com.redhat.thermostat.vm.memory.agent.internal

Class VmMemoryDataExtractor

java.lang.Object

com.redhat.thermostat.vm.memory.agent.internal.VmMemoryDataExtractor

public class VmMemoryDataExtractor
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
VmMemoryDataExtractor(VmUpdate update)

Method Summary

Methods

Modifier and Type	Method and Description
long	getGenerationCapacity(long generation)
String	getGenerationCollector(long generation)
long	getGenerationMaxCapacity(long generation)
String	getGenerationName(long generation)
long	getSpaceCapacity(long generation, long space)
long	getSpaceMaxCapacity(long generation, long space)
String	getSpaceName(long generation, long space)
long	getSpaceUsed(long generation, long space)
long	getTotalGcGenerations()
long	getTotalSpaces(long generation)

Methods inherited from class java.lang.Object

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

Constructor Detail

VmMemoryDataExtractor

public VmMemoryDataExtractor(VmUpdate update)

Method Detail

getTotalGcGenerations

public long getTotalGcGenerations()
                           throws VmUpdateException

Throws:

VmUpdateException

getGenerationName

public String getGenerationName(long generation)
                         throws VmUpdateException

Throws:

VmUpdateException

getGenerationCapacity

public long getGenerationCapacity(long generation)
                           throws VmUpdateException

Throws:

VmUpdateException

getGenerationMaxCapacity

public long getGenerationMaxCapacity(long generation)
                              throws VmUpdateException

Throws:

VmUpdateException

getGenerationCollector

public String getGenerationCollector(long generation)
                              throws VmUpdateException

Throws:

VmUpdateException

getTotalSpaces

public long getTotalSpaces(long generation)
                    throws VmUpdateException

Throws:

VmUpdateException

getSpaceName

public String getSpaceName(long generation,
                  long space)
                    throws VmUpdateException

Throws:

VmUpdateException

getSpaceCapacity

public long getSpaceCapacity(long generation,
                    long space)
                      throws VmUpdateException

Throws:

VmUpdateException

getSpaceMaxCapacity

public long getSpaceMaxCapacity(long generation,
                       long space)
                         throws VmUpdateException

Throws:

VmUpdateException

getSpaceUsed

public long getSpaceUsed(long generation,
                long space)
                  throws VmUpdateException

Throws:

VmUpdateException