public AbsoluteDirectoryPath Acquire(AbsoluteDirectoryPath baseDirectory)
{
var buildLock = new Optional <BuildOutputDirLock>();
_fileSystem.MakeUnique(baseDirectory,
createName: no => baseDirectory.Rename(MakePathUnique.CreateNumberName(baseDirectory.Name, no)),
condition: p =>
{
buildLock = new BuildOutputDirLock(
p,
() =>
{
BuildOutputDirLock tmp;
var tries = 5;
while (!_lockedBuildDirectories.TryRemove(p, out tmp) && tries >= 0)
{
--tries;
}
});
var result = _lockedBuildDirectories.AddOrUpdate(
p,
buildLock.Value,
(buildOut, oldLock) => oldLock);
// If we did update an already lock - try to iterate over other possibilities.
return(result != buildLock);
});
buildLock.Do(bl => bl.Lock());
return(buildLock
.OrThrow(new Exception("Failed to generate a build output directory."))
.BuildDir);
}
/// <exception cref="FailedToCreateOutputDir"></exception>
public OutputDirWithLock CreateOrReuseOutputDir(AbsoluteDirectoryPath baseDir)
{
try
{
const int fileInUse = 0x20;
const int fileLocked = 0x21;
LockFile lockFile = null;
var path = _fileSystem.MakeUnique(baseDir,
createName: no => baseDir.Rename(MakePathUnique.CreateNumberName(baseDir.Name, no)),
condition: p =>
{
try
{
if (!_fileSystem.Exists(p))
{
_fileSystem.Create(p);
}
var lockFilePath = p / new FileName(".lock");
lockFile = new LockFile(lockFilePath);
return(false); // If the file wasn't locked, break creating of unique directories.
}
catch (IOException e)
{
var win32ErrorCode = e.HResult & 0xFFFF;
if (win32ErrorCode == fileLocked || win32ErrorCode == fileInUse)
{
return(true); // If the file was locked, continue creating unique directories.
}
throw;
}
});
return(new OutputDirWithLock(path, lockFile));
}
catch (Exception e)
{
throw new FailedToCreateOutputDir(baseDir, e);
}
}