是否可以在同一时间读取和写入文件？ [英] Is it possible to read and write in file at the same time?

问题描述

以下是场景：

• ThreadA将从某个套接字读取数据，并将数据写入MyFile.txt


• ThreadB将读取MyFile，当它到达最后时，它将循环直到MyFile中有新的数据可用（因为我不想重新打开MyFile.txt ，并失去了时间，所以我到达我所在的位置..）。
  
  
  

  是否有可能做这样的事情？
  
  

  如果不是，还有另外一种方法可以做这样的事情吗？ 解决方案

您提到的问题是一个着名的生产者消费者问题

常见的解决方法是使用 BlockingQueue

真实世界的一个例子是 AjaxYahooSearchEngineMonitor

线程B做的是，它将从中获取项目逐一排队，并对其进行处理。
当队列中没有项目时，线程B就会在那里等待。请参阅源代码的第83行。

Here's the scenario:

• ThreadA is going to read from some socket, and write data to "MyFile.txt"
• ThreadB is going to read "MyFile", and when it reaches the end, it will loops until new data are available in MyFile (because i don't want to re-open "MyFile.txt", and lose the time so i reach the position from where i was..).

Is it possible to do such a thing ?

If not, is there another way to do such a thing ?

解决方案

The problem you mention is a famous Producer Consumer Problem

Common solution to this is to use BlockingQueue

An example of real world usage is in AjaxYahooSearchEngineMonitor

What Thread A does is, it will submit a string to queue, and then return immediately.

What Thread B does is, it will pick up the item from queue one by one, and process them. When there is no item in the queue, Thread B will just wait there. See line 83 of the source code.

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