/// <summary>
/// Process actions in parallel.
/// </summary>
/// <param name="state"></param>
protected override void Process(object state)
{
lock (m_actions)
{
// Init expected count. Lock is not needed since we don't expect app to add task while executing sequence but there is no harm.
m_expectedCount = m_actions.Count;
}
bool done = false;
while (!done)
{
AsyncTask task = null;
lock (m_actions)
{
if (m_actions.Count > 0)
{
task = m_actions.Dequeue();
}
}
if (task == null)
{
done = true; // No more actions to execute.
}
else
{
Exception exception = null;
task.TaskCompleted +=
delegate(object sender, AsyncTaskCompletedEventArgs e)
{
this.Logger.Log(Logger.LogLevel.Info, String.Format("**{0}({1})** <{2}> Started.", this.Name, this.Component.Name, task.Name));
this.AddCompletedAction(task); // Could have failed or succeeded. The method should take care of this.
};
try
{
this.Logger.Log(Logger.LogLevel.Info, String.Format("**{0}({1})** <{2}> Starting.", this.Name, this.Component.Name, task.Name));
task.StartTask();
}
catch (RealTimeException rte)
{
exception = rte;
}
catch (InvalidOperationException ivo)
{
exception = ivo;
}
finally
{
if (exception != null)
{
this.Logger.Log(Logger.LogLevel.Info, String.Format("**{0}({1})** Completed <{2}> with exception. {3}",
this.Name, this.Component.Name, task.Name, exception.ToString()));
this.AddCompletedAction(task); // This task resulted in exception.
}
}
}
}
if (m_expectedCount == 0)
{
// It was empty list of actions to start with.
this.CompleteSequence(null);
}
}
/// <summary>
/// Process Sequence serially.
/// </summary>
protected virtual void Process(object state)
{
AsyncTaskResult previousActionResult = state as AsyncTaskResult; // Can be null.
AsyncTask task = null;
lock (m_actions)
{
m_pendingAction = null;
if (m_actions.Count > 0)
{
task = m_actions.Dequeue();
m_pendingAction = task;
}
}
if (task == null)
{
// No more items in queue. Complete the starup operaton if needed.
this.CompleteSequence(null);
}
else
{
Exception exception = null;
try
{
task.TaskCompleted +=
delegate(object sender, AsyncTaskCompletedEventArgs e)
{
AsyncTask reportingAction = sender as AsyncTask;
if (!Object.ReferenceEquals(reportingAction, task))
{
this.Logger.Log(Logger.LogLevel.Warning,
String.Format("Reporting task does not match pending task. Task is probably completing twice. Task = {0}", reportingAction.Name));
return; // Ignore this reporting.
}
if (task.Exception != null && this.Component.Logger != null)
{
this.Component.Logger.Log(Logger.LogLevel.Verbose,
String.Format("<{0}> completed with exception.", task.Name), task.Exception);
}
else
{
this.Component.Logger.Log(Logger.LogLevel.Verbose,
String.Format("**{0}({1})** <{2}> Completed Task.",
this.Name, this.Component.Name, task.Name));
}
bool completionNeeded = false;
Exception ex = task.Exception;
if (task.Exception != null && !task.IsOptional)
{
completionNeeded = true;
}
if (completionNeeded)
{
this.CompleteSequence(ex);
}
else
{
// Make sure the task chained previous result, if any.
if (previousActionResult != null)
{
AsyncTaskResult currActionResult = e.ActionResult;
if (currActionResult == null) // This should not be null if Task always returned it. Play safe.
{
currActionResult = new AsyncTaskResult(task.Exception);
}
// If the task completing has task result, then we need to chain. If not create a new one.
currActionResult.PreviousActionResult = previousActionResult;
}
// Continue processing.
System.Threading.ThreadPool.QueueUserWorkItem(this.Process, e.ActionResult);
}
};
this.Component.Logger.Log(Logger.LogLevel.Verbose,
String.Format("**{0}({1})** <{2}> Started Task.",
this.Name, this.Component.Name, task.Name));
task.PreviousActionResult = previousActionResult;
task.StartTask();
}
catch (RealTimeException rte)
{
exception = rte;
}
catch (InvalidOperationException ivo)
{
exception = ivo;
}
finally
{
if (exception != null && !task.IsOptional)
{
this.Component.Logger.Log(Logger.LogLevel.Verbose,
String.Format("**{0}({1})** Completing due to exception while starting <{2}>.",
this.Name, this.Component.Name, task.Name), exception);
this.CompleteSequence(exception);
}
else if (exception != null)
{
this.Component.Logger.Log(Logger.LogLevel.Verbose, String.Format("**{0}({1})** resuming after exception while starting <{2}>.",
this.Name, this.Component.Name, task.Name), exception);
// Continue processing. Ignore failuer in task.
System.Threading.ThreadPool.QueueUserWorkItem(this.Process);
}
// else, wait for the task to complete.
}
}
}
public void CreateOrGetUserEndpoint(AsyncTask task, object state)
{
string ownerUri = state as string;
if (String.IsNullOrEmpty(ownerUri))
{
task.Complete(new InvalidOperationException("OwnerUri is needed to request a user endpoint."));
return;
}
RealTimeAddress ownerAddress = null;
try
{
ownerAddress = new RealTimeAddress(ownerUri);
}
catch (ArgumentException exception)
{
task.Complete(exception);
return;
}
MyUserEndpoint myUserEndpoint = null;
lock (this.SyncRoot)
{
if (m_userEndpoints.ContainsKey(ownerAddress))
{
myUserEndpoint = m_userEndpoints[ownerAddress];
if (myUserEndpoint.UserEndpoint.State == LocalEndpointState.Terminating || myUserEndpoint.UserEndpoint.State == LocalEndpointState.Terminated)
{
myUserEndpoint = null; // Loose it since it is going away.
m_userEndpoints.Remove(ownerAddress);
m_userEndpointReferenceCounts.Remove(ownerAddress);
}
else
{
int count = m_userEndpointReferenceCounts[ownerAddress];
count++;
m_userEndpointReferenceCounts[ownerAddress] = count;
}
}
if (myUserEndpoint == null)
{
// Create and add user endpoint into dictionary.
// One could use the platform discover server from uri if the topology has DNS srv records for server auto discovery.
// Normally, this would point to a director. Here, we will use the proxy of the application endpoint.
UserEndpointSettings userEndpointSettings = new UserEndpointSettings(ownerUri, m_settings.ProxyHost, m_settings.ProxyPort);
UserEndpoint userEndpoint = new UserEndpoint(m_parent.Platform, userEndpointSettings);
myUserEndpoint = new MyUserEndpoint(userEndpoint);
m_userEndpoints.Add(ownerAddress, myUserEndpoint);
m_userEndpointReferenceCounts.Add(ownerAddress, 1);
myUserEndpoint.UserEndpoint.StateChanged += UserEndpointStateChanged; // Ensures that only one registration per endpoint.
}
UserEndpointCreationActionResult result = new UserEndpointCreationActionResult(myUserEndpoint, null);
task.TaskResult = result; // Store it for now.
if (myUserEndpoint.UserEndpoint.State == LocalEndpointState.Established)
{
task.Complete(null, result);
}
else if (myUserEndpoint.UserEndpoint.State == LocalEndpointState.Establishing)
{
// Wait till the endpoint establish completes.
lock (this.SyncRoot)
{
m_pendingUserEndpointCreationTasks.Add(task);
}
}
else if (myUserEndpoint.UserEndpoint.State == LocalEndpointState.Idle)
{
AsyncTask establishTask = new AsyncTask(this.StartupUserEndpoint, myUserEndpoint.UserEndpoint);
establishTask.TaskCompleted +=
delegate(object sender, AsyncTaskCompletedEventArgs e)
{
task.TaskResult.Exception = e.ActionResult.Exception; // Transfer
task.Complete(e.ActionResult.Exception, task.TaskResult);
lock (this.SyncRoot)
{
// Complete pending tasks
foreach (AsyncTask pendingTask in m_pendingUserEndpointCreationTasks)
{
pendingTask.TaskResult.Exception = e.ActionResult.Exception;
pendingTask.Complete(e.ActionResult.Exception, pendingTask.TaskResult);
}
m_pendingUserEndpointCreationTasks.Clear();
}
};
establishTask.StartTask();
}
}
}
