musabgelisgen/spring-boot-throttling

Spring Boot Throttling

Overview

Declarative approach of throttling control over the Spring services. @Throttling annotation helps you to limit the number of service method calls per java.util.concurrent.TimeUnit for a particular user, IP address, HTTP header/cookie value, or using Spring Expression Language (SpEL).

Please see example project. Pull requests are welcome.

Getting Started

TODO

Samples

Defaults (Remote IP)

The following throttling configuration allows 1 method calls per SECOND for each unique HttpServletRequest#getRemoteAddr(). This is 'defaults' for @Throttling annotation.

@Throttling
public void serviceMethod() {
}

is the same as:

@Throttling(type = ThrottlingType.RemoteAddr, limit = 1, timeUnit = TimeUnit.SECONDS)
public void serviceMethod() {
}

Spring Expression Language (SpEL)

The following throttling configuration allows 3 method calls per MINUTE for each unique userName in model object passed as parameter, i.e. model.getUserName().

Please refer to official docs on SpEL.

@Throttling(type = ThrottlingType.SpEL, expression = "#model.userName", limit = 3, timeUnit = TimeUnit.MINUTES)
public void serviceMethod(Model model) {
    log.info("executing service logic for userName = {}", model.getUserName());
}

Http cookie value

The following throttling configuration allows 24 method calls per DAY for each unique cookie value retrieved from HttpServletRequest#getCookies().

@Throttling(type = ThrottlingType.CookieValue, cookieName = "JSESSIONID", limit = 24, timeUnit = TimeUnit.DAYS)
public void serviceMethod() {
}

Http header value

The following throttling configuration allows 10 method calls per HOUR for each unique header value retrieved from HttpServletRequest#getHeader('X-Forwarded-For').

@Throttling(type = ThrottlingType.HeaderValue, headerName = "X-Forwarded-For", limit = 10, timeUnit = TimeUnit.HOURS)
public void serviceMethod() {
}

User Principal Name

The following throttling configuration allows 1 method calls per HOUR for each unique HttpServletRequest#getUserPrincipal().getName().

@Throttling(type = ThrottlingType.PrincipalName, limit = 1, timeUnit = TimeUnit.HOURS)
public void serviceMethod() {
}

Error handling

ThrottlingException is thrown when method reaches @Throttling configuration limit. Service method won't be executed.

@ResponseStatus(code = HttpStatus.TOO_MANY_REQUESTS, reason = "Too many requests")
public class ThrottlingException extends RuntimeException {
}

License

Spring Boot Throttling is Open Source software released under the Apache 2.0 license.