private static MiniServer GetAnyBackEndServer(int versionNumber, bool needsExactVersionMatch)
{
MiniServer miniServer = null;
try
{
miniServer = ServersCache.GetDeterministicBackEndServerForASite(versionNumber, null, needsExactVersionMatch, null);
}
catch (ServerHasNotBeenFoundException)
{
}
if (miniServer != null)
{
return(miniServer);
}
try
{
ServersCache.CacheLockForServersDictionary.EnterReadLock();
miniServer = ServersCache.FindMiniServerInListWithoutAffinity(ServersCache.ServersDictionary.Values.ToList <ServersCache.ServerInfo>(), versionNumber, needsExactVersionMatch);
}
finally
{
ServersCache.CacheLockForServersDictionary.ExitReadLock();
}
if (miniServer != null)
{
return(miniServer);
}
MiniServer oneMailboxServerForASite = ServersCache.GetOneMailboxServerForASite(null, versionNumber, needsExactVersionMatch);
ServersCache.UpdateMiniServerIntoCache(oneMailboxServerForASite);
return(oneMailboxServerForASite);
}
private static MiniServer GetDeterministicBackEndServerForASite(int versionNumber, string identifier, bool needsExactVersionMatch = false, ADObjectId adSiteId = null)
{
ADObjectId adobjectId = (adSiteId != null) ? adSiteId : ServersCache.LocalSiteId;
bool flag = ServersCache.IsLocalSite(adobjectId);
MiniServer miniServer = ServersCache.FindAndReturnMiniServerFromCacheForASite(adobjectId, versionNumber, identifier, needsExactVersionMatch);
if (miniServer != null)
{
return(miniServer);
}
if (flag)
{
if (ServersCache.SiteToServersDictionary.ContainsKey(adobjectId) && DateTime.UtcNow - ServersCache.LastRefreshTimeForLocalSiteCache <= ServersCache.RefreshInterval)
{
throw new ServerHasNotBeenFoundException(versionNumber, identifier, needsExactVersionMatch, adobjectId.Name);
}
lock (ServersCache.LockForLocalSiteDiscovery)
{
if (ServersCache.SiteToServersDictionary.ContainsKey(adobjectId) && DateTime.UtcNow - ServersCache.LastRefreshTimeForLocalSiteCache <= ServersCache.RefreshInterval)
{
MiniServer miniServer2 = ServersCache.FindAndReturnMiniServerFromCacheForASite(adobjectId, versionNumber, identifier, needsExactVersionMatch);
if (miniServer2 == null)
{
ServersCache.Tracer.TraceError(0L, "ServersCache: No server with the version number {0}, identifier '{1}', needsExactVersionMatch {2} and siteId.Name {3} in the cache for local site.", new object[]
{
versionNumber,
identifier,
needsExactVersionMatch,
adobjectId.Name
});
}
return(miniServer2);
}
ADPagedReader <MiniServer> adpagedReader = ServersCache.ReadLocalSiteMailboxServers();
List <ServersCache.ServerInfo> list = null;
if (adpagedReader == null)
{
throw new ServerHasNotBeenFoundException(versionNumber, identifier, needsExactVersionMatch, adobjectId.Name);
}
list = new List <ServersCache.ServerInfo>();
foreach (MiniServer miniServer3 in adpagedReader)
{
ServersCache.ServerInfo item = new ServersCache.ServerInfo(DateTime.UtcNow, miniServer3);
list.Add(item);
}
try
{
ServersCache.CacheLockForServersDictionary.EnterWriteLock();
foreach (ServersCache.ServerInfo serverInfo in list)
{
ServersCache.ServersDictionary[serverInfo.MiniServer.Fqdn] = serverInfo;
}
}
finally
{
ServersCache.CacheLockForServersDictionary.ExitWriteLock();
}
if (list.Count == 0)
{
throw new ServerHasNotBeenFoundException(versionNumber, identifier, needsExactVersionMatch, adobjectId.Name);
}
ServersCache.LastRefreshTimeForLocalSiteCache = DateTime.UtcNow;
try
{
ServersCache.CacheLockForSiteToServersDictionary.EnterWriteLock();
ServersCache.SiteToServersDictionary[adobjectId] = list;
}
finally
{
ServersCache.CacheLockForSiteToServersDictionary.ExitWriteLock();
}
MiniServer miniServer4 = ServersCache.FindAndReturnMiniServerFromCacheForASite(adobjectId, versionNumber, identifier, needsExactVersionMatch);
if (miniServer4 == null)
{
throw new ServerHasNotBeenFoundException(versionNumber, identifier, needsExactVersionMatch, adobjectId.Name);
}
return(miniServer4);
}
}
MiniServer oneMailboxServerForASite = ServersCache.GetOneMailboxServerForASite(adobjectId, versionNumber, needsExactVersionMatch);
ServersCache.UpdateMiniServerIntoCache(oneMailboxServerForASite);
return(oneMailboxServerForASite);
}