public async Task VerifyConnectivityAsync()
{
// As long as there is a fresh routing table, we consider we can route to these servers.
try
{
await _routingTableManager.EnsureRoutingTableForModeAsync(Simple.Mode, Simple.Database,
Simple.Bookmark);
}
catch (ServiceUnavailableException e)
{
throw new ServiceUnavailableException(
"Unable to connect to database, " +
"ensure the database is running and that there is a working network connection to it.", e);
}
}
public async Task VerifyConnectivityAsync()
{
// As long as there is a fresh routing table, we consider we can route to these servers.
try
{
var database = await SupportsMultiDbAsync().ConfigureAwait(false) ? "system" : null;
await _routingTableManager.EnsureRoutingTableForModeAsync(Simple.Mode, database,
Simple.Bookmark).ConfigureAwait(false);
}
catch (ServiceUnavailableException e)
{
throw new ServiceUnavailableException(
"Unable to connect to database, " +
"ensure the database is running and that there is a working network connection to it.", e);
}
}
public async Task <IConnection> AcquireConnectionAsync(AccessMode mode)
{
await _routingTableManager.EnsureRoutingTableForModeAsync(mode).ConfigureAwait(false);
while (true)
{
Uri uri;
switch (mode)
{
case AccessMode.Read:
uri = _loadBalancingStrategy.SelectReader(_routingTableManager.RoutingTable.Readers);
break;
case AccessMode.Write:
uri = _loadBalancingStrategy.SelectWriter(_routingTableManager.RoutingTable.Writers);
break;
default:
throw new InvalidOperationException($"Unknown access mode {mode}");
}
if (uri == null)
{
// no server known to routingTable
break;
}
IConnection conn = await CreateClusterConnectionAsync(uri, mode).ConfigureAwait(false);
if (conn != null)
{
return(conn);
}
//else connection already removed by clusterConnection onError method
}
throw new SessionExpiredException($"Failed to connect to any {mode.ToString().ToLower()} server.");
}