spring retry, guava retrying比较

spring retry基于aop,重试限制较多，基于抛出的异常进行重试，如果客户端把异常捕获了，没有抛出，重试就会失效。

guava retrying可以基于异常、基于返回结果做重试，即使客户端捕获异常，照样可以重试

使用灵活，目前没发现现有注解使用，只能自己封装工具类

package com.yintech.yk.secret.api.utils;

import com.github.rholder.retry.Retryer;
import com.github.rholder.retry.RetryerBuilder;
import com.github.rholder.retry.StopStrategies;
import com.github.rholder.retry.WaitStrategies;
import com.yintech.yk.secret.api.listener.VaultRetryListener;
import org.springframework.vault.VaultException;
import org.springframework.web.client.ResourceAccessException;

import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;

public class GuavaRetryer {

    private GuavaRetryer(){}

    /**
     * 初始化重试实例
     */
    public static Retryer GuavaRetryer(){
        Retryer retryer = RetryerBuilder.newBuilder()
                .retryIfExceptionOfType(VaultException.class)
                .retryIfExceptionOfType(ResourceAccessException.class)
                //重调等待时间
                .withWaitStrategy(WaitStrategies.fixedWait(200, TimeUnit.MILLISECONDS))
                //尝试次数
                .withStopStrategy(StopStrategies.stopAfterAttempt(3))
                //重试监听器
                .withRetryListener(new VaultRetryListener())
                .build();
        return retryer;
    }

    /**
     * 执行可重试方法
     * @param callable
     * @return
     * @throws Exception
     */
    public static T executeWithRetry(Callable callable) throws Exception {
        Retryer retryer = GuavaRetryer();
        return retryer.call(callable);
    }
}

    /**
     * AES解密
     * @param cipherText 密文
     * @return 明文
     */
    protected static String decryptByAes(String cipherText) throws Exception {
        VaultInfoCache instance = VaultInfoCache.getInstance();
        return GuavaRetryer.executeWithRetry(()-> {
            VaultTransitOperations vaultTransitOperations = instance.getVaultTemplate().opsForTransit(instance.getCacheMap()
                    .get(SecretConstants.PATH_KEY));
            String keyName = instance.getCacheMap().get(String.format(SecretConstants.AES_KEY_NAME,
                    secretProperties.getSystemCode()));
            return vaultTransitOperations.decrypt(keyName, cipherText);
        });
    }

参考资料

重试机制！java retry(重试) spring retry, guava retrying 详解 - JavaShuo