Spring cache 使用说明

package org.cheng.user.client.service;

import java.util.HashMap;
import java.util.Map;

import org.cheng.user.client.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CacheConfig;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

/**
 * 统一命名缓存 名称
 * @author Cheng
 */
@CacheConfig(cacheNames = { "user" })
@Service
public class UserService {
    
    @Autowired
    private CacheManager cacheManager;
    
    /**
     * 单个命名缓存名称
     * sync 默认为false 为true 需要同步等待
     * @param id
     * @return
     */
    @Cacheable(cacheNames = "user", key = "#id",sync = false)
    public User get(Integer id) {
        System.out.println("--get---");
        User user = new User();
        user.setId(id);
        return user;
    }

    /**
     * 按key存储
     * 前置存储条件 condition 为true 存储
     * 后置执行条件 unless  为false 存储
     * 
     * @param user
     * @return
     */
    @CachePut(key = "#user.id", condition = "#user.id<10000", unless = "#result.name.length() < 3")
    public User save(User user) {
        user.setName("name - " + user.getId());
        return user;
    }

    /**
     * 按key删除
     * 
     * @param id
     * @return
     */
    @CacheEvict(key = "#id")
    public String del(Integer id) {
        System.out.println("--del---");
        return String.valueOf(id);
    }

    /**
     * 清除全部
     */
    @CacheEvict(allEntries = true)
    public void removeAll() {
    }
    
    /**
     * 返回所有的缓存信息
     * @return
     */
    public Map<String,Cache> cache() {
        Map<String,Cache> map = new HashMap<>();
        for(String name:cacheManager.getCacheNames()) {
            map.put(name, cacheManager.getCache(name));
        }
        return map;
    }

}

参考文献：

https://docs.spring.io/spring/docs/5.1.6.RELEASE/spring-framework-reference/integration.html#cache

https://www.cnblogs.com/OnlyCT/p/7845660.html#t4