1.首先自定义注解 ：添加缓存
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
public @interface Memcached {
// key的前缀 default=STATIC的可以使用OMS清理缓存
String prefix() default "STATIC_";
// key
String key() default "";
// 过滤
String conditions() default "true";
// 緩存分組
String group() default "hos-portal-mclient1";
// 缓存有效期 2天 单位s
int expiration() default 60 * 60 * 48;
}
2.切面类
@Aspect
public class MemCachedAop {
private static final Logger log = LoggerFactory.getLogger(MemCachedAop.class);
@Value("${enable.static.cache}")
private boolean enableCache;
@Pointcut("execution(* com.ylzinfo.hospital.portal.service.appservice.*.*.*(..))")
protected void appservicePointcut(){}
@Autowired
private ICacheClient cacheClient;
/**
* 写入或者读取缓存
* 仅针对有注解的且该包下的方法
*/
@Around("(@annotation(memcached) && appservicePointcut())")
public Object doMemcachedAround(ProceedingJoinPoint call, Memcached memcached) throws Throwable {
String packageName = call.getSignature().getDeclaringTypeName();
String methodName = call.getSignature().getName();
log.info("执行方法: {} -> {}", packageName, methodName);
//返回最终结果
Object result = null;
//校验conditions
if (null != memcached
&& checkConditions(call,memcached.conditions())
&& enableCache) {
String key = resolvingKey(call,memcached.prefix(),memcached.key());
String group = memcached.group();
result = cacheClient.get(group, key);
if (null == result) {
// memcached中不存在
try {
//执行aop拦截的方法
result = call.proceed();
//获取注解配置memcached过期时间
int expiration = memcached.expiration();
cacheClient.put(group, key, result, expiration);
log.info("\n【写入Memcached缓存】" +
"\ngroup={}" +
"\nkey={}" +
"\nvalue={}" +
"\nexpiration={}",group,key, JSON.toJSON(result),expiration);
} catch (Throwable e) {
log.error("执行方法失败: {} -> {}", packageName, methodName);
log.error("失败原因:{}",e.getMessage());
}
}else{
// memcached中存在 直接返回
log.info("\n【读取Memcached缓存】" +
"\ngroup={}" +
"\nkey={}" +
"\nvalue={}",group,key,JSON.toJSON(result));
}
}else {
try {
result = call.proceed();
} catch (Throwable e) {
log.error("执行方法失败: {} -> {}", packageName, methodName);
log.error("失败原因:{}",e.getMessage());
}
}
return result;
}
/**
* 获取缓存的key
* key 定义在注解上，支持SPEL表达式
* @param key
* @param method
* @param args
* @return
*/
private String parseKey(String key, Method method, Object [] args){
//获取被拦截方法参数名列表(使用Spring支持类库)
LocalVariableTableParameterNameDiscoverer u =
new LocalVariableTableParameterNameDiscoverer();
String [] paraNameArr=u.getParameterNames(method);
//使用SPEL进行key的解析
ExpressionParser parser = new SpelExpressionParser();
//SPEL上下文
StandardEvaluationContext context = new StandardEvaluationContext();
//把方法参数放入SPEL上下文中
for(int i=0;i<paraNameArr.length;i++){
context.setVariable(paraNameArr[i], args[i]);
}
return parser.parseExpression(key).getValue(context,String.class);
}
/**
* 获取被拦截方法对象
*
* MethodSignature.getMethod() 获取的是顶层接口或者父类的方法对象
* 而缓存的注解在实现类的方法上
* 所以应该使用反射获取当前对象的方法对象
*/
public Method getMethod(ProceedingJoinPoint pjp){
//获取参数的类型
Object [] args=pjp.getArgs();
Class [] argTypes=new Class[pjp.getArgs().length];
for(int i=0;i<args.length;i++){
argTypes[i]=args[i].getClass();
}
Method method=null;
try {
method=pjp.getTarget().getClass().getMethod(pjp.getSignature().getName(),argTypes);
} catch (NoSuchMethodException e) {
log.error(e.getMessage());
} catch (SecurityException e) {
log.error(e.getMessage());
}
return method;
}
/**
* 解析key
* @author zengfanqi
* @date 2019/5/6
* @param
* @return String
*/
public String resolvingKey(ProceedingJoinPoint call,String prefix,String key){
//如果key为空直接将方法名称作为key
String methodName = call.getSignature().getName();
if(StringUtils.isEmpty(key)){
return prefix + methodName;
}
//判断key是否是spel表达式
if(key.startsWith("#")){
Method method=getMethod(call);
String parsekey = parseKey(key,method,call.getArgs());
if(StringUtils.isEmpty(parsekey)){
parsekey = methodName;
}
key = prefix+parsekey;
}else{
key = prefix+key;
}
return key;
}
/**
* 校验conditions
* @author zengfanqi
* @date 2019/5/6
* @param
* @return
*/
public boolean checkConditions(ProceedingJoinPoint call,String conditions){
boolean flag = false;
Method method=getMethod(call);
String condition = parseKey(conditions,method,call.getArgs());
if("true".equals(condition)){
flag = true;
}
return flag;
}
}
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