J2SE5.0新特性之监控与管理

j2se 5.0使用 Java Management Extensions (JMX)来管理和监控java平台。

我们以一个例子来测试一下:

import java.lang.management.ClassLoadingMXBean; import java.lang.management.CompilationMXBean; import java.lang.management.ManagementFactory; import java.lang.management.MemoryMXBean; import java.lang.management.MemoryManagerMXBean; import java.lang.management.MemoryPoolMXBean; import java.lang.management.OperatingSystemMXBean; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.List; public class JDKMBean { public static <T> void printMXBean(Class<T> t,Object object) { Method[] methods = t.getMethods(); T instance = (T)object; System.out.printf("%n---%s---%n", t.getName()); for(Method m:methods) { if (m.getName().startsWith("get")) { try { Object rtValue = m.invoke(instance,new Object[0]); System.out.printf("%s:%s%n",m.getName().substring(3),rtValue); } catch (IllegalArgumentException e1) { } catch (IllegalAccessException e) { } catch (InvocationTargetException e) { } } } } public static <T> void printMXBeans(Class<T> t,List<T> list) { for(T bean:list) { printMXBean(t,bean); } } public static void main(String[] args) { JDKMBean.printMXBean(OperatingSystemMXBean.class,ManagementFactory.getOperatingSystemMXBean()); JDKMBean.printMXBean(CompilationMXBean.class,ManagementFactory.getCompilationMXBean()); JDKMBean.printMXBean(ClassLoadingMXBean.class,ManagementFactory.getClassLoadingMXBean()); JDKMBean.printMXBean(MemoryMXBean.class,ManagementFactory.getMemoryMXBean()); JDKMBean.printMXBeans(MemoryManagerMXBean.class,ManagementFactory.getMemoryManagerMXBeans()); JDKMBean.printMXBeans(MemoryPoolMXBean.class,ManagementFactory.getMemoryPoolMXBeans()); } }

运行结果:

---java.lang.management.OperatingSystemMXBean---

Arch:x86

AvailableProcessors:2

Name:Windows 2000

Version:5.0

---java.lang.management.CompilationMXBean---

TotalCompilationTime:5

Name:HotSpot Client Compiler

---java.lang.management.ClassLoadingMXBean---

LoadedClassCount:431

UnloadedClassCount:0

TotalLoadedClassCount:431

---java.lang.management.MemoryMXBean---

HeapMemoryUsage:init = 0(0K) used = 458288(447K) committed = 2031616(1984K) max = 66650112(65088K)

NonHeapMemoryUsage:init = 29556736(28864K) used = 12541248(12247K) committed = 29851648(29152K) max = 121634816(118784K)

ObjectPendingFinalizationCount:0

---java.lang.management.MemoryManagerMXBean---

MemoryPoolNames:[Ljava.lang.String;@6ca1c

Name:CodeCacheManager

---java.lang.management.MemoryManagerMXBean---

MemoryPoolNames:[Ljava.lang.String;@1bf216a

Name:Copy

---java.lang.management.MemoryManagerMXBean---

MemoryPoolNames:[Ljava.lang.String;@12ac982

Name:MarkSweepCompact

---java.lang.management.MemoryPoolMXBean---

CollectionUsage:null

MemoryManagerNames:[Ljava.lang.String;@c20e24

PeakUsage:init = 196608(192K) used = 482048(470K) committed = 491520(480K) max = 33554432(32768K)

Usage:init = 196608(192K) used = 524352(512K) committed = 557056(544K) max = 33554432(32768K)

UsageThreshold:0

UsageThresholdCount:0

Name:Code Cache

Type:Non-heap memory

---java.lang.management.MemoryPoolMXBean---

CollectionUsage:init = 524288(512K) used = 0(0K) committed = 0(0K) max = 4194304(4096K)

CollectionUsageThreshold:0

CollectionUsageThresholdCount:0

MemoryManagerNames:[Ljava.lang.String;@2e7263

PeakUsage:init = 524288(512K) used = 511160(499K) committed = 524288(512K) max = 4194304(4096K)

Usage:init = 524288(512K) used = 521688(509K) committed = 524288(512K) max = 4194304(4096K)

Name:Eden Space

Type:Heap memory

---java.lang.management.MemoryPoolMXBean---

CollectionUsage:init = 65536(64K) used = 0(0K) committed = 0(0K) max = 458752(448K)

CollectionUsageThreshold:0

CollectionUsageThresholdCount:0

MemoryManagerNames:[Ljava.lang.String;@157f0dc

PeakUsage:init = 65536(64K) used = 65528(63K) committed = 65536(64K) max = 458752(448K)

Usage:init = 65536(64K) used = 65528(63K) committed = 65536(64K) max = 458752(448K)

Name:Survivor Space

Type:Heap memory

---java.lang.management.MemoryPoolMXBean---

CollectionUsage:init = 1441792(1408K) used = 0(0K) committed = 0(0K) max = 61997056(60544K)

CollectionUsageThreshold:0

CollectionUsageThresholdCount:0

MemoryManagerNames:[Ljava.lang.String;@863399

PeakUsage:init = 1441792(1408K) used = 142120(138K) committed = 1441792(1408K) max = 61997056(60544K)

Usage:init = 1441792(1408K) used = 142120(138K) committed = 1441792(1408K) max = 61997056(60544K)

UsageThreshold:0

UsageThresholdCount:0

Name:Tenured Gen

Type:Heap memory

---java.lang.management.MemoryPoolMXBean---

CollectionUsage:init = 8388608(8192K) used = 0(0K) committed = 0(0K) max = 67108864(65536K)

CollectionUsageThreshold:0

CollectionUsageThresholdCount:0

MemoryManagerNames:[Ljava.lang.String;@a59698

PeakUsage:init = 8388608(8192K) used = 641040(626K) committed = 8388608(8192K) max = 67108864(65536K)

Usage:init = 8388608(8192K) used = 641040(626K) committed = 8388608(8192K) max = 67108864(65536K)

UsageThreshold:0

UsageThresholdCount:0

Name:Perm Gen

Type:Non-heap memory

---java.lang.management.MemoryPoolMXBean---

CollectionUsage:init = 8388608(8192K) used = 0(0K) committed = 0(0K) max = 8388608(8192K)

CollectionUsageThreshold:0

CollectionUsageThresholdCount:0

MemoryManagerNames:[Ljava.lang.String;@141d683

PeakUsage:init = 8388608(8192K) used = 5601632(5470K) committed = 8388608(8192K) max = 8388608(8192K)

Usage:init = 8388608(8192K) used = 5601632(5470K) committed = 8388608(8192K) max = 8388608(8192K)

UsageThreshold:0

UsageThresholdCount:0

Name:Perm Gen [shared-ro]

Type:Non-heap memory

---java.lang.management.MemoryPoolMXBean---

CollectionUsage:init = 12582912(12288K) used = 0(0K) committed = 0(0K) max = 12582912(12288K)

CollectionUsageThreshold:0

CollectionUsageThresholdCount:0

MemoryManagerNames:[Ljava.lang.String;@16a55fa

PeakUsage:init = 12582912(12288K) used = 5850024(5712K) committed = 12582912(12288K) max = 12582912(12288K)

Usage:init = 12582912(12288K) used = 5850024(5712K) committed = 12582912(12288K) max = 12582912(12288K)

UsageThreshold:0

UsageThresholdCount:0

Name:Perm Gen [shared-rw]

Type:Non-heap memory