방법: 비동기 서비스 작업 구현

아티클
04/06/2023

WCF(Windows Communication Foundation) 애플리케이션에서는 클라이언트에게 호출 방법을 지시하지 않고 서비스 작업을 비동기 또는 동기적으로 구현할 수 있습니다. 예를 들어 비동기 서비스 작업을 동기적으로 호출하고, 동기 서비스 작업을 비동기적으로 호출할 수 있습니다. 클라이언트 애플리케이션에서 작업을 비동기적으로 호출하는 방법을 보여 주는 예제는 방법: 비동기적으로 서비스 작업 호출을 참조하세요. 동기 및 비동기 작업에 대한 자세한 내용은 서비스 계약 디자인 및 동기 및 비동기 작업을 참조하세요. 이 항목에서는 비동기 서비스 작업의 기본 구조에 대해 설명하지만 코드가 완성되지 않았습니다. 서비스 및 클라이언트 쪽의 전체 예제는 비동기를 참조하세요.

비동기 서비스 작업 구현

서비스 계약에서 .NET 비동기 디자인 지침에 따라 비동기 메서드 쌍을 선언합니다. Begin 메서드는 매개 변수, 콜백 개체 및 상태 개체를 가져와서 System.IAsyncResult 및 End를 가져오는 일치하는 System.IAsyncResult 메서드를 반환한 다음 반환 값을 반환합니다. 비동기 호출에 대한 자세한 내용은 비동기 프로그래밍 디자인 패턴을 참조하세요.

Begin 특성을 가진 비동기 메서드 쌍의 System.ServiceModel.OperationContractAttribute 메서드를 표시하고 OperationContractAttribute.AsyncPattern 속성을 true로 설정합니다. 예를 들어 다음 코드에서는 단계 1 및 2를 수행합니다.

  [OperationContractAttribute(AsyncPattern=true)]
  IAsyncResult BeginServiceAsyncMethod(string msg, AsyncCallback callback, object asyncState);

  // Note: There is no OperationContractAttribute for the end method.
  string EndServiceAsyncMethod(IAsyncResult result);
}

    <OperationContractAttribute(AsyncPattern:=True)> _
    Function BeginServiceAsyncMethod(ByVal msg As String, ByVal callback As AsyncCallback, ByVal asyncState As Object) As IAsyncResult

    ' Note: There is no OperationContractAttribute for the end method.
    Function EndServiceAsyncMethod(ByVal result As IAsyncResult) As String
End Interface

비동기 디자인 지침에 따라 서비스 클래스에서 Begin/End 메서드 쌍을 구현합니다. 예를 들어 다음 코드 예제에서는 비동기 서비스 작업의 Begin 및 End 부분 모두의 콘솔에 기록된 문자열의 구현 및 End 작업의 반환 값이 클라이언트에 반환되는 것을 보여 줍니다. 전체 코드 예제를 보려면 예제 단원을 참조하십시오.

public IAsyncResult BeginServiceAsyncMethod(string msg, AsyncCallback callback, object asyncState)
{
  Console.WriteLine("BeginServiceAsyncMethod called with: \"{0}\"", msg);
  return new CompletedAsyncResult<string>(msg);
}

public string EndServiceAsyncMethod(IAsyncResult r)
{
  CompletedAsyncResult<string> result = r as CompletedAsyncResult<string>;
  Console.WriteLine("EndServiceAsyncMethod called with: \"{0}\"", result.Data);
  return result.Data;
}

Public Function BeginServiceAsyncMethod(ByVal msg As String, ByVal callback As AsyncCallback, ByVal asyncState As Object) As IAsyncResult Implements ISampleService.BeginServiceAsyncMethod
    Console.WriteLine("BeginServiceAsyncMethod called with: ""{0}""", msg)
    Return New CompletedAsyncResult(Of String)(msg)
End Function

Public Function EndServiceAsyncMethod(ByVal r As IAsyncResult) As String Implements ISampleService.EndServiceAsyncMethod
    Dim result As CompletedAsyncResult(Of String) = TryCast(r, CompletedAsyncResult(Of String))
    Console.WriteLine("EndServiceAsyncMethod called with: ""{0}""", result.Data)
    Return result.Data
End Function

예시

다음 코드 예제에서는 다음을 보여 줍니다.

다음을 포함한 서비스 계약 인터페이스:
1. 동기 SampleMethod 작업.
2. 비동기 BeginSampleMethod 작업.
3. 비동기 BeginServiceAsyncMethod/EndServiceAsyncMethod 작업 쌍.
System.IAsyncResult 개체를 사용하여 서비스 구현.

using System;
using System.Collections.Generic;
using System.ServiceModel;
using System.Text;
using System.Threading;

namespace Microsoft.WCF.Documentation
{
  [ServiceContractAttribute(Namespace="http://microsoft.wcf.documentation")]
  public interface ISampleService{

    [OperationContractAttribute]
    string SampleMethod(string msg);

    [OperationContractAttribute(AsyncPattern = true)]
    IAsyncResult BeginSampleMethod(string msg, AsyncCallback callback, object asyncState);

    //Note: There is no OperationContractAttribute for the end method.
    string EndSampleMethod(IAsyncResult result);

    [OperationContractAttribute(AsyncPattern=true)]
    IAsyncResult BeginServiceAsyncMethod(string msg, AsyncCallback callback, object asyncState);

    // Note: There is no OperationContractAttribute for the end method.
    string EndServiceAsyncMethod(IAsyncResult result);
  }

  public class SampleService : ISampleService
  {
    #region ISampleService Members

    public string  SampleMethod(string msg)
    {
      Console.WriteLine("Called synchronous sample method with \"{0}\"", msg);
        return "The synchronous service greets you: " + msg;
    }

    // This asynchronously implemented operation is never called because
    // there is a synchronous version of the same method.
    public IAsyncResult BeginSampleMethod(string msg, AsyncCallback callback, object asyncState)
    {
      Console.WriteLine("BeginSampleMethod called with: " + msg);
      return new CompletedAsyncResult<string>(msg);
    }

    public string EndSampleMethod(IAsyncResult r)
    {
      CompletedAsyncResult<string> result = r as CompletedAsyncResult<string>;
      Console.WriteLine("EndSampleMethod called with: " + result.Data);
      return result.Data;
    }

    public IAsyncResult BeginServiceAsyncMethod(string msg, AsyncCallback callback, object asyncState)
    {
      Console.WriteLine("BeginServiceAsyncMethod called with: \"{0}\"", msg);
      return new CompletedAsyncResult<string>(msg);
    }

    public string EndServiceAsyncMethod(IAsyncResult r)
    {
      CompletedAsyncResult<string> result = r as CompletedAsyncResult<string>;
      Console.WriteLine("EndServiceAsyncMethod called with: \"{0}\"", result.Data);
      return result.Data;
    }
    #endregion
  }

  // Simple async result implementation.
  class CompletedAsyncResult<T> : IAsyncResult
  {
    T data;

    public CompletedAsyncResult(T data)
    { this.data = data; }

    public T Data
    { get { return data; } }

    #region IAsyncResult Members
    public object AsyncState
    { get { return (object)data; } }

    public WaitHandle AsyncWaitHandle
    { get { throw new Exception("The method or operation is not implemented."); } }

    public bool CompletedSynchronously
    { get { return true; } }

    public bool IsCompleted
    { get { return true; } }
    #endregion
  }
}


Imports System.Collections.Generic
Imports System.ServiceModel
Imports System.Text
Imports System.Threading

Namespace Microsoft.WCF.Documentation
    <ServiceContractAttribute(Namespace:="http://microsoft.wcf.documentation")> _
    Public Interface ISampleService

        <OperationContractAttribute> _
        Function SampleMethod(ByVal msg As String) As String

        <OperationContractAttribute(AsyncPattern:=True)> _
        Function BeginSampleMethod(ByVal msg As String, ByVal callback As AsyncCallback, ByVal asyncState As Object) As IAsyncResult

        'Note: There is no OperationContractAttribute for the end method.
        Function EndSampleMethod(ByVal result As IAsyncResult) As String

        <OperationContractAttribute(AsyncPattern:=True)> _
        Function BeginServiceAsyncMethod(ByVal msg As String, ByVal callback As AsyncCallback, ByVal asyncState As Object) As IAsyncResult

        ' Note: There is no OperationContractAttribute for the end method.
        Function EndServiceAsyncMethod(ByVal result As IAsyncResult) As String
    End Interface

    Public Class SampleService
        Implements ISampleService
#Region "ISampleService Members"

        Public Function SampleMethod(ByVal msg As String) As String Implements ISampleService.SampleMethod
            Console.WriteLine("Called synchronous sample method with ""{0}""", msg)
            Return "The synchronous service greets you: " & msg
        End Function

        ' This asynchronously implemented operation is never called because
        ' there is a synchronous version of the same method.
        Public Function BeginSampleMethod(ByVal msg As String, ByVal callback As AsyncCallback, ByVal asyncState As Object) As IAsyncResult Implements ISampleService.BeginSampleMethod
            Console.WriteLine("BeginSampleMethod called with: " & msg)
            Return New CompletedAsyncResult(Of String)(msg)
        End Function

        Public Function EndSampleMethod(ByVal r As IAsyncResult) As String Implements ISampleService.EndSampleMethod
            Dim result As CompletedAsyncResult(Of String) = TryCast(r, CompletedAsyncResult(Of String))
            Console.WriteLine("EndSampleMethod called with: " & result.Data)
            Return result.Data
        End Function

        Public Function BeginServiceAsyncMethod(ByVal msg As String, ByVal callback As AsyncCallback, ByVal asyncState As Object) As IAsyncResult Implements ISampleService.BeginServiceAsyncMethod
            Console.WriteLine("BeginServiceAsyncMethod called with: ""{0}""", msg)
            Return New CompletedAsyncResult(Of String)(msg)
        End Function

        Public Function EndServiceAsyncMethod(ByVal r As IAsyncResult) As String Implements ISampleService.EndServiceAsyncMethod
            Dim result As CompletedAsyncResult(Of String) = TryCast(r, CompletedAsyncResult(Of String))
            Console.WriteLine("EndServiceAsyncMethod called with: ""{0}""", result.Data)
            Return result.Data
        End Function
#End Region
    End Class

    ' Simple async result implementation.
    Friend Class CompletedAsyncResult(Of T)
        Implements IAsyncResult
        Private data_Renamed As T

        Public Sub New(ByVal data As T)
            Me.data_Renamed = data
        End Sub

        Public ReadOnly Property Data() As T
            Get
                Return data_Renamed
            End Get
        End Property

#Region "IAsyncResult Members"
        Public ReadOnly Property AsyncState() As Object Implements IAsyncResult.AsyncState
            Get
                Return CObj(data_Renamed)
            End Get
        End Property

        Public ReadOnly Property AsyncWaitHandle() As WaitHandle Implements IAsyncResult.AsyncWaitHandle
            Get
                Throw New Exception("The method or operation is not implemented.")
            End Get
        End Property

        Public ReadOnly Property CompletedSynchronously() As Boolean Implements IAsyncResult.CompletedSynchronously
            Get
                Return True
            End Get
        End Property

        Public ReadOnly Property IsCompleted() As Boolean Implements IAsyncResult.IsCompleted
            Get
                Return True
            End Get
        End Property
#End Region
    End Class
End Namespace

다음을 통해 공유

방법: 비동기 서비스 작업 구현

비동기 서비스 작업 구현

예시

참고 항목

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