com.redhat.thermostat.vm.gc.agent.internal

Class VmGcDataExtractor

java.lang.Object

com.redhat.thermostat.vm.gc.agent.internal.VmGcDataExtractor

public class VmGcDataExtractor
extends Object

A helper class to provide type-safe access to commonly used jvmstat monitors

Implementation details: For local vms, jvmstat uses a ByteBuffer corresponding to mmap()ed hsperfdata file. The hsperfdata file is updated asynchronously by the vm that created the file. The polling that jvmstat api provides is merely an abstraction over this (possibly always up-to-date) ByteBuffer. So the data this class extracts is as current as possible, and does not correspond to when the jvmstat update events fired.

Constructor Summary

Constructors

Constructor and Description
VmGcDataExtractor(VmUpdate update)

Method Summary

Methods

Modifier and Type	Method and Description
long	getCollectorInvocations(long collector)
String	getCollectorName(long collector)
long	getCollectorTime(long collector)
long	getTotalCollectors()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

VmGcDataExtractor

public VmGcDataExtractor(VmUpdate update)

Method Detail

getTotalCollectors

public long getTotalCollectors()
                        throws VmUpdateException

Throws:

VmUpdateException

getCollectorName

public String getCollectorName(long collector)
                        throws VmUpdateException

Throws:

VmUpdateException

getCollectorTime

public long getCollectorTime(long collector)
                      throws VmUpdateException

Throws:

VmUpdateException

getCollectorInvocations

public long getCollectorInvocations(long collector)
                             throws VmUpdateException

Throws:

VmUpdateException