guava-retry使用笔记

guava-retry使用笔记

xml依赖

<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

 /*** 重试3次，每次间隔3秒*/@Testvoid 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

 @Testvoid 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

 @Testvoid 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();}}