/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.elasticsearch.ingest.geoip;

import com.fasterxml.jackson.databind.JsonNode;
import com.maxmind.db.NodeCache;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.cache.Cache;
import org.elasticsearch.common.cache.CacheBuilder;

import java.io.IOException;
import java.util.concurrent.ExecutionException;

final class GeoIpCache implements NodeCache {
    private final Cache<Integer, JsonNode> cache;

    GeoIpCache(long maxSize) {
        this.cache = CacheBuilder.<Integer, JsonNode>builder().setMaximumWeight(maxSize).build();
    }

    @Override
    public JsonNode get(int key, Loader loader) throws IOException {
        try {
            return cache.computeIfAbsent(key, loader::load);
        } catch (ExecutionException e) {
            Throwable cause = e.getCause() != null ? e.getCause() : e;
            throw new ElasticsearchException(cause);
        }
    }
}
