public IPooledEngine CheckoutEngine()
{
PooledEngine pooledEngine = null;
lock (_poolMutex)
{
if (_enginesCheckedOut < _scriptEngineSettings.MaxEnginesInPool)
{
if (Engines.Count > 0)
{
pooledEngine = Engines.TakeFirst();
}
else
{
pooledEngine = CreateNewEngine();
}
}
}
if (pooledEngine == null)
{
Monitor.Wait(_checkoutMutex);
pooledEngine = CheckoutEngine() as PooledEngine;
}
else
{
pooledEngine.UseCount++;
_enginesCheckedOut++;
pooledEngine.CheckedIn = true;
}
return(pooledEngine);
}
public void CheckinEngine(IPooledEngine pooledEngine)
{
lock (_poolMutex)
{
PooledEngine unwrappedPooledEngine = (PooledEngine)pooledEngine;
if (unwrappedPooledEngine != null && !unwrappedPooledEngine.CheckedIn)
{
unwrappedPooledEngine.Expired |= unwrappedPooledEngine.UseCount == _scriptEngineSettings.PoolEngineExpirationUseCount;
if (unwrappedPooledEngine.Expired)
{
DestroyEngine(unwrappedPooledEngine);
}
else
{
Engines.AddLast(unwrappedPooledEngine);
}
_enginesCheckedOut--;
unwrappedPooledEngine.CheckedIn = true;
Monitor.Pulse(_checkoutMutex);
}
}
}
private PooledEngine CreateNewEngine()
{
PooledEngine pooledEngine = new PooledEngine()
{
ScriptEngine = new MsieJsEngineAdapter(new MsieJsEngine()),
PoolId = _enginesCheckedOut
};
pooledEngine.ExpirationTimer = new Timer((state) =>
{
lock (_poolMutex)
{
if (!pooledEngine.Expired && pooledEngine.CheckedIn)
{
Engines.Remove(pooledEngine);
DestroyEngine(pooledEngine);
}
pooledEngine.Expired = true;
pooledEngine.ExpirationTimer = null;
}
}, null, _scriptEngineSettings.PoolEngineExpirationInMinutes, Timeout.Infinite);
return(pooledEngine);
}
private void DestroyEngine(PooledEngine pooledEngine)
{
pooledEngine.ScriptEngine.Dispose();
pooledEngine.ExpirationTimer?.Dispose();
pooledEngine.ExpirationTimer = null;
}
