| Blog信息 |
|
blog名称:
日志总数:1304
评论数量:2242
留言数量:5
访问次数:7598300
建立时间:2006年5月29日 |
| |
|
 [J2SE]J2SE5.0新特性之监控与管理
软件技术
lhwork 发表于 2006/7/14 16:49:56 |
| 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:x86AvailableProcessors:2Name:Windows 2000Version:5.0---java.lang.management.CompilationMXBean---TotalCompilationTime:5Name:HotSpot Client Compiler---java.lang.management.ClassLoadingMXBean---LoadedClassCount:431UnloadedClassCount:0TotalLoadedClassCount: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;@6ca1cName:CodeCacheManager---java.lang.management.MemoryManagerMXBean---MemoryPoolNames:[Ljava.lang.String;@1bf216aName:Copy---java.lang.management.MemoryManagerMXBean---MemoryPoolNames:[Ljava.lang.String;@12ac982Name:MarkSweepCompact---java.lang.management.MemoryPoolMXBean---CollectionUsage:nullMemoryManagerNames:[Ljava.lang.String;@c20e24PeakUsage: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:0UsageThresholdCount:0Name:Code CacheType:Non-heap memory---java.lang.management.MemoryPoolMXBean---CollectionUsage:init = 524288(512K) used = 0(0K) committed = 0(0K) max = 4194304(4096K)CollectionUsageThreshold:0CollectionUsageThresholdCount:0MemoryManagerNames:[Ljava.lang.String;@2e7263PeakUsage: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 SpaceType:Heap memory---java.lang.management.MemoryPoolMXBean---CollectionUsage:init = 65536(64K) used = 0(0K) committed = 0(0K) max = 458752(448K)CollectionUsageThreshold:0CollectionUsageThresholdCount:0MemoryManagerNames:[Ljava.lang.String;@157f0dcPeakUsage: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 SpaceType:Heap memory---java.lang.management.MemoryPoolMXBean---CollectionUsage:init = 1441792(1408K) used = 0(0K) committed = 0(0K) max = 61997056(60544K)CollectionUsageThreshold:0CollectionUsageThresholdCount:0MemoryManagerNames:[Ljava.lang.String;@863399PeakUsage: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:0UsageThresholdCount:0Name:Tenured GenType:Heap memory---java.lang.management.MemoryPoolMXBean---CollectionUsage:init = 8388608(8192K) used = 0(0K) committed = 0(0K) max = 67108864(65536K)CollectionUsageThreshold:0CollectionUsageThresholdCount:0MemoryManagerNames:[Ljava.lang.String;@a59698PeakUsage: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:0UsageThresholdCount:0Name:Perm GenType:Non-heap memory---java.lang.management.MemoryPoolMXBean---CollectionUsage:init = 8388608(8192K) used = 0(0K) committed = 0(0K) max = 8388608(8192K)CollectionUsageThreshold:0CollectionUsageThresholdCount:0MemoryManagerNames:[Ljava.lang.String;@141d683PeakUsage: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:0UsageThresholdCount:0Name: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:0CollectionUsageThresholdCount:0MemoryManagerNames:[Ljava.lang.String;@16a55faPeakUsage: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:0UsageThresholdCount:0Name:Perm Gen [shared-rw]Type:Non-heap memory |
|
|