public IFileLock ReadLock(string lockFilePath)
{
try
{
using (var stream = fileSystem.OpenFileExclusively(lockFilePath, FileMode.Open, FileAccess.Read))
{
using (var streamReader = new StreamReader(stream))
{
var obj = JObject.Load(new JsonTextReader(streamReader));
var lockContent = new FileLock(obj["ProcessId"].ToObject <long>(),
obj["ProcessName"].ToString(),
obj["ThreadId"].ToObject <int>(),
obj["Timestamp"].ToObject <long>());
if (lockContent.BelongsToCurrentProcessAndThread())
{
return(lockContent);
}
return(new OtherProcessOwnsFileLock(lockContent));
}
}
}
catch (FileNotFoundException)
{
return(new MissingFileLock());
}
catch (IOException)
{
return(new OtherProcessHasExclusiveLockOnFileLock());
}
catch (JsonReaderException)
{
return(new UnableToDeserialiseLockFile(fileSystem.GetCreationTime(lockFilePath)));
}
catch (Exception) //We have no idea what went wrong - reacquire this lock
{
return(new OtherProcessHasExclusiveLockOnFileLock());
}
}
public OtherProcessOwnsFileLock(FileLock fileLock) : base(fileLock.ProcessId, fileLock.ProcessName, fileLock.ThreadId, fileLock.Timestamp)
{
}
protected bool Equals(FileLock other)
{
return(ProcessId == other.ProcessId &&
string.Equals(ProcessName, other.ProcessName) &&
ThreadId == other.ThreadId);
}