Guava-Retrying实现重试机制

1、引用jar包

    com.github.rholder
    guava-retrying
    2.0.0

2、创建重试器对象

private final static Retryer retryer = RetryerBuilder.newBuilder()
       .retryIfResult(Predicates.isNull())// 1.1当重试的方法返回null时候进行重试
       .retryIfExceptionOfType(IOException.class)// 1.2当重试方法抛出IOException类型异常时候进行重试
       .withStopStrategy(StopStrategies.stopAfterAttempt(3))// 1.3尝试执行三次（也就是重试2次）
       .withWaitStrategy(WaitStrategies.fixedWait(2, TimeUnit.SECONDS))//1.4重试间隔
       .build();

3、需要重试的方法，以及方法实现

Callable callable = new Callable() {
    public Boolean call() throws Exception {
        Boolean status = AccessInterface(tokenUrl,tokenMap,url,userBody,uuid,nameSize);
        if(status == false){
            return null;// do something useful here
        }else{
            return true;
        }
    }
};

public boolean AccessInterface(String tokenUrl, HashMap tokenMap,
            String url, String userBody,
            String uuid, int nameSize) throws Exception {

    ...
    if(...){
        ...
    }else{
        return false
    }
    return true;
}

4、添加需要重试的方法到执行器

try {
    Boolean result = retryer.call(callable);
    System.out.println(result);
} catch (RetryException e) {
    e.printStackTrace();
} catch (ExecutionException e) {
    e.printStackTrace();
}