public async Task AcquireReleaseLockAsync()
{
string sentinelPath = $"{Path.GetTempPath()}\\{Guid.NewGuid():N}";
IClock clock = new RealClock();
var holdLockTimeout = TimeSpan.FromMilliseconds(250);
var lockTimeout = TimeSpan.FromMilliseconds(2000);
// Lock the sentinel file.
var lockFileTask = Task.Run(async() =>
{
using (var stream = File.Open(
sentinelPath,
FileMode.CreateNew,
FileAccess.ReadWrite,
FileShare.Write))
{
await Task.Delay(holdLockTimeout);
stream.Close();
File.Delete(sentinelPath);
}
});
bool acquiredLock = false;
// Wait for a lock on the sentinel file.
var acquiredLockTask = FileHelper.AcquireFileLockAsync(
sentinelPath,
clock,
lockTimeout);
try
{
await lockFileTask;
acquiredLock = await acquiredLockTask;
}
finally
{
FileHelper.ReleaseFileLock(sentinelPath);
}
Assert.True(acquiredLock);
// Cleaned up?
Assert.True(!File.Exists(sentinelPath));
}