/// <summary>Takes one selector from end of LRU list of free selectors.</summary>
/// <remarks>
/// Takes one selector from end of LRU list of free selectors.
/// If there are no selectors awailable, it creates a new selector.
/// Also invokes trimIdleSelectors().
/// </remarks>
/// <param name="channel"/>
/// <returns></returns>
/// <exception cref="System.IO.IOException"/>
private SocketIOWithTimeout.SelectorPool.SelectorInfo Get(SelectableChannel channel
)
{
lock (this)
{
SocketIOWithTimeout.SelectorPool.SelectorInfo selInfo = null;
SelectorProvider provider = channel.Provider();
// pick the list : rarely there is more than one provider in use.
SocketIOWithTimeout.SelectorPool.ProviderInfo pList = providerList;
while (pList != null && pList.provider != provider)
{
pList = pList.next;
}
if (pList == null)
{
//LOG.info("Creating new ProviderInfo : " + provider.toString());
pList = new SocketIOWithTimeout.SelectorPool.ProviderInfo();
pList.provider = provider;
pList.queue = new List <SocketIOWithTimeout.SelectorPool.SelectorInfo>();
pList.next = providerList;
providerList = pList;
}
List <SocketIOWithTimeout.SelectorPool.SelectorInfo> queue = pList.queue;
if (queue.IsEmpty())
{
Selector selector = provider.OpenSelector();
selInfo = new SocketIOWithTimeout.SelectorPool.SelectorInfo();
selInfo.selector = selector;
selInfo.queue = queue;
}
else
{
selInfo = queue.RemoveLast();
}
TrimIdleSelectors(Time.Now());
return(selInfo);
}
}
/// <summary>Closes selectors that are idle for IDLE_TIMEOUT (10 sec).</summary>
/// <remarks>
/// Closes selectors that are idle for IDLE_TIMEOUT (10 sec). It does not
/// traverse the whole list, just over the one that have crossed
/// the timeout.
/// </remarks>
private void TrimIdleSelectors(long now)
{
long cutoff = now - IdleTimeout;
for (SocketIOWithTimeout.SelectorPool.ProviderInfo pList = providerList; pList !=
null; pList = pList.next)
{
if (pList.queue.IsEmpty())
{
continue;
}
for (IEnumerator <SocketIOWithTimeout.SelectorPool.SelectorInfo> it = pList.queue.
GetEnumerator(); it.HasNext();)
{
SocketIOWithTimeout.SelectorPool.SelectorInfo info = it.Next();
if (info.lastActivityTime > cutoff)
{
break;
}
it.Remove();
info.Close();
}
}
}