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• 1.1.16
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• FactoryBoundCache.java

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com.daredayo.util.collection.FactoryBoundCache Maven / Gradle / Ivy

package com.daredayo.util.collection;

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

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