public async Task RebuildCatalogAsync()
{
var newCatalog = new Dictionary <string, ProbeInfo>();
var files = _probesDirectory.GetFiles("*.Probe.dll");
_logger.LogTrace($"Found {files.Length} potential probe assemblies.");
using var context = new SideLoadContext(_logger);
foreach (var file in files)
{
try
{
_logger.LogTrace($"Examining assembly: {file.Name}");
await using var stream = new FileStream(file.FullName, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, useAsync: true);
var assembly = context.LoadFromStream(stream);
var probeInfos = GetProbeInfos(file.FullName, assembly);
_logger.Log(
probeInfos.Length == 0 ? LogLevel.Warning : LogLevel.Information,
$"Discovered {probeInfos.Length} probe info(s) in assembly: {file.Name}.");
foreach (var probeInfo in probeInfos)
{
newCatalog.Add(probeInfo.Name, probeInfo);
}
Current = newCatalog;
}
catch (Exception ex)
{
_logger.LogWarning(ex, $"Unable to load assembly at path: {file.FullName}");
}
}
}
public IProbe Create(string probeName)
{
if (probeName == null)
{
throw new ArgumentNullException(nameof(probeName));
}
_logger.LogTrace($"Creating probe: {probeName}");
if (!_catalog.Current.TryGetValue(probeName, out var probeInfo))
{
throw new ArgumentOutOfRangeException(nameof(probeName), $"Probe named {probeName} not found.");
}
lock (_lock)
{
if (_probes.TryGetValue(probeName, out var context))
{
return(context.Probe);
}
_logger.LogTrace($"Probe not yet loaded, side loading: {probeInfo}");
var probeLogger = _loggerFactory.CreateLogger(probeInfo.TypeFullName);
var loader = new SideLoadContext(_loggerFactory.CreateLogger <SideLoadContext>());
var assembly = loader.LoadFromAssemblyPath(probeInfo.AssemblyLocation);
var probe = (IProbe)assembly.CreateInstance(probeInfo.TypeFullName, false, BindingFlags.Instance | BindingFlags.Public, null, new object[] { _configuration, probeLogger, _publisher }, CultureInfo.CurrentCulture, null);
context = new ProbeContext(loader, probe);
_probes.Add(probeInfo.Name, context);
return(context.Probe);
}
}
public ProbeContext(SideLoadContext context, IProbe probe)
{
Context = context ?? throw new ArgumentNullException(nameof(context));
Probe = probe ?? throw new ArgumentNullException(nameof(probe));
}
