当多个时间调用相同的方法时，取消方法调用 [英] Cancelling method calls when the same method is called multiple time

问题描述

我认为这里可能有一个名字，但我不知道。所以我的第一个问题是知道这种技术的名称。

这里有一个例子：假设你正在网页上实现实时搜索。每当用户在搜索框中键入时，您将触发一个新的搜索查询，并且尽可能多地更新结果。
这是一个愚蠢的事情，因为你会发送比你实际需要的更多的查询。每2-3个字母发送一次请求或每100ms最多发送一次请求可能就足够了。

因此，一种技术可以安排在密钥后不久执行的查询是键入的，如果仍然有计划但未执行的查询，请取消它们，因为现在已经过时了。

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更具体地说，在Java中解决这个问题有哪些特定的模式或图书馆？

我不得不在Swing应用程序中解决问题，我使用了ExecutorService，它返回了可以取消的ScheduledFutures。问题是我不得不为每个想要缓冲的方法调用手动创建一个Runnable，并跟踪每个未来以取消它。

我确定我不是第一个实现这样的人，所以在某个地方必须有一个可重用的解决方案可能在Spring中有注释和代理的东西？

解决方案

给出其他答案，经过一些搜索，似乎确实没有图书馆这就是我想要的。

我创建了一个并放在GitHub上。这个问题的未来读者可能会发现它很有趣。

https://github.com/ThomasGirard/JDebounce

我不认为这是非常好的，但至少它的作品可以声明地使用：

  @Debounce（delayMilliseconds = 100）
 public void debouncedMethod（int callID，DebounceTest callback）{} 
  

I think there's probably a name for what I'm describing here, but I don't know it. So my first question would be to know the name of this technique.

Here's an example: suppose you're implementing live search on a web page. Everytime the user types in the search box, you fire a new search query, and the results are updated as often as possible. This is a stupid thing to do because you'll send much more queries than you actually need. Sending a request once per 2-3 letters or at most once per 100 ms is probably sufficient.

A technique is thus to schedule the queries to be executed soon after a key is typed, and if there are still queries that were planned but not executed, cancel them since they're obsolete now.

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Now more specifically, are there specific patterns or librairies for solving this problem in Java ?

I had to solve the problem in a Swing app, and I used an ExecutorService, which returned ScheduledFutures that I could cancel. The problem is that I had to manually create a Runnable for each method call I wanted to "buffer", and keep track of each Future to cancel it.

I'm sure I'm not the first person to implement something like this, so there must be a reusable solution somewhere ? Possibly something in Spring with annotations and proxies ?

解决方案

Given the other answers, and after some searching, it seems there's indeed no library that does what I wanted.

I created one and put it on GitHub. Future readers of this question may find it interesting.

https://github.com/ThomasGirard/JDebounce

I don't think it's very good yet but at least it works and can be used declaratively:

@Debounce(delayMilliseconds = 100)
public void debouncedMethod(int callID, DebounceTest callback) { }

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