de.is24.util.monitoring

Class HistorizableList

java.lang.Object

de.is24.util.monitoring.HistorizableList

All Implemented Interfaces:

Reportable, Iterable<Historizable>

public class HistorizableList
extends Object
implements Reportable, Iterable<Historizable>

This list manages ordering and discarding of registered Historizables with the same name.

Author:

OSchmitz

Field Summary

Fields

Modifier and Type	Field and Description
private int	fMaxEntriesToKeep
private LinkedList<Historizable>	historizables
private static org.apache.log4j.Logger	LOGGER
private String	name
private static long	serialVersionUID

Constructor Summary

Constructors

Constructor and Description
HistorizableList(String name, int aMaxEntriesToKeep) This class is only constructed by InApplicationMonitor

Method Summary

Methods

Modifier and Type	Method and Description
void	accept(ReportVisitor aVisitor) Implements the visitor pattern to read this Counter
void	add(Historizable historizable) add a Historizable instance to this list and remove the oldest instance if necessary.
Historizable	get(int index) This method is thread-safe in combination with size().
int	getMaxEntriesToKeep()
String	getName()
Iterator<Historizable>	iterator()
int	size()

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

name

private String name

fMaxEntriesToKeep

private final int fMaxEntriesToKeep

historizables

private LinkedList<Historizable> historizables

LOGGER

private static final org.apache.log4j.Logger LOGGER

Constructor Detail

HistorizableList

HistorizableList(String name,
                int aMaxEntriesToKeep)

This class is only constructed by InApplicationMonitor

Parameters:

name - name of this Counter

Method Detail

accept

public void accept(ReportVisitor aVisitor)

Implements the visitor pattern to read this Counter

Specified by:

accept in interface Reportable

getName

public String getName()

Specified by:

getName in interface Reportable

Returns:

name of the managed Historizables

add

public void add(Historizable historizable)

add a Historizable instance to this list and remove the oldest instance if necessary.

Parameters:

historizable - the Historizable to add

iterator

public Iterator<Historizable> iterator()

Specified by:

iterator in interface Iterable<Historizable>

Returns:

an iterator over the Historizable entries. The iterator actually iterates over a clone of the internal list, to prevent concorrent modification problems.

getMaxEntriesToKeep

public int getMaxEntriesToKeep()

Returns:

the maximum number of entries that can be contained in this list.

size

public int size()

Returns:

the actual amount of contained Historizables.

get

public Historizable get(int index)

This method is thread-safe in combination with size(). The size returned is always the least available size.

Parameters:

index - the index of the Historizable to be returned. Can never be greater or equal than getMaxEntriesToKeep().

Returns:

the Historizable at the index position.

Throws:

IndexOutOfBoundsException - if the index argument is greater or equal the size of this list.