internal void WriteMessage(ref int db, RedisMessage next, IList <QueuedMessage> queued)
{
if (next.Db >= 0)
{
if (db != next.Db)
{
db = next.Db;
RedisMessage changeDb = RedisMessage.Create(db, RedisLiteral.SELECT, db).ExpectOk().Critical();
if (queued != null)
{
queued.Add((QueuedMessage)(changeDb = new QueuedMessage(changeDb)));
}
RecordSent(changeDb);
changeDb.Write(outBuffer);
Interlocked.Increment(ref messagesSent);
}
LogUsage(db);
}
if (next.Command == RedisLiteral.SELECT)
{
// dealt with above; no need to send SELECT, SELECT
}
else
{
var mm = next as IMultiMessage;
RedisMessage tmp = next;
if (queued != null)
{
if (mm != null)
{
throw new InvalidOperationException(
"Cannot perform composite operations (such as transactions) inside transactions");
}
queued.Add((QueuedMessage)(tmp = new QueuedMessage(tmp)));
}
if (mm == null)
{
RecordSent(tmp);
tmp.Write(outBuffer);
Interlocked.Increment(ref messagesSent);
switch (tmp.Command)
{
// scripts can change database
case RedisLiteral.EVAL:
case RedisLiteral.EVALSHA:
// transactions can be aborted without running the inner commands (SELECT) that have been written
case RedisLiteral.DISCARD:
case RedisLiteral.EXEC:
// we can't trust the current database; whack it
db = -1;
break;
}
}
else
{
mm.Execute(this, ref db);
}
}
}