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Java Source Code / Java Documentation » 6.0 JDK Core » lang » java.lang.management 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.management.GarbageCollectorMXBean

GarbageCollectorMXBean
public interface GarbageCollectorMXBean extends MemoryManagerMXBean(Code)
The management interface for the garbage collection of the Java virtual machine. Garbage collection is the process that the Java virtual machine uses to find and reclaim unreachable objects to free up memory space. A garbage collector is one type of MemoryManagerMXBean memory manager .

A Java virtual machine may have one or more instances of the implementation class of this interface. An instance implementing this interface is an MXBean that can be obtained by calling the ManagementFactory.getGarbageCollectorMXBeans method or from the ManagementFactory.getPlatformMBeanServerplatform MBeanServer method.

The ObjectName for uniquely identifying the MXBean for a garbage collector within an MBeanServer is:

ManagementFactory.GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPEjava.lang:type=GarbageCollector ,name=collector's name
A platform usually includes additional platform-dependent information specific to a garbage collection algorithm for monitoring.
See Also:   MemoryMXBean
See Also:    * JMX Specification.
See Also:    * Ways to Access MXBeans
author:
   Mandy Chung
version:
   1.16, 05/05/07
since:
   1.5




Method Summary
public  longgetCollectionCount()
     Returns the total number of collections that have occurred.
public  longgetCollectionTime()
     Returns the approximate accumulated collection elapsed time in milliseconds.



Method Detail
getCollectionCount
public long getCollectionCount()(Code)
Returns the total number of collections that have occurred. This method returns -1 if the collection count is undefined for this collector. the total number of collections that have occurred.



getCollectionTime
public long getCollectionTime()(Code)
Returns the approximate accumulated collection elapsed time in milliseconds. This method returns -1 if the collection elapsed time is undefined for this collector.

The Java virtual machine implementation may use a high resolution timer to measure the elapsed time. This method may return the same value even if the collection count has been incremented if the collection elapsed time is very short. the approximate accumulated collection elapsed time in milliseconds.




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