better memory management

Author: Hongyan Jiang

Changelog.md

@@ -1,6 +1,8 @@
 # Changelog
 
+
 ## 1.8.4
+- better memory management
 - add drop beacon handler
 
 ## 1.8.3

Sources/InstanaAgent/Beacons/BeaconFlusher.swift

@@ -50,7 +50,13 @@ class BeaconFlusher {
     let urlSession = URLSession(configuration: .default)
     var errors = [Error]()
     var retryStep: Int = 0
-    private var flushItem: DispatchWorkItem?
+    private weak var flushItem: DispatchWorkItem? {
+        willSet {
+            flushItem?.cancel()
+            cancel()
+        }
+    }
+
     private let completion: (BeaconFlusher.Result) -> Void
     private let queue: DispatchQueue
     private let externalSend: Sender? // Used for Unit Testing