Extract ChangeBuffer to own file

backend/src/Model/ChangeBuffer.ts

@@ -0,0 +1,38 @@
+import { MqttMessage } from '../../../events'
+
+export class ChangeBuffer {
+  private buffer: MqttMessage[] = []
+  private size = 0
+  private maxSize = 100_000_000 // ~100MB
+  public length = 0
+  public estimatedMessageOverhead = 24
+
+  public push(val: MqttMessage) {
+    if (!this.isFull()) {
+      this.buffer.push(val)
+      this.size += this.estimatedMessageOverhead + (val.payload ? val.payload.length : 0)
+      this.length += 1
+    }
+  }
+
+  public getSize() {
+    return this.size
+  }
+
+  public isFull() {
+    return this.size >= this.maxSize
+  }
+
+  public fillState() {
+    return this.size / this.maxSize
+  }
+
+  public popAll(): MqttMessage[] {
+    const tmpBuffer = this.buffer
+    this.buffer = []
+    this.size = 0
+    this.length = 0
+
+    return tmpBuffer
+  }
+}

backend/src/Model/Tree.ts

@@ -1,44 +1,13 @@
+import { ChangeBuffer } from './ChangeBuffer'
+import {
+  EventBusInterface,
+  EventDispatcher,
+  makeConnectionMessageEvent,
+  MqttMessage
+} from '../../../events'
 import { TreeNode } from './'
-import { EventBusInterface, makeConnectionMessageEvent, MqttMessage, EventDispatcher } from '../../../events'
 import { TreeNodeFactory } from './TreeNodeFactory'
 
-class ChangeBuffer {
-  private buffer: MqttMessage[] = []
-  private size = 0
-  private maxSize = 100_000_000 // ~100MB
-  public length = 0
-  public estimatedMessageOverhead = 24
-
-  public push(val: MqttMessage) {
-    if (!this.isFull()) {
-      this.buffer.push(val)
-      this.size += this.estimatedMessageOverhead + (val.payload ? val.payload.length : 0)
-      this.length += 1
-    }
-  }
-
-  public getSize() {
-    return this.size
-  }
-
-  public isFull() {
-    return this.size >= this.maxSize
-  }
-
-  public fillState() {
-    return this.size / this.maxSize
-  }
-
-  public popAll(): MqttMessage[] {
-    const tmpBuffer = this.buffer
-    this.buffer = []
-    this.size = 0
-    this.length = 0
-
-    return tmpBuffer
-  }
-}
-
 export class Tree<ViewModel> extends TreeNode<ViewModel> {
   public connectionId?: string
   public updateSource?: EventBusInterface