com.github.tddts.jet.config.aspect.RetryAnnotationAspect.java Source code

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Here is the source code for com.github.tddts.jet.config.aspect.RetryAnnotationAspect.java

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/*
 * Copyright 2018 Tigran Dadaiants
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.github.tddts.jet.config.aspect;

import com.github.tddts.jet.config.spring.annotations.Retry;
import com.github.tddts.jet.rest.RestResponse;
import com.github.tddts.jet.util.SpringUtil;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;

/**
 * {@code RetryAnnotationAspect} as an Aspect definition implementing retry logic for REST client methods.
 *
 * @author Tigran_Dadaiants dtkcommon@gmail.com
 */
@Aspect
@Order(1)
@Component
public class RetryAnnotationAspect {

    @Pointcut("@within(com.github.tddts.jet.config.spring.annotations.RestClient)"
            + " && execution(public com.github.tddts.jet.rest.RestResponse *(..))"
            + " && @annotation(com.github.tddts.jet.config.spring.annotations.Retry)")
    public void restClientMethodRetryPointcut() {
    }

    @Around("restClientMethodRetryPointcut()")
    public Object restClientRetryHandlingAspect(ProceedingJoinPoint joinPoint) throws Throwable {
        Method method = SpringUtil.getMethod(joinPoint);

        Retry retry = method.getAnnotation(Retry.class);

        int count = retry.retries();
        int timeout = retry.timeout();

        RestResponse response = (RestResponse) joinPoint.proceed();

        while (count > 0 && response.hasError()) {
            Thread.sleep(timeout);
            response = (RestResponse) joinPoint.proceed();
            count--;
        }

        return response;
    }
}