Guava - 一个依托于 Guava cache 的工具类

Guava - 一个依托于 Guava cache 的工具类

1、代码

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.RemovalListener;
import lombok.NoArgsConstructor;
import lombok.SneakyThrows;import java.util.Optional;
import java.util.concurrent.TimeUnit;/*** @author Created by 谭健 on 2020/7/30. 星期四. 10:17.* ? All Rights Reserved.*/
@NoArgsConstructor
@SuppressWarnings("all")
public class GuavaCacheUtils {/*** 缓存中最大存储对象是数*/public static final int MAX = 20;/*** 创建一个临时缓存块** @param k key* @param v value* @param duration 过期时间* @param unit 时间单位* @param listener key 被移除的监听器*/@SneakyThrowspublic static <K, V> Cache<K, V> buildTempCache(K k, V v, long duration, TimeUnit unit, RemovalListener<? super K, ? super V> listener) {CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder();builder.maximumSize(MAX);Optional.ofNullable(listener).ifPresent(builder::removalListener);if (CommonUtils.isNotZeroLong(duration)) {builder.expireAfterWrite(duration, unit);}Cache<K, V> cache = builder.build();cache.put(k, v);return cache;}public static <K, V> Cache<K, V> buildTempCache(K k, V v, long duration, TimeUnit unit) {return buildTempCache(k, v, duration, unit, null);}public static <K, V> Cache<K, V> buildTempCache(K k, V v) {return buildTempCache(k, v, 1, TimeUnit.MINUTES, null);}}