本文主要是介绍使用SpringAOP+Caffeine实现本地缓存，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
一、背景
公司想对一些不经常变动的数据做一些本地缓存，我们使用AOP+Caffeine来实现
二、实现
1、定义注解
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;/*** 本地缓存*/
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface LocalCacheable {// 过期时间 默认10分钟long expired() default 600;// key创建器String keyGenerator() default "org.springframework.cache.interceptor.KeyGenerator";
}
2、切面
import com.google.gson.internal.LinkedTreeMap;
import org.apache.commons.lang3.ArrayUtils;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.aop.framework.AopProxyUtils;
import org.springframework.aop.support.AopUtils;
import org.springframework.cglib.proxy.Enhancer;
import org.springframework.stereotype.Component;import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.List;
import java.util.Map;/*** 本地缓存*/
@Aspect
@Component
public class LocalCacheAspect {private static final String separator = ":";@Around("@annotation(com.framework.localcache.LocalCacheable)")public Object around(ProceedingJoinPoint point) throws Throwable {if (AopUtils.isAopProxy(point.getTarget())) {return point.proceed();}Method method = getMethodSignature(point).getMethod();if (method == null) {return point.proceed();}LocalCacheable annotation = method.getAnnotation(LocalCacheable.class);if (annotation == null) {return point.proceed();}// 生成keyString key = generateKey(point);
// System.out.println("生成的key:" + key);long expired = annotation.expired();Throwable[] throwable = new Throwable[1];Object proceed = LocalCache.cacheData(key, () -> {try {return point.proceed();} catch (Throwable e) {throwable[0] = e;}return null;}, expired);if (throwable[0] != null) {throw throwable[0];}return proceed;}/*** 获取方法*/private MethodSignature getMethodSignature(ProceedingJoinPoint point) {Signature signature = point.getSignature();if (signature instanceof MethodSignature) {return ((MethodSignature) signature);}return null;}/*** 获取key*/private String generateKey(ProceedingJoinPoint point) {// 目标类、方法、参数等Class<?> targetClass = AopProxyUtils.ultimateTargetClass(point.getTarget());Method method = getMethodSignature(point).getMethod();String[] parameterNames = getMethodSignature(point).getParameterNames();Object[] args = point.getArgs();// 解析参数，生成keyLinkedTreeMap<String, Object> paramResolveResult = new LinkedTreeMap<>();if (ArrayUtils.isNotEmpty(args)) {for (int i = 0; i < args.length; i++) {resolveParam(args[i], paramResolveResult, parameterNames[i]);}}StringBuilder key = new StringBuilder(targetClass.getName() + separator + method.getName() + separator);paramResolveResult.forEach((k, v) -> {if (v != null) {key.append(k + "," + v + separator);}});// 根据方法名和参数生成唯一标识return key.toString();}private void resolveParam(Object param, Map<String, Object> paramResolveResult, String prefix) {if (param == null) {return;}Class<?> type = param.getClass();if (type == List.class) {List<Object> param0 = (List) param;for (int i = 0; i < param0.size(); i++) {resolveParam(param0.get(i), paramResolveResult, prefix + "[" + i + "]");}} else if (type == Map.class) {Map<Object, Object> param0 = (Map) param;param0.forEach((k, v) -> {resolveParam(v, paramResolveResult, prefix + "." + k);});} else if (type.isArray()) {Object[] param0 = (Object[]) param;for (int i = 0; i < param0.length; i++) {resolveParam(param0[i], paramResolveResult, prefix + "[" + i + "]");}} else if (type == Byte.class|| type == Short.class|| type == Integer.class|| type == Long.class|| type == Float.class|| type == Double.class|| type == Boolean.class|| type == Character.class|| type == String.class) {paramResolveResult.put(prefix, param);} else if (type.getName().startsWith("java.")) {} else {// 复杂类型Map<String, Object> fieldMap = new HashMap<>();// CGLIB代理if (Enhancer.isEnhanced(type)) {getAllFieldsAndValue(param, type.getSuperclass(), fieldMap);} else {getAllFieldsAndValue(param, type, fieldMap);}fieldMap.forEach((k, v) -> {if (v == null) {return;}resolveParam(v, paramResolveResult, prefix + "." + k);});}}/*** 获取所有字段和值*/private void getAllFieldsAndValue(Object o, Class type, Map<String, Object> fieldMap) {for (Method method : type.getMethods()) {if (method.getName().startsWith("get") && method.getParameterCount() == 0) {try {Object value = method.invoke(o);if (value != null) {fieldMap.put(method.getName().substring(3), value);}} catch (Exception e) {}}}}}
3、缓存工具类
import com.github.benmanes.caffeine.cache.Cache;
import com.github.benmanes.caffeine.cache.CacheLoader;
import com.github.benmanes.caffeine.cache.Caffeine;
import org.springframework.stereotype.Component;
import org.springframework.util.Assert;import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;/*** 本地缓存*/
public class LocalCache {private static final Map<Long, Cache<Object, Object>> cacheMap = new ConcurrentHashMap<>();/*** 创建本地缓存* @param seconds 过期时间：秒*/private static Cache<Object, Object> createCache(long seconds) {return Caffeine.newBuilder().expireAfterWrite(seconds, TimeUnit.SECONDS).build();}/*** 创建本地缓存* @param seconds 过期时间：秒* @param loader 缓存方法*/private Cache<Object, Object> createLoadingCache(long seconds, CacheLoader<Object, Object> loader) {return Caffeine.newBuilder().expireAfterWrite(seconds, TimeUnit.SECONDS).build(loader);}/*** 获取一个缓存组* @param seconds 缓存过期时间*/private static Cache<Object, Object> getAndLoad(long seconds) {if (cacheMap.containsKey(seconds)) {return cacheMap.get(seconds);}Cache<Object, Object> cache = createCache(seconds);cacheMap.put(seconds, cache);return cache;}/*** 缓存数据，过期时间默认10分钟* @param key key* @param supplier 数据来源的方法*/public static Object cacheData(Object key, Supplier<Object> supplier) {return cacheData(key, supplier, 600);}/*** 缓存数据* @param key key* @param supplier 数据来源的方法* @param seconds 过期时间：秒*/public static Object cacheData(Object key, Supplier<Object> supplier, long seconds) {Assert.state(seconds > 0, "过期时间必须大于0秒");Cache<Object, Object> cache = getAndLoad(seconds);return cache.get(key, k -> supplier.get());}
}三、测试
@LocalCacheable@GetMapping("test1")public String test1() {System.out.println("执行了");return "success";}@LocalCacheable@GetMapping("test2")public String test2(String a) {System.out.println("执行了" + a);return "success";}@LocalCacheable@GetMapping("test3")public String test3(String a, int b, String c) {System.out.println("执行了" + a + b + c);return "success";}@LocalCacheable@GetMapping("test4")public String test4(UserInfo user) {System.out.println("执行了" + user);return "success";}@LocalCacheable@GetMapping("test5")public String test5(UserInfo[] users) {System.out.println("执行了" + users);return "success";}@LocalCacheable@GetMapping("test6")public String test6(List<UserInfo> users) {System.out.println("执行了" + users);return "success";}@LocalCacheable@GetMapping("test7")public String test7(UserInfo user) {System.out.println("执行了" + user.getMap());return "success";}
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