/// <summary>
/// Generate a proxy file. Capture the item first.
/// </summary>
/// <param name="rootFiles"></param>
/// <param name="treeName"></param>
/// <param name="queryDirectory"></param>
/// <returns></returns>
public override Task <FileInfo> GenerateProxyFile(Uri[] rootFiles, string treeName, DirectoryInfo queryDirectory)
{
SetConnectionString(rootFiles);
TraceHelpers.TraceInfo(13, $"ExecuteQueuedQueriesForAScheme: --> Proxy: {rootFiles[0].Host}", opt: TraceEventType.Start);
return(base.GenerateProxyFile(rootFiles, treeName, queryDirectory));
}
public WiqlVisitor(TraceHelpers log, Expression exp)
{
this.expression = exp;
this.log = log;
}
/// <summary>
/// The detailed code that runs the query.
/// </summary>
/// <param name="tSelectorClassName">Name of the TSelector object</param>
/// <param name="outputFileInfo">Where the output results should be written for eventual reading</param>
private async Task <Dictionary <string, ROOTNET.Interface.NTObject> > RunNtupleQuery(string tSelectorClassName, IEnumerable <KeyValuePair <string, object> > variablesToLoad,
string treeName, FileInfo[] rootFiles)
{
///
/// Create a new TSelector to run
///
TraceHelpers.TraceInfo(18, "RunNtupleQuery: Startup - doing selector lookup");
var cls = ROOTNET.NTClass.GetClass(tSelectorClassName);
if (cls == null)
{
throw new InvalidOperationException("Unable find class '" + tSelectorClassName + "' in the ROOT TClass registry that was just successfully compiled - can't run ntuple query - major inconsistency");
}
var selector = cls.New() as ROOTNET.Interface.NTSelector;
///
/// Create the chain and load file files into it.
///
TraceHelpers.TraceInfo(19, "RunNtupleQuery: Creating the TChain");
using (var tree = new ROOTNET.NTChain(treeName))
{
foreach (var f in rootFiles)
{
tree.Add(f.FullName);
}
// If there are any objects we need to send to the selector, then send them on now
TraceHelpers.TraceInfo(20, "RunNtupleQuery: Saving the objects we are going to ship over");
var objInputList = new ROOTNET.NTList();
selector.InputList = objInputList;
using (await ROOTLock.LockAsync())
{
ROOTNET.NTH1.AddDirectory(false);
foreach (var item in variablesToLoad)
{
var obj = item.Value as ROOTNET.Interface.NTNamed;
if (obj == null)
{
throw new InvalidOperationException("Can only deal with named objects");
}
var cloned = obj.Clone(item.Key);
objInputList.Add(cloned);
}
}
// Setup the cache for more efficient reading. We assume we are on a machine with plenty of memory
// for this.
tree.CacheSize = 1024 * 1024 * 100; // 100 MB cache
if (LeafNames == null)
{
tree.AddBranchToCache("*", true);
}
else
{
foreach (var leaf in LeafNames)
{
tree.AddBranchToCache(leaf, true);
}
}
tree.StopCacheLearningPhase();
// Always Do the async prefetching (this is off by default for some reason, but...).
ROOTNET.Globals.gEnv.Value.SetValue("TFile.AsynchPrefetching", 1);
// Finally, run the whole thing
TraceHelpers.TraceInfo(21, "RunNtupleQuery: Running TSelector");
if (Environment.BreakToDebugger)
{
System.Diagnostics.Debugger.Break();
}
tree.Process(selector);
TraceHelpers.TraceInfo(22, "RunNtupleQuery: Done");
// If debug, dump some stats...
if (Environment.CompileDebug)
{
tree.PrintCacheStats();
}
//
// Get the results and put them into a map for safe keeping!
// Also, since we want the results to live beyond this guy, make sure that when
// the selector is deleted the objects don't go away!
//
var results = new Dictionary <string, ROOTNET.Interface.NTObject>();
foreach (var o in selector.OutputList)
{
results[o.Name] = o;
}
selector.OutputList.SetOwner(false);
return(results);
}
}