protected override string Execute(DurableTask.Core.TaskContext context, string input)
{
Console.WriteLine("Executing Cron Job. Started At: '" + DateTime.Now.ToString() + "' Number: " + input);
string completed = "Cron Job '" + input + "' Completed...";
Console.WriteLine(completed);
Count++;
return(completed);
}
protected override string Execute(DurableTask.Core.TaskContext context, string input)
{
ServiceEventSource.Current.Message($"Executing Cron Job. Started At: '{DateTime.Now}' Number: {input}");
Thread.Sleep(2 * 1000);
string completed = $"Cron Job '{input}' Completed...";
ServiceEventSource.Current.Message(completed);
return(completed);
}
protected override string Execute(DurableTask.Core.TaskContext context, string input)
{
Console.WriteLine($"Executing Cron Job. Started At: '{DateTime.Now}' Number: {input}");
Thread.Sleep(2 * 1000);
string completed = $"Cron Job '{input}' Completed...";
Console.WriteLine(completed);
return(completed);
}
protected override string Execute(DurableTask.Core.TaskContext context, string input)
{
GetUserName userNamedialog = new GetUserName();
Console.WriteLine("Waiting for user to enter name...");
string user = "";
DialogResult dialogResult = userNamedialog.ShowDialog();
if (dialogResult == DialogResult.OK)
{
user = userNamedialog.UserName;
}
Console.WriteLine("User Name Entered: " + user);
return(user);
}
protected override int Execute(DurableTask.Core.TaskContext context, int[] chunk)
{
if (chunk == null || chunk.Length != 2)
{
throw new ArgumentException("chunk");
}
Console.WriteLine("Compute Sum for " + chunk[0] + "," + chunk[1]);
var sum = 0;
int start = chunk[0];
int end = chunk[1];
for (int i = start; i <= end; i++)
{
sum += i;
}
Console.WriteLine("Total Sum for Chunk '" + chunk[0] + "," + chunk[1] + "' is " + sum.ToString());
return(sum);
}
protected override string Execute(DurableTask.Core.TaskContext context, string user)
{
string message;
if (!string.IsNullOrWhiteSpace(user) && user.Equals("TimedOut"))
{
message = "GetUser Timed out!!!";
Console.WriteLine(message);
}
else
{
Console.WriteLine("Sending greetings to user: "******"...");
Thread.Sleep(5 * 1000);
message = "Greeting sent to " + user;
Console.WriteLine(message);
}
return(message);
}
/// <summary>
/// Syncronous execute method, blocked for AsyncTaskActivity
/// </summary>
/// <returns>string.Empty</returns>
public override string Run(TaskContext context, string input)
{
// will never run
return(string.Empty);
}
/// <summary> /// Abstract method for executing a task activity synchronously /// </summary> /// <param name="context">The task context</param> /// <param name="input">The serialized input</param> /// <returns>Serialized output from the execution</returns> public abstract string Run(TaskContext context, string input);
/// <summary> /// Abstract method for executing a task activity asynchronously /// </summary> /// <param name="context">The task context</param> /// <param name="input">The typed input</param> /// <returns>The typed output from the execution</returns> protected abstract Task <TResult> ExecuteAsync(TaskContext context, TInput input);
/// <summary>
/// Virtual method for executing a task activity asynchronously
/// </summary>
/// <param name="context">The task context</param>
/// <param name="input">The serialized input</param>
/// <returns>Serialized output from the execution</returns>
public virtual Task <string> RunAsync(TaskContext context, string input)
{
return(Task.FromResult(Run(context, input)));
}
protected override string Execute(DurableTask.Core.TaskContext context, string input)
{
Console.WriteLine("CleanupTask Executed...");
return("CleanupResult");
}
protected override int Execute(DurableTask.Core.TaskContext context, int chunk)
{
Console.WriteLine($"Square::{chunk}::{chunk * chunk}");
return(chunk * chunk);
}
/// <summary>
/// Method for executing a task activity asyncronously
/// </summary>
/// <param name="context">The task context</param>
/// <param name="input">The serialized input</param>
/// <returns>Serialized output from the execution</returns>
public override async Task <string> RunAsync(TaskContext context, string input)
{
JArray jArray = JArray.Parse(input);
int parameterCount = jArray.Count;
ParameterInfo[] methodParameters = MethodInfo.GetParameters();
if (methodParameters.Length < parameterCount)
{
throw new TaskFailureException(
"TaskActivity implementation cannot be invoked due to more than expected input parameters. Signature mismatch.")
.WithFailureSource(this.MethodInfoString());
}
var inputParameters = new object[methodParameters.Length];
for (int i = 0; i < methodParameters.Length; i++)
{
Type parameterType = methodParameters[i].ParameterType;
if (i < parameterCount)
{
JToken jToken = jArray[i];
var jValue = jToken as JValue;
if (jValue != null)
{
inputParameters[i] = jValue.ToObject(parameterType);
}
else
{
string serializedValue = jToken.ToString();
inputParameters[i] = DataConverter.Deserialize(serializedValue, parameterType);
}
}
else
{
if (methodParameters[i].HasDefaultValue)
{
inputParameters[i] = Type.Missing;
}
else
{
inputParameters[i] = parameterType.IsValueType ? Activator.CreateInstance(parameterType) : null;
}
}
}
string serializedReturn;
try
{
object invocationResult = InvokeActivity(inputParameters);
if (invocationResult is Task)
{
var invocationTask = invocationResult as Task;
if (MethodInfo.ReturnType.IsGenericType)
{
serializedReturn = DataConverter.Serialize(await((dynamic)invocationTask));
}
else
{
await invocationTask;
serializedReturn = string.Empty;
}
}
else
{
serializedReturn = DataConverter.Serialize(invocationResult);
}
}
catch (TargetInvocationException e)
{
Exception realException = e.InnerException ?? e;
string details = Utils.SerializeCause(realException, DataConverter);
throw new TaskFailureException(realException.Message, details)
.WithFailureSource(this.MethodInfoString());
}
catch (Exception e) when(!Utils.IsFatal(e))
{
string details = Utils.SerializeCause(e, DataConverter);
throw new TaskFailureException(e.Message, e, details)
.WithFailureSource(this.MethodInfoString());
}
return(serializedReturn);
}
protected override string Execute(DurableTask.Core.TaskContext context, string input)
{
Console.WriteLine("BadTask Executed...");
throw new InvalidOperationException("BadTask failed.");
}
async Task OnProcessWorkItemAsync(TaskActivityWorkItem workItem)
{
Task renewTask = null;
var renewCancellationTokenSource = new CancellationTokenSource();
TaskMessage taskMessage = workItem.TaskMessage;
OrchestrationInstance orchestrationInstance = taskMessage.OrchestrationInstance;
TaskScheduledEvent scheduledEvent = null;
try
{
if (string.IsNullOrWhiteSpace(orchestrationInstance?.InstanceId))
{
this.logHelper.TaskActivityDispatcherError(
workItem,
$"The activity worker received a message that does not have any OrchestrationInstance information.");
throw TraceHelper.TraceException(
TraceEventType.Error,
"TaskActivityDispatcher-MissingOrchestrationInstance",
new InvalidOperationException("Message does not contain any OrchestrationInstance information"));
}
if (taskMessage.Event.EventType != EventType.TaskScheduled)
{
this.logHelper.TaskActivityDispatcherError(
workItem,
$"The activity worker received an event of type '{taskMessage.Event.EventType}' but only '{EventType.TaskScheduled}' is supported.");
throw TraceHelper.TraceException(
TraceEventType.Critical,
"TaskActivityDispatcher-UnsupportedEventType",
new NotSupportedException("Activity worker does not support event of type: " +
taskMessage.Event.EventType));
}
// call and get return message
scheduledEvent = (TaskScheduledEvent)taskMessage.Event;
this.logHelper.TaskActivityStarting(orchestrationInstance, scheduledEvent);
TaskActivity taskActivity = this.objectManager.GetObject(scheduledEvent.Name, scheduledEvent.Version);
if (taskActivity == null)
{
throw new TypeMissingException($"TaskActivity {scheduledEvent.Name} version {scheduledEvent.Version} was not found");
}
if (workItem.LockedUntilUtc < DateTime.MaxValue)
{
// start a task to run RenewUntil
renewTask = Task.Factory.StartNew(
() => this.RenewUntil(workItem, renewCancellationTokenSource.Token),
renewCancellationTokenSource.Token);
}
// TODO : pass workflow instance data
var context = new TaskContext(taskMessage.OrchestrationInstance);
HistoryEvent eventToRespond = null;
var dispatchContext = new DispatchMiddlewareContext();
dispatchContext.SetProperty(taskMessage.OrchestrationInstance);
dispatchContext.SetProperty(taskActivity);
dispatchContext.SetProperty(scheduledEvent);
await this.dispatchPipeline.RunAsync(dispatchContext, async _ =>
{
// correlation
CorrelationTraceClient.Propagate(() => workItem.TraceContextBase?.SetActivityToCurrent());
try
{
string output = await taskActivity.RunAsync(context, scheduledEvent.Input);
eventToRespond = new TaskCompletedEvent(-1, scheduledEvent.EventId, output);
}
catch (TaskFailureException e)
{
TraceHelper.TraceExceptionInstance(TraceEventType.Error, "TaskActivityDispatcher-ProcessTaskFailure", taskMessage.OrchestrationInstance, e);
string details = this.IncludeDetails ? e.Details : null;
eventToRespond = new TaskFailedEvent(-1, scheduledEvent.EventId, e.Message, details);
this.logHelper.TaskActivityFailure(orchestrationInstance, scheduledEvent.Name, (TaskFailedEvent)eventToRespond, e);
CorrelationTraceClient.Propagate(() => CorrelationTraceClient.TrackException(e));
}
catch (Exception e) when(!Utils.IsFatal(e) && !Utils.IsExecutionAborting(e))
{
TraceHelper.TraceExceptionInstance(TraceEventType.Error, "TaskActivityDispatcher-ProcessException", taskMessage.OrchestrationInstance, e);
string details = this.IncludeDetails
? $"Unhandled exception while executing task: {e}\n\t{e.StackTrace}"
: null;
eventToRespond = new TaskFailedEvent(-1, scheduledEvent.EventId, e.Message, details);
this.logHelper.TaskActivityFailure(orchestrationInstance, scheduledEvent.Name, (TaskFailedEvent)eventToRespond, e);
}
if (eventToRespond is TaskCompletedEvent completedEvent)
{
this.logHelper.TaskActivityCompleted(orchestrationInstance, scheduledEvent.Name, completedEvent);
}
});
var responseTaskMessage = new TaskMessage
{
Event = eventToRespond,
OrchestrationInstance = orchestrationInstance
};
await this.orchestrationService.CompleteTaskActivityWorkItemAsync(workItem, responseTaskMessage);
}
catch (SessionAbortedException e)
{
// The activity aborted its execution
this.logHelper.TaskActivityAborted(orchestrationInstance, scheduledEvent, e.Message);
TraceHelper.TraceInstance(TraceEventType.Warning, "TaskActivityDispatcher-ExecutionAborted", orchestrationInstance, "{0}: {1}", scheduledEvent.Name, e.Message);
await this.orchestrationService.AbandonTaskActivityWorkItemAsync(workItem);
}
finally
{
if (renewTask != null)
{
renewCancellationTokenSource.Cancel();
try
{
// wait the renewTask finish
await renewTask;
}
catch (OperationCanceledException)
{
// ignore
}
}
}
}
async Task OnProcessWorkItemAsync(TaskActivityWorkItem workItem)
{
Task renewTask = null;
var renewCancellationTokenSource = new CancellationTokenSource();
try
{
TaskMessage taskMessage = workItem.TaskMessage;
OrchestrationInstance orchestrationInstance = taskMessage.OrchestrationInstance;
if (string.IsNullOrWhiteSpace(orchestrationInstance?.InstanceId))
{
throw TraceHelper.TraceException(
TraceEventType.Error,
"TaskActivityDispatcher-MissingOrchestrationInstance",
new InvalidOperationException("Message does not contain any OrchestrationInstance information"));
}
if (taskMessage.Event.EventType != EventType.TaskScheduled)
{
throw TraceHelper.TraceException(
TraceEventType.Critical,
"TaskActivityDispatcher-UnsupportedEventType",
new NotSupportedException("Activity worker does not support event of type: " +
taskMessage.Event.EventType));
}
// call and get return message
var scheduledEvent = (TaskScheduledEvent)taskMessage.Event;
TaskActivity taskActivity = objectManager.GetObject(scheduledEvent.Name, scheduledEvent.Version);
if (taskActivity == null)
{
throw new TypeMissingException($"TaskActivity {scheduledEvent.Name} version {scheduledEvent.Version} was not found");
}
renewTask = Task.Factory.StartNew(() => RenewUntil(workItem, renewCancellationTokenSource.Token), renewCancellationTokenSource.Token);
// TODO : pass workflow instance data
var context = new TaskContext(taskMessage.OrchestrationInstance);
HistoryEvent eventToRespond = null;
var dispatchContext = new DispatchMiddlewareContext();
dispatchContext.SetProperty(taskMessage.OrchestrationInstance);
dispatchContext.SetProperty(taskActivity);
dispatchContext.SetProperty(scheduledEvent);
await this.dispatchPipeline.RunAsync(dispatchContext, async _ =>
{
try
{
string output = await taskActivity.RunAsync(context, scheduledEvent.Input);
eventToRespond = new TaskCompletedEvent(-1, scheduledEvent.EventId, output);
}
catch (TaskFailureException e)
{
TraceHelper.TraceExceptionInstance(TraceEventType.Error, "TaskActivityDispatcher-ProcessTaskFailure", taskMessage.OrchestrationInstance, e);
string details = IncludeDetails ? e.Details : null;
eventToRespond = new TaskFailedEvent(-1, scheduledEvent.EventId, e.Message, details);
}
catch (Exception e) when(!Utils.IsFatal(e))
{
TraceHelper.TraceExceptionInstance(TraceEventType.Error, "TaskActivityDispatcher-ProcessException", taskMessage.OrchestrationInstance, e);
string details = IncludeDetails
? $"Unhandled exception while executing task: {e}\n\t{e.StackTrace}"
: null;
eventToRespond = new TaskFailedEvent(-1, scheduledEvent.EventId, e.Message, details);
}
});
var responseTaskMessage = new TaskMessage
{
Event = eventToRespond,
OrchestrationInstance = orchestrationInstance
};
await this.orchestrationService.CompleteTaskActivityWorkItemAsync(workItem, responseTaskMessage);
}
finally
{
if (renewTask != null)
{
renewCancellationTokenSource.Cancel();
renewTask.Wait();
}
}
}
async Task OnProcessWorkItemAsync(TaskActivityWorkItem workItem)
{
Task?renewTask = null;
using var renewCancellationTokenSource = new CancellationTokenSource();
TaskMessage taskMessage = workItem.TaskMessage;
OrchestrationInstance orchestrationInstance = taskMessage.OrchestrationInstance;
TaskScheduledEvent? scheduledEvent = null;
Activity?diagnosticActivity = null;
try
{
if (string.IsNullOrWhiteSpace(orchestrationInstance?.InstanceId))
{
this.logHelper.TaskActivityDispatcherError(
workItem,
$"The activity worker received a message that does not have any OrchestrationInstance information.");
throw TraceHelper.TraceException(
TraceEventType.Error,
"TaskActivityDispatcher-MissingOrchestrationInstance",
new InvalidOperationException("Message does not contain any OrchestrationInstance information"));
}
if (taskMessage.Event.EventType != EventType.TaskScheduled)
{
this.logHelper.TaskActivityDispatcherError(
workItem,
$"The activity worker received an event of type '{taskMessage.Event.EventType}' but only '{EventType.TaskScheduled}' is supported.");
throw TraceHelper.TraceException(
TraceEventType.Critical,
"TaskActivityDispatcher-UnsupportedEventType",
new NotSupportedException("Activity worker does not support event of type: " +
taskMessage.Event.EventType));
}
scheduledEvent = (TaskScheduledEvent)taskMessage.Event;
if (scheduledEvent.Name == null)
{
string message = $"The activity worker received a {nameof(EventType.TaskScheduled)} event that does not specify an activity name.";
this.logHelper.TaskActivityDispatcherError(workItem, message);
throw TraceHelper.TraceException(
TraceEventType.Error,
"TaskActivityDispatcher-MissingActivityName",
new InvalidOperationException(message));
}
this.logHelper.TaskActivityStarting(orchestrationInstance, scheduledEvent);
TaskActivity?taskActivity = this.objectManager.GetObject(scheduledEvent.Name, scheduledEvent.Version);
if (workItem.LockedUntilUtc < DateTime.MaxValue)
{
// start a task to run RenewUntil
renewTask = Task.Factory.StartNew(
() => this.RenewUntil(workItem, renewCancellationTokenSource.Token),
renewCancellationTokenSource.Token);
}
var dispatchContext = new DispatchMiddlewareContext();
dispatchContext.SetProperty(taskMessage.OrchestrationInstance);
dispatchContext.SetProperty(taskActivity);
dispatchContext.SetProperty(scheduledEvent);
// correlation
CorrelationTraceClient.Propagate(() =>
{
workItem.TraceContextBase?.SetActivityToCurrent();
diagnosticActivity = workItem.TraceContextBase?.CurrentActivity;
});
ActivityExecutionResult?result;
try
{
await this.dispatchPipeline.RunAsync(dispatchContext, async _ =>
{
if (taskActivity == null)
{
// This likely indicates a deployment error of some kind. Because these unhandled exceptions are
// automatically retried, resolving this may require redeploying the app code so that the activity exists again.
// CONSIDER: Should this be changed into a permanent error that fails the orchestration? Perhaps
// the app owner doesn't care to preserve existing instances when doing code deployments?
throw new TypeMissingException($"TaskActivity {scheduledEvent.Name} version {scheduledEvent.Version} was not found");
}
var context = new TaskContext(taskMessage.OrchestrationInstance);
context.ErrorPropagationMode = this.errorPropagationMode;
HistoryEvent?responseEvent;
try
{
string?output = await taskActivity.RunAsync(context, scheduledEvent.Input);
responseEvent = new TaskCompletedEvent(-1, scheduledEvent.EventId, output);
}
catch (Exception e) when(e is not TaskFailureException && !Utils.IsFatal(e) && !Utils.IsExecutionAborting(e))
{
// These are unexpected exceptions that occur in the task activity abstraction. Normal exceptions from
// activities are expected to be translated into TaskFailureException and handled outside the middleware
// context (see further below).
TraceHelper.TraceExceptionInstance(TraceEventType.Error, "TaskActivityDispatcher-ProcessException", taskMessage.OrchestrationInstance, e);
string?details = this.IncludeDetails
? $"Unhandled exception while executing task: {e}"
: null;
responseEvent = new TaskFailedEvent(-1, scheduledEvent.EventId, e.Message, details, new FailureDetails(e));
this.logHelper.TaskActivityFailure(orchestrationInstance, scheduledEvent.Name, (TaskFailedEvent)responseEvent, e);
}
var result = new ActivityExecutionResult {
ResponseEvent = responseEvent
};
dispatchContext.SetProperty(result);
});
result = dispatchContext.GetProperty <ActivityExecutionResult>();
}
catch (TaskFailureException e)
{
// These are normal task activity failures. They can come from Activity implementations or from middleware.
TraceHelper.TraceExceptionInstance(TraceEventType.Error, "TaskActivityDispatcher-ProcessTaskFailure", taskMessage.OrchestrationInstance, e);
string?details = this.IncludeDetails ? e.Details : null;
var failureEvent = new TaskFailedEvent(-1, scheduledEvent.EventId, e.Message, details, e.FailureDetails);
this.logHelper.TaskActivityFailure(orchestrationInstance, scheduledEvent.Name, failureEvent, e);
CorrelationTraceClient.Propagate(() => CorrelationTraceClient.TrackException(e));
result = new ActivityExecutionResult {
ResponseEvent = failureEvent
};
}
catch (Exception middlewareException) when(!Utils.IsFatal(middlewareException))
{
// These are considered retriable
this.logHelper.TaskActivityDispatcherError(workItem, $"Unhandled exception in activity middleware pipeline: {middlewareException}");
throw;
}
HistoryEvent?eventToRespond = result?.ResponseEvent;
if (eventToRespond is TaskCompletedEvent completedEvent)
{
this.logHelper.TaskActivityCompleted(orchestrationInstance, scheduledEvent.Name, completedEvent);
}
else if (eventToRespond is null)
{
// Default response if middleware prevents a response from being generated
eventToRespond = new TaskCompletedEvent(-1, scheduledEvent.EventId, null);
}
var responseTaskMessage = new TaskMessage
{
Event = eventToRespond,
OrchestrationInstance = orchestrationInstance
};
await this.orchestrationService.CompleteTaskActivityWorkItemAsync(workItem, responseTaskMessage);
}
catch (SessionAbortedException e)
{
// The activity aborted its execution
this.logHelper.TaskActivityAborted(orchestrationInstance, scheduledEvent, e.Message);
TraceHelper.TraceInstance(TraceEventType.Warning, "TaskActivityDispatcher-ExecutionAborted", orchestrationInstance, "{0}: {1}", scheduledEvent?.Name, e.Message);
await this.orchestrationService.AbandonTaskActivityWorkItemAsync(workItem);
}
finally
{
diagnosticActivity?.Stop(); // Ensure the activity is stopped here to prevent it from leaking out.
if (renewTask != null)
{
renewCancellationTokenSource.Cancel();
try
{
// wait the renewTask finish
await renewTask;
}
catch (OperationCanceledException)
{
// ignore
}
}
}
}
protected override string Execute(DurableTask.Core.TaskContext context, string input)
{
ServiceEventSource.Current.Message("CleanupTask Executed...");
return("CleanupResult");
}
protected override string Execute(DurableTask.Core.TaskContext context, string input)
{
ServiceEventSource.Current.Message("BadTask Executed...");
throw new InvalidOperationException("BadTask failed.");
}
