guava-retry使用笔记

xml依赖

xml 复制代码

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

使用案例

重试3次，每次间隔3秒

java 复制代码

 /**
     * 重试3次，每次间隔3秒
     */
    @Test
    void testGuavaRetry(){
        //定义请求实现
        Callable<Boolean> callable = ()->{
            //do something...
            log.info("call task... ...");
            throw new RuntimeException();
        };

        //定义重试机制
        Retryer<Boolean> retryer = RetryerBuilder.<Boolean>newBuilder()
                //重试条件
                .retryIfResult(Objects::isNull)
                //异常重试源
                .retryIfExceptionOfType(IOException.class)
                .retryIfRuntimeException()
                .retryIfResult(res->res=false)
                //等待间隔时间
                .withWaitStrategy(WaitStrategies.fixedWait(3, TimeUnit.SECONDS))
                //设置最大重试次数
                .withStopStrategy(StopStrategies.stopAfterAttempt(3))
                .build();

        try {
            retryer.call(callable);
        }catch (RetryException | ExecutionException e){
            e.printStackTrace();
        }
    }

以指数递增的间隔等待重试

java 复制代码

 @Test
    void testGuavaRetry2(){
        Callable<Boolean> callable = ()->{
            //do something...
            log.info("call task... ...");
            throw new RuntimeException();
        };
        Retryer<Boolean> retryer = RetryerBuilder.<Boolean>newBuilder()
                .retryIfExceptionOfType(IOException.class)
                .retryIfRuntimeException()
                //以指数递增的间隔等待,直到最多5分钟，5分钟后，每隔5分钟重试1次
                .withWaitStrategy(WaitStrategies
                        .exponentialWait(100,5,TimeUnit.MINUTES))
                //设置永远重试
                .withStopStrategy(StopStrategies.neverStop())
                .build();
        try {
            retryer.call(callable);
        }catch (RetryException | ExecutionException e){
            e.printStackTrace();
        }
    }

失败后重试,按斐波那契回退间隔重试

java 复制代码

 @Test
    void testGuavaRetry3(){
        Callable<Boolean> callable = ()->{
            //do something...
            log.info("call task... ...");
            throw new RuntimeException();
        };
        Retryer<Boolean> retryer = RetryerBuilder.<Boolean>newBuilder()
                .retryIfExceptionOfType(IOException.class)
                .retryIfRuntimeException()
                //失败后重试,按斐波那契回退间隔,直到2分钟,2分钟后，每隔2分钟重试1次
                .withWaitStrategy(WaitStrategies
                        .fibonacciWait(100,2,TimeUnit.MINUTES))
                //设置永远重试
                .withStopStrategy(StopStrategies.neverStop())
                .build();
        try {
            retryer.call(callable);
        }catch (RetryException | ExecutionException e){
            e.printStackTrace();
        }


    }