CaffeineBasedLoadBalancerCacheManager.java

/*
 * Copyright 2012-present the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.cloud.loadbalancer.cache;

import com.github.benmanes.caffeine.cache.Caffeine;

import org.springframework.cache.caffeine.CaffeineCacheManager;
import org.springframework.util.StringUtils;

import static org.springframework.cloud.loadbalancer.core.CachingServiceInstanceListSupplier.SERVICE_INSTANCE_CACHE_NAME;

/**
 * A Spring Cloud LoadBalancer specific implementation of {@link CaffeineCacheManager}
 * that implements the {@link LoadBalancerCacheManager} marker interface.
 *
 * @author Olga Maciaszek-Sharma
 * @since 2.2.0
 * @see <a href="https://github.com/ben-manes/caffeine>Caffeine</a>
 * @see CaffeineCacheManager
 * @see Caffeine
 */
public class CaffeineBasedLoadBalancerCacheManager extends CaffeineCacheManager implements LoadBalancerCacheManager {

	public CaffeineBasedLoadBalancerCacheManager(String cacheName, LoadBalancerCacheProperties properties) {
		super(cacheName);
		if (StringUtils.hasText(properties.getCaffeine().getSpec())) {
			setCacheSpecification(properties.getCaffeine().getSpec());
		}
		else {
			setCaffeine(Caffeine.newBuilder()
				.initialCapacity(properties.getCapacity())
				.expireAfterWrite(properties.getTtl())
				.softValues());
		}

	}

	public CaffeineBasedLoadBalancerCacheManager(LoadBalancerCacheProperties properties) {
		this(SERVICE_INSTANCE_CACHE_NAME, properties);
	}

}