/// <summary>
/// Returns the hash string for all found plugins/folders
/// </summary>
/// <returns></returns>
internal static string GetPluginsHash(IEnumerable <FileInfo> plugins, bool generateNew = false)
{
if (generateNew || _pluginsHash.IsNullOrWhiteSpace())
{
using (DisposableTimer.TraceDuration <PluginManager>("Determining hash of plugins on disk", "Hash determined"))
{
var hashCombiner = new HashCodeCombiner();
//add each unique folder to the hash
foreach (var i in plugins.Select(x => x.Directory).DistinctBy(x => x.FullName))
{
hashCombiner.AddFolder(i);
}
_pluginsHash = hashCombiner.GetCombinedHashCode();
}
}
return(_pluginsHash);
}
public void HashCombiner_Test_Folder()
{
var dir = PrepareFolder();
var file1Path = Path.Combine(dir.FullName, "hastest1.txt");
File.Delete(file1Path);
using (var file1 = File.CreateText(Path.Combine(dir.FullName, "hastest1.txt")))
{
file1.WriteLine("hello");
}
//first test the whole folder
var combiner1 = new HashCodeCombiner();
combiner1.AddFolder(dir);
var combiner2 = new HashCodeCombiner();
combiner2.AddFolder(dir);
Assert.AreEqual(combiner1.GetCombinedHashCode(), combiner2.GetCombinedHashCode());
//now add a file to the folder
var file2Path = Path.Combine(dir.FullName, "hastest2.txt");
File.Delete(file2Path);
using (var file2 = File.CreateText(Path.Combine(dir.FullName, "hastest2.txt")))
{
//even though files are the same, the dates are different
file2.WriteLine("hello");
}
var combiner3 = new HashCodeCombiner();
combiner3.AddFolder(dir);
Assert.AreNotEqual(combiner1.GetCombinedHashCode(), combiner3.GetCombinedHashCode());
}