Add lifecycle listener to Help server to open the browser once the server is ready

client/src/main/java/ctbrec/docs/DocServer.java

@@ -4,17 +4,17 @@ import ctbrec.servlet.AbstractDocServlet;
 import ctbrec.servlet.MarkdownServlet;
 import ctbrec.servlet.SearchServlet;
 import ctbrec.servlet.StaticFileServlet;
+import lombok.extern.slf4j.Slf4j;
 import org.eclipse.jetty.server.*;
 import org.eclipse.jetty.server.handler.HandlerList;
 import org.eclipse.jetty.servlet.ServletHandler;
 import org.eclipse.jetty.servlet.ServletHolder;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import org.eclipse.jetty.util.component.LifeCycle;
 
 import java.net.BindException;
 
+@Slf4j
 public class DocServer {
-    private static final Logger LOG = LoggerFactory.getLogger(DocServer.class);
 
     private static volatile boolean started = false;
 
@@ -22,7 +22,15 @@ public class DocServer {
     }
 
     public static synchronized void start() throws Exception {
+        start(() -> {
+        });
+    }
+
+    public static synchronized void start(Runnable callback) throws Exception {
+        log.info("DocServer.start");
         if (started) {
+            log.info("if started");
+            callback.run();
             return;
         }
 
@@ -53,12 +61,18 @@ public class DocServer {
         holder = new ServletHolder(staticFileServlet);
         handler.addServletWithMapping(holder, "/static/*");
 
+        server.addLifeCycleListener(new LifeCycle.Listener() {
+            @Override
+            public void lifeCycleStarted(LifeCycle event) {
+                callback.run();
+            }
+        });
 
         try {
             server.start();
             server.join();
         } catch (BindException e) {
-            LOG.error("Port {} is already in use", http.getPort(), e);
+            log.error("Port {} is already in use", http.getPort(), e);
         }
     }
 }

client/src/main/java/ctbrec/ui/tabs/HelpTab.java

@@ -1,19 +1,19 @@
 package ctbrec.ui.tabs;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import ctbrec.docs.DocServer;
 import ctbrec.ui.DesktopIntegration;
+import javafx.application.Platform;
 import javafx.geometry.Insets;
 import javafx.scene.control.Button;
 import javafx.scene.control.Tab;
 import javafx.scene.layout.BorderPane;
+import lombok.extern.slf4j.Slf4j;
 
+import java.util.concurrent.atomic.AtomicBoolean;
+
+@Slf4j
 public class HelpTab extends Tab {
 
-    private static final Logger LOG = LoggerFactory.getLogger(HelpTab.class);
-
     public HelpTab() {
         setClosable(true);
         setText("Help");
@@ -23,15 +23,27 @@ public class HelpTab extends Tab {
         var layout = new BorderPane(openHelp);
         BorderPane.setMargin(openHelp, new Insets(20));
         setContent(layout);
+        AtomicBoolean started = new AtomicBoolean(false);
         openHelp.setOnAction(e -> {
-            new Thread(() -> {
-                try {
-                    DocServer.start();
-                } catch (Exception ex) {
-                    LOG.error("Couldn't start documentation server", ex);
+                    synchronized (started) {
+                        if (!started.get()) {
+                            new Thread(() -> {
+                                try {
+                                    DocServer.start(() ->
+                                            Platform.runLater(() -> {
+                                                started.set(true);
+                                                DesktopIntegration.open("http://localhost:5689/docs/index.md");
+                                            })
+                                    );
+                                } catch (Exception ex) {
+                                    log.error("Couldn't start documentation server", ex);
+                                }
+                            }).start();
+                        } else {
+                            DesktopIntegration.open("http://localhost:5689/docs/index.md");
+                        }
+                    }
                 }
-            }).start();
-            DesktopIntegration.open("http://localhost:5689/docs/index.md");
-        });
+        );
     }
 }