Question

I have a thread in Java which starts a HttpService.

ProcessBuilder pb = new ProceeBuilder(command);
Process process = pb.start();
process.waitFor();

I have another thread which checks if the service is started.

while (result != 0) {
  ServerSocket socket = new ServerSocker(port);
  socket.close();
  result = 0
  catch (BindException be) {
    result = 1;
  }
}

Now I need to somehow get information about whether the service has failed to start or it’s successfully started. I need to get this back to the Main class which started both of these threads in order to proceed. Something like

while (!started || !failed) {
     wait for getting information from the threads.
}

What can you advise?
Thank you.

Answer 1

How about using a callback that you pass to both threads?

(omitted try-catches)

public class MyCallback {
  private Boolean processSuccess;
  private Boolean serviceSuccess;
  public synchronized void notifyProcessStart(boolean success) {
    this.processSuccess = success;
    this.notifyAll();
  }
  public synchronized void notifyServiceCheck(boolean success) {
    this.serviceSuccess = success;
    this.notifyAll();
  }
  public synchronized void waitForResult() {
    while(processSuccess == null || serviceSuccess == null) {
      this.wait();
    }
    // ... do something good
  }
}