private async Task RemoveQueues(List <QueueId> queuesToRemove)
{
if (queuesToRemove.Count == 0)
{
return;
}
// Stop the agents that for queues that are not in my range anymore.
var agents = new List <PersistentStreamPullingAgent>(queuesToRemove.Count);
Log(ErrorCode.PersistentStreamPullingManager_10, "About to remove {0} agents from my responsibility: {1}", queuesToRemove.Count, Utils.EnumerableToString(queuesToRemove, q => q.ToString()));
var removeTasks = new List <Task>();
foreach (var queueId in queuesToRemove)
{
PersistentStreamPullingAgent agent;
if (!queuesToAgentsMap.TryGetValue(queueId, out agent))
{
continue;
}
agents.Add(agent);
queuesToAgentsMap.Remove(queueId);
var agentGrainRef = agent.AsReference <IPersistentStreamPullingAgent>();
var task = OrleansTaskExtentions.SafeExecute(agentGrainRef.Shutdown);
task = task.LogException(logger, ErrorCode.PersistentStreamPullingManager_11,
String.Format("PersistentStreamPullingAgent {0} failed to Shutdown.", agent.QueueId));
removeTasks.Add(task);
}
try
{
await Task.WhenAll(removeTasks);
}
catch
{
// Just ignore this exception and proceed as if Initialize has succeeded.
// We already logged individual exceptions for individual calls to Shutdown. No need to log again.
}
foreach (var agent in agents)
{
try
{
providerRuntime.UnregisterSystemTarget(agent);
}
catch (Exception exc)
{
Log(ErrorCode.PersistentStreamPullingManager_12,
"Exception while UnRegisterSystemTarget of PersistentStreamPullingAgent {0}. Ignoring. Exc.Message = {1}.", ((ISystemTargetBase)agent).GrainId, exc.Message);
}
}
if (agents.Count > 0)
{
Log(ErrorCode.PersistentStreamPullingManager_10, "Removed {0} queues: {1}. Now own total of {2} queues: {3}",
agents.Count,
Utils.EnumerableToString(agents, agent => agent.QueueId.ToString()),
NumberRunningAgents,
PrintQueues(queuesToAgentsMap.Keys));
}
}