// acquires the main domain
private bool Acquire()
{
// if signaled, too late to acquire, give up
// the handler is not installed so that would be the hosting environment
if (_signaled)
{
_logger.Info <MainDom>("Cannot acquire (signaled).");
return(false);
}
_logger.Info <MainDom>("Acquiring.");
// Get the lock
var acquired = false;
try
{
acquired = _mainDomLock.AcquireLockAsync(LockTimeoutMilliseconds).GetAwaiter().GetResult();
}
catch (Exception ex)
{
_logger.Error <MainDom>(ex, "Error while acquiring");
}
if (!acquired)
{
_logger.Info <MainDom>("Cannot acquire (timeout).");
// In previous versions we'd let a TimeoutException be thrown
// and the appdomain would not start. We have the opportunity to allow it to
// start without having MainDom? This would mean that it couldn't write
// to nucache/examine and would only be ok if this was a super short lived appdomain.
// maybe safer to just keep throwing in this case.
throw new TimeoutException("Cannot acquire MainDom");
// return false;
}
try
{
// Listen for the signal from another AppDomain coming online to release the lock
_listenTask = _mainDomLock.ListenAsync();
_listenCompleteTask = _listenTask.ContinueWith(t =>
{
_logger.Debug <MainDom>("Listening task completed with {TaskStatus}", _listenTask.Status);
OnSignal("signal");
}, TaskScheduler.Default); // Must explicitly specify this, see https://blog.stephencleary.com/2013/10/continuewith-is-dangerous-too.html
}
catch (OperationCanceledException ex)
{
// the waiting task could be canceled if this appdomain is naturally shutting down, we'll just swallow this exception
_logger.Warn <MainDom>(ex, ex.Message);
}
_logger.Info <MainDom>("Acquired.");
return(true);
}
// acquires the main domain
private bool Acquire()
{
// if signaled, too late to acquire, give up
// the handler is not installed so that would be the hosting environment
if (_signaled)
{
_logger.Info <MainDom>("Cannot acquire (signaled).");
return(false);
}
_logger.Info <MainDom>("Acquiring.");
// Get the lock
var acquired = _mainDomLock.AcquireLockAsync(LockTimeoutMilliseconds).GetAwaiter().GetResult();
if (!acquired)
{
_logger.Info <MainDom>("Cannot acquire (timeout).");
// In previous versions we'd let a TimeoutException be thrown
// and the appdomain would not start. We have the opportunity to allow it to
// start without having MainDom? This would mean that it couldn't write
// to nucache/examine and would only be ok if this was a super short lived appdomain.
// maybe safer to just keep throwing in this case.
throw new TimeoutException("Cannot acquire MainDom");
// return false;
}
try
{
// Listen for the signal from another AppDomain coming online to release the lock
_mainDomLock.ListenAsync().ContinueWith(_ => OnSignal("signal"));
}
catch (OperationCanceledException ex)
{
// the waiting task could be canceled if this appdomain is naturally shutting down, we'll just swallow this exception
_logger.Warn <MainDom>(ex, ex.Message);
}
_logger.Info <MainDom>("Acquired.");
return(true);
}
