net.i2p.util

Class ObjectCounter<K>

java.lang.Object

net.i2p.util.ObjectCounter<K>

Type Parameters:

K - type of objects being counted

All Implemented Interfaces:

Serializable

public class ObjectCounter<K>
extends Object
implements Serializable

Thread-safe counter for tracking occurrences of objects.

This class provides a concurrent way to count how many times specific objects appear. It uses ConcurrentHashMap and AtomicInteger to ensure thread-safe operations in multi-threaded environments.

Typical use cases include:

• Counting message frequencies
• Tracking request rates by client
• Monitoring event occurrences
• Statistical data collection

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ObjectCounter()
ObjectCounter(int maxSize)

Method Summary

Modifier and Type	Method and Description
void	clear() Start over.
void	clear(K h) Reset the count for this key to zero
int	count(K h)
int	increment(K h) Add one.
void	max(K h) Set a high value
Set<K>	objects()

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectCounter

public ObjectCounter()

ObjectCounter

public ObjectCounter(int maxSize)

Parameters:

maxSize - Maximum number of entries before oldest are evicted

Method Detail

clear

public void clear()

Start over. Reset the count for all keys to zero.

clear

public void clear(K h)

Reset the count for this key to zero

count

public int count(K h)

Returns:

current count

increment

public int increment(K h)

Add one.

Returns:

count after increment

max

public void max(K h)

Set a high value

objects

public Set<K> objects()

Returns:

set of objects with counts > 0