add new property flushBatchSize for fine tuning the network request

MixpanelDemo/MixpanelDemoTests/MixpanelDemoTests.swift

@@ -27,7 +27,7 @@ class MixpanelDemoTests: MixpanelBaseTests {
         XCTAssert(waitTime >= 110, "Network backoff time is less than 2 minutes.")
         XCTAssert(testMixpanel.flushInstance.flushRequest.networkConsecutiveFailures == 2,
                   "Network failures did not equal 2")
-
+        
         XCTAssert(eventQueue(token: testMixpanel.apiToken).count == 2,
                   "Removed an event from the queue that was not sent")
         removeDBfile(testMixpanel.apiToken)
@@ -51,6 +51,16 @@ class MixpanelDemoTests: MixpanelBaseTests {
                       "events should have been flushed")
         removeDBfile(testMixpanel.apiToken)
     }
+
+    func testFlushProperties() {
+        let testMixpanel = Mixpanel.initialize(token: randomId(), trackAutomaticEvents: true, flushInterval: 60)
+        XCTAssertTrue(testMixpanel.flushBatchSize == 50, "the default flush batch size is set to 50")
+        XCTAssertTrue(testMixpanel.flushInterval == 60, "flush interval is set correctly")
+        testMixpanel.flushBatchSize = 10
+        XCTAssertTrue(testMixpanel.flushBatchSize == 10, "flush batch size is set correctly")
+        testMixpanel.flushInterval = 30
+        XCTAssertTrue(testMixpanel.flushInterval == 30, "flush interval is set correctly")
+    }
 
     func testFlushPeople() {
         let testMixpanel = Mixpanel.initialize(token: randomId(), trackAutomaticEvents: true, flushInterval: 60)

Sources/Flush.swift

@@ -24,6 +24,7 @@ class Flush: AppLifecycle {
     var flushRequest: FlushRequest
     var flushOnBackground = true
     var _flushInterval = 0.0
+    var _flushBatchSize = APIConstants.batchSize
     private let flushIntervalReadWriteLock: DispatchQueue
 
     var flushInterval: Double {
@@ -41,6 +42,15 @@ class Flush: AppLifecycle {
             startFlushTimer()
         }
     }
+
+    var flushBatchSize: Int {
+        get {
+            return _flushBatchSize
+        }
+        set {
+            _flushBatchSize = newValue
+        }
+    }
 
     required init(basePathIdentifier: String) {
         self.flushRequest = FlushRequest(basePathIdentifier: basePathIdentifier)
@@ -88,7 +98,7 @@ class Flush: AppLifecycle {
     func flushQueueInBatches(_ queue: Queue, type: FlushType) {
         var mutableQueue = queue
         while !mutableQueue.isEmpty {
-            let batchSize = min(mutableQueue.count, APIConstants.batchSize)
+            let batchSize = min(mutableQueue.count, flushBatchSize)
             let range = 0..<batchSize
             let batch = Array(mutableQueue[range])
             let ids: [Int32] = batch.map { entity in

Sources/MixpanelInstance.swift

@@ -119,6 +119,19 @@ open class MixpanelInstance: CustomDebugStringConvertible, FlushDelegate, AEDele
         }
     }
 
+    /// The flushBatchSize property controls the number of events sent in a single network request to the Mixpanel server.
+    /// Batch size affects how data is flushed from the client to Mixpanel. By configuring the size of the batch, you can
+    /// optimize network usage and control how frequently the client communicates with the server.
+    open var flushBatchSize: Int {
+        get {
+            return flushInstance.flushBatchSize
+        }
+        set {
+            flushInstance.flushBatchSize = newValue
+        }
+    }
+
+
     /// The base URL used for Mixpanel API requests.
     /// Useful if you need to proxy Mixpanel requests. Defaults to
     /// https://api.mixpanel.com.
@@ -198,6 +211,7 @@ open class MixpanelInstance: CustomDebugStringConvertible, FlushDelegate, AEDele
     var optOutStatus: Bool?
     var useUniqueDistinctId: Bool
     var timedEvents = InternalProperties()
+
     let readWriteLock: ReadWriteLock
 #if os(iOS) && !targetEnvironment(macCatalyst)
     static let reachability = SCNetworkReachabilityCreateWithName(nil, "api.mixpanel.com")
@@ -928,16 +942,16 @@ extension MixpanelInstance {
             // automatic events will NOT be flushed until one of the flags is non-nil
             let eventQueue = self.mixpanelPersistence.loadEntitiesInBatch(
                 type: self.persistenceTypeFromFlushType(.events),
-                batchSize: performFullFlush ? Int.max : APIConstants.flushSize,
+                batchSize: performFullFlush ? Int.max : self.flushBatchSize,
                 excludeAutomaticEvents: !self.trackAutomaticEventsEnabled
             )
             let peopleQueue = self.mixpanelPersistence.loadEntitiesInBatch(
                 type: self.persistenceTypeFromFlushType(.people),
-                batchSize: performFullFlush ? Int.max : APIConstants.flushSize
+                batchSize: performFullFlush ? Int.max : self.flushBatchSize
             )
             let groupsQueue = self.mixpanelPersistence.loadEntitiesInBatch(
                 type: self.persistenceTypeFromFlushType(.groups),
-                batchSize: performFullFlush ? Int.max : APIConstants.flushSize
+                batchSize: performFullFlush ? Int.max : self.flushBatchSize
             )
 
             self.networkQueue.async { [weak self, completion] in
@@ -1514,4 +1528,5 @@ extension MixpanelInstance {
     func setOnce(properties: Properties) {
         people?.setOnce(properties: properties)
     }
+
 }