Java開發利器之重試框架guava-retrying

<dependency>      <groupId>com.github.rholder</groupId>      <artifactId>guava-retrying</artifactId>      <version>2.0.0</version></dependency>

package com.hhwy.demo.test;

import com.github.rholder.retry.Retryer;
import com.github.rholder.retry.RetryerBuilder;
import com.github.rholder.retry.StopStrategies;

public class Test {
    private int invokeCount = 0;

    @org.junit.Test
    public void guavaRetryTest() {
        Retryer<Integer> retryer = RetryerBuilder.<Integer>newBuilder()
                // 非正數進行重試
                .retryIfRuntimeException()
                // 偶數則進行重試
                .retryIfResult(result -> result % 2 == 0)
                // 設置最大執行次數3次
                .withStopStrategy(StopStrategies.stopAfterAttempt(3)).build();

        try {
            invokeCount=0;
            retryer.call(() -> realAction(0));
        } catch (Exception e) {
            System.out.println("執行0，異常：" + e.getMessage());
        }

        try {
            invokeCount=0;
            retryer.call(() -> realAction(1));
        } catch (Exception e) {
            System.out.println("執行1，異常：" + e.getMessage());
        }

        try {
            invokeCount=0;
            retryer.call(() -> realAction(2));
        } catch (Exception e) {
            System.out.println("執行2，異常：" + e.getMessage());
        }
    }


    public int realAction(int num) {
        invokeCount++;
        System.out.println(String.format("當前執行第 %d 次,num:%d", invokeCount, num));
        if (num <= 0) {
            throw new IllegalArgumentException();
        }
        return num;
    }

}

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