java-如何处理CompletableFutures链中的错误响应？

我的项目中有很长的可完成期货链,每个步骤都调用一个后端API,该API可以给出多个错误响应和一个成功响应.现在,在解析响应之后,我需要判断是否是错误,然后需要向用户显示.我还需要知道链中的哪个阶段产生了此错误.

我现在的方法(如下所示)是每当遇到错误响应时抛出运行时异常,然后将异常块附加到我的链中.我觉得这不是最好的方法,因为运行时异常不适用于这种情况.这也使我的代码很难看,因为每当我处理响应时都必须这样做,从而导致额外的异常检查.有更好的方法吗？

CompletableFuture.supplyAsync(() -> {
    //some api call
    Response response = request.send();

    if(response.hasError()){ //this is what I am doing right now
        logger.error("this is error response");
        throw new ResponseErrorException("Error response received for request");
    }
})

对于链中的每个步骤,基本上都重复此过程.

简介：如果在CompletableFuture链的任何步骤中都收到失败响应,那么将其传播给用户的好方法是什么？

编辑：如果没有更好的方法,请随时分享您对我的方法的看法.

解决方法:

我的建议是将Decorator模式用于响应.建议你有这样的东西

CompletableFuture
.supplyAsync(() -> {
    //some api call
    Response response = request.send();

    if(response.hasError()){ //this is what I am doing right now
        throw new ResponseErrorException("Error response received for request");
    }
})
.thenApply(() -> {
    //some api call
    Response response = request.send();

    if(response.hasError()){ //this is what I am doing right now
        throw new ResponseErrorException("Another Error response received for request");
    }
})
.exceptionally(ex -> "Error: " + ex.getMessage());

如果您想避免重复抛出异常,可以使用以下方法

CompletableFuture
.supplyAsync(() -> {
    //some api call
    Response response = ThrowExceptionOnErrorResponse(request.send());
})
.thenApply(() -> {
    //some api call
    Response response = ThrowExceptionOnErrorResponse(request.send());
    }
})
.exceptionally(ex -> "Error: " + ex.getMessage());

class ThrowExceptionOnError implements Response {

    Response originalResponse;

    ThrowExceptionOnError(Response originalResp) {
        if(response.hasError()) {
           throw new ResponseErrorException("Another Error response received for request");
        }
        this.originalResponse = originalResponse;
}

标签：completable-future,asynchronous,exception,exception-handling,java
来源： https://codeday.me/bug/20191211/2106424.html