macOS How to create daemon thread?

stevejobbers said:

I wrote a simple Java program that I'd like to run when I login and have it continue to run in the background (it's a server for a simple client/server program).

Currently I have a 'command' file that I'm using to start the process, but I have to keep doing it manually and it opens a Terminal window on the dock. I'm hoping there is a way to configure it to run in the background automatically when I log in.

Thanks guys!!!

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rrpalma said:

You might want to check Bruce Eckel's free on-line (and downloadable) book Thinking in Java. If I remember correctly, there's a couple of examples.

What you should basically consider doing thin infinite loop:

done = false;
while (!done) {
.....
//update done if necessary
}

then inside the loop, use a socket to hear for requests on a specific port, and when you get a request, create a new thread to service that request. Main thread keeps listening for new incoming requests.

Then use launchd to invoke this program via java "YourProgram"

Hope that helps.

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Cromulent said:

A launchd server process should quit when not in use so that infinite loop breaks best practice policy. Launchd handles the loading and unloading of server processes as and when they are required to conserve memory and CPU resources.

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