de.fhws.applab.restserverspi.localcache.AbstractLocalCache.java Source code

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Here is the source code for de.fhws.applab.restserverspi.localcache.AbstractLocalCache.java

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/*
 * Copyright (c) peter.braun@fhws.de
 *
 *  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 de.fhws.applab.restserverspi.localcache;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import de.fhws.applab.restserverspi.models.AbstractModel;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;

/**
 * Created by braunpet on 19.06.15.
 */
public class AbstractLocalCache<T extends AbstractModel> {
    private Cache<Long, T> cache;

    public AbstractLocalCache(long maxCacheSize) {
        this.cache = CacheBuilder.newBuilder().maximumSize(maxCacheSize).build();
    }

    protected final T getFromCache(Long id, Callable<T> loadModel) {
        try {
            return this.cache.get(id, loadModel);
        } catch (ExecutionException e) {
            // Ignore
            return null;
        }
    }

    protected final void putToCache(Long id, T object) {
        this.cache.put(id, object);
    }

    protected final void removeFromCache(Long id) {
        this.cache.invalidate(id);
    }
}