nEDM Interface

Slow-control data

_design/slow_control_time and _design/slow_control_time_label

These views are the main views for querying data (getting data from a database). It works on documents that looks like:

{
   "type" : "data",
   // ..
   "value" : {
     "data_1" : 1.23 // a number value
     // ..
   }
}

and emits for each data point (all keys in "value").

slow_control_time

This view emits as key: [data_name, Y, M, D, H, M, S].

• map

  function(doc) {
     if (!doc.type || doc.type != 'data') return;
     var then = new Date(Date.parse(doc.timestamp));
     for (var key in doc.value) {
         emit([key,
               then.getUTCFullYear(), then.getUTCMonth(),
               then.getUTCDate(), then.getUTCHours(),
               then.getUTCMinutes(), then.getUTCSeconds()], Number(doc.value[key]));
     }
  }

• reduce: _stats

slow_control_time_label

This view simply reverses the ordering of the output key, so: [Y, M, D, H, M, S, data_name].

• map

  function(doc) {
     if (!doc.type || doc.type != 'data') return;
     var then = new Date(Date.parse(doc.timestamp));
     for (var key in doc.value) {
         emit([
               then.getUTCFullYear(), then.getUTCMonth(),
               then.getUTCDate(), then.getUTCHours(),
               then.getUTCMinutes(), then.getUTCSeconds(), key], doc.value[key]);
     }
  }

• reduce _stats

Query examples

• In nEDM Interface:
  • nEDMDB
  • MonitoringGraph
• In pynedm: