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  • ^\d\d\d\d \w\w\w \d\d \d\d:\d\d:\d\d WinEvtLog: Application: AUDIT_FAILURE(.): MSSQL.</em> [CLIENT: \S+] ^\d\d\d\d \w\w\w \d\d \d\d:\d\d:\d\d WinEvtLog: Application: (\w+)((\d+)): (.+...
  • <div><p>I just run command ...<p>btw, could you please just share how to choose best client timeout and service timeout? <p>thanks.</p><p>该提问来源于开源项目:Thriftpy/gunicorn_thrift</p></div>
  • <p>It is very important to validate transferred data on client. What were you thinking, ? Please ensure/restore CRC checking on client.</p><p>该提问来源于开源项目:lizardfs/lizardfs</p></div>
  • Furthermore, having several clients make it more explicit that there are differences between them, this is very important from a security point of view because although they may look similar they are...
  • The method used is a matter of preference, but it will be very difficult to use this library without first understanding the JSON syntax for the API, so it is recommended to look at the APIs Explorer ...
  • It is a very important issue to visually impaired people like me. The buttons are focusable but not poperly labelled, and if you use the mouse to review the dialog the screen reader reads nothing. ...
  • <p><strong>Additional information you deem important (e.g. issue happens only occasionally):</strong></p> <p>When setting the log level to TRACE8, the log reveals that this might have something to to ...
  • <div><p>In modern web applications, is important to validate form data on both the server-side (for security) and the client-side (for usability). Valitron does the server-side validation quite nicely...
  • s very important for a default value !!) <p>To optimize this bill, I want to set it onDemand because the max read/write I use is 1 or 2 (it depends), but I didn't see any configuration to set the ...
  • <p>Except for very small applications where you only have a single process/thread, chances are good that a webapp using this library runs on multiple servers or simply with multiple processes - so ...
  • <div><p>The code in core/base.js is very hard to understand. We need a cleanup and ... This is very important for further development.</p><p>该提问来源于开源项目:OpenSlides/OpenSlides</p></div>
  • <div><p>Although Poco is for network-centric, portable applications, it currently lack a very important features: proper proxy support for network client. <p>I am surprised when I find Poco does not ...
  • The current NetCore client fails at the very first hurdle on my most basic load test rig for, to me, obvious reasons (concurrency bugs), which manifest as a disconnection with a complete failure to ...
  • <p>Writing tests is very important. Please try to write some tests for your PR. If you need help, please do not hesitate to ask in this PR for help. <p><a href=...
  • This is incredibly useful feature and also very important to enable <em>authorization</em>. <p>I'm aware that <code>nghttpx</code> is expandable with <code>mruby</code> script, but I'm looking...
  • <div><p>This will be very important for wallet integrations in different programming languages. <p>Create another client crate, e.g. called “client-c-binding”, that will expose client functionality ...
  • To sync with traffic simulators like SUMO, it is a very important feature that traffic light control is supported. Is it possible for Carla to support spawn and control traffic lights from a client ...
  • <div><p>Normally all generic client messages are processed by the client executor. However there is no priority, and tasks in the executor can get processed very slowely. This can cause stability ...
  • It is sometimes very important to let the server knows when the client has made a proxy which may talks to the server. However due to the complication and the design that WCF server has employeed t.....

    It is sometimes very important to let the server knows when the client has made a proxy which may talks to the server.

    However due to the complication and the design that WCF server has employeed to separate the low-level connection based management from the actual proxy itself. It is really hard to tell when new client has been attempted on the server. 

     

    You may try something Get the Dispatcher associated with a ServiceHost and then try to get the Listener (IChannelListener which is attached to the Dispatcher)... Or even, you can create/Build the IChannelListener and then you can simulate the server in the Berkely style like socket api. You can check on the reference "How do I create a simple Web Server using WCF without the ServiceHost class?How do I create a simple Web Server using WCF without the ServiceHost class?" Doing this is OK if you are interactiing with system which interact with each other via soap/xml messages. However, you lost the power of encapsulate of the ServiceHost, which has the ability to dispatch the call to the right instance calll.

    However, the WCF system is quite flexible, you can even simuate your own connecion based management interace.

    So I will make the following interface.

        [ServiceContract]
        public interface IConnectionService
        {
            [OperationContract(IsOneWay = true)]
            void Connect();
    
            [OperationContract(IsOneWay = true)]
            void Disconnect();
        }

     and we shall make our service inerface inherited interface of this Connection Serivce. 

        [ServiceContract(CallbackContract = typeof(IPushCallback))]
        public interface IPushService : IHeartbeatService, IConnectionService
        {
            [OperationContract(IsOneWay = true)]
            void Subscribe(string tableId);
    
            [OperationContract(IsOneWay = true)]
            void UnSubscribe(string tableId);
    
            [OperationContract(IsOneWay = false)]
            bool IsSubscribed(string tableId);
    
            [OperationContract(IsOneWay = false)]
            string[] GetTableIds();
        }

     
    Then the client should do the following for an valid connection.

     

                InstanceContext instanceContext = new InstanceContext(new PushCallback());
                ServiceEndpoint  endpoint = new ServiceEndpoint(
                    ContractDescription.GetContract(typeof(IService)),
                    new NetTcpBinding(),
                    new EndpointAddress("net.tcp://127.0.0.1:9999/PushService"));
    
                //using (DuplexChannelFactory<IPushService> channelFactory = new DuplexChannelFactory<IPushService>(instanceContext, "PushService"))
                using (DuplexChannelFactory<IPushService> channelFactory = new DuplexChannelFactory<IPushService>(instanceContext, endpoint))
                {
                    IPushService proxy = channelFactory.CreateChannel();
    
                    using (proxy as IDisposable)
                    {
    
                        proxy.Connect();
                        string[] tableNames = proxy.GetTableIds();
    
                        Console.WriteLine("Available Table Ids: \n{0}", string.Join("\n", tableNames));
                        
                        proxy.Subscribe(tableNames[0]);
                        proxy.Subscribe(tableNames[1]);
                        proxy.Subscribe(tableNames[2]);
                        proxy.Subscribe(tableNames[3]);
                        proxy.Subscribe(tableNames[4]);
                        //proxy.Subscribe(tableNames[5]); // Union has problem
                        //proxy.Subscribe(tableNames[6]); // Source3 has problem
    
                        Console.WriteLine("the table {0} {1} registered", tableNames[0], proxy.IsSubscribed(tableNames[0]) ? "is" : "is not");
                        Console.WriteLine("the table {0} {1} registered", "NonExistingTableId", proxy.IsSubscribed("NonExistingTableId") ? "is" : "is not");
    
                        proxy.UnSubscribe(tableNames[0]);
                        Console.ReadLine();
                        proxy.Disconnect();
                        Console.WriteLine("Press any key to exit!");
                        Console.Read();
                    }
                }

     


    And in the implemetatin of the Service. 

    And as the implementor, you will need to maintain the inner state of the server, and you should check that the client is connected first. 

     

    e.g.

            public string[] GetTableIds()
            {
                TabularChannelManager.Instance.EnsureConnected(OperationContext.Current.GetCallbackChannel<ITabularPushCallback>());
                return TableIdDictWrapper.Instance.TableIdDict.Keys.ToArray<string>();
            }

     and the EnsureConnected call is something like this:

            internal void EnsureConnected(IPushCallback callbackChannel)
            {
                if (callbackChannel == null) throw new ArgumentNullException("callbackchannel");
                lock (SyncObj)
                {
                    if (!clients.Contains(callbackChannel))
                        throw new InvalidOperationException("Client is not connected");
                }
            }

     

     

     

    References

     

    :Notify Server if Client connecs.

    How do I create a simple Web Server using WCF without the ServiceHost class?

    展开全文
  • <div><p>This crash is not very common and due to that, almost impossible to reproduce. <p>This crash affects some mc networks, not just us. Things we all have in common: <p>BungeeCord 1.12.2 or ...
  • <p>Suggestions on what folders are to be considered important und should be shown even when the account is collapsed are welcome. <p>We can think about automatically hiding drafts if there are none, ...
  • <div><p>We need to make sure that the new registry client can ... This may be very important for debugging e.g. kafka applications.</p><p>该提问来源于开源项目:Apicurio/apicurio-registry</p></div>
  • This client side operation has annoyed me for a long time and I hope you will agree that this is an important and useful fix!  Implementation wise I have mirrored how the existing GetPlayerInfo ...
  • m very excited about Client Hints, and am glad to see you're pushing it towards implementation. I'm also wary of it for a couple of reasons. <p>My main concerns are that, at least in my ...
  • s very important to update operator's status (online/offline) at some reasonable interval. That may be done by developers themselves if there would be an API to get operator's status. May be ...
  • It happens every day on all replicas of the service and it is very important to us to fix the issue because this service is essential for our product. <p>For the first few times we just restarted the...
  • <div><p>Hey and very cool ecosystem of libraries, thanks for building and OSing them! <p>I’m coming from traditional REST APIs so Deepstream <code>records</code> and <code>lists</code> are new ...
  • <p>when trying to embed the very easy to use sync_client into my software I came to a point where I asked myself if it is safe to publish information from different threads using the sync client. ...
  • <p>Python developers are an important part of the Slack platform ecosystem. From internal apps for a specific organization or team to publicly distributed apps listed in our App Directory, tools and ...
  • Client side dependencies right now are very brittle and do not consider underlying parameters changing. <p>Solving this involves creating a real dependency system, which is a KEP unto it's own ...

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