// 10 seconds.
/// <summary>
/// Waits on the channel with the given timeout using one of the
/// cached selectors.
/// </summary>
/// <remarks>
/// Waits on the channel with the given timeout using one of the
/// cached selectors. It also removes any cached selectors that are
/// idle for a few seconds.
/// </remarks>
/// <param name="channel"/>
/// <param name="ops"/>
/// <param name="timeout"/>
/// <returns/>
/// <exception cref="System.IO.IOException"/>
internal virtual int Select(SelectableChannel channel, int ops, long timeout)
{
SocketIOWithTimeout.SelectorPool.SelectorInfo info = Get(channel);
SelectionKey key = null;
int ret = 0;
try
{
while (true)
{
long start = (timeout == 0) ? 0 : Time.Now();
key = channel.Register(info.selector, ops);
ret = info.selector.Select(timeout);
if (ret != 0)
{
return(ret);
}
if (Thread.CurrentThread().IsInterrupted())
{
throw new ThreadInterruptedException("Interrupted while waiting for " + "IO on channel "
+ channel + ". " + timeout + " millis timeout left.");
}
/* Sometimes select() returns 0 much before timeout for
* unknown reasons. So select again if required.
*/
if (timeout > 0)
{
timeout -= Time.Now() - start;
if (timeout <= 0)
{
return(0);
}
}
}
}
finally
{
if (key != null)
{
key.Cancel();
}
//clear the canceled key.
try
{
info.selector.SelectNow();
}
catch (IOException e)
{
Log.Info("Unexpected Exception while clearing selector : ", e);
// don't put the selector back.
info.Close();
return(ret);
}
Release(info);
}
}
// -- Closing --
/// <summary>
/// Closes this channel.
///
/// <para> This method, which is specified in the {@link
/// AbstractInterruptibleChannel} class and is invoked by the {@link
/// java.nio.channels.Channel#close close} method, in turn invokes the
/// <seealso cref="#implCloseSelectableChannel implCloseSelectableChannel"/> method in
/// order to perform the actual work of closing this channel. It then
/// cancels all of this channel's keys. </para>
/// </summary>
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: protected final void implCloseChannel() throws java.io.IOException
protected internal sealed override void ImplCloseChannel()
{
ImplCloseSelectableChannel();
lock (KeyLock)
{
int count = (Keys == null) ? 0 : Keys.Length;
for (int i = 0; i < count; i++)
{
SelectionKey k = Keys[i];
if (k != null)
{
k.Cancel();
}
}
}
}
