package book.j2se5;

import java.lang.management.ClassLoadingMXBean;
import java.lang.management.CompilationMXBean;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.OperatingSystemMXBean;
import java.lang.management.RuntimeMXBean;
import java.lang.management.ThreadMXBean;
import java.util.List;

public class JDKBean {

 /**
  *MemoryMXBean是Java虚拟机的内存系统的管理接口
  */
 public static void printMemoryMXBean(){
  //获得单一实例
  MemoryMXBean instance=ManagementFactory.getMemoryMXBean();
  System.out.printf("%n--%s--%n",instance.getClass().getName());
  //返回用于对象分配的堆的当前内存
  System.out.printf("%s:%s%n","HeapMemoryUsage",instance.getHeapMemoryUsage());
  //返回java虚拟机使用的非堆内存的当前使用量
  System.out.printf("%s:%s%n","getNonHeapMemoryUsage",instance.getNonHeapMemoryUsage());
  instance.gc();
 }
 /**
  * ClassLoadingMXBean是Java虚拟机的类加载系统的管理接口
  *Java虚拟机具有此接口的实现类的单个实例
  */
 public static void printClassLoadingMXBean(){
  //获得单一实例
  ClassLoadingMXBean instance=ManagementFactory.getClassLoadingMXBean();
  System.out.printf("%n--%s--%n",instance.getClass().getName());
  //返回当前加载Java虚拟机中的类的数量
  System.out.printf("%s:%s%n","LoadedClassCount",instance.getLoadedClassCount());
  //返回自Java虚拟机开始执行到目前已经加载的类的总数
  System.out.printf("%s:%s%n","TotalLoadedClassCount",instance.getTotalLoadedClassCount());
  //返回自Java虚拟机开始执行到目前已经卸载的类的总数
  System.out.printf("%s:%s%n","UnloadedClassCount",instance.getUnloadedClassCount());
 }
 /**
  *ThreadMXBean是Java虚拟机线程系统的管理接口
  *Java虚拟机具有此接口的实现类的单个实例
  */
 public static void printThreadMXBean(){
  //获得单一实例
  ThreadMXBean instance=ManagementFactory.getThreadMXBean();
  System.out.printf("%n---%s---%n",instance.getClass().getName());
  //返回活动线程的当前数目，包括守护线程和非守护线程
  System.out.printf("%s:%s%n","ThreadCount",instance.getThreadCount());
  //返回活动线程ID
  System.out.printf("%s:%n","Thread IDs");
  long[] ids=instance.getAllThreadIds();
  for(long id:ids){
   System.out.printf("%s; ",id);
  }
  System.out.printf("%n");
  //返回活动守护线程的当前数目
  System.out.printf("%s:%s%n","DaemonThreadCount",instance.getDaemonThreadCount());
  //返回自从Java虚拟机启动或峰值重置以来峰值活动线程计数
  System.out.printf("%s:%s%n","PeakThreadCount",instance.getPeakThreadCount());
  //返回当前线程的总CPU时间
  System.out.printf("%s:%s%n","CurrentThreadCpuTime",instance.getCurrentThreadCpuTime());
  //返回当前线程在用户模式中执行的CPU
  System.out.printf("%s:%s%n","CurrentThreadUserTime",instance.getCurrentThreadUserTime());
  
 }
 public static void printRuntimeMXBean(){
  RuntimeMXBean instance=ManagementFactory.getRuntimeMXBean();
  System.out.printf("%n---%s---%n",instance.getClass().getName());
  System.out.printf("%s:%s%n","BootClassPath",instance.getBootClassPath());
  System.out.printf("%s:%s%n","ClassPath",instance.getClassPath());
  System.out.printf("%s%n","InputArguments");
  List<String> args=instance.getInputArguments();
  for(String arg:args){
   System.out.printf("%s; ", arg);
  }
  System.out.printf("%s:%s%n","LibraryPath",instance.getLibraryPath());
  System.out.printf("%s:%s%n", "ManagementSpecVersion",instance.getManagementSpecVersion());
  System.out.printf("%s:%s%n", "Name",instance.getName());
  System.out.printf("%s:%s%n","SpecName",instance.getSpecName());
  System.out.printf("%s:%s%n","SpecVersion",instance.getSpecVersion());
  System.out.printf("%s:%s%n","VmlName",instance.getVmName());
  System.out.printf("%s:%s%n","VmVendor",instance.getVmVendor());
  System.out.printf("%s:%s%n","VmVersion",instance.getVmVersion());
  System.out.printf("%s:%s%n","StartTime",instance.getStartTime());
  System.out.printf("%s:%s%n","Uptime",instance.getUptime());
 }
 public static void printCompilationMXBean(){
  CompilationMXBean instance=ManagementFactory.getCompilationMXBean();
  System.out.printf("%n---%s---%n",instance.getClass().getName());
  System.out.printf("%s:%s%n","Name",instance.getName());
  System.out.printf("%s:%s%n","TotalCompilationTime",instance.getTotalCompilationTime());
 }
 public static void printGarbageCollectionMXBean(){
  List<GarbageCollectorMXBean> instances=ManagementFactory.getGarbageCollectorMXBeans();
  System.out.printf("%n---%s---%n",GarbageCollectorMXBean.class.getName());
  for(GarbageCollectorMXBean instance:instances){
   System.out.printf("***%s:%s***%n","Name",instance.getName());
   System.out.printf("%s:%s%n","CollectionCount",instance.getCollectionCount());
   System.out.printf("%s:%s%n","CollectionTime",instance.getCollectionTime());
  }
  
 }
 public static void printOperationSystemMXBean(){
  OperatingSystemMXBean instance=ManagementFactory.getOperatingSystemMXBean();
  System.out.printf("%n---%s---%n",instance.getClass().getName());
  System.out.printf("%s:%s%n","Arch",instance.getArch());
  System.out.printf("%s:%s%n","AvailableProcessors",instance.getAvailableProcessors());
  System.out.printf("%s:%s%n","Name",instance.getName());
  System.out.printf("%s:%s%n","Version",instance.getVersion());
 }
 public static void main(String[] args) {
  JDKBean.printOperationSystemMXBean();
  JDKBean.printRuntimeMXBean();
  JDKBean.printClassLoadingMXBean();
  JDKBean.printCompilationMXBean();
  JDKBean.printMemoryMXBean();
  JDKBean.printThreadMXBean();
  JDKBean.printGarbageCollectionMXBean();
 }

}