Html PrintCachedServer(CachedServer server)
{
Html data = Html.Format ("<h3>{0}</h3>", server.endpoint);
foreach (CachedConnection c in server.Connections) {
if (c.Busy)
data += Html.Format (" <span style=\"background: green;\">busy</span> ") + c.served;
else
data += Html.Format (" <span style=\"background: gray;\">free</span> ") + c.served;
}
return data;
}
/// <summary>
/// Get cached or create a new connection to specific ip-addresses.
/// </summary>
/// <param name='dns'>
/// Dns.
/// </param>
/// <param name='port'>
/// Port.
/// </param>
/// <param name='forceNew'>
/// Don't reuse, always start a new connection
/// </param>
/// <param name='wait'>
/// Wait until there is a slot free, otherwise it will return null.
/// </param>
public CachedConnection Connect(DnsLookup dns, int port, bool forceNew, bool wait)
{
CachedConnection c = null;
while (true) {
//Search for cached connections, return if found.
//Also calculates the server with the least number of connections to
CachedServer leastUsedServer = null;
lock (serverCache) {
//Search for open connection and least used server
foreach (IPAddress ip in dns.AList) {
IPEndPoint ep = new IPEndPoint (ip, port);
CachedServer server;
if (serverCache.TryGetValue (ep, out server) == false) {
server = new CachedServer (ep, this);
serverCache.Add (ep, server);
}
//Test for least used server
if (leastUsedServer == null) {
leastUsedServer = server;
}
if (server.ConnectionCount < leastUsedServer.ConnectionCount)
leastUsedServer = server;
if (forceNew == false)
continue;
c = server.GetActiveConnection ();
if (c != null)
return c;
}
}
//No cached connection found, create one
if (forceNew)
c = leastUsedServer.GetNewConnection ();
else
c = leastUsedServer.GetUnlimitedNewConnection ();
if (c != null)
return c;
if (wait == false)
return null;
//Maximum number of connections to all servers were already reached.
//Wait for new connections
releasedConnection.WaitOne (TimeSpan.FromSeconds (5));
}
}
public CachedConnection(CachedServer server)
{
this.server = server;
}