how can a Client connection wait for a server to be set up?

Core Library Questions

fearless_..

how can a Client connection wait for a server to be set up?

in Core Library Questions • 1 year ago

This is related to this forum question, but a bit different. I've got a reader thread that connects to a data source via

              
               new Client(this, "127.0.0.1", 5204)

I'd like to sleep and retry until the other side of the connection is set up. But if it's not set up, I'll get a

java.net.ConnectException: Connection refused

error. But I don't see a way to catch that error, nor a way to test for the connection before calling new.

I'd be happy to look at the sources for Client, but the link given in the original forum question is broken. To distill this down to two concise questions:

How do I wait for the server connection to become established?
Where are the sources for Client?

Replies(1)

fearless_..

Re: how can a Client connection wait for a server to be set up?

1 year ago

Oh! I just re-read the original post and I realize that my thread isn't crashing -- Client is just printing a stack trace. So I *can* sleep and retry, as in:

Client waitForConnection(PApplet _parent, String host, int port) {
while (true) {
Client client = new Client(_parent, host, port);
if (client.active()) {
return client;
} else {
sleep(5000);
}
}
}

It's a little messy since it prints a stack trace on the console every five seconds while waiting for a connection, but I can live with that.

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