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
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
a managed bean (MBean) conforming to the JMX Instrumentation
Specification. The MBeans can be obtained by calling
the ManagementFactory.getGarbageCollectorMBeans() method.
An application can monitor the instrumentation of the
garbage collection and manage certain characteristics in
any of the following ways:
MBeanServer.MBean proxy and call the methods of the MBean proxy.The ManagementFactory.getPlatformMBeanServer() method returns
the platform MBeanServer registered with all platform MBeans.
The ObjectName for uniquely identifying the MBean for a garbage collector within an MBeanServer is:
java.lang:type=GarbageCollector,name=collector's name
A platform usually includes additional platform-dependent information
specific to a garbage collection algorithm for monitoring.
MemoryMBean,
Ways to Access Management Metrics| Method Summary | |
|---|---|
long |
getCollectionCount()
Returns the total number of collections that have occurred. |
long |
getCollectionTime()
Returns the approximate accumulated collection elapsed time in milliseconds. |
| Methods inherited from interface java.lang.management.MemoryManagerMBean |
|---|
getMemoryPoolNames, getName, isValid |
| Method Detail |
|---|
long getCollectionCount()
long getCollectionTime()
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.