internal ExecutionPlan(IList <CommandBinder> binders)
{
Contract.Assert(binders.Any(), "Execution plan needs a list of binders, one per command line.");
_binders = binders;
Headers = binders.Select(l => l.Header.Value).ToArray();
IsTransaction = Headers.Contains("MULTI", StringComparer.Ordinal);
HasScripts = Headers.Contains("EVALSHA", StringComparer.Ordinal);
ContextOperation = ExecutionContextOperation.Parse(Headers);
}
internal static ExecutionContextOperation Parse(String[] headers)
{
var op = new ExecutionContextOperation();
foreach (var header in headers)
{
switch (header)
{
case "WATCH":
op.OpensWatch = true;
break;
case "UNWATCH":
op.ClosesWatch = true;
op.OpensWatch = false;
break;
case "MULTI":
op.OpensTransaction = true;
break;
case "EXEC":
case "DISCARD":
op.ClosesTransaction = true;
op.ClosesWatch = true;
op.OpensTransaction = false;
op.OpensWatch = false;
break;
case "BLPOP":
case "BRPOP":
case "BRPOPLPUSH":
if (!op.OpensTransaction) // blocking commands inside transactions
{
op.HasBlockingCommand = true; // behaves as non blocking
}
break;
}
}
return(op);
}
internal void Apply(ExecutionContextOperation next)
{
IsTransactionOngoing = (IsTransactionOngoing && !next.ClosesTransaction) || next.OpensTransaction;
IsWatchOnGoing = (IsWatchOnGoing && !next.ClosesWatch) || next.OpensWatch;
}