/**
* make sure the function is re-entriable.
**/
static CheDaoInterface _HandlePackage(LocalChePackage p)
{
CheDaoInterface msg = create(p);
if (msg != null)
{
switch (msg.message_type)
{
case CheDaoInterface.data_validation:
lock (mPendingList)
{
CheRequest item = (CheRequest)msg;
try
{
//put to pending list
mPendingList.Add(item.Order_Number, item);
}
catch (Exception e)
{
Trace.WriteLineIf(Program.trace_sw.TraceError, "Insert CheRequest Failed, maybe the key already exist " + e.Message, "error");
msg.Result = 2; //2:其它不符;
}
}
break;
case CheDaoInterface.clean_cmd: //delete the item one hour later
int bypass_counter = 0;
lock (mPendingList)
{
Dictionary <String, CheRequest> newPendingList = new Dictionary <String, CheRequest>();
foreach (String str in mPendingList.Keys)
{
CheRequest c_item = mPendingList[str];
DateTime c_date = new DateTime(c_item.create_time);
if (c_date.AddMinutes(AppConfig.GetLifeTimeOfRec()) > DateTime.Now)
{
newPendingList.Add(str, c_item);
}
else
{
bypass_counter++;
}
}
mPendingList = newPendingList;
}
Trace.WriteLineIf(Program.trace_sw.TraceVerbose, "clean up the internal cache and bypass " + bypass_counter.ToString());
break;
case CheDaoInterface.scan_print:
case CheDaoInterface.manual_print:
lock (mPendingList)
{
ChePrintRequest p_item = (ChePrintRequest)msg;
if (mPendingList.ContainsKey(p_item.Order_Number))
{
CheRequest w_item = mPendingList[p_item.Order_Number];
mPendingList.Remove(p_item.Order_Number);
Program.NewRequest(w_item); // to be print
}
else
{
Trace.WriteLineIf(Program.trace_sw.TraceError, "invalide print request, no key exist", "error");
msg.Result = 2; //2:已开票;
}
}
break;
case CheDaoInterface.print_confirm:
Program.NewRequest(msg); //internal message
break;
case CheDaoInterface.delete_cmd:
Program.NewRequest(msg); //internal message
break;
default:
msg = null;
break;
}
try
{
lock (bk_stream)
{
if (msg != null)
{
p.save(bk_stream); // just save the valid msg
}
}
}
catch (Exception e)
{
save_error_count++;
Trace.WriteLineIf(Program.trace_sw.TraceError, "Write backup stream failed " + e.Message, "error");
}
}
return(msg);
}
public static void restore()
{
const int max_fragment = 1024;
byte[] buffer = new byte[max_fragment];
int read_len = 0;
if (rst_stream != null)
{
int msg_count = 0;
int discard_count = 0;
Trace.WriteLineIf(Program.trace_sw.TraceVerbose, "restore dumped package", "info");
Boolean read_ok = false;
do
{
read_ok = false;
read_len = rst_stream.Read(buffer, 0, sizeof(int));
if (read_len != sizeof(int))
{
continue;
}
int msg_len = BitConverter.ToInt32(buffer, 0);
read_len = rst_stream.Read(buffer, 0, sizeof(short));
if (read_len != sizeof(short))
{
continue;
}
short msg_type = BitConverter.ToInt16(buffer, 0);
read_len = rst_stream.Read(buffer, 0, sizeof(long));
if (read_len != sizeof(long))
{
continue;
}
DateTime c_t = new DateTime(BitConverter.ToInt64(buffer, 0));
read_len = rst_stream.Read(buffer, 0, msg_len);
if (read_len != msg_len)
{
continue;
}
read_ok = true;
msg_count++;
if (c_t.AddMinutes(AppConfig.GetLifeTimeOfRec()) < DateTime.Now)
{
discard_count++;
continue; // skip the message because it is too old.
}
LocalChePackage p = new LocalChePackage(msg_type, buffer, msg_len, c_t.Ticks);
_HandlePackage(p);
} while (read_ok);
Trace.WriteLineIf(Program.trace_sw.TraceInfo, String.Format("restore done found msg {0:d} discard {1:d}", msg_count, discard_count), "info");
String obsolete_fn = active_a == "A-" ? "B-" : "A-";
rst_stream.Close();
try
{
File.Delete(obsolete_fn + bk_fn);
}
catch (Exception e) {
Trace.WriteLineIf(Program.trace_sw.TraceError, "delete backup file " + obsolete_fn + bk_fn + " failed" + e.Message, "error");
}
}
return;
}
