working on message bus

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

backend/src/main/java/de/srsoftware/umbrella/backend/Application.java

@@ -64,7 +64,7 @@ public class Application {
 		var server            = HttpServer.create(new InetSocketAddress(port), 0);
 		try {
 			new Translations().bindPath("/api/translations").on(server);
-			new MessageApi().bindPath().on(server);
+			new MessageApi().bindPath("/api/bus").on(server);
 			new MessageSystem(config);
 			new UserModule(config).bindPath("/api/user").on(server);
 			new TagModule(config).bindPath("/api/tags").on(server);

bus/src/main/java/de/srsoftware/umbrella/messagebus/MessageApi.java

@@ -12,6 +12,7 @@ import java.util.LinkedList;
 import java.util.List;
 
 import static de.srsoftware.umbrella.core.Constants.*;
+import static java.lang.System.Logger.Level.*;
 import static java.net.HttpURLConnection.HTTP_OK;
 
 public class MessageApi extends BaseHandler{
@@ -22,23 +23,26 @@ public class MessageApi extends BaseHandler{
 	@Override
 	public boolean doGet(Path path, HttpExchange ex) throws IOException {
 		var headers = ex.getResponseHeaders();
+		var addr = ex.getRemoteAddress();
 		headers.add(CONTENT_TYPE, MimeType.MIME_EVENT_STREAM);
 		headers.add(CACHE_CONTROL,NO_CACHE);
 		headers.add(CONNECTION,KEEP_ALIVE);
 		ex.sendResponseHeaders(HTTP_OK,0);
 		try (var os = ex.getResponseBody(); var stream = new PrintWriter(os)){
+			LOG.log(INFO,"{0} opened event stream.",addr);
 			var counter = 0;
 			var id = 0L;
-			while (true){
+			while (!stream.checkError()){
 				Thread.sleep(100);
 				if (eventQueue.isEmpty()){
-					counter++;
-					if (counter > 300) counter = sendBeacon(stream);
+					if (++counter > 300) counter = sendBeacon(stream);
 				} else {
 					sendEvent(stream,id++,eventQueue.remove(0));
 					counter = 0;
 				}
 			}
+			LOG.log(INFO,"{0} disconnected from event stream.",addr);
+			return true;
 		} catch (InterruptedException e) {
 			throw new UmbrellaException("EventStream broken").causedBy(e);
 		}
@@ -54,6 +58,7 @@ public class MessageApi extends BaseHandler{
 	}
 
 	private int sendBeacon(PrintWriter stream) {
+		LOG.log(DEBUG,"sending keep-alive…");
 		stream.print(": keep-alive\n\n");
 		stream.flush();
 		return 0;