public static ShutdownDelaySemaphore GetInstance()
{
if (_instance == null)
{
_instance = new ShutdownDelaySemaphore();
}
return(_instance);
}
protected override void OnLockAcquired()
{
if (ScmHostingConfigurations.FunctionsSyncTriggersDelayBackground)
{
shutdownDelayed = ShutdownDelaySemaphore.GetInstance().Acquire(_traceFactory.GetTracer());
}
else
{
OperationManager.SafeExecute(() => {
// Create Sentinel file for DWAS to check
// DWAS will check for presence of this file incase a an app setting based recycle needs to be performed in middle of deployment
// If this is present, DWAS will postpone the recycle so that deployment goes through first
if (!String.IsNullOrEmpty(siteRoot))
{
FileSystemHelpers.CreateDirectory(Path.Combine(siteRoot, @"ShutdownSentinel"));
string sentinelPath = Path.Combine(siteRoot, @"ShutdownSentinel\Sentinel.txt");
if (!FileSystemHelpers.FileExists(sentinelPath))
{
var file = FileSystemHelpers.CreateFile(sentinelPath);
file.Close();
}
// DWAS checks if write time of this file is in the future then only postpones the recycle
FileInfoBase sentinelFileInfo = FileSystemHelpers.FileInfoFromFileName(sentinelPath);
sentinelFileInfo.LastWriteTimeUtc = DateTime.UtcNow.AddMinutes(20);
}
});
}
IRepositoryFactory repositoryFactory = RepositoryFactory;
if (repositoryFactory != null)
{
IRepository repository = repositoryFactory.GetRepository();
if (repository != null)
{
// Clear any left over repository-related lock since we have the actual lock
repository.ClearLock();
}
}
}
protected override void OnLockRelease()
{
base.OnLockRelease();
if (ScmHostingConfigurations.FunctionsSyncTriggersDelayBackground && shutdownDelayed)
{
ShutdownDelaySemaphore.GetInstance().Release(_traceFactory.GetTracer());
}
else
{
OperationManager.SafeExecute(() => {
// Delete the Sentinel file to signal DWAS that deployment is complete
if (!String.IsNullOrEmpty(siteRoot))
{
string sentinelPath = Path.Combine(siteRoot, @"ShutdownSentinel\Sentinel.txt");
if (FileSystemHelpers.FileExists(sentinelPath))
{
FileSystemHelpers.DeleteFile(sentinelPath);
}
}
});
}
}