AGResponse.m

@protocol AGResponse <NSObject>

// Array of unmarshaled objects
@property (readonly, nonatomic) NSArray* objects;
@property (readonly, nonatomic) BOOL hasPrevious;
@property (readonly, nonatomic) BOOL hasNext;

@optional
-(void)next:(void (^)(id<AGResponse> response))success failure:(void (^)(NSError *error))failure;
-(void)previous:(void (^)(id<AGResponse> response))success failure:(void (^)(NSError *error))failure;

@end

usage.m

[pipe read:^(id<AGResponse> response) {
    if(response.hasNext) {
        [response next:^(id<AGResponse> response) {
            
        } failure:^(NSError* error) {
            
        }];
    }
} failure:^(NSError* error) {
    
}];