protected override bool TryLoadFromCache(string url, JsonOperationContext context)
{
var serverHash = ServerHash.GetServerHash(url);
var cachedTopology = ClusterTopologyLocalCache.TryLoadClusterTopologyFromLocalCache(serverHash, context);
if (cachedTopology == null)
{
return(false);
}
_nodeSelector = new NodeSelector(new Topology
{
Nodes = new List <ServerNode>(
from member in cachedTopology.Topology.Members
select new ServerNode
{
Url = member.Value,
ClusterTag = member.Key
}
)
});
return(true);
}
public override async Task <bool> UpdateTopologyAsync(ServerNode node, int timeout, bool forceUpdate = false)
{
if (Disposed)
{
return(false);
}
var lockTaken = await _clusterTopologySemaphore.WaitAsync(timeout).ConfigureAwait(false);
if (lockTaken == false)
{
return(false);
}
try
{
if (Disposed)
{
return(false);
}
using (ContextPool.AllocateOperationContext(out JsonOperationContext context))
{
var command = new GetClusterTopologyCommand();
await ExecuteAsync(node, null, context, command, shouldRetry : false).ConfigureAwait(false);
var serverHash = ServerHash.GetServerHash(node.Url);
ClusterTopologyLocalCache.TrySavingTopologyToLocalCache(serverHash, command.Result, context);
var results = command.Result;
var newTopology = new Topology
{
Nodes = new List <ServerNode>(
from member in results.Topology.Members
select new ServerNode
{
Url = member.Value,
ClusterTag = member.Key
}
)
};
if (_nodeSelector == null)
{
_nodeSelector = new NodeSelector(newTopology);
if (_readBalanceBehavior == ReadBalanceBehavior.FastestNode)
{
_nodeSelector.ScheduleSpeedTest();
}
}
else if (_nodeSelector.OnUpdateTopology(newTopology, forceUpdate: forceUpdate))
{
DisposeAllFailedNodesTimers();
if (_readBalanceBehavior == ReadBalanceBehavior.FastestNode)
{
_nodeSelector.ScheduleSpeedTest();
}
}
OnTopologyUpdated(newTopology);
}
}
finally
{
_clusterTopologySemaphore.Release();
}
return(true);
}
public override async Task <bool> UpdateTopologyAsync(UpdateTopologyParameters parameters)
{
if (parameters is null)
{
throw new ArgumentNullException(nameof(parameters));
}
if (Disposed)
{
return(false);
}
var lockTaken = await _clusterTopologySemaphore.WaitAsync(parameters.TimeoutInMs).ConfigureAwait(false);
if (lockTaken == false)
{
return(false);
}
try
{
if (Disposed)
{
return(false);
}
using (ContextPool.AllocateOperationContext(out JsonOperationContext context))
{
var command = new GetClusterTopologyCommand(parameters.DebugTag);
await ExecuteAsync(parameters.Node, null, context, command, shouldRetry : false, sessionInfo : null, token : CancellationToken.None).ConfigureAwait(false);
ClusterTopologyLocalCache.TrySaving(TopologyHash, command.Result, Conventions, context);
var results = command.Result;
var newTopology = new Topology
{
Nodes = new List <ServerNode>(
from member in results.Topology.Members
select new ServerNode
{
Url = member.Value,
ClusterTag = member.Key
}
),
Etag = results.Etag
};
TopologyEtag = results.Etag;
if (_nodeSelector == null)
{
_nodeSelector = new NodeSelector(newTopology);
if (Conventions.ReadBalanceBehavior == ReadBalanceBehavior.FastestNode)
{
_nodeSelector.ScheduleSpeedTest();
}
}
else if (_nodeSelector.OnUpdateTopology(newTopology, forceUpdate: parameters.ForceUpdate))
{
DisposeAllFailedNodesTimers();
if (Conventions.ReadBalanceBehavior == ReadBalanceBehavior.FastestNode)
{
_nodeSelector.ScheduleSpeedTest();
}
}
OnTopologyUpdatedInvoke(newTopology);
}
}
catch (Exception)
{
if (Disposed == false)
{
throw;
}
}
finally
{
_clusterTopologySemaphore.Release();
}
return(true);
}