de.is24.util.monitoring
Class CorePlugin

java.lang.Object
  de.is24.util.monitoring.AbstractMonitorPlugin
      de.is24.util.monitoring.CorePlugin

All Implemented Interfaces:

MonitorPlugin

public class CorePlugin
extends AbstractMonitorPlugin

This plugin represents the former core functionality of InApplicationMonitor, on a way to a more flexible implementation by plugins, to simplify testing and the first step on the way fo a more dependency injection friendly implementation. This plugin will take over some functionality that only makes sense in the context of a plugin that stores data locally in the JVM. Other plugins (namely the statsd plugin) move data aggregation out of the JVM. And thus it makes no sense to let them implement some of the patterns like reportableObserver etc.

Field Summary

private Monitors<Counter>	countersTimers
private Monitors<HistorizableList>	historizableLists
private InApplicationMonitorJMXConnector	inApplicationMonitorJMXConnector
private KeyHandler	keyHandler
private static org.apache.log4j.Logger	LOGGER
private int	maxHistoryEntriesToKeep
protected boolean	monitorActive
private CopyOnWriteArrayList<ReportableObserver>	reportableObservers
private Monitors<StateValueProvider>	stateValues
private Monitors<Version>	versions

Constructor Summary

CorePlugin(JmxAppMon4JNamingStrategy jmxAppMon4JNamingStrategy, KeyHandler keyHandler)

Method Summary

void	addHighRateTimerMeasurement(String name, long timing) Add a timer measurement for a rarely occuring event with given name.
void	addHistorizable(String name, Historizable historizable) add a Historizable instance to the list identified by historizable.getName()
void	addReportableObserver(ReportableObserver reportableObserver) adds a new ReportableObserver that wants to be notified about new Reportables that are registered on the InApplicationMonitor
void	addSingleEventTimerMeasurement(String name, long timing) Add a timer measurement for a rarely occuring event with given name.
void	addTimerMeasurement(String name, long timing) Add a timer measurement for the given name.
void	afterRemovalNotification()
void	destroy()
(package private) Counter	getCounter(String name) internally used method to retrieve or create and register a named Counter.
(package private) HistorizableList	getHistorizableList(String name) internally used method to retrieve or create and register a named HistorizableList.
int	getMaxHistoryEntriesToKeep()
(package private) StateValueProvider	getStateValue(String name)
(package private) Timer	getTimer(String name) internaly used method to retrieve or create and register a named Timer.
String	getUniqueName()
void	incrementCounter(String name, int increment) Increase the specified counter by a variable amount.
void	incrementHighRateCounter(String name, int increment)
private void	incrementInternalCounter(int increment, String name)
void	initDefaultStateValues()
void	initializeCounter(String name) Initialization of a counter.
void	initializeTimerMeasurement(String name) Initialization of a TimerMeasurement
boolean	isJMXInitialized()
private void	notifyReportableObservers(Reportable reportable)
void	registerStateValue(StateValueProvider stateValueProvider) Add a state value provider to this appmon4j instance.
void	registerVersion(Version versionToAdd) This method was intended to register module names with their current version identifier.
void	removeReportableObserver(ReportableObserver reportableObserver) Allow disconnection of observers, mainly for testing
void	reportInto(ReportVisitor reportVisitor) Implements the InApplicationMonitor side of the Visitor pattern.
void	setMaxHistoryEntriesToKeep(int aMaxHistoryEntriesToKeep) Set the Number of entries to keep for each Historizable list.

Methods inherited from class de.is24.util.monitoring.AbstractMonitorPlugin

equals, hashCode, register

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

private static org.apache.log4j.Logger LOGGER

monitorActive

protected volatile boolean monitorActive

maxHistoryEntriesToKeep

private volatile int maxHistoryEntriesToKeep

reportableObservers

private final CopyOnWriteArrayList<ReportableObserver> reportableObservers

countersTimers

private final Monitors<Counter> countersTimers

stateValues

private final Monitors<StateValueProvider> stateValues

versions

private final Monitors<Version> versions

historizableLists

private final Monitors<HistorizableList> historizableLists

inApplicationMonitorJMXConnector

private InApplicationMonitorJMXConnector inApplicationMonitorJMXConnector

keyHandler

private KeyHandler keyHandler

Constructor Detail

CorePlugin

public CorePlugin(JmxAppMon4JNamingStrategy jmxAppMon4JNamingStrategy,
                  KeyHandler keyHandler)

Method Detail

initDefaultStateValues

public void initDefaultStateValues()

afterRemovalNotification

public void afterRemovalNotification()

destroy

public void destroy()

getUniqueName

public String getUniqueName()

isJMXInitialized

public boolean isJMXInitialized()

getMaxHistoryEntriesToKeep

public int getMaxHistoryEntriesToKeep()

Returns:

Number of entries to keep for each Historizable list.

setMaxHistoryEntriesToKeep

public void setMaxHistoryEntriesToKeep(int aMaxHistoryEntriesToKeep)

Set the Number of entries to keep for each Historizable list. Default is 5.

Parameters:

aMaxHistoryEntriesToKeep - Number of entries to keep

addReportableObserver

public void addReportableObserver(ReportableObserver reportableObserver)

adds a new ReportableObserver that wants to be notified about new Reportables that are registered on the InApplicationMonitor

Parameters:

reportableObserver - the class that wants to be notified

notifyReportableObservers

private void notifyReportableObservers(Reportable reportable)

removeReportableObserver

public void removeReportableObserver(ReportableObserver reportableObserver)

Allow disconnection of observers, mainly for testing

Parameters:

reportableObserver -

reportInto

public void reportInto(ReportVisitor reportVisitor)

Implements the InApplicationMonitor side of the Visitor pattern. Iterates through all registered Reportable instances and calls the corresponding method on the ReportVisitor implementation.

Parameters:

reportVisitor - The ReportVisitor instance that shall be visited by all regieteres Reportable instances.

incrementCounter

public void incrementCounter(String name,
                             int increment)

Increase the specified counter by a variable amount.

Parameters:

name - the name of the Counter to increase

increment - the added to add

incrementHighRateCounter

public void incrementHighRateCounter(String name,
                                     int increment)

incrementInternalCounter

private void incrementInternalCounter(int increment,
                                      String name)

initializeCounter

public void initializeCounter(String name)

Initialization of a counter.

Parameters:

name - the name of the counter to be initialized

addTimerMeasurement

public void addTimerMeasurement(String name,
                                long timing)

Add a timer measurement for the given name. Timers allow adding timer measurements, implicitly incrementing the count Timers count and measure timed events. The application decides which unit to use for timing. Miliseconds are suggested and some ReportVisitor implementations may imply this.

Parameters:

name - name of the Timer

timing - number of elapsed time units for a single measurement

addSingleEventTimerMeasurement

public void addSingleEventTimerMeasurement(String name,
                                           long timing)

Add a timer measurement for a rarely occuring event with given name. This allows Plugins to to react on the estimated rate of the event. Namely the statsd plugin will not sent these , as the requires storage is in no relation to the value of the data. Timers allow adding timer measurements, implicitly incrementing the count Timers count and measure timed events. The application decides which unit to use for timing. Miliseconds are suggested and some ReportVisitor implementations may imply this.

Parameters:

name - name of the Timer

timing - number of elapsed time units for a single measurement

addHighRateTimerMeasurement

public void addHighRateTimerMeasurement(String name,
                                        long timing)

Add a timer measurement for a rarely occuring event with given name. This allows Plugins to to react on the estimated rate of the event. Namely the statsd plugin will not sent these , as the requires storage is in no relation to the value of the data. Timers allow adding timer measurements, implicitly incrementing the count Timers count and measure timed events. The application decides which unit to use for timing. Miliseconds are suggested and some ReportVisitor implementations may imply this.

Parameters:

name - name of the Timer

timing - number of elapsed time units for a single measurement

initializeTimerMeasurement

public void initializeTimerMeasurement(String name)

Initialization of a TimerMeasurement

Parameters:

name - the name of the timer to be initialized

registerStateValue

public void registerStateValue(StateValueProvider stateValueProvider)

Add a state value provider to this appmon4j instance. StateValueProvider instances allow access to a numeric value (long), that is already available in the application.

Parameters:

stateValueProvider - the StateValueProvider instance to add

registerVersion

public void registerVersion(Version versionToAdd)

This method was intended to register module names with their current version identifier. This could / should actually be generalized into an non numeric state value

Parameters:

versionToAdd - The Version Object to add

addHistorizable

public void addHistorizable(String name,
                            Historizable historizable)

add a Historizable instance to the list identified by historizable.getName()

Parameters:

historizable - the historizable to add

getStateValue

StateValueProvider getStateValue(String name)

Parameters:

name - the name of the StatsValueProvider

Returns:

the StatsValueProvider

getCounter

Counter getCounter(String name)

internally used method to retrieve or create and register a named Counter.

Parameters:

name - of the required Counter

Returns:

Counter instance registered for the given name

getTimer

Timer getTimer(String name)

internaly used method to retrieve or create and register a named Timer.

Parameters:

name - of the required Timer

Returns:

Timer instance registered for the given name

getHistorizableList

HistorizableList getHistorizableList(String name)

internally used method to retrieve or create and register a named HistorizableList.

Parameters:

name - of the required HistorizableList

Returns:

HistorizableList instance registered for the given name