org.unlaxer.util.FactoryBoundCache Maven / Gradle / Ivy

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package org.unlaxer.util;

import java.util.Map;
import java.util.function.Function;

public class FactoryBoundCache{
	
	Map valueByKey= new NullSafetyConcurrentHashMap();
	
	Function factory;
	
	public FactoryBoundCache(Function factory) {
		super();
		this.factory = factory;
	}
	
	public synchronized V get(K key){
//		return valueByKey.computeIfAbsent(key, factory::apply);
		V v = valueByKey.get(key);
		if(v == null) {
			v = factory.apply(key);
			valueByKey.put(key, v);
		}
		return v;
	}
}