自定义注解基于Redis实现频控限流、分布式ID和分布式锁的示例代码如下：
频控限流注解定义：
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface RateLimiter {
// 时间窗口大小
int timeWindow() default 10;
// 允许的最大访问次数
int maxCount() default 20;
}
频控限流的处理：
public class RateLimiterInterceptor implements MethodInterceptor {
private String getKey(Method method, Object[] args) {
// 生成key
}
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
Method method = invocation.getMethod();
RateLimiter rateLimiter = method.getAnnotation(RateLimiter.class);
if (rateLimiter != null) {
String key = getKey(method, invocation.getArguments());
// 使用Redis进行频控限流逻辑
// 比如：检查Redis中key的计数器是否超过maxCount，或者增加计数器
}
return invocation.proceed();
}
}
分布式ID生成：
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface DistributedId {
// 业务前缀
String prefix() default "";
}
分布式ID处理：
public class DistributedIdInterceptor implements MethodInterceptor {
private String getKey(Method method, Object[] args) {
// 生成key
}
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
Method method = invocation.getMethod();
DistributedId distributedId = method.getAnnotation(DistributedId.class);
if (distributedId != null) {
String key = getKey(method, invocation.getArguments());
// 使用Redis进行分布式ID生成逻辑
// 比如：通过INCR命令或者Lua脚本原子性地生成唯一ID
}
return invocation.proceed();
}
}
分布式锁实现：
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface DistributedLock {
// 锁的有效时间
int timeout() default 10;
}
分布式锁处理：
public class DistributedLockInterceptor implements MethodInterceptor {
private String getKey(Method method, Object[] args) {
// 生成key
}
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
Method method = invocation.getMethod();
DistributedLock distributedLock = method.getAnnotation(DistributedLock.class);
if (distributedLock != null) {
String key = getKey(method, invocation.getArgum