org.pentaho.caching.ri.impl.GuavaCacheManager.java Source code

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/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2015 by Pentaho : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * 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 org.pentaho.caching.ri.impl;

import com.google.common.cache.CacheBuilder;
import org.pentaho.caching.spi.AbstractCacheManager;
import org.pentaho.caching.api.Constants;

import javax.cache.Cache;
import javax.cache.CacheManager;
import javax.cache.configuration.CompleteConfiguration;
import javax.cache.configuration.Configuration;
import javax.cache.expiry.Duration;
import javax.cache.expiry.ExpiryPolicy;

/**
 * @author nhudak
 */
public class GuavaCacheManager extends AbstractCacheManager {

    @Override
    public <K, V, C extends Configuration<K, V>> Cache<K, V> newCache(final String cacheName,
            final C configuration) {
        CacheBuilder<Object, Object> cacheBuilder = CacheBuilder.newBuilder();

        if (configuration instanceof CompleteConfiguration) {
            configureCacheBuilder((CompleteConfiguration) configuration, cacheBuilder);
        }

        return new WrappedCache<K, V>(cacheBuilder.<K, V>build()) {
            @Override
            public String getName() {
                return cacheName;
            }

            @Override
            public CacheManager getCacheManager() {
                return GuavaCacheManager.this;
            }

            @Override
            public void close() {
                if (!isClosed()) {
                    super.close();
                    destroyCache(cacheName);
                }
            }

            @Override
            public <T extends Configuration<K, V>> T getConfiguration(Class<T> clazz) {
                return Constants.unwrap(configuration, clazz);
            }
        };
    }

    <K, V> void configureCacheBuilder(CompleteConfiguration<K, V> completeConfiguration,
            CacheBuilder<Object, Object> cacheBuilder) {
        ExpiryPolicy expiryPolicy = completeConfiguration.getExpiryPolicyFactory().create();

        Duration expiryForAccess = expiryPolicy.getExpiryForAccess();
        if (expiryForAccess != null && !expiryForAccess.isEternal()) {
            cacheBuilder.expireAfterAccess(expiryForAccess.getDurationAmount(), expiryForAccess.getTimeUnit());
        }
        Duration expiryForUpdate = expiryPolicy.getExpiryForUpdate();
        if (expiryForUpdate != null && !expiryForUpdate.isEternal()) {
            cacheBuilder.expireAfterWrite(expiryForUpdate.getDurationAmount(), expiryForUpdate.getTimeUnit());
        }
    }
}