From a924f25f51d6ce9a2740639cc1634d9c3c26bc48 Mon Sep 17 00:00:00 2001
From: Stephan Richter <s.richter@srsoftware.de>
Date: Tue, 16 Dec 2025 15:26:39 +0100
Subject: [PATCH] preparing event bus

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>
---
 bus/build.gradle.kts                          |  6 +++++
 .../srsoftware/umbrella/messagebus/Event.java |  4 +++
 .../umbrella/messagebus/EventListener.java    |  5 ++++
 .../umbrella/messagebus/MessageBus.java       | 27 +++++++++++++++++++
 settings.gradle.kts                           |  1 +
 5 files changed, 43 insertions(+)
 create mode 100644 bus/build.gradle.kts
 create mode 100644 bus/src/main/java/de/srsoftware/umbrella/messagebus/Event.java
 create mode 100644 bus/src/main/java/de/srsoftware/umbrella/messagebus/EventListener.java
 create mode 100644 bus/src/main/java/de/srsoftware/umbrella/messagebus/MessageBus.java

diff --git a/bus/build.gradle.kts b/bus/build.gradle.kts
new file mode 100644
index 0000000..5bf8c1c
--- /dev/null
+++ b/bus/build.gradle.kts
@@ -0,0 +1,6 @@
+description = "Umbrella : Messagebus"
+
+dependencies{
+    implementation(project(":core"))
+}
+
diff --git a/bus/src/main/java/de/srsoftware/umbrella/messagebus/Event.java b/bus/src/main/java/de/srsoftware/umbrella/messagebus/Event.java
new file mode 100644
index 0000000..d28834c
--- /dev/null
+++ b/bus/src/main/java/de/srsoftware/umbrella/messagebus/Event.java
@@ -0,0 +1,4 @@
+package de.srsoftware.umbrella.messagebus;
+
+public class Event {
+}
diff --git a/bus/src/main/java/de/srsoftware/umbrella/messagebus/EventListener.java b/bus/src/main/java/de/srsoftware/umbrella/messagebus/EventListener.java
new file mode 100644
index 0000000..52f115f
--- /dev/null
+++ b/bus/src/main/java/de/srsoftware/umbrella/messagebus/EventListener.java
@@ -0,0 +1,5 @@
+package de.srsoftware.umbrella.messagebus;
+
+public interface EventListener {
+	public void onEvent(Event event);
+}
diff --git a/bus/src/main/java/de/srsoftware/umbrella/messagebus/MessageBus.java b/bus/src/main/java/de/srsoftware/umbrella/messagebus/MessageBus.java
new file mode 100644
index 0000000..aaa1ad6
--- /dev/null
+++ b/bus/src/main/java/de/srsoftware/umbrella/messagebus/MessageBus.java
@@ -0,0 +1,27 @@
+package de.srsoftware.umbrella.messagebus;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class MessageBus {
+	private static MessageBus SINGLETON = new MessageBus();
+	private Set<EventListener> listeners = new HashSet<>();
+
+	private MessageBus(){}
+
+	public void dispatch(Event event){
+		listeners.parallelStream().forEach(l -> l.onEvent(event));
+	}
+
+	public void drop(EventListener listener){
+		listeners.remove(listener);
+	}
+
+	public static MessageBus messageBus(){
+		return SINGLETON;
+	}
+
+	public void register(EventListener listener){
+		listeners.add(listener);
+	}
+}
\ No newline at end of file
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 950a44a..aaf9341 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -2,6 +2,7 @@ rootProject.name = "Umbrella25"
 
 include("backend")
 include("bookmark")
+include("bus")
 include("company")
 include("contact")
 include("core")