/// <inheritdoc />
public override void SaveRequest(UploadRequest request, bool isCreate)
{
// TODO: uncomment, add check to make sure object is the same
//if (isCreate)
//{
try
{
#if NET35
_requestsLock.EnterUpgradeableReadLock();
#else
_requestsLock.AcquireReaderLock(-1);
#endif
Dictionary <string, UploadRequest> requests;
if (!_uploadRequests.TryGetValue(request.UploadSessionId, out requests))
{
requests = new Dictionary <string, UploadRequest>();
requests[request.UploadRequestId] = request;
#if !NET35
// TODO: does this break something?
LockCookie cookie = new LockCookie();
#endif
try
{
#if NET35
_requestsLock.EnterWriteLock();
#else
cookie = _requestsLock.UpgradeToWriterLock(-1);
#endif
_uploadRequests[request.UploadSessionId] = requests;
}
finally
{
#if NET35
_requestsLock.ExitWriteLock();
#else
_requestsLock.DowngradeFromWriterLock(ref cookie);
#endif
}
}
else
{
lock (requests)
requests[request.UploadRequestId] = request;
}
}
finally
{
#if NET35
_requestsLock.ExitUpgradeableReadLock();
#else
_requestsLock.ReleaseReaderLock();
#endif
}
//}
}
public void ExitWriteLock(ref ReaderWriterLockCookie cookie, int millisecondsTimeout)
{
#if NET35_OR_GREATER || NETCOREAPP || NETSTANDARD
if (!ReaderWriterLock.IsWriteLockHeld)
{
return;
}
ReaderWriterLock.ExitWriteLock();
if (cookie.FromRead)
{
if (!ReaderWriterLock.TryEnterReadLock(millisecondsTimeout))
{
throw new TimeoutException("恢复读锁超时");
}
}
#else
if (!ReaderWriterLock.IsWriterLockHeld)
{
return;
}
if (cookie.FromRead)
{
ReaderWriterLock.DowngradeFromWriterLock(ref cookie.LockCookie);
return;
}
ReaderWriterLock.ReleaseWriterLock();
#endif
}
public void StillInReadLockAfterDowngrading()
{
// Setup
var l = new ReaderWriterLockSlim();
// Act/Verify
l.AcquireReaderLock(0);
Assert.IsTrue(l.IsReaderLockHeld);
l.UpgradeToWriterLock(0);
Assert.IsTrue(l.IsWriterLockHeld);
Assert.IsTrue(l.IsReaderLockHeld);
l.DowngradeFromWriterLock();
Assert.IsFalse(l.IsWriterLockHeld);
Assert.IsTrue(l.IsReaderLockHeld);
l.ReleaseReaderLock();
Assert.IsFalse(l.IsReaderLockHeld);
} // end of function - StillInReadLockAfterDowngrading
