// Start and Stop commands are composite commands that take multiple turns.
// Ee don't wnat them to interleave with other concurrent Start/Stop commands, as well as not with QueueDistributionChangeNotification.
// Therefore, we serialize them all via the same nonReentrancyGuarantor.
private Task QueueCommandForExecution(PersistentStreamProviderCommand command, int commandSeqNumber)
{
return(nonReentrancyGuarantor.AddNext(() =>
{
// skip execution of an older/previous command since already got a newer command.
if (commandSeqNumber < latestCommandNumber)
{
Log(ErrorCode.PersistentStreamPullingManager_15,
"Skipping execution of command number {0} since already received a later command (already have command number {1}).",
commandSeqNumber, latestCommandNumber);
return Task.CompletedTask;
}
switch (command)
{
case PersistentStreamProviderCommand.StartAgents:
return StartAgents();
case PersistentStreamProviderCommand.StopAgents:
return StopAgents();
default:
throw new OrleansException(String.Format("PullingAgentManager got unsupported command {0}", command));
}
}));
}
public async Task <object> ExecuteCommand(PersistentStreamProviderCommand command, object arg)
{
latestCommandNumber++;
int commandSeqNumber = latestCommandNumber;
try
{
Log(ErrorCode.PersistentStreamPullingManager_13,
String.Format("Got command {0}{1}: commandSeqNumber = {2}, managerState = {3}.",
command, arg != null ? " with arg " + arg : String.Empty, commandSeqNumber, managerState));
switch (command)
{
case PersistentStreamProviderCommand.StartAgents:
case PersistentStreamProviderCommand.StopAgents:
await QueueCommandForExecution(command, commandSeqNumber);
return(null);
case PersistentStreamProviderCommand.GetAgentsState:
return(managerState);
case PersistentStreamProviderCommand.GetNumberRunningAgents:
return(NumberRunningAgents);
default:
throw new OrleansException(String.Format("PullingAgentManager does not support command {0}.", command));
}
}
finally
{
Log(ErrorCode.PersistentStreamPullingManager_15,
String.Format("Done executing command {0}: commandSeqNumber = {1}, managerState = {2}, num running agents = {3}.",
command, commandSeqNumber, managerState, NumberRunningAgents));
}
}
// Start and Stop commands are composite commands that take multiple turns.
// Ee don't wnat them to interleave with other concurrent Start/Stop commands, as well as not with QueueDistributionChangeNotification.
// Therefore, we serialize them all via the same nonReentrancyGuarantor.
private Task QueueCommandForExecution(PersistentStreamProviderCommand command, int commandSeqNumber)
{
return nonReentrancyGuarantor.AddNext(() =>
{
// skip execution of an older/previous command since already got a newer command.
if (commandSeqNumber < latestCommandNumber)
{
Log(ErrorCode.PersistentStreamPullingManager_15,
"Skipping execution of command number {0} since already received a later command (already have command number {1}).",
commandSeqNumber, latestCommandNumber);
return TaskDone.Done;
}
switch (command)
{
case PersistentStreamProviderCommand.StartAgents:
return StartAgents();
case PersistentStreamProviderCommand.StopAgents:
return StopAgents();
default:
throw new OrleansException(String.Format("PullingAgentManager got unsupported command {0}", command));
}
});
}
public async Task<object> ExecuteCommand(PersistentStreamProviderCommand command, object arg)
{
latestCommandNumber++;
int commandSeqNumber = latestCommandNumber;
try
{
Log(ErrorCode.PersistentStreamPullingManager_13,
String.Format("Got command {0}{1}: commandSeqNumber = {2}, managerState = {3}.",
command, arg != null ? " with arg " + arg : String.Empty, commandSeqNumber, managerState));
switch (command)
{
case PersistentStreamProviderCommand.StartAgents:
case PersistentStreamProviderCommand.StopAgents:
await QueueCommandForExecution(command, commandSeqNumber);
return null;
case PersistentStreamProviderCommand.GetAgentsState:
return managerState;
case PersistentStreamProviderCommand.GetNumberRunningAgents:
return NumberRunningAgents;
default:
throw new OrleansException(String.Format("PullingAgentManager does not support command {0}.", command));
}
}
finally
{
Log(ErrorCode.PersistentStreamPullingManager_15,
String.Format("Done executing command {0}: commandSeqNumber = {1}, managerState = {2}, num running agents = {3}.",
command, commandSeqNumber, managerState, NumberRunningAgents));
}
}
