Added isDatafileCached flag.

Author: alda-optimizely

OptimizelySDKDatafileManager/OptimizelySDKDatafileManager/OPTLYDatafileManager.h

@@ -24,6 +24,8 @@
 
 /// The time interval to regularly fetch the datafile.
 @property (nonatomic, readonly) NSTimeInterval datafileFetchInterval;
+/// This flag specifies if the datafile has been cached or not.
+@property (nonatomic, assign) BOOL isDatafileCached;
 /// The project ID of the datafile this datafile manager will monitor
 @property (nonatomic, readonly, strong, nonnull) NSString *projectId;
 /// The error handler to be used for the manager, client, and all subcomponents

OptimizelySDKDatafileManager/OptimizelySDKDatafileManager/OPTLYDatafileManager.m

@@ -15,8 +15,8 @@
  ***************************************************************************/
 
 #import <UIKit/UIKit.h>
-#import <OptimizelySDKCore/OPTLYLog.h>
 #import <OptimizelySDKCore/OPTLYErrorHandler.h>
+#import <OptimizelySDKCore/OPTLYLog.h>
 #import <OptimizelySDKShared/OPTLYDataStore.h>
 #import <OptimizelySDKShared/OPTLYNetworkService.h>
 #import "OPTLYDatafileManager.h"
@@ -64,21 +64,21 @@ - (void)downloadDatafile:(NSString *)projectId completionHandler:(OPTLYHTTPReque
     OPTLYLogInfo(@"Downloading datafile: %@", projectId);
     [self.networkService downloadProjectConfig:self.projectId
                              completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
-                                 if (error != nil) {
-                                     [self.errorHandler handleError:error];
-                                 }
-                                 else if ([(NSHTTPURLResponse *)response statusCode] == 200) { // got datafile OK
-                                     [self saveDatafile:data];
-                                     OPTLYLogInfo(@"Datafile for project ID %@ downloaded. Saving datafile.");
-                                 }
-                                 else {
-                                     // TODO: Josh W. handle bad response
-                                 }
-                                 // call the completion handler
-                                 if (completion != nil) {
-                                     completion(data, response, error);
-                                 }
-                             }];
+         if (error != nil) {
+             [self.errorHandler handleError:error];
+         }
+         else if ([(NSHTTPURLResponse *)response statusCode] == 200) { // got datafile OK
+             [self saveDatafile:data];
+             OPTLYLogInfo(@"Datafile for project ID %@ downloaded. Saving datafile.");
+         }
+         else {
+             // TODO: Josh W. handle bad response
+         }
+         // call the completion handler
+         if (completion != nil) {
+             completion(data, response, error);
+         }
+     }];
 }
 
 - (void)downloadDatafile {
@@ -94,6 +94,11 @@ - (void)saveDatafile:(NSData *)datafile {
 
 }
 
+- (BOOL)isDatafileCached {
+    BOOL isCached = [self.dataStore fileExists:self.projectId type:OPTLYDataStoreDataTypeDatafile];
+    return isCached;
+}
+
 #pragma mark - Application Lifecycle Handlers
 - (void)setupApplicationNotificationHandlers {
     NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];

OptimizelySDKDatafileManager/OptimizelySDKDatafileManagerTests/OPTLYDatafileManagerTest.m

@@ -203,4 +203,22 @@ - (void)testNetworkTimerIsDisabled
     XCTAssertFalse(datafileManager.datafileDownloadTimer.valid, @"Timer should not be valid.");
 }
 
+- (void)testIsDatafileCachedFlag
+{
+    // setup datafile manager and datastore
+    OPTLYDatafileManager *datafileManager = [OPTLYDatafileManager initWithBuilderBlock:^(OPTLYDatafileManagerBuilder * _Nullable builder) {
+        builder.projectId = kProjectId;
+    }];
+    
+    XCTAssertFalse(datafileManager.isDatafileCached, @"Datafile cached flag should be false.");
+    
+    // get the datafile
+    NSData *datafile = [OPTLYTestHelper loadJSONDatafileIntoDataObject:kDatamodelDatafileName];
+    
+    // save the datafile
+    [datafileManager saveDatafile:datafile];
+    
+    XCTAssertTrue(datafileManager.isDatafileCached, @"Datafile cached flag should be true.");
+}
+
 @end