Java套接字：重试Connection Refused异常的最佳方法？ [英] Java sockets: best way to retry upon Connection Refused exception?

问题描述

现在我正在这样做：

while (true) {
    try {
        SocketAddress sockaddr = new InetSocketAddress(ivDestIP, ivDestPort);
        downloadSock = new Socket();
        downloadSock.connect(sockaddr);
        this.oos = new ObjectOutputStream(downloadSock.getOutputStream());
        this.ois = new ObjectInputStream(downloadSock.getInputStream());
        break;
    } catch (Exception e) {}
}

如果远程主机没有在套接字上侦听，则downloadSock.connect（sockaddr）将生成 ConnectionRefused 异常。我在一个单独的线程中运行我的代码，所以我不担心阻塞。鉴于此，我的重试方法是否适当或有更好的方法???

downloadSock.connect(sockaddr) will generate a ConnectionRefused exception if the remote host is not listening on the socket. I'm running my code in a separate thread, so I'm not worried about blocking. Given this, is my method of retrying appropriate or is there a better way???

谢谢！

推荐答案

在这种情况下，我通常会在每次请求时使用逐渐延长的睡眠时间。

In this case I usually use a progressively longer sleep period each request.

可能是服务器差不多了，所以你只想在一秒钟后再试一次。但如果该请求失败，请等待2秒，但如果该请求失败，请等待4等等。

It could be that the server is almost up, so you just want to try again in a second. But if that request fails, wait 2 seconds, but if that one fails, wait 4, etc.

可能是您要等待等待的数量为30几秒钟或一分钟或类似的事情。定义最大尝试次数可能是明智的，因此您不必无限期地等待。

It may be that you want to cap the amount of waiting to 30 seconds or a minute or something like that. It's probably wise to define the maximum number of tries so you don't just wait indefinitely.

这样的事情可能会以秒为单位计算下一个延迟：

Something like this might calculate your next delay in seconds:

seconds_to_wait = Math.min(60, Math.pow(2, try_num));

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