SDK 2302 update singleton creation to dispatch once

Branch-TestBed/Branch-SDK-Tests/BNCEncodingUtilsTests.m

@@ -291,8 +291,8 @@ - (void)testDecodeQueryStringToDictionary {
 #pragma mark - Test Util methods
 
 - (NSString *)stringForDate:(NSDate *)date {
-    static NSDateFormatter *dateFormatter;
-    static dispatch_once_t onceToken;
+    static NSDateFormatter *dateFormatter = nil;
+    static dispatch_once_t onceToken = 0;
 
     dispatch_once(&onceToken, ^{
         dateFormatter = [[NSDateFormatter alloc] init];

Sources/BranchSDK/BNCAppGroupsData.m

@@ -18,8 +18,8 @@ @interface BNCAppGroupsData()
 @implementation BNCAppGroupsData
 
 + (instancetype)shared {
-    static BNCAppGroupsData *appGroupsData;
-    static dispatch_once_t onceToken;
+    static BNCAppGroupsData *appGroupsData = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         appGroupsData = [BNCAppGroupsData new];
     });

Sources/BranchSDK/BNCAppleReceipt.m

@@ -23,8 +23,8 @@ @interface BNCAppleReceipt()
 @implementation BNCAppleReceipt
 
 + (BNCAppleReceipt *)sharedInstance {
-    static BNCAppleReceipt *singleton;
-    static dispatch_once_t onceToken;
+    static BNCAppleReceipt *singleton = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         singleton = [BNCAppleReceipt new];
     });

Sources/BranchSDK/BNCCallbackMap.m

@@ -15,8 +15,8 @@ @interface BNCCallbackMap()
 @implementation BNCCallbackMap
 
 + (instancetype)shared {
-    static BNCCallbackMap *map;
-    static dispatch_once_t onceToken;
+    static BNCCallbackMap *map = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         map = [BNCCallbackMap new];
     });

Sources/BranchSDK/BNCDeviceInfo.m

@@ -34,7 +34,7 @@ @interface BNCDeviceInfo()
 @implementation BNCDeviceInfo
 
 + (BNCDeviceInfo *)getInstance {
-    static BNCDeviceInfo *bnc_deviceInfo = 0;
+    static BNCDeviceInfo *bnc_deviceInfo = nil;
     static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         bnc_deviceInfo = [BNCDeviceInfo new];

Sources/BranchSDK/BNCEncodingUtils.m

@@ -129,9 +129,8 @@ + (NSString *)sha256Encode:(NSString *)input {
 #pragma mark - Param Encoding methods
 
 + (NSString *)iso8601StringFromDate:(NSDate *)date {
-    static NSDateFormatter *dateFormatter;
-    static dispatch_once_t onceToken;
-
+    static NSDateFormatter *dateFormatter = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         dateFormatter = [[NSDateFormatter alloc] init];
         [dateFormatter setLocale:[NSLocale localeWithLocaleIdentifier:@"en_US_POSIX"]]; // POSIX to avoid weird issues

Sources/BranchSDK/BNCEventUtils.m

@@ -15,8 +15,8 @@
 @implementation BNCEventUtils
 
 + (instancetype)shared {
-    static BNCEventUtils *set;
-    static dispatch_once_t onceToken;
+    static BNCEventUtils *set = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         set = [BNCEventUtils new];
     });

Sources/BranchSDK/BNCKeyChain.m

@@ -149,9 +149,9 @@
 
 // The security access group string is prefixed with the Apple Developer Team ID
 + (NSString * _Nullable)securityAccessGroup {
-    @synchronized(self) {
-        static NSString *_securityAccessGroup = nil;
-        if (_securityAccessGroup) return _securityAccessGroup;
+    static NSString *_securityAccessGroup = nil;
+    static dispatch_once_t onceToken = 0;
+    dispatch_once(&onceToken, ^{
 
         // The keychain cannot be empty prior to requesting the security access group string. Add a tmp variable.
         NSError *error = [self storeDate:[NSDate date] forService:@"BranchKeychainService" key:@"Temp" cloudAccessGroup:nil];
@@ -168,18 +168,23 @@
         };
         CFDictionaryRef resultDictionary = NULL;
         OSStatus status = SecItemCopyMatching((__bridge CFDictionaryRef)dictionary, (CFTypeRef*)&resultDictionary);
-        if (status == errSecItemNotFound) return nil;
+
+        if (status == errSecItemNotFound) { 
+            return;
+        }
         if (status != errSecSuccess) {
             [[BranchLogger shared] logWarning:[NSString stringWithFormat:@"Failed to retrieve security access group"] error:[self errorWithKey:nil OSStatus:status]];
-            return nil;
+            return;
         }
         NSString *group = [(__bridge NSDictionary *)resultDictionary objectForKey:(__bridge NSString *)kSecAttrAccessGroup];
         if (group.length > 0) {
             _securityAccessGroup = [group copy];
         }
         CFRelease(resultDictionary);
-        return _securityAccessGroup;
-    }
+    });
+
+    return _securityAccessGroup;
+
 }
 
 @end

Sources/BranchSDK/BNCPartnerParameters.m

@@ -16,8 +16,8 @@ @interface BNCPartnerParameters()
 @implementation BNCPartnerParameters
 
 + (instancetype)shared {
-    static BNCPartnerParameters *partnerParameters;
-    static dispatch_once_t onceToken;
+    static BNCPartnerParameters *partnerParameters = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         partnerParameters = [BNCPartnerParameters new];
     });

Sources/BranchSDK/BNCPasteboard.m

@@ -13,8 +13,8 @@
 @implementation BNCPasteboard
 
 + (BNCPasteboard *)sharedInstance {
-    static BNCPasteboard *pasteboard;
-    static dispatch_once_t onceToken;
+    static BNCPasteboard *pasteboard = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         pasteboard = [BNCPasteboard new];
     });

Sources/BranchSDK/BNCPreferenceHelper.m

@@ -122,8 +122,8 @@ @implementation BNCPreferenceHelper
     adUserDataUsageConsent = _adUserDataUsageConsent;
 
 + (BNCPreferenceHelper *)sharedInstance {
-    static BNCPreferenceHelper *preferenceHelper;
-    static dispatch_once_t onceToken;
+    static BNCPreferenceHelper *preferenceHelper = nil;
+    static dispatch_once_t onceToken = 0;
 
     dispatch_once(&onceToken, ^{
         preferenceHelper = [[BNCPreferenceHelper alloc] init];

Sources/BranchSDK/BNCQRCodeCache.m

@@ -16,8 +16,8 @@ @implementation BNCQRCodeCache
 
 //Can only hold one QR code in cache. Just used to debounce.
 + (BNCQRCodeCache *) sharedInstance {
-    static BNCQRCodeCache *singleton;
-    static dispatch_once_t onceToken;
+    static BNCQRCodeCache *singleton = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         singleton = [BNCQRCodeCache new];
     });

Sources/BranchSDK/BNCReachability.m

@@ -28,8 +28,8 @@ @interface BNCReachability()
 @implementation BNCReachability
 
 + (BNCReachability *)shared {
-    static BNCReachability *reachability;
-    static dispatch_once_t onceToken;
+    static BNCReachability *reachability = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         reachability = [BNCReachability new];
     });

Sources/BranchSDK/BNCSKAdNetwork.m

@@ -27,8 +27,8 @@ @interface BNCSKAdNetwork()
 @implementation BNCSKAdNetwork
 
 + (BNCSKAdNetwork *)sharedInstance {
-    static BNCSKAdNetwork *singleton;
-    static dispatch_once_t onceToken;
+    static BNCSKAdNetwork *singleton = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         singleton = [[BNCSKAdNetwork alloc] init];
     });

Sources/BranchSDK/BNCServerAPI.m

@@ -14,8 +14,8 @@
 @implementation BNCServerAPI
 
 + (BNCServerAPI *)sharedInstance {
-    static BNCServerAPI *serverAPI;
-    static dispatch_once_t onceToken;
+    static BNCServerAPI *serverAPI = nil;
+    static dispatch_once_t onceToken = 0;
 
     dispatch_once(&onceToken, ^{
         serverAPI = [[BNCServerAPI alloc] init];

Sources/BranchSDK/BNCServerRequestQueue.m

@@ -340,7 +340,7 @@ - (id)unarchiveObjectFromData:(NSData *)data {
 // only replay analytics requests, the others are time sensitive
 + (NSSet<Class> *)replayableRequestClasses {
     static NSSet<Class> *requestClasses = nil;
-    static dispatch_once_t onceToken;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^ {
         NSArray *tmp = @[
             [BranchOpenRequest class],
@@ -356,7 +356,7 @@ - (id)unarchiveObjectFromData:(NSData *)data {
 // encodable classes also includes NSArray and NSData
 + (NSSet<Class> *)encodableClasses {
     static NSSet<Class> *classes = nil;
-    static dispatch_once_t onceToken;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^ {
         NSMutableArray *tmp = [NSMutableArray new];
         [tmp addObject:[NSArray class]]; // root object
@@ -373,7 +373,7 @@ - (id)unarchiveObjectFromData:(NSData *)data {
 
 + (NSURL * _Nonnull) URLForQueueFile {
     static NSURL *URL = nil;
-    static dispatch_once_t onceToken;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^ {
         URL = BNCURLForBranchDirectory();
         URL = [URL URLByAppendingPathComponent:BRANCH_QUEUE_FILE isDirectory:NO];
@@ -383,7 +383,7 @@ + (NSURL * _Nonnull) URLForQueueFile {
 
 + (instancetype)getInstance {
     static BNCServerRequestQueue *sharedQueue = nil;
-    static dispatch_once_t onceToken;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^ {
         sharedQueue = [[BNCServerRequestQueue alloc] init];
         [sharedQueue retrieve];

Sources/BranchSDK/BNCUserAgentCollector.m

@@ -26,8 +26,8 @@ @interface BNCUserAgentCollector()
 @implementation BNCUserAgentCollector
 
 + (BNCUserAgentCollector *)instance {
-    static BNCUserAgentCollector *collector;
-    static dispatch_once_t onceToken;
+    static BNCUserAgentCollector *collector = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         collector = [BNCUserAgentCollector new];
     });

Sources/BranchSDK/BranchContentDiscoverer.m

@@ -27,12 +27,11 @@ @implementation BranchContentDiscoverer
 
 + (BranchContentDiscoverer *)getInstance {
     static BranchContentDiscoverer *sharedInstance = nil;
-    @synchronized (self) {
-        if (!sharedInstance) {
-            sharedInstance = [[BranchContentDiscoverer alloc] init];
-        }
+    static dispatch_once_t onceToken = 0;
+    dispatch_once(&onceToken, ^{
+        sharedInstance = [BranchContentDiscoverer new];
+    });
     return sharedInstance;
-    }
 }
 
 - (void) dealloc {

Sources/BranchSDK/BranchContentDiscoveryManifest.m

@@ -34,13 +34,12 @@ - (instancetype)init {
 }
 
 + (BranchContentDiscoveryManifest *)getInstance {
-    @synchronized (self) {
-        static BranchContentDiscoveryManifest *contentDiscoveryManifest = nil;
-        if (!contentDiscoveryManifest) {
-            contentDiscoveryManifest = [[BranchContentDiscoveryManifest alloc] init];
-        }
-        return contentDiscoveryManifest;
-    }
+    static BranchContentDiscoveryManifest *sharedInstance = nil;
+    static dispatch_once_t onceToken = 0;
+    dispatch_once(&onceToken, ^{
+        sharedInstance = [BranchContentDiscoveryManifest new];
+    });
+    return sharedInstance;
 }
 
 - (void)onBranchInitialised:(NSDictionary *)branchInitDict withUrl:(NSString *)referringURL {

Sources/BranchSDK/BranchJsonConfig.m

@@ -28,16 +28,13 @@ @interface BranchJsonConfig()
 
 @implementation BranchJsonConfig
 
-+ (BranchJsonConfig * _Nonnull)instance
-{
-    @synchronized(self) {
-        static BranchJsonConfig *_instance;
-        static dispatch_once_t once = 0;
-        dispatch_once(&once, ^{
-            _instance = [[BranchJsonConfig alloc] init];
-        });
-        return _instance;
-    }
++ (BranchJsonConfig * _Nonnull)instance {
+    static BranchJsonConfig *instance = nil;
+    static dispatch_once_t once = 0;
+    dispatch_once(&once, ^{
+        instance = [BranchJsonConfig new];
+    });
+    return instance;
 }
 
 - (instancetype)init

Sources/BranchSDK/BranchLogger.m

@@ -31,7 +31,7 @@ - (instancetype)init {
 
 + (instancetype)shared {
     static BranchLogger *sharedInstance = nil;
-    static dispatch_once_t onceToken;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         sharedInstance = [[BranchLogger alloc] init];
         sharedInstance.loggingEnabled = NO;

Sources/BranchSDK/BranchPluginSupport.m

@@ -16,8 +16,8 @@
 @implementation BranchPluginSupport
 
 + (BranchPluginSupport *)instance {
-    static BranchPluginSupport *pluginSupport;
-    static dispatch_once_t onceToken;
+    static BranchPluginSupport *pluginSupport = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         pluginSupport = [BranchPluginSupport new];
     });

Sources/BranchSDK/BranchScene.m

@@ -13,8 +13,8 @@
 @implementation BranchScene
 
 + (BranchScene *)shared NS_EXTENSION_UNAVAILABLE("BranchScene does not support Extensions") {
-    static BranchScene *bscene;
-    static dispatch_once_t onceToken;
+    static BranchScene *bscene = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         bscene = [BranchScene new];
     });

Sources/BranchSDK/NSError+Branch.m

@@ -22,8 +22,8 @@ + (NSString *)bncErrorDomain {
 
 // Legacy error messages
 + (NSString *)messageForCode:(BNCErrorCode)code {
-    static NSMutableDictionary<NSNumber *, NSString *> *messages;
-    static dispatch_once_t onceToken;
+    static NSMutableDictionary<NSNumber *, NSString *> *messages = nil;
+    static dispatch_once_t onceToken = 0;
     dispatch_once(&onceToken, ^{
         messages = [NSMutableDictionary<NSNumber *, NSString *> new];
         [messages setObject:@"The Branch user session has not been initialized." forKey:@(BNCInitError)];