Server: Remove redundant isStopped boolean

We can track the server status with the interrupted status of the
server thread. The isStopped boolean is not needed.

p2p/src/main/java/bisq/network/p2p/network/Server.java

@@ -27,7 +27,6 @@
 
 import java.util.Set;
 import java.util.concurrent.CopyOnWriteArraySet;
-import java.util.concurrent.atomic.AtomicBoolean;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -45,7 +44,6 @@ class Server implements Runnable {
  private final ServerSocket serverSocket;
  private final int localPort;
  private final Set<Connection> connections = new CopyOnWriteArraySet<>();
- private final AtomicBoolean isStopped = new AtomicBoolean(false);
  private final NetworkProtoResolver networkProtoResolver;
  private final Thread serverThread = new Thread(this);
 
@@ -97,7 +95,7 @@ public void run() {
  }
  }
  } catch (IOException e) {
- if (!isStopped.get())
+ if (isServerActive())
  e.printStackTrace();
  }
  } catch (Throwable t) {
@@ -108,17 +106,14 @@ public void run() {
 
  public void shutDown() {
  log.info("Server shutdown started");
- boolean isServerStopped = isStopped.getAndSet(true);
-
- if (!isServerStopped) {
+ if (isServerActive()) {
+ serverThread.interrupt();
  connections.forEach(connection -> connection.shutDown(CloseConnectionReason.APP_SHUT_DOWN));
 
  try {
  if (!serverSocket.isClosed()) {
  serverSocket.close();
  }
- serverThread.interrupt();
-
  } catch (SocketException e) {
  log.debug("SocketException at shutdown might be expected " + e.getMessage());
  } catch (IOException e) {
@@ -132,6 +127,6 @@ public void shutDown() {
  }
 
  private boolean isServerActive() {
- return !isStopped.get() && !Thread.currentThread().isInterrupted();
+ return !serverThread.isInterrupted();
  }
 }