@Configuration
public class CacheManagerConfig {
	@Bean("cacheManager")
	// List<Cache>會主動搜索Cache的實現(xiàn)bean，并添加到caches中
	public SimpleCacheManager cacheManager(List<Cache> caches){
		SimpleCacheManager simpleCacheManager = new SimpleCacheManager();
		simpleCacheManager.setCaches(caches);
		return simpleCacheManager;
	}
	@Bean("stockDetail")
	public ConcurrentMapCacheFactoryBean stockDetail(){
		ConcurrentMapCacheFactoryBean stockDetail = new ConcurrentMapCacheFactoryBean();
		// 如果用戶設置名稱為stockDetail的緩存，則需要添加這樣的一個bean
		stockDetail.setName("stockDetail");
		return stockDetail;
	}
	@Bean("detailMsg")
	public ConcurrentMapCacheFactoryBean detailMsg(){
		ConcurrentMapCacheFactoryBean stockDetail = new ConcurrentMapCacheFactoryBean();
		// 如果用戶設置名稱為detailMsg的緩存，則需要添加這樣的一個bean
		stockDetail.setName("detailMsg");
		return stockDetail;
	}
}

public interface CacheManager {
	@Nullable
	Cache getCache(String name);
	Collection<String> getCacheNames();
}

public class MyCacheManager implements CacheManager {
	private ConcurrentMap<String, Cache> caches = new ConcurrentHashMap<String, Cache>();
	public MyCacheManager(String name, Cache cache) {
		this.caches.put(name, cache);
	}
	@Override
	public Cache getCache(String name) {
        //更加緩存名字獲取緩存
		Cache cache = this.caches.get(name);
		if (cache != null) {
			return cache;
		} else {
            //如果指定的緩存名字沒有找到 則新建一個ConcurrentMapCache 并保存在cachemanager中
			ConcurrentMapCache newCache = new ConcurrentMapCache(name);
			caches.put(name, newCache);
			return newCache;
		}
	}
	@Override
	public Collection<String> getCacheNames() {
		return this.caches.keySet();
	}
}

<bean id="cacheManager" class="com.app.utils.cache.MyCacheManager">
		<constructor-arg value="userCache" /> <!-- 緩存名稱 -->
		<constructor-arg ref="mapCaffeCache" /> <!-- 緩存實現(xiàn)類 -->
	</bean>
	<!-- 自定義緩存實現(xiàn) -->
	<bean id="mapCaffeCache" class="com.app.utils.cache.MapCaffeCache"></bean>
	<!-- 自定義緩存key實現(xiàn) -->
	<bean id="cacheKeyGenerator"
		class="com.app.utils.cache.CacheKeyGenerator"></bean>
	<!-- 自定義spring啟動加載bean時加載緩存 -->
	<bean id="cacheBeanPostProcessor"
		class="com.app.CacheBeanPostProcessor"></bean>

@Cacheable(cacheManager = "cacheManager", key = "#i", value = "userCache", condition = "#i>7", unless = "#i>8")
public String getList(int i) {
	return "list server method :: "
		+ LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
}

public interface Cache {
	/**
	 * Return the cache name.
	 */
	String getName();
	/**
	 * Return the underlying native cache provider.
	 */
	Object getNativeCache();
	//獲取緩存的主要方法
	@Nullable
	ValueWrapper get(Object key);
	@Nullable
	<T> T get(Object key, @Nullable Class<T> type);
	@Nullable
	<T> T get(Object key, Callable<T> valueLoader);
	//添加緩存的主要方法
	void put(Object key, @Nullable Object value);
	@Nullable
	default ValueWrapper putIfAbsent(Object key, @Nullable Object value) {
		ValueWrapper existingValue = get(key);
		if (existingValue == null) {
			put(key, value);
		}
		return existingValue;
	}
	void evict(Object key);
	default boolean evictIfPresent(Object key) {
		evict(key);
		return false;
	}
	void clear();
	default boolean invalidate() {
		clear();
		return false;
	}
	@FunctionalInterface
	interface ValueWrapper {
		@Nullable
		Object get();
	}
	@SuppressWarnings("serial")
	class ValueRetrievalException extends RuntimeException {
		@Nullable
		private final Object key;
		public ValueRetrievalException(@Nullable Object key, Callable<?> loader, Throwable ex) {
			super(String.format("Value for key '%s' could not be loaded using '%s'", key, loader), ex);
			this.key = key;
		}
		@Nullable
		public Object getKey() {
			return this.key;
		}
	}
}

public class MapCaffeCache implements Cache {
//	private ConcurrentMapCache mapCache = new ConcurrentMapCache("mapCache");
	private com.github.benmanes.caffeine.cache.@NonNull Cache<Object, Object> mapCache = Caffeine.newBuilder()
			.expireAfterWrite(5, TimeUnit.SECONDS).expireAfterAccess(5, TimeUnit.SECONDS).maximumSize(5).build();
	private com.github.benmanes.caffeine.cache.@NonNull Cache<Object, Object> caffeCache = Caffeine.newBuilder()
			.expireAfterWrite(1, TimeUnit.MINUTES).expireAfterAccess(1, TimeUnit.MINUTES).maximumSize(100).build();
	@Autowired
	private StringRedisTemplate redisTemplate;
	private String name = "userCache";
	@Override
	public String getName() {
		return this.name;
	}
	@Override
	public Object getNativeCache() {
		return this;
	}
	@Override
	public ValueWrapper get(Object key) {
		@Nullable
		Object ob = mapCache.getIfPresent(key);
		// 如果一級緩存有數(shù)據(jù) 直接返回 不觸發(fā)二級緩存
		if (ob != null) {
			System.out.println(String.format("Cache L1 (CaffeineCache) :: %s = %s", key, ob));
			SimpleValueWrapper valueWrapper = new SimpleValueWrapper(ob);
			return valueWrapper;
		}
		Object obj = caffeCache.getIfPresent(key);
		if (obj != null) {
			SimpleValueWrapper valueWrapper2 = new SimpleValueWrapper(obj);
			System.out.println(String.format("Cache L2 (CaffeineCache) :: %s = %s", key, obj));
			// 如果二級緩存有數(shù)據(jù) 則更新到一級緩存
			mapCache.put(key, obj);
			return valueWrapper2;
		}
		return null;
	}
	@Override
	public <T> T get(Object key, Class<T> type) {
		return (T) get(key).get();
	}
	@Override
	public <T> T get(Object key, Callable<T> valueLoader) {
		return (T) get(key).get();
	}
	@Override
	public void put(Object key, Object value) {
		mapCache.put(key, value);
		caffeCache.put(key, value);
		//當nginx搭建集群時 用redis 訂閱/發(fā)布 功能同步各項目點的緩存一致性
		redisTemplate.convertAndSend("ch1", key + ":>" + value);
	}
	@Override
	public void evict(Object key) {
		mapCache.asMap().remove(key);
		caffeCache.asMap().remove(key);
	}
	@Override
	public void clear() {
		mapCache.asMap().clear();
		caffeCache.asMap().clear();
	}
}

@Cacheable(cacheManager = "cacheManager", key = "#i", value = "userCache", condition = "#i>7", unless = "#i>8")

public class CacheKeyGenerator implements KeyGenerator {
	@Override
	public Object generate(Object target, Method method, Object... params) {
		if (params.length == 0) {
			return "spring:cache:defaultKey";
		} else {
			return target.getClass().getSimpleName() + ":" + method.getName();
		}
	}
}