Workflow foundation 4 服务总线工作流活动
我想访问带有某些特定活动的工作流中的服务总线队列和主题 我找不到任何适合这种情况的(和)是最近的一个 我想设计一个自定义活动,它使用QueueClient异步接收代理消息,使用用async/await模式实现的BeginReceive方法(请参阅) 首先,我想问一下,是否有什么原因让我更喜欢建议的方法(适应的WCF)而不是我想要的方法(使用QueueClient) 然后,我将感谢您以一种持久性友好的方式帮助设计它 更新: 这就是我迄今为止所尝试的:Workflow foundation 4 服务总线工作流活动,workflow-foundation-4,async-await,c#-5.0,azure-servicebus-queues,Workflow Foundation 4,Async Await,C# 5.0,Azure Servicebus Queues,我想访问带有某些特定活动的工作流中的服务总线队列和主题 我找不到任何适合这种情况的(和)是最近的一个 我想设计一个自定义活动,它使用QueueClient异步接收代理消息,使用用async/await模式实现的BeginReceive方法(请参阅) 首先,我想问一下,是否有什么原因让我更喜欢建议的方法(适应的WCF)而不是我想要的方法(使用QueueClient) 然后,我将感谢您以一种持久性友好的方式帮助设计它 更新: 这就是我迄今为止所尝试的: public class AsyncRecei
public class AsyncReceiveBrokeredMessage : AsyncCodeActivity<BrokeredMessage>
{
[RequiredArgument]
public InArgument<string> ConnectionString { get; set; }
[RequiredArgument]
public InArgument<string> Path { get; set; }
protected sealed override IAsyncResult BeginExecute(AsyncCodeActivityContext context, AsyncCallback callback, object state)
{
var connectionString = this.ConnectionString.Get(context);
var path = this.Path.Get(context);
var queueClient = QueueClient.CreateFromConnectionString(connectionString, path);
var cts = new CancellationTokenSource();
context.UserState = new ReceiveState
{
CancellationTokenSource = cts,
QueueClient = queueClient
};
var task = ExecuteAsync(context, cts.Token);
var tcs = new TaskCompletionSource<BrokeredMessage>(state);
task.ContinueWith(
t =>
{
if (t.IsFaulted)
{
tcs.TrySetException(t.Exception.InnerExceptions);
}
else if (t.IsCanceled)
{
tcs.TrySetCanceled();
}
else
{
tcs.TrySetResult(t.Result);
}
if (callback != null)
{
callback(tcs.Task);
}
});
return tcs.Task;
}
protected sealed override BrokeredMessage EndExecute(AsyncCodeActivityContext context, IAsyncResult result)
{
var task = (Task<BrokeredMessage>)result;
try
{
return task.Result;
}
catch (OperationCanceledException)
{
if (context.IsCancellationRequested)
{
context.MarkCanceled();
}
else
{
throw;
}
return null; // or throw?
}
catch (AggregateException exception)
{
if (exception.InnerException is OperationCanceledException)
{
if (context.IsCancellationRequested)
{
context.MarkCanceled();
}
else
{
throw;
}
return null; // or throw?
}
ExceptionDispatchInfo.Capture(exception.InnerException).Throw();
throw;
}
}
protected override void Cancel(AsyncCodeActivityContext context)
{
var state = (ReceiveState)context.UserState;
state.CancellationTokenSource.Cancel();
}
private async Task<BrokeredMessage> ExecuteAsync(
AsyncCodeActivityContext context, CancellationToken cancellationToken)
{
var receiveState = context.UserState as ReceiveState;
var receiveTask = Task<BrokeredMessage>.Factory.FromAsync(
receiveState.QueueClient.BeginReceive, receiveState.QueueClient.EndReceive, null);
var completionTask = receiveTask.ContinueWith(
t =>
{
BrokeredMessage result;
if (t.IsCanceled)
{
context.MarkCanceled();
result = null;
}
else if (t.IsFaulted)
{
result = null;
}
else
{
t.Result.Complete();
result = t.Result;
}
receiveState.QueueClient.Close();
return result;
},
cancellationToken);
return await completionTask;
}
private class ReceiveState
{
public CancellationTokenSource CancellationTokenSource { get; set; }
public QueueClient QueueClient { get; set; }
}
}
公共类AsyncReceiveBrokeredMessage:AsyncCodeActivity
{
[必需参数]
公共InArgument连接字符串{get;set;}
[必需参数]
公共非独占路径{get;set;}
受保护的密封重写IAsyncResult BeginExecute(AsyncCodeActivityContext上下文、AsyncCallback回调、对象状态)
{
var connectionString=this.connectionString.Get(上下文);
var path=this.path.Get(上下文);
var queueClient=queueClient.CreateFromConnectionString(connectionString,路径);
var cts=新的CancellationTokenSource();
context.UserState=新接收状态
{
CancellationTokenSource=cts,
QueueClient=QueueClient
};
var task=ExecuteAsync(上下文,cts.Token);
var tcs=新任务完成源(状态);
task.ContinueWith(
t=>
{
如果(t.IsFaulted)
{
tcs.TrySetException(t.Exception.InnerException);
}
否则,如果(t.IsCanceled)
{
tcs.trysetconceled();
}
其他的
{
tcs.TrySetResult(t.Result);
}
if(回调!=null)
{
回调(tcs.Task);
}
});
返回tcs.Task;
}
受保护的密封覆盖代理消息EndExecute(AsyncCodeActivityContext上下文,IAsyncResult结果)
{
var任务=(任务)结果;
尝试
{
返回任务。结果;
}
捕获(操作取消异常)
{
if(context.IsCancellationRequested)
{
MarkCanceled();
}
其他的
{
投掷;
}
返回null;//还是抛出?
}
捕获(AggregateException异常)
{
如果(exception.InnerException为OperationCanceledException)
{
if(context.IsCancellationRequested)
{
MarkCanceled();
}
其他的
{
投掷;
}
返回null;//还是抛出?
}
ExceptionDispatchInfo.Capture(exception.InnerException.Throw();
投掷;
}
}
受保护的覆盖无效取消(AsyncCodeActivityContext上下文)
{
var state=(ReceiveState)context.UserState;
state.CancellationTokenSource.Cancel();
}
专用异步任务ExecuteAsync(
AsyncCodeActivityContext上下文,CancellationToken CancellationToken)
{
var receiveState=context.UserState作为receiveState;
var receiveTask=Task.Factory.fromsync(
receiveState.QueueClient.BeginReceive,receiveState.QueueClient.EndReceive,null);
var completionTask=receiveTask.ContinueWith(
t=>
{
代理消息结果;
如果(t.IsCanceled)
{
MarkCanceled();
结果=空;
}
否则,如果(t.IsFaulted)
{
结果=空;
}
其他的
{
t、 Result.Complete();
结果=t.结果;
}
receiveState.QueueClient.Close();
返回结果;
},
取消令牌);
返回等待完成任务;
}
私有类接收状态
{
public CancellationTokenSource CancellationTokenSource{get;set;}
公共队列客户端{get;set;}
}
}
并以这种方式进行了测试(使用本地Windows Server服务总线):
var connectionString=新变量
{
默认值=connectionStringValue
};
变量路径=新变量
{
默认值=路径值
};
var测试=新的While
{
身体=
新选择
{
分支机构=
{
新PickBranch
{
触发=
新AsyncReceiveBrokeredMessage
{
ConnectionString=新的InArgument(ConnectionString),
var connectionString = new Variable<string>
{
Default = connectionStringValue
};
var path = new Variable<string>
{
Default = pathValue
};
var test = new While
{
Body =
new Pick
{
Branches =
{
new PickBranch
{
Trigger =
new AsyncReceiveBrokeredMessage
{
ConnectionString = new InArgument<string>(connectionString),
Path = new InArgument<string>(path)
},
Action =
new WriteLine
{
Text =
"Received message"
}
},
new PickBranch
{
Trigger =
new Delay
{
Duration = TimeSpan.FromSeconds(10)
},
Action =
new WriteLine
{
Text =
"Timeout!"
}
}
}
},
Condition = true,
Variables = { connectionString, path }
};
WorkflowInvoker.Invoke(test);
NamespaceManager.CreateSubscription(
new SubscriptionDescription(TopicName, SubscriptionName)
{
LockDuration = TimeSpan.FromMinutes(5),
DefaultMessageTimeToLive = TimeSpan.FromDays(7),
EnableDeadLetteringOnMessageExpiration = true
});