JANA/Geometry/JGeometryManager.cc

0001
0002 // Copyright 2007-2025, Jefferson Science Associates, LLC.
0003 // Subject to the terms in the LICENSE file found in the top-level directory.
0004 // Author: David Lawrence
0005
0006 #include "JGeometryManager.h"
0007
0008 #include <JANA/JLogger.h>
0009 #include <JANA/Geometry/JGeometryXML.h>
0010
0011
0012 JGeometry *JGeometryManager::GetJGeometry(unsigned int run_number) {
0013
0014     /// Return a pointer a JGeometry object that is valid for the given run number.
0015     ///
0016     /// This first searches through the list of existing JGeometry objects created by
0017     /// this JApplication object to see if it already has the right one. If so, a pointer
0018     /// to it is returned. If not, a new JGeometry object is created and added to the
0019     /// internal list. Note that since we need to make sure the list is not modified
0020     /// by one thread while being searched by another, a mutex is locked while searching
0021     /// the list. It is <b>NOT</b> efficient to get the JGeometry object pointer every
0022     /// event. Factories should get a copy in their brun() callback and keep a local
0023     /// copy of the pointer for use in the evnt() callback.
0024
0025     // Lock mutex to keep list from being modified while we search it
0026     std::lock_guard<std::mutex> lock(m_mutex);
0027
0028     for (auto geometry : geometries) {
0029         if (geometry->GetRunMin() > (int) run_number) continue;
0030         if (geometry->GetRunMax() < (int) run_number) continue;
0031         return geometry;
0032     }
0033
0034     // JGeometry object for this run_number doesn't exist in our list.
0035     // Create a new one and add it to the list.
0036     // We need to create an object of the appropriate subclass of
0037     // JGeometry. This is determined by the first several characters
0038     // of the URL that specifies the calibration database location.
0039     // For now, only the JGeometryXML subclass exists so we'll
0040     // just make one of those and defer the heavier algorithm until
0041     // later.
0042     const char *url = getenv("JANA_GEOMETRY_URL");
0043     if (!url) url = "file://./";
0044     const char *context = getenv("JANA_GEOMETRY_CONTEXT");
0045     if (!context) context = "default";
0046
0047     // Decide what type of JGeometry object to create and instantiate it
0048     string url_str = url;
0049     string context_str = context;
0050     JGeometry *g = nullptr;
0051
0052     if (url_str.find("xmlfile://") == 0 || url_str.find("ccdb://") == 0) {
0053         g = new JGeometryXML(string(url), run_number, context);
0054     }
0055     /*
0056     else if (url_str.find("mysql:") == 0) {
0057         g = new JGeometryMYSQL(string(url), run_number, context);
0058     }
0059     */
0060     if (g) {
0061         geometries.push_back(g);
0062     }
0063     else {
0064         jerr << "Cannot make JGeometry object for \"" << url_str << "\" (Don't know how!)" << std::endl;
0065     }
0066     return g;
0067 }