de.aristaflow.adept2.util

Class ObjectCounting<T>

java.lang.Object

de.aristaflow.adept2.util.ObjectCounting<T>

Type Parameters:

T - The type of the objects to count.

Direct Known Subclasses:

ObjectEqualityLockCount

public class ObjectCounting<T>
extends java.lang.Object

A class for counting objects thread-safe. This resembles an AtomicLong but object-specific.

Author:

Ulrich Kreher

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.logging.Logger	logger The logger for information on object counting.
protected java.util.Map<T,java.lang.Long>	objectCount The map managing the objects and their counts.

Constructor Summary

Constructors

Constructor and Description
ObjectCounting() Creates a new instance for object counting using a logger for this class (ObjectCounting, not a subclass).
ObjectCounting(java.util.logging.Logger logger) Creates a new instance for object counting using the designated logger.

Method Summary

Modifier and Type	Method and Description
long	decreaseAndGetCount(T object) Decreases and gets the count for the designated object.
long	getCount(T object) Returns the current count for the designated object.
long	increaseAndGetCount(T object) Increases and gets the count for the designated object.
boolean	isEmpty() Gets whether this object counting has at least one count for an arbitrary object.

Methods inherited from class java.lang.Object

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

Field Detail

objectCount

protected final java.util.Map<T,java.lang.Long> objectCount

The map managing the objects and their counts.

logger

protected final java.util.logging.Logger logger

The logger for information on object counting.

Constructor Detail

ObjectCounting

public ObjectCounting()

Creates a new instance for object counting using a logger for this class (ObjectCounting, not a subclass).

ObjectCounting

public ObjectCounting(java.util.logging.Logger logger)

Creates a new instance for object counting using the designated logger.

Parameters:

logger - The logger for information on object counting.

Method Detail

isEmpty

public boolean isEmpty()

Gets whether this object counting has at least one count for an arbitrary object.

Returns:

Whether this object counting has at least one count for an arbitrary object.

getCount

public long getCount(T object)

Returns the current count for the designated object.

Parameters:

object - The object for which to get the count.

Returns:

The count for the designated object or 0 in case the object has no count.

increaseAndGetCount

public long increaseAndGetCount(T object)

Increases and gets the count for the designated object.

Parameters:

object - The object for which to increase and get the count.

Returns:

The increased count for the designated object. This is at least 1.

decreaseAndGetCount

public long decreaseAndGetCount(T object)

Decreases and gets the count for the designated object.

Parameters:

object - The object for which to decrease and get the count.

Returns:

The decreased count for the designated object.