Runcontrol

This page describes run control part of Coda DAQ system. It reside in $CODA/src/rc/ directory.

Communication between rcServer and runcontrol

Lets use 'tokenInterval' as example. It reside in database, and can be changed by runcontrol. Following steps were made to implement 'tokenInterval' functionality:

server side

• rcServer/Components.s/daqRun.h: object must have a type 'daqData' to use reloaded operations etc:

daqData* tokenInterval_; /* variable */
daqDataWriter* tokenIWriter_; /* database writer */

• rcServer/Components.s/daqRun.cc: create object, connect it to manager, and enable writing:

tokenInterval_ = new rcsDaqData (exptname_, "tokenInterval", 0); /* create variable */
tokenInterval_->connect (dataManager_);                          /* register to data manager (class daqDataUpdater) */
tokenInterval_->enableWrite ();                                  /* enable writing to database */
tokenIWriter_ = new rcsTokenIntervalWriter (this);               /* create database writer */
tokenInterval_->writer (tokenIWriter_);                          /* register database writer */
*tokenInterval_ = 0;                                             /* reset when needed */

• rcServer/Components.s/daqRun.cc: two methods dealing with database:

/* called from dbaseReader::parseOptions() when reading '_option' table during 'Configure' transition;
 in line '*tokenInterval_ = itval' operator '=' overloaded in daqData class, calling 'notifychannels' and 'write'
 methods; 'write' method calls rcsTokenIntervalWriter::write() registered above
*/
void
daqRun::tokenInterval (int itval, int writeUpdate)
{
  /* if not write to database, disable the write */
  if (!writeUpdate) tokenInterval_->disableWrite ();
  *tokenInterval_ = itval; /*overloaded '=' here ! */
  if (!writeUpdate) tokenInterval_->enableWrite ();  
}

/* writer for 'tokenInterval_', called from rcServer/Components.s/rcsTokenIntervalWriter.cc registered above */
void
daqRun::updateTokenInterval (int itval)
{
  dbreader_->putTokenInterval (itval); /* put new value into database */
}

• rcServer/Components.s/rcsTokenIntervalWriter.cc: writer to database:

void
rcsTokenIntervalWriter::write (daqData* data)
{
  run_->updateTokenInterval ((int)(*data));
}

• rcServer/Components.s/dbaseReader.cc: reading/writing value to database:

/* called from 'daqRun::updateTokenInterval(int itval)', record value to database */
void 
dbaseReader::putTokenInterval(int itval)
{
  .....
  ::sprintf (qstring, "update %s_option set value = '%d' where name = '%s'",run_.runtype (), itval, DBASE_TOKEN_INTERVAL);
  .....
}

/* read _option table, get tokenInterval value and calls daqRun::tokenInterval(int itval, int writeUpdate) disabling 'write'
to avoid writing back to the database we just read it from */
int 
dbaseReader::parseOptions (char* runtype)
{
  .....
  else if (::strcmp (row[0], DBASE_TOKEN_INTERVAL) == 0) /* DBASE_TOKEN_INTERVAL="tokenInterval" */
  {
    int titval;
    if (::sscanf (row[1], "%d", &titval) >= 1)
    {
      run_.tokenInterval (titval, 0);
      reporter->cmsglog (CMSGLOG_INFO1,"Token interval %d \n", titval);
    }
  }
  .....
}

client side

• rcClient/src.s/rcClient.h:

 daqData* tokenInterval_;

• rcClient/src.s/rcClient.cc: same as on server side, but use 'rccDaqData' instead of 'rcsDaqData':

 tokenInterval_     = new rccDaqData (exptname_, "tokenInterval",     0);
 tokenInterval_->connect (dataManager_);  
 tokenInterval_->enableWrite ();

• Xui/src.s/rcClientHandler.cc:

/* connect to database */
int
rcClientHandler::connect (char* database, char* exptname, char* msqld)
{
  .....
   if (handler_.monitorOnCallback (exptname, "tokenInterval",
	    (rcCallback)&(rcClientHandler::tokenIntervalCallback),
	    (void *)this) != CODA_SUCCESS)
      fprintf (stderr, "Cannot monitor on %s tolenInterval\n", exptname);
  .....
}

Xui/src.s/rcTokenIButton.cc: daqData data (client.exptname (), "tokenInterval", newval);