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適用於 Reliable Services 的 WCF 式通訊堆疊

Reliable Services 架構允許服務作者選擇其想要針對服務使用的通訊堆疊。 他們可以透過從 CreateServiceReplicaListeners 或 CreateServiceInstanceListeners 方法傳回的 ICommunicationListener ,來外掛所選擇的通訊堆疊。 服務作者如果想要使用 Windows Communication Foundation (WCF) 式通訊,架構可提供以 WCF 式實作的通訊堆疊。

WCF 通訊接聽程式

ICommunicationListener 的 ECF 特定實作係由 Microsoft.ServiceFabric.Services.Communication.Wcf.Runtime.WcfCommunicationListener 類別提供。

假設我們有類型 ICalculator

[ServiceContract]
public interface ICalculator
{
    [OperationContract]
    Task<int> Add(int value1, int value2);
}

我們可以透過下列方式在服務中建立 WCF 通訊接聽程式。


protected override IEnumerable<ServiceReplicaListener> CreateServiceReplicaListeners()
{
    return new[] { new ServiceReplicaListener((context) =>
        new WcfCommunicationListener<ICalculator>(
            wcfServiceObject:this,
            serviceContext:context,
            //
            // The name of the endpoint configured in the ServiceManifest under the Endpoints section
            // that identifies the endpoint that the WCF ServiceHost should listen on.
            //
            endpointResourceName: "WcfServiceEndpoint",

            //
            // Populate the binding information that you want the service to use.
            //
            listenerBinding: WcfUtility.CreateTcpListenerBinding()
        )
    )};
}

撰寫適用於 WCF 通訊堆疊的用戶端

為了撰寫能夠使用 WCF 來與服務進行通訊的用戶端,架構提供了 WcfClientCommunicationFactory,也就是 ClientCommunicationFactoryBase的 WCF 特定實作。


public WcfCommunicationClientFactory(
    Binding clientBinding = null,
    IEnumerable<IExceptionHandler> exceptionHandlers = null,
    IServicePartitionResolver servicePartitionResolver = null,
    string traceId = null,
    object callback = null);

WCF 通訊通道可以從 WcfCommunicationClientFactory 建立的 WcfCommunicationClient 來存取。


public class WcfCommunicationClient : ServicePartitionClient<WcfCommunicationClient<ICalculator>>
   {
       public WcfCommunicationClient(ICommunicationClientFactory<WcfCommunicationClient<ICalculator>> communicationClientFactory, Uri serviceUri, ServicePartitionKey partitionKey = null, TargetReplicaSelector targetReplicaSelector = TargetReplicaSelector.Default, string listenerName = null, OperationRetrySettings retrySettings = null)
           : base(communicationClientFactory, serviceUri, partitionKey, targetReplicaSelector, listenerName, retrySettings)
       {
       }
   }

用戶端程式碼可以使用 WcfCommunicationClientFactory 連同實作 ServicePartitionClientWcfCommunicationClient 來決定服務端點,並與服務通訊。

// Create binding
Binding binding = WcfUtility.CreateTcpClientBinding();
// Create a partition resolver
IServicePartitionResolver partitionResolver = ServicePartitionResolver.GetDefault();
// create a  WcfCommunicationClientFactory object.
var wcfClientFactory = new WcfCommunicationClientFactory<ICalculator>
    (clientBinding: binding, servicePartitionResolver: partitionResolver);

//
// Create a client for communicating with the ICalculator service that has been created with the
// Singleton partition scheme.
//
var calculatorServiceCommunicationClient =  new WcfCommunicationClient(
                wcfClientFactory,
                ServiceUri,
                ServicePartitionKey.Singleton);

//
// Call the service to perform the operation.
//
var result = calculatorServiceCommunicationClient.InvokeWithRetryAsync(
                client => client.Channel.Add(2, 3)).Result;

注意

預設 ServicePartitionResolver 假設用戶端正在與服務相同的叢集中執行。 如果不是這樣,請建立 ServicePartitionResolver 物件,並傳入叢集連接端點。

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