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working on event reception in Kanban

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This commit is contained in:
Stephan Richter
2025-12-19 16:07:30 +01:00
parent bad244ef16
commit 3b3803dafa
9 changed files with 116 additions and 38 deletions
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23
bus/src/main/java/de/srsoftware/umbrella/messagebus/Event.java
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@@ -1,10 +1,11 @@
/* © SRSoftware 2025 */
package de.srsoftware.umbrella.messagebus;
import de.srsoftware.umbrella.core.model.UmbrellaUser;
public class Event {
public abstract class Event<Payload> {
public enum Type{
public enum EventType {
CREATE,
UPDATE,
DELETE;
@@ -12,21 +13,23 @@ public class Event {
private UmbrellaUser initiator;
private String realm;
private Object payload;
private Type type;
private Payload payload;
private EventType eventType;
public Event(UmbrellaUser initiator, String realm, Object payload, Type type){
public Event(UmbrellaUser initiator, String realm, Payload payload, EventType type){
this.initiator = initiator;
this.realm = realm;
this.payload = payload;
this.type = type;
this.eventType = type;
}
public String json() {
return "TODO"; // TODO
public String eventType(){
return eventType.toString();
}
public String type(){
return type.toString();
public abstract String json();
public Payload payload(){
return payload;
}
}

1
bus/src/main/java/de/srsoftware/umbrella/messagebus/EventListener.java
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@@ -1,3 +1,4 @@
/* © SRSoftware 2025 */
package de.srsoftware.umbrella.messagebus;
public interface EventListener {

36
bus/src/main/java/de/srsoftware/umbrella/messagebus/EventQueue.java Normal file
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@@ -0,0 +1,36 @@
/* © SRSoftware 2025 */
package de.srsoftware.umbrella.messagebus;
import static de.srsoftware.umbrella.messagebus.MessageBus.messageBus;
import java.net.InetSocketAddress;
import java.util.LinkedList;
import java.util.Objects;
public class EventQueue extends LinkedList<Event> implements AutoCloseable, EventListener {
private final InetSocketAddress addr;
public EventQueue(InetSocketAddress addr){
this.addr = addr;
messageBus().register(this);
}
public void close() {
messageBus().drop(this);
}
@Override
public int hashCode() {
return addr.hashCode();
}
@Override
public void onEvent(Event event) {
System.getLogger(addr.toString()).log(System.Logger.Level.INFO,"adding event to queue of {1}: {0}",event.eventType(),addr);
add(event);
}
}

51
bus/src/main/java/de/srsoftware/umbrella/messagebus/MessageApi.java
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@@ -1,43 +1,54 @@
/* © SRSoftware 2025 */
package de.srsoftware.umbrella.messagebus;
import static de.srsoftware.umbrella.core.Constants.*;
import static de.srsoftware.umbrella.core.ModuleRegistry.userService;
import static java.lang.System.Logger.Level.*;
import static java.net.HttpURLConnection.HTTP_OK;
import com.sun.net.httpserver.HttpExchange;
import de.srsoftware.tools.MimeType;
import de.srsoftware.tools.Path;
import de.srsoftware.tools.SessionToken;
import de.srsoftware.umbrella.core.BaseHandler;
import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
import de.srsoftware.umbrella.core.model.Token;
import java.io.IOException;
import java.io.PrintWriter;
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;
import java.net.InetSocketAddress;
import java.util.Optional;
public class MessageApi extends BaseHandler{
private static final System.Logger LOG = System.getLogger(MessageApi.class.getSimpleName());
private List<Event> eventQueue = new LinkedList<>();
@Override
public boolean doGet(Path path, HttpExchange ex) throws IOException {
addCors(ex);
Optional<Token> token = SessionToken.from(ex).map(Token::of);
var user = userService().loadUser(token);
//if (user.isEmpty()) return unauthorized(ex); // TODO
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);
headers.add(CONTENT_ENCODING,NONE);
ex.sendResponseHeaders(HTTP_OK,0);
try (var os = ex.getResponseBody(); var stream = new PrintWriter(os)){
try (var os = ex.getResponseBody(); var stream = new PrintWriter(os); var eventQueue = new EventQueue(addr)){
LOG.log(INFO,"{0} opened event stream.",addr);
var counter = 0;
var id = 0L;
while (!stream.checkError()){
Thread.sleep(100);
if (eventQueue.isEmpty()){
if (++counter > 300) counter = sendBeacon(stream);
if (++counter > 300) counter = sendBeacon(addr,stream);
} else {
sendEvent(stream,id++,eventQueue.remove(0));
var elem = eventQueue.remove(0);
LOG.log(DEBUG,"sending event to {0}",addr);
sendEvent(stream,elem);
counter = 0;
}
}
@@ -45,20 +56,24 @@ public class MessageApi extends BaseHandler{
return true;
} catch (InterruptedException e) {
throw new UmbrellaException("EventStream broken").causedBy(e);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private void sendEvent(PrintWriter out, long id, Event event) {
private void sendEvent(PrintWriter out, Event event) {
if (event == null) return;
out.printf("event: %s%n", event.type());
out.printf("id: %s%n", id);
out.printf("data: %s%n", event.json());
out.print("\n"); // terminate message with empty line
out.print("event: ");
out.println(event.eventType());
out.print("data: ");
out.println(event.json());
out.println();
out.println(); // terminate message with empty line
out.flush();
}
private int sendBeacon(PrintWriter stream) {
LOG.log(DEBUG,"sending keep-alive…");
private int sendBeacon(InetSocketAddress addr, PrintWriter stream) {
LOG.log(DEBUG,"sending keep-alive to {0}",addr);
stream.print(": keep-alive\n\n");
stream.flush();
return 0;

1
bus/src/main/java/de/srsoftware/umbrella/messagebus/MessageBus.java
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@@ -1,3 +1,4 @@
/* © SRSoftware 2025 */
package de.srsoftware.umbrella.messagebus;
import java.util.HashSet;

18
bus/src/main/java/de/srsoftware/umbrella/messagebus/TaskEvent.java
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@@ -1,11 +1,19 @@
/* © SRSoftware 2025 */
package de.srsoftware.umbrella.messagebus;
import de.srsoftware.umbrella.core.model.UmbrellaUser;
import static de.srsoftware.umbrella.core.Constants.TASK;
public class TaskEvent extends Event{
public TaskEvent(UmbrellaUser initiator,Object payload, Type type){
super(initiator,TASK,payload, type);
import de.srsoftware.umbrella.core.model.Task;
import de.srsoftware.umbrella.core.model.UmbrellaUser;
import org.json.JSONObject;
public class TaskEvent extends Event<Task>{
public TaskEvent(UmbrellaUser initiator, Task task, EventType type){
super(initiator,TASK, task, type);
}
@Override
public String json() {
return new JSONObject(payload().toMap()).toString();
}
}