如何在Java中使用Vertx调用API四次,然后继续。

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英文:

How to use vertx in java to call api 4 times and then proceed

问题

vertx.setPeriodic(1000, id -> {
//api call
if (count == 4){
vertx.cancelTime(id);
}
});
现在的问题是,我不想固定在1000毫秒的时间上,我只想调用API 4次,然后使用最终的API响应进行进一步处理,请帮忙。

英文:
vertx.setPeriodic(1000, id -> {
    //api call
    if (count == 4){
        vertx.cancelTime(id); 
    }
});

Now the problem is I don't want a fix 1000 ms time, I just want to call the api 4 times and then go with final api response for further processing , please help.

答案1

得分: 2

一种方法是使用递归方法。

因此,您可以将类似以下的内容实现为方便的入口点

private Future<YourResultType> callApiNTimes(final int repetitions) {
    final Promise<YourResultType> p = Promise.promise();

    recursiveApiCalls(p, 0, repetitions);

    return p.future();
}

递归实现如下

private void recursiveApiCalls(final Promise<YourResultType> p, final int counter, final int maxRepetitions) {
    yourRawApiCall().onComplete(reply -> {
        if (reply.failed()) {
            p.fail(reply.cause());
            return;
        }

        if (counter < maxRepetitions) {
            recursiveApiCalls(p, counter + 1, maxRepetitions);
            return;
        }

        p.complete(reply.result());
    });
}

最后,实现 yourRawApiCall,然后像这样使用它

callApiNTimes(4).onComplete(reply -> {
    if (reply.failed()) {
        // 出现错误,执行错误处理..
        return;
    }

    final YourResultType result = reply.result();

    // 处理您的结果..
});

另一种方法是将API调用作为Future放入列表中,然后使用 CompositeFuture.allCompositeFuture.join 等并行执行此列表,而不是一个接一个地执行。

英文:

One way is to use a recursive approach.

Therefore you can implement something like this as an convenient entrypoint

private Future<YourResultType> callApiNTimes(final int repetitions) {
    final Promise<YourResultType> p = Promise.promise();

    recursiveApiCalls(p, 0, repetitions);

    return p.future();
}

Recursion implemented as following

private void recursiveApiCalls(final Promise<YourResultType> p, final int counter, final int maxRepetitions) {
    yourRawApiCall().onComplete(reply -> {
        if (reply.failed()) {
            p.fail(reply.cause());
            return;
        }

        if (counter < maxRepetitions) {
            recursiveApiCalls(p, counter + 1, maxRepetitions);
            return;
        }

        p.complete(reply.result());
    });
}

At the end implement yourRawApiCall and then use it like this

callApiNTimes(4).onComplete(reply -> {
    if (reply.failed()) {
        // Something went wrong, do your error handling..
        return;
    }

    final YourResultType result = reply.result();

    // Do something with your result..
});

Antoher approach would be to put your API calls as Futures in a list
and execute this list in parallel with CompositeFuture.all, CompositeFuture.join, .. instead of one after another.

huangapple
  • 本文由 发表于 2020年8月6日 02:28:47
  • 转载请务必保留本文链接:https://go.coder-hub.com/63271426.html
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