CacheLoaderSync.java

/**
 * Copyright 2016 Hortonworks.
 *
 * Licensed 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 com.hortonworks.registries.cache.view.io.loader;

import com.hortonworks.registries.cache.Cache;
import com.hortonworks.registries.cache.view.datastore.DataStoreReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Collection;
import java.util.Map;

public class CacheLoaderSync<K,V> extends CacheLoader<K,V> {
    protected static final Logger LOG = LoggerFactory.getLogger(CacheLoaderSync.class);

    public CacheLoaderSync(Cache<K, V> cache, DataStoreReader<K,V> dataStoreReader) {
        super(cache, dataStoreReader);
    }

    public void loadAll(Collection<? extends K> keys, CacheLoaderCallback<K,V> callback) {
        Map<K, V> entries;
        try {
            entries = dataStoreReader.readAll(keys);
            cache.putAll(entries);
            callback.onCacheLoaded(entries);
        } catch (Exception e) {
            handleException(keys, callback, e, LOG);
        }
    }
}