并行执行多个 NSOperations

Question

我的项目中的各个类中有几种方法，例如 methodA()、methodB()、methodC()...methodZ()。每个方法都使用 NSOperation 执行网络调用。在某些情况下，我必须并行执行方法，例如方法 A、D、M 应该并行执行。在另一种情况下，方法 D、S、T 应该并行执行。我在 APIManager 类中维护一个通用方法，它执行我的所有方法。

我尝试在 APIManager 类中创建一个操作队列，但它不起作用。只有在一个方法执行完成后，才会发生另一个方法执行。任何人都可以在这方面提出建议吗？

-(void) methodA {

NSString *path = [NSString stringWithFormat:kPath, @“Function1”];

NSString *requestXML = [NSString stringWithFormat:kGetFunction1RequestXML];

self.operation = [self.apiMgr requestWithPath:path method:@"POST" xml:requestXML headers:@{@"Accept": @"application/xml", @"Content-Type": @"application/xml"}

                                      success:^(id response) {

                                          NSLog(@“Request successful. Do further handling”);                                              
                                      }

                                      failure:^(NSError *error) {
                                          NSLog(@“failed”);                                              
                                      }];

}

-(void) 方法B {

NSString *path = [NSString stringWithFormat:kPath, @“Function2”];

NSString *requestXML = [NSString stringWithFormat:kGetFunction2RequestXML];

self.operation = [self.apiMgr requestWithPath:path method:@"POST" xml:requestXML headers:@{@"Accept": @"application/xml", @"Content-Type": @"application/xml"}

                                      success:^(id response) {

                                          NSLog(@“Request successful. Do further handling”);                                              
                                      }

                                      failure:^(NSError *error) {
                                          NSLog(@“failed”);                                              
                                      }];

}

- (id)requestWithPath:(NSString *)path method:(NSString *)method xml:(NSString *)requestXML headers:(NSDictionary *)headers success:(void(^)(id response))success failure:(void(^)(NSError *error))failure

{

NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@“%@, self.serverAddress]];

AFHTTPClient *client = [AFHTTPClient clientWithBaseURL:url];

if (headers) {
    for (NSString *header in headers) {
        [client setDefaultHeader:header value:headers[header]];
    }
}

[client setParameterEncoding:AFJSONParameterEncoding];

NSMutableURLRequest *request = nil;

request = [client requestWithMethod:method path:path parameters:nil];

[request setHTTPBody:[requestXML dataUsingEncoding:NSUTF8StringEncoding]];

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[self.operationQueue addOperation:operation];

[operation setAuthenticationAgainstProtectionSpaceBlock:^BOOL(NSURLConnection *connection, NSURLProtectionSpace *protectionSpace)
 {
     return YES;
 }];

[operation setAuthenticationChallengeBlock:^(NSURLConnection *connection, NSURLAuthenticationChallenge *challenge)
 {
     [challenge.sender useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];
     [challenge.sender continueWithoutCredentialForAuthenticationChallenge:challenge];
 }];

[operation setShouldExecuteAsBackgroundTaskWithExpirationHandler:^{
    LogVerbose(@"Background time expired for AFNetworking...");
}];


[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

    NSString *xmlStr = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
    NSDictionary *xmlDic = [NSDictionary dictionaryWithXMLString:xmlStr];

    if (success)
        success(xmlDic);

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    if (failure) {

         failure(error);
    }
}];

return nil;

}

Answer 1

您尚未共享任何您正在实现的代码。

NSOperationsQueue 只接受NSOperation，您必须提供MaxConcurrentOperationCount 属性来告诉队列您要并行执行多少操作。

在您的情况下，您定义了方法：methodA()、methodB()、methodC()...methodZ()。每个方法都使用NSOperation 执行网络调用。但是你在NSOperationsQueue 中添加了什么，你没有提到。