProcessHandle handle){
        return handle.info();
    }
    
    public static String formattedProcess(ProcessHandle handle){
        long pid = handle.getPid();
        boolean alive = handle.isAlive();
        Optional<Duration> cpuDuration = handle.info().totalCpuDuration();
        Optional<String> handleName = handle.info().command();
        return pid + " " + alive + " " + handleName + ":"+ cpuDuration;
     }
    
    public static String listOsUser(ProcessHandle handle){
        ProcessHandle.Info procInfo = handle.info();
        return handle.getPid() + ": " +procInfo.user();
    }
}

Retrieving Information on OS Processes - Java Native OS

Introduction

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