DefaultStats.java

package de.axone.cache.ng;

import java.util.Formatter;
import java.util.concurrent.atomic.AtomicLong;

public class DefaultStats implements CacheNG.AutomaticClient.Stats {

	private AtomicLong accesses = new AtomicLong(), hits = new AtomicLong();
	private CacheNG.AutomaticClient<?,?> cache;
	
	public DefaultStats( CacheNG.AutomaticClient<?,?> cache ){
		this.cache = cache;
	}
	
	@Override
	public void hit(){
		accesses.incrementAndGet();
		hits.incrementAndGet();
	}
	
	@Override
	public void miss(){
		accesses.incrementAndGet();
	}
	
	@Override
	public String toString(){
		
		StringBuilder result = new StringBuilder();
		
		try ( Formatter format = new Formatter( result ) ){
			
			long hits = this.hits.get();
			long accesses = this.accesses.get();
			
			format.format( "Ratio: %d/%d hits = %.1f%%",
					hits, accesses, 100.0*hits/accesses );
			
			if( cache.capacity() > 0 ){
				format.format( " | Full: %d/%d entries = %.1f%%",
						cache.size(), cache.capacity(), 100.0*cache.size()/cache.capacity() );
			}
			
			return result.toString();
		}
	}
}