services.moleculer.monitor

Class Monitor

java.lang.Object

services.moleculer.monitor.Monitor

Direct Known Subclasses:

CommandMonitor, ConstantMonitor, JmxMonitor, SigarMonitor

public abstract class Monitor
extends java.lang.Object

Base superclass of all System Monitor implementations.

See Also:

SigarMonitor, JmxMonitor

Field Summary

Fields

Modifier and Type	Field and Description
protected static int	cachedCPU Cached CPU usage
protected static java.util.concurrent.atomic.AtomicLong	cachedPID Cached process ID
protected long	cacheTimeout CPU cache timeout in MILLISECONDS
protected static long	cpuDetectedAt Timestamp of CPU detection
protected static java.util.concurrent.atomic.AtomicBoolean	invalidMonitor
protected org.slf4j.Logger	logger

Constructor Summary

Constructors

Constructor and Description
Monitor()

Method Summary

Modifier and Type	Method and Description
protected abstract long	detectPID() Returns the system CPU usage, in percents, between 0 and 100.
protected abstract int	detectTotalCpuPercent() Returns the system CPU usage, in percents, between 0 and 100.
long	getPID() Returns the cached PID of Java VM.
int	getTotalCpuPercent() Returns the cached system CPU usage, in percents, between 0 and 100.

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected final org.slf4j.Logger logger

cacheTimeout

protected long cacheTimeout

CPU cache timeout in MILLISECONDS

cachedPID

protected static java.util.concurrent.atomic.AtomicLong cachedPID

Cached process ID

cachedCPU

protected static int cachedCPU

Cached CPU usage

cpuDetectedAt

protected static long cpuDetectedAt

Timestamp of CPU detection

invalidMonitor

protected static final java.util.concurrent.atomic.AtomicBoolean invalidMonitor

Constructor Detail

Monitor

public Monitor()

Method Detail

getTotalCpuPercent

public int getTotalCpuPercent()

Returns the cached system CPU usage, in percents, between 0 and 100.

Returns:

total CPU usage of the current OS

getPID

public long getPID()

Returns the cached PID of Java VM.

Returns:

current Java VM's process ID

detectTotalCpuPercent

protected abstract int detectTotalCpuPercent()
                                      throws java.lang.Exception

Returns the system CPU usage, in percents, between 0 and 100.

Returns:

total CPU usage of the current OS

Throws:

java.lang.Exception - any I/O or missing DLL exception

detectPID

protected abstract long detectPID()
                           throws java.lang.Exception

Returns the system CPU usage, in percents, between 0 and 100.

Returns:

total CPU usage of the current OS

Throws:

java.lang.Exception - any I/O or missing DLL exception