com.redhat.thermostat.backend

Interface VmUpdate

All Known Implementing Classes:

VmUpdateImpl

public interface VmUpdate

This interface can be used to query the performance counters of a monitored JVM when they are updated.

See Also:

VmUpdateListener.countersUpdated(VmUpdate)

Method Summary

Methods

Modifier and Type	Method and Description
Long	getPerformanceCounterLong(String name) Queries the specified JVM performance counter with a Long data type.
String	getPerformanceCounterString(String name) Queries the specified JVM performance counter with a String data type.

Method Detail

getPerformanceCounterLong

Long getPerformanceCounterLong(String name)
                               throws VmUpdateException

Queries the specified JVM performance counter with a Long data type.

Parameters:

name - - The name of the performance counter

Returns:

The current value of the requested counter, or null if no such counter exists

Throws:

VmUpdateException - if there is a problem communicating with the JVM

ClassCastException - if the value of the counter is not a Long

getPerformanceCounterString

String getPerformanceCounterString(String name)
                                   throws VmUpdateException

Queries the specified JVM performance counter with a String data type.

Parameters:

name - - The name of the performance counter

Returns:

The current value of the requested counter, or null if no such counter exists

Throws:

VmUpdateException - if there is a problem communicating with the JVM

ClassCastException - if the value of the counter is not a String