@class NSDate, CKServerChangeToken, NSObject, NSString, CKNotificationListener, CKDatabase, CKAssetDownloadStagingManager, NSOperationQueue, NSArray, CKSyncEngineDataSourceAdapter, CKSyncEngineState, CKAccountInfo, CKCoalescer;
@protocol CKSyncEngineAsyncDelegate, CKSyncEngineDataSource, OS_xpc_object, CKSyncEngineDelegateInternal, OS_dispatch_queue;

@interface CKSyncEngine : NSObject {
    BOOL _ignoringSystemConditions;
    BOOL _useUniqueActivityIdentifiers;
    unsigned long long _lastNotifiedStateChangeCount;
    NSObject<OS_dispatch_queue> *_queue;
    unsigned long long _maxRecordBytesPerBatch;
    id /* block */ _updateStateBlock;
}

@property (class, nonatomic) BOOL fastErrorRetry;

@property (copy, nonatomic) CKServerChangeToken *serverChangeTokenForDatabase;
@property (readonly, nonatomic) BOOL hasPendingModifications;
@property (readonly, weak, nonatomic) id<CKSyncEngineDataSource> dataSource;
@property (readonly, nonatomic) NSArray *recordIDsToSave;
@property (readonly, nonatomic) NSArray *recordIDsToDelete;
@property (retain) id<CKSyncEngineAsyncDelegate> asyncDelegate;
@property (weak, nonatomic) id<CKSyncEngineDelegateInternal> internalDelegate;
@property (retain) CKSyncEngineDataSourceAdapter *dataSourceAdapter;
@property (retain) CKSyncEngineState *state;
@property (retain) CKNotificationListener *notificationListener;
@property (readonly, nonatomic) NSOperationQueue *operationQueue;
@property (retain, nonatomic) NSString *apsMachServiceName;
@property (retain, nonatomic) CKCoalescer *accountChangeCoalescer;
@property (retain, nonatomic) CKCoalescer *schedulerSubmitCoalescer;
@property (retain, nonatomic) CKCoalescer *pushSyncCoalescer;
@property (readonly, nonatomic) NSObject<OS_dispatch_queue> *callbackQueue;
@property (readonly, nonatomic) unsigned long long maxRecordCountPerBatch;
@property unsigned long long maxZoneCountPerBatch;
@property (readonly, nonatomic) NSObject<OS_xpc_object> *xpcActivityCriteriaOverrides;
@property (nonatomic, getter=isWaitingForIdentityUpdate) BOOL waitingForIdentityUpdate;
@property (nonatomic, getter=isWaitingForHSA2) BOOL waitingForHSA2;
@property (retain, nonatomic) CKAccountInfo *lastKnownAccountInfo;
@property (readonly, nonatomic) long long priority;
@property (readonly, nonatomic) NSString *databaseSubscriptionIDOverride;
@property (readonly, nonatomic) BOOL continueModifyingPendingChangesAfterFailure;
@property (readonly, nonatomic) BOOL allowFetchAndModifyConcurrently;
@property (retain, nonatomic) NSDate *earliestStartDateForSchedulerActivities;
@property (retain, nonatomic) NSDate *lastForegroundTriggeredFetchDate;
@property (retain) CKAssetDownloadStagingManager *assetDownloadStagingManager;
@property (copy) NSString *loggingID;
@property (copy) NSDate *stateTelemetrySubmissionDate;
@property (weak) id boxedSyncEngine;
@property (getter=isAutomaticSyncingEnabled) BOOL automaticSyncingEnabled;
@property BOOL useOpportunisticPushTopic;
@property BOOL needsToReloadAccount;
@property (readonly) CKDatabase *database;

+ (void)unregisterActivitiesWithDatabase:(id)a0 ignoringSystemConditions:(BOOL)a1;
+ (id)defaultOperationGroup;
+ (BOOL)_isFetchChangesErrorAdopterVisible:(id)a0;
+ (void)populateLoggingIDsForSyncEngines:(id)a0;
+ (id)defaultManualOperationGroupNameWithType:(id)a0 scope:(id)a1;
+ (id)syncActivityIdentifierInDatabase:(id)a0 ignoringSystemConditions:(BOOL)a1;
+ (BOOL)shouldDeferAfterError:(id)a0;
+ (id)_oldAdopterVisibleFetchChangesErrorForZoneID:(id)a0 error:(id)a1;
+ (id)earliestStartDateAfterError:(id)a0;
+ (void)addKnownEngine:(id)a0;

- (void)scheduleSyncIfNecessaryAfterError:(id)a0 completionHandler:(id /* block */)a1;
- (void)performSyncWithOperationGroup:(id)a0 completionHandler:(id /* block */)a1;
- (id)stateTelemetryPayloadWithByteCount:(long long)a0;
- (BOOL)_queue_shouldFetchChangesWithOptions:(id)a0;
- (id)init;
- (void)postEvent:(id)a0;
- (void)nextBatchOfRecordsToModifyForContext:(id)a0 completionHandler:(id /* block */)a1;
- (void)relatedApplicationBundleIdentifiersForPendingWorkWithCompletionHandler:(id /* block */)a0;
- (void)dealloc;
- (void)addRecordIDsToSave:(id)a0 recordIDsToDelete:(id)a1;
- (id)redactedDescription;
- (id)redactedContainerIdentifierIfNecessaryFromContainerID:(id)a0;
- (BOOL)_queue_lastSyncWasLongAgo;
- (void)nonCoalescedScheduleSync;
- (void)setServerChangeToken:(id)a0 forRecordZoneID:(id)a1;
- (BOOL)_queue_shouldScheduleSyncActivity;
- (id)databaseSubscriptionWithID:(id)a0;
- (id)initWithDeprecatedConfiguration:(id)a0;
- (id)configurationTelemetryPayload;
- (id)defaultDatabaseSubscriptionID;
- (void)registerForApplicationLifecycleEvents;
- (void)performAsyncDelegateCallbackWithDescription:(id)a0 block:(id /* block */)a1;
- (void)sendChangesWithOptions:(id)a0 completionHandler:(id /* block */)a1;
- (id)existingOperationToModifyPendingChangesWithOptions:(id)a0 includingExecutingOperations:(BOOL)a1;
- (void)fetchChangesWithCompletionHandler:(id /* block */)a0;
- (BOOL)shouldScheduleSyncActivity;
- (void)submitActivityIfNecessaryWithIdentifier:(id)a0 earliestStartDate:(id)a1 priority:(long long)a2 userRequestedBackupTask:(BOOL)a3 relatedApplicationBundleIdentifiers:(id)a4 completionHandler:(id /* block */)a5;
- (void)scheduleSyncWithEarliestStartDate:(id)a0 completionHandler:(id /* block */)a1;
- (void)_sendChangesWithContext:(id)a0 osActivity:(id)a1 completionHandler:(id /* block */)a2;
- (id)databaseSubscription;
- (void)setHasPendingModifications;
- (void)relatedApplicationBundleIdentifiersForZoneIDs:(id)a0 recordIDs:(id)a1 completionHandler:(id /* block */)a2;
- (void)setNeedsToSaveRecordZones:(id)a0 needsToSave:(BOOL)a1;
- (BOOL)isAccountReadyToSync:(id)a0 unreadyDescription:(id *)a1;
- (void)applicationWillEnterForeground;
- (void)cancelPendingOperationsWithCompletionHandler:(id /* block */)a0;
- (BOOL)shouldSendTelemetry;
- (void)performCoalescedPushSync;
- (void)handleAccountChangeNotification;
- (void)sendChangesWithCompletionHandler:(id /* block */)a0;
- (void)coalescedScheduleSync;
- (void)setNeedsToDeleteRecords:(id)a0 needsToDelete:(BOOL)a1;
- (void)cancelOperationsWithCompletionHandler:(id /* block */)a0;
- (void)saveSubscriptionIfNecessaryWithCompletionHandler:(id /* block */)a0;
- (void)setNeedsToFetchChanges;
- (id)description;
- (void)didReceiveDatabaseNotification:(id)a0;
- (BOOL)allowFetchAndModifyConcurrentlyForContainerID:(id)a0;
- (void)addRecordZonesToSave:(id)a0 recordZoneIDsToDelete:(id)a1;
- (BOOL)isReadyToSubmitSchedulerActivity;
- (id)serverChangeTokenForRecordZoneID:(id)a0;
- (void)modifyPendingChangesInZoneIDs:(id)a0 completionHandler:(id /* block */)a1;
- (void)removeRecordZonesToSave:(id)a0 recordZoneIDsToDelete:(id)a1;
- (void)updateAccountInfoWithCompletionHandler:(id /* block */)a0;
- (id)initWithConfiguration:(id)a0;
- (void)accountChangedNotification:(id)a0;
- (void)fetchChangesForZoneIDs:(id)a0 completionHandler:(id /* block */)a1;
- (id)syncActivityIdentifier;
- (void).cxx_destruct;
- (void)setNeedsToSaveRecords:(id)a0 needsToSave:(BOOL)a1;
- (void)identityUpdateNotification:(id)a0;
- (BOOL)shouldFetchChangesWithOptions:(id)a0;
- (void)setNeedsToDeleteRecordZones:(id)a0 needsToDelete:(BOOL)a1;
- (void)postWillEnqueueOperation:(id)a0;
- (void)_fetchChangesWithContext:(id)a0 osActivity:(id)a1 completionHandler:(id /* block */)a2;
- (void)fetchChangesWithOptions:(id)a0 completionHandler:(id /* block */)a1;
- (void)removeRecordIDsToSave:(id)a0 recordIDsToDelete:(id)a1;
- (void)shareAcceptedNotification:(id)a0;
- (void)modifyPendingChangesWithCompletionHandler:(id /* block */)a0;
- (id)existingOperationToFetchChangesWithOptions:(id)a0 includingExecutingOperations:(BOOL)a1;
- (void)coalescePushSyncIfNecessary;
- (void)fixConfigurationInOperationGroup:(id)a0;
- (void)sendStateTelemetryIfNecessaryWithByteCount:(unsigned long long)a0;
- (void)sendConfigurationTelemetry;
- (BOOL)hasSchedulerActivityWithIdentifier:(id)a0;
- (id)userRequestedBackupActivityIdentifier;
- (void)updateStateAndNotifyDatasourceIfNecessaryForUserRecordID:(id)a0;
- (void)scheduleSync;
- (id)defaultDatabaseSubscription;
- (void)unregisterActivities;
- (void)networkAttributionBundleIDForZoneIDs:(id)a0 recordIDs:(id)a1 completionHandler:(id /* block */)a2;

@end