Information Service

Introduction

• Implemented in the is package.
• Again three aspects: information providers, information servers (many), information subscribers.
• But probably clients will both provide and subscribe to information.
• Multiple servers (identified by name) allow for scalability.
• Basic units of information are ISInfo objects (or subclasses).
• Simple subclasses are provided (ISInfoInt, ISInfoString, etc).
• Users can create subclasses containing complex structures.
• All ISInfo objects are stored and retrieved by name, where the first component is the server name, eg RunPars.NEvs, L1CaloStatus.JEM-0-15.

Example

  #include "is/isinfotmpl.h"
  
  IPCPartition partition ("Murrough");
  ISInfoDictionary dict (partition);
  ISInfoInt isVar;
  
  isVar = 3;
  dict.insert("L1CaloPars.simpleValue",isVar);
  isVar = 6;
  dict.update("L1CaloPars.simpleValue",isVar);
  dict.remove("L1CaloPars.simpleValue",isVar);