Refactor connection reducer & tree

backend/src/Model/Tree.ts

@@ -1,7 +1,29 @@
 import { Edge, TreeNode } from './'
+import { EventBusInterface, makeConnectionMessageEvent, MqttMessage } from '../../../events'
+import { TreeNodeFactory } from './TreeNodeFactory'
 
 export class Tree extends TreeNode {
+  private connectionId?: string
+  private updateSource?: EventBusInterface
   constructor() {
     super(undefined, undefined)
   }
+
+  public updateWithConnection(emitter: EventBusInterface, connectionId: string) {
+    this.updateSource = emitter
+    this.updateSource.subscribe(makeConnectionMessageEvent(connectionId), this.handleNewData)
+  }
+
+  private handleNewData = (msg: MqttMessage) => {
+    const edges = msg.topic.split('/')
+    const node = TreeNodeFactory.fromEdgesAndValue(edges, msg.payload)
+    node.mqttMessage = msg
+    this.updateWithNode(node.firstNode())
+  }
+
+  public stopUpdating() {
+    if (this.updateSource && this.connectionId) {
+      this.updateSource.unsubscribeAll(makeConnectionMessageEvent(this.connectionId))
+    }
+  }
 }