Add BUYStatusOperation aggregate operation and super class.

Mobile Buy SDK/Mobile Buy SDK.xcodeproj/project.pbxproj

@@ -249,6 +249,10 @@
 		9A585C0B1CE6440B001F20F0 /* BUYOperation.h in Headers */ = {isa = PBXBuildFile; fileRef = 9A585C041CE6440B001F20F0 /* BUYOperation.h */; };
 		9A585C0D1CE6440B001F20F0 /* BUYOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A585C051CE6440B001F20F0 /* BUYOperation.m */; };
 		9A6B03791CDA5D4F0054C26E /* BUYAccountCredentialsTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A6B03781CDA5D4F0054C26E /* BUYAccountCredentialsTests.m */; };
+		9A6C1D411D07485F00BFF4F9 /* BUYStatusOperation.h in Headers */ = {isa = PBXBuildFile; fileRef = 9A6C1D3F1D07485F00BFF4F9 /* BUYStatusOperation.h */; };
+		9A6C1D421D07485F00BFF4F9 /* BUYStatusOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A6C1D401D07485F00BFF4F9 /* BUYStatusOperation.m */; };
+		9A6C1D451D0749FC00BFF4F9 /* BUYAggregateOperation.h in Headers */ = {isa = PBXBuildFile; fileRef = 9A6C1D431D0749FC00BFF4F9 /* BUYAggregateOperation.h */; };
+		9A6C1D461D0749FC00BFF4F9 /* BUYAggregateOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A6C1D441D0749FC00BFF4F9 /* BUYAggregateOperation.m */; };
 		9A7652C31CF487BD00220E4B /* BUYOperationTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A7652C21CF487BD00220E4B /* BUYOperationTests.m */; };
 		9A807E841CF74EBE00023160 /* BUYClient+Address.h in Headers */ = {isa = PBXBuildFile; fileRef = 9A807E811CF74EBE00023160 /* BUYClient+Address.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		9A807E861CF74EBE00023160 /* BUYClient+Address.m in Sources */ = {isa = PBXBuildFile; fileRef = 9A807E821CF74EBE00023160 /* BUYClient+Address.m */; };
@@ -491,6 +495,10 @@
 		9A585C111CE65811001F20F0 /* BUYRequestOperation.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = BUYRequestOperation.h; sourceTree = "<group>"; };
 		9A585C121CE65811001F20F0 /* BUYRequestOperation.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = BUYRequestOperation.m; sourceTree = "<group>"; };
 		9A6B03781CDA5D4F0054C26E /* BUYAccountCredentialsTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = BUYAccountCredentialsTests.m; sourceTree = "<group>"; };
+		9A6C1D3F1D07485F00BFF4F9 /* BUYStatusOperation.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = BUYStatusOperation.h; sourceTree = "<group>"; };
+		9A6C1D401D07485F00BFF4F9 /* BUYStatusOperation.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = BUYStatusOperation.m; sourceTree = "<group>"; };
+		9A6C1D431D0749FC00BFF4F9 /* BUYAggregateOperation.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = BUYAggregateOperation.h; sourceTree = "<group>"; };
+		9A6C1D441D0749FC00BFF4F9 /* BUYAggregateOperation.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = BUYAggregateOperation.m; sourceTree = "<group>"; };
 		9A7652C21CF487BD00220E4B /* BUYOperationTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = BUYOperationTests.m; sourceTree = "<group>"; };
 		9A807E811CF74EBE00023160 /* BUYClient+Address.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "BUYClient+Address.h"; sourceTree = "<group>"; };
 		9A807E821CF74EBE00023160 /* BUYClient+Address.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "BUYClient+Address.m"; sourceTree = "<group>"; };
@@ -826,6 +834,10 @@
 		9A0B0CAB1CEDDBD80037D68F /* Aggregate */ = {
 			isa = PBXGroup;
 			children = (
+				9A6C1D431D0749FC00BFF4F9 /* BUYAggregateOperation.h */,
+				9A6C1D441D0749FC00BFF4F9 /* BUYAggregateOperation.m */,
+				9A6C1D3F1D07485F00BFF4F9 /* BUYStatusOperation.h */,
+				9A6C1D401D07485F00BFF4F9 /* BUYStatusOperation.m */,
 				9A0B0CA51CED0A860037D68F /* BUYCheckoutOperation.h */,
 				9A0B0CA61CED0A860037D68F /* BUYCheckoutOperation.m */,
 			);
@@ -1064,6 +1076,7 @@
 				84B0A7311CE10ED900253EB0 /* BUYApplePayPaymentProvider.h in Headers */,
 				9019313C1BC5B9BC00D1134E /* BUYShop.h in Headers */,
 				9019313D1BC5B9BC00D1134E /* BUYShippingRate.h in Headers */,
+				9A6C1D451D0749FC00BFF4F9 /* BUYAggregateOperation.h in Headers */,
 				9019313E1BC5B9BC00D1134E /* BUYApplePayAdditions.h in Headers */,
 				9A807E841CF74EBE00023160 /* BUYClient+Address.h in Headers */,
 				84980F531CB7616900CFAB58 /* BUYDecimalNumberTransformer.h in Headers */,
@@ -1086,6 +1099,7 @@
 				84980F331CB75C2900CFAB58 /* NSEntityDescription+BUYAdditions.h in Headers */,
 				901931491BC5B9BC00D1134E /* BUYGiftCard.h in Headers */,
 				84CD7C2E1CC65D5A00B6EE61 /* _BUYCheckoutAttribute.h in Headers */,
+				9A6C1D411D07485F00BFF4F9 /* BUYStatusOperation.h in Headers */,
 				901931501BC5B9BC00D1134E /* BUYOrder.h in Headers */,
 				84D9154C1CC03F1600D334FB /* BUYManagedObject.h in Headers */,
 				84DD12CF1CC6401400A2442D /* BUYCustomer.h in Headers */,
@@ -1303,6 +1317,7 @@
 				84D73C091CDD194D000F978A /* BUYAddress.m in Sources */,
 				901931031BC5B9BC00D1134E /* BUYOptionValue.m in Sources */,
 				84980F551CB7616900CFAB58 /* BUYDecimalNumberTransformer.m in Sources */,
+				9A6C1D421D07485F00BFF4F9 /* BUYStatusOperation.m in Sources */,
 				901931041BC5B9BC00D1134E /* BUYApplePayAdditions.m in Sources */,
 				901931061BC5B9BC00D1134E /* BUYDiscount.m in Sources */,
 				9A0B0C5D1CE662EC0037D68F /* BUYRequestOperation.m in Sources */,
@@ -1324,6 +1339,7 @@
 				84DD12C81CC63FEE00A2442D /* _BUYMaskedCreditCard.m in Sources */,
 				84DD12AC1CC63FE600A2442D /* _BUYProduct.m in Sources */,
 				84DD12A21CC63FE600A2442D /* _BUYImageLink.m in Sources */,
+				9A6C1D461D0749FC00BFF4F9 /* BUYAggregateOperation.m in Sources */,
 				841ADE1A1CB6C942000004B0 /* NSRegularExpression+BUYAdditions.m in Sources */,
 				8498DCBE1CDD1FA400BD12A8 /* BUYAccountCredentials.m in Sources */,
 				9032F2DD1BE9457A00BB9EEF /* BUYCheckoutAttribute.m in Sources */,

Mobile Buy SDK/Mobile Buy SDK/Data/BUYClient+Checkout.m

@@ -29,6 +29,7 @@
 #import "BUYClient+Routing.h"
 #import "BUYRequestOperation.h"
 #import "BUYCheckoutOperation.h"
+#import "BUYStatusOperation.h"
 #import "BUYAddress.h"
 #import "BUYCheckout.h"
 #import "BUYGiftCard.h"
@@ -104,7 +105,7 @@
 
 - (BUYOperation *)completeCheckoutWithToken:(NSString *)checkoutToken paymentToken:(id<BUYPaymentToken>)paymentToken completion:(BUYDataCheckoutBlock)block
 {
-	BUYCheckoutOperation *operation = [[BUYCheckoutOperation alloc] initWithClient:self checkoutToken:checkoutToken token:paymentToken completion:block];
+	BUYCheckoutOperation *operation = [BUYCheckoutOperation operationWithClient:self checkoutToken:checkoutToken token:paymentToken completion:block];
 	[self startOperation:operation];
 	return operation;
 }
@@ -152,6 +153,15 @@
 	}];
 }
 
+- (NSOperation *)pollCompletionStatusAndGetCheckoutWithToken:(NSString *)token start:(BOOL)start completion:(BUYDataCheckoutBlock)block
+{
+	BUYStatusOperation *operation = [BUYStatusOperation operationWithClient:self checkoutToken:token completion:block];
+	if (start) {
+		[self startOperation:operation];
+	}
+	return operation;
+}
+
 - (NSOperation *)postCheckout:(NSDictionary *)checkoutJSON completion:(BUYDataCheckoutBlock)block
 {
 	return [self postRequestForURL:[self urlForCheckouts] object:checkoutJSON completionHandler:^(NSDictionary *json, NSHTTPURLResponse *response, NSError *error) {

Mobile Buy SDK/Mobile Buy SDK/Data/BUYClient+Internal.h

@@ -35,6 +35,10 @@ typedef void (^BUYClientRequestJSONCompletion)(NSDictionary *json, NSHTTPURLResp
 
 @interface BUYClient (Internal)
 
+@property (nonatomic, strong) NSOperationQueue *requestQueue;
+
+- (NSOperation *)pollCompletionStatusAndGetCheckoutWithToken:(NSString *)token start:(BOOL)start completion:(BUYDataCheckoutBlock)block;
+
 - (NSOperation *)getRequestForURL:(NSURL *)url    completionHandler:(BUYClientRequestJSONCompletion)completionHandler;
 - (NSOperation *)deleteRequestForURL:(NSURL *)url completionHandler:(BUYClientRequestJSONCompletion)completionHandler;
 

Mobile Buy SDK/Mobile Buy SDK/Operations/BUYAggregateOperation.h

+//
+//  BUYAggregateOperation.h
+//  Mobile Buy SDK
+//
+//  Created by Shopify.
+//  Copyright (c) 2015 Shopify Inc. All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+//
+
+#import "BUYOperation.h"
+
+@interface BUYAggregateOperation : BUYOperation
+
+@property (strong, atomic) NSArray<NSOperation *> *operations;
+
++ (instancetype)operationWithQueue:(NSOperationQueue *)queue operations:(NSArray<NSOperation *> *)operations;
+- (instancetype)initWithQueue:(NSOperationQueue *)queue operations:(NSArray<NSOperation *> *)operations;
+
+- (void)finishWithObject:(id)object;
+- (void)finishWithError:(NSError *)error;
+
+@end

Mobile Buy SDK/Mobile Buy SDK/Operations/BUYAggregateOperation.m

+//
+//  BUYAggregateOperation.m
+//  Mobile Buy SDK
+//
+//  Created by Shopify.
+//  Copyright (c) 2015 Shopify Inc. All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+//
+
+#import "BUYAggregateOperation.h"
+
+@interface BUYAggregateOperation ()
+
+@property (strong, nonatomic) NSOperationQueue *queue;
+
+@end
+
+@implementation BUYAggregateOperation
+
+#pragma mark - Init -
+
++ (instancetype)operationWithQueue:(NSOperationQueue *)queue operations:(NSArray<NSOperation *> *)operations
+{
+	return [[[self class] alloc] initWithQueue:queue operations:operations];
+}
+
+- (instancetype)initWithQueue:(NSOperationQueue *)queue operations:(NSArray<NSOperation *> *)operations
+{
+	self = [super init];
+	if (self) {
+		_queue          = queue;
+		self.operations = operations;
+	}
+	return self;
+}
+
+#pragma mark - Finishing -
+
+- (void)finishWithObject:(id)object
+{
+	if (self.cancelled) {
+		return;
+	}
+	
+	[self finishExecution];
+}
+
+- (void)finishWithError:(NSError *)error
+{
+	if (self.cancelled) {
+		return;
+	}
+	
+	[self cancelAllOperations];
+	[self finishExecution];
+}
+
+#pragma mark - Execution -
+
+- (void)startExecution
+{
+	if (self.cancelled) {
+		return;
+	}
+	
+	[super startExecution];
+	
+	[self linkDependencies];
+	[self startAllOperations];
+}
+
+- (void)cancelExecution
+{
+	[super cancelExecution];
+	[self cancelAllOperations];
+}
+
+#pragma mark - Dependencies -
+
+- (void)linkDependencies
+{
+	if (self.operations.count > 1) {
+		int i = (int)self.operations.count - 1;
+		while (i > 0) {
+			NSOperation *latter = self.operations[i];
+			NSOperation *former = self.operations[i - 1];
+			
+			[latter addDependency:former];
+			i--;
+		}
+	}
+}
+
+#pragma mark - Start / Stop -
+
+- (void)startAllOperations
+{
+	for (NSOperation *operation in self.operations) {
+		[self.queue addOperation:operation];
+	}
+}
+
+- (void)cancelAllOperations
+{
+	for (NSOperation *operation in self.operations) {
+		[operation cancel];
+	}
+}
+
+@end

Mobile Buy SDK/Mobile Buy SDK/Operations/BUYCheckoutOperation.h

@@ -24,7 +24,8 @@
 //  THE SOFTWARE.
 //
 
-#import <Buy/BUYOperation.h>
+#import <Buy/BUYAggregateOperation.h>
+#import <Buy/BUYStatusOperation.h>
 NS_ASSUME_NONNULL_BEGIN
 
 @class BUYClient;
@@ -32,11 +33,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @protocol BUYPaymentToken;
 
-typedef void (^BUYCheckoutOperationCompletion)(BUYCheckout * _Nullable checkout, NSError * _Nullable error);
-
-@interface BUYCheckoutOperation : BUYOperation
-
-@property (strong, nonatomic, readonly, nonnull) BUYClient *client;
+@interface BUYCheckoutOperation : BUYAggregateOperation
 
 + (instancetype)operationWithClient:(BUYClient *)client checkoutToken:(NSString *)checkoutToken token:(id<BUYPaymentToken>)token completion:(BUYCheckoutOperationCompletion)completion;
 - (instancetype)initWithClient:(BUYClient *)client checkoutToken:(NSString *)checkoutToken token:(id<BUYPaymentToken>)token completion:(BUYCheckoutOperationCompletion)completion;

Mobile Buy SDK/Mobile Buy SDK/Operations/BUYCheckoutOperation.m

@@ -29,15 +29,15 @@
 #import "BUYClient+Internal.h"
 #import "BUYPaymentToken.h"
 #import "BUYRequestOperation.h"
+#import "BUYStatusOperation.h"
 
 @interface BUYCheckoutOperation ()
 
+@property (strong, nonatomic, readonly) BUYClient *client;
 @property (strong, nonatomic, readonly) NSString *checkoutToken;
 @property (strong, nonatomic, readonly) id<BUYPaymentToken> token;
 @property (strong, nonatomic, readonly) BUYCheckoutOperationCompletion completion;
 
-@property (strong, atomic) NSArray *operations;
-
 @end
 
 @implementation BUYCheckoutOperation
@@ -51,7 +51,7 @@
 
 - (instancetype)initWithClient:(BUYClient *)client checkoutToken:(NSString *)checkoutToken token:(id<BUYPaymentToken>)token completion:(BUYCheckoutOperationCompletion)completion
 {
-	self = [super init];
+	self = [super initWithQueue:client.requestQueue operations:nil];
 	if (self) {
 		_client        = client;
 		_token         = token;
@@ -63,25 +63,23 @@
 
 #pragma mark - Finishing -
 
-- (void)finishWithCheckout:(BUYCheckout *)checkout
+- (void)finishWithObject:(id)object
 {
+	[super finishWithObject:object];
+	
 	if (self.cancelled) {
 		return;
 	}
-	
-	[self finishExecution];
-	self.completion(checkout, nil);
+	self.completion(object, nil);
 }
 
 - (void)finishWithError:(NSError *)error
 {
+	[super finishWithError:error];
+	
 	if (self.cancelled) {
 		return;
 	}
-	
-	[self cancelAllOperations];
-	
-	[self finishExecution];
 	self.completion(nil, error);
 }
 
@@ -93,44 +91,12 @@
 		return;
 	}
 	
-	[super startExecution];
-	
-	NSOperation *beginOperation = [self createBeginOperation];
-	NSOperation *pollOperation  = [self createPollOperation];
-	NSOperation *getOperation   = [self createGetOperation];
-	
-	[pollOperation addDependency:beginOperation];
-	[getOperation addDependency:pollOperation];
-	
 	self.operations = @[
-						beginOperation,
-						pollOperation,
-						getOperation,
+						[self createBeginOperation],
+						[self createStatusOperation],
 						];
 	
-	[self startAllOperations];
-}
-
-- (void)cancelExecution
-{
-	[super cancelExecution];
-	[self cancelAllOperations];
-}
-
-#pragma mark - Start / Stop -
-
-- (void)startAllOperations
-{
-	for (BUYRequestOperation *operation in self.operations) {
-		[self.client startOperation:operation];
-	}
-}
-
-- (void)cancelAllOperations
-{
-	for (BUYRequestOperation *operation in self.operations) {
-		[operation cancel];
-	}
+	[super startExecution];
 }
 
 #pragma mark - Operations -
@@ -144,25 +110,11 @@
 	}];
 }
 
-- (NSOperation *)createPollOperation
-{
-	BUYRequestOperation *operation = (BUYRequestOperation *)[self.client getCompletionStatusOfCheckoutWithToken:self.checkoutToken start:NO completion:^(BUYStatus status, NSError *error) {
-		if (status != BUYStatusComplete) {
-			[self finishWithError:error];
-		}
-	}];
-	operation.pollingHandler = ^BOOL (NSDictionary *json, NSHTTPURLResponse *response, NSError *error) {
-		return response.statusCode == BUYStatusProcessing;
-	};
-	
-	return operation;
-}
-
-- (NSOperation *)createGetOperation
+- (NSOperation *)createStatusOperation
 {
-	return [self.client getCheckoutWithToken:self.checkoutToken start:NO completion:^(BUYCheckout *checkout, NSError *error) {
+	return [self.client pollCompletionStatusAndGetCheckoutWithToken:self.checkoutToken start:NO completion:^(BUYCheckout *checkout, NSError *error) {
 		if (checkout) {
-			[self finishWithCheckout:checkout];
+			[self finishWithObject:checkout];
 		} else {
 			[self finishWithError:error];
 		}

Mobile Buy SDK/Mobile Buy SDK/Operations/BUYStatusOperation.h

+//
+//  BUYStatusOperation.h
+//  Mobile Buy SDK
+//
+//  Created by Shopify.
+//  Copyright (c) 2015 Shopify Inc. All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+//
+
+#import "BUYAggregateOperation.h"
+NS_ASSUME_NONNULL_BEGIN
+
+@class BUYCheckout;
+@class BUYClient;
+
+typedef void (^BUYCheckoutOperationCompletion)(BUYCheckout * _Nullable checkout, NSError * _Nullable error);
+
+@interface BUYStatusOperation : BUYAggregateOperation
+
++ (instancetype)operationWithClient:(BUYClient *)client checkoutToken:(NSString *)checkoutToken completion:(BUYCheckoutOperationCompletion)completion;
+- (instancetype)initWithClient:(BUYClient *)client checkoutToken:(NSString *)checkoutToken completion:(BUYCheckoutOperationCompletion)completion;
+
+@end
+
+NS_ASSUME_NONNULL_END

Mobile Buy SDK/Mobile Buy SDK/Operations/BUYStatusOperation.m

+//
+//  BUYStatusOperation.m
+//  Mobile Buy SDK
+//
+//  Created by Shopify.
+//  Copyright (c) 2015 Shopify Inc. All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+//
+
+#import "BUYStatusOperation.h"
+#import "BUYClient+Checkout.h"
+#import "BUYClient+Internal.h"
+#import "BUYRequestOperation.h"
+
+@interface BUYStatusOperation ()
+
+@property (strong, nonatomic, readonly) BUYClient *client;
+@property (strong, nonatomic, readonly) NSString *checkoutToken;
+@property (strong, nonatomic, readonly) BUYCheckoutOperationCompletion completion;
+
+@end
+
+@implementation BUYStatusOperation
+
+#pragma mark - Init -
+
++ (instancetype)operationWithClient:(BUYClient *)client checkoutToken:(NSString *)checkoutToken completion:(BUYCheckoutOperationCompletion)completion
+{
+	return [[[self class] alloc] initWithClient:client checkoutToken:checkoutToken completion:completion];
+}
+
+- (instancetype)initWithClient:(BUYClient *)client checkoutToken:(NSString *)checkoutToken completion:(BUYCheckoutOperationCompletion)completion
+{
+	self = [super initWithQueue:client.requestQueue operations:nil];
+	if (self) {
+		_client        = client;
+		_completion    = completion;
+		_checkoutToken = checkoutToken;
+	}
+	return self;
+}
+
+#pragma mark - Execution -
+
+- (void)startExecution
+{
+	if (self.cancelled) {
+		return;
+	}
+	
+	self.operations = @[
+						[self createPollOperation],
+						[self createGetOperation],
+						];
+	
+	[super startExecution];
+}
+
+#pragma mark - Finishing -
+
+- (void)finishWithObject:(id)object
+{
+	[super finishWithObject:object];
+	
+	if (self.cancelled) {
+		return;
+	}
+	self.completion(object, nil);
+}
+
+- (void)finishWithError:(NSError *)error
+{
+	[super finishWithError:error];
+	
+	if (self.cancelled) {
+		return;
+	}
+	self.completion(nil, error);
+}
+
+#pragma mark - Operations -
+
+- (NSOperation *)createPollOperation
+{
+	BUYRequestOperation *operation = (BUYRequestOperation *)[self.client getCompletionStatusOfCheckoutWithToken:self.checkoutToken start:NO completion:^(BUYStatus status, NSError *error) {
+		if (status != BUYStatusComplete) {
+			[self finishWithError:error];
+		}
+	}];
+	operation.pollingHandler = ^BOOL (NSDictionary *json, NSHTTPURLResponse *response, NSError *error) {
+		return response.statusCode == BUYStatusProcessing;
+	};
+	
+	return operation;
+}
+
+- (NSOperation *)createGetOperation
+{
+	return [self.client getCheckoutWithToken:self.checkoutToken start:NO completion:^(BUYCheckout *checkout, NSError *error) {
+		if (checkout) {
+			[self finishWithObject:checkout];
+		} else {
+			[self finishWithError:error];
+		}
+	}];
+}
+
+@end