java-tutorials/libraries/src/main/java/com/baeldung/jcache/SimpleCacheLoader.java

package com.baeldung.jcache;

import java.util.HashMap;
import java.util.Map;

import javax.cache.integration.CacheLoader;
import javax.cache.integration.CacheLoaderException;

public class SimpleCacheLoader implements CacheLoader<Integer, String> {

    @Override
    public String load(Integer key) throws CacheLoaderException {
        return "fromCache" + key;
    }

    @Override
    public Map<Integer, String> loadAll(Iterable<? extends Integer> keys) throws CacheLoaderException {
        Map<Integer, String> data = new HashMap<>();
        for (int key : keys) {
            data.put(key, load(key));
        }
        return data;
    }
}