private void UpdateSubchannelState(Subchannel subchannel, SubchannelState state)
{
var index = FindSubchannel(_addressSubchannels, subchannel);
if (index == null)
{
SubchannelsLoadBalancerLog.IgnoredSubchannelStateChange(_logger, subchannel.Id);
return;
}
SubchannelsLoadBalancerLog.ProcessingSubchannelStateChanged(_logger, subchannel.Id, state.State, state.Status);
UpdateBalancingState(state.Status);
if (state.State == ConnectivityState.TransientFailure || state.State == ConnectivityState.Idle)
{
SubchannelsLoadBalancerLog.RefreshingResolverForSubchannel(_logger, subchannel.Id, state.State);
Controller.RefreshResolver();
}
if (state.State == ConnectivityState.Idle)
{
SubchannelsLoadBalancerLog.RequestingConnectionForSubchannel(_logger, subchannel.Id, state.State);
subchannel.RequestConnection();
}
}
internal void RaiseStateChanged(ConnectivityState state, Status status)
{
SubchannelLog.SubchannelStateChanged(_logger, Id, state, status);
if (_stateChangedRegistrations.Count > 0)
{
var subchannelState = new SubchannelState(state, status);
foreach (var registration in _stateChangedRegistrations)
{
registration.Invoke(subchannelState);
}
}
}
private void UpdateSubchannelState(Subchannel subchannel, SubchannelState state)
{
if (_subchannel != subchannel)
{
PickFirstBalancerLog.IgnoredSubchannelStateChange(_logger, subchannel.Id);
return;
}
PickFirstBalancerLog.ProcessingSubchannelStateChanged(_logger, subchannel.Id, state.State, state.Status);
switch (state.State)
{
case ConnectivityState.Ready:
UpdateChannelState(state.State, new PickFirstPicker(_subchannel));
break;
case ConnectivityState.Idle:
_controller.RefreshResolver();
// Pick first load balancer waits until a request is made before establishing a connection.
// Return picker that will request a connection on pick.
UpdateChannelState(state.State, new RequestConnectionPicker(_subchannel));
break;
case ConnectivityState.Connecting:
UpdateChannelState(state.State, EmptyPicker.Instance);
break;
case ConnectivityState.TransientFailure:
UpdateChannelState(state.State, new ErrorPicker(state.Status));
break;
case ConnectivityState.Shutdown:
UpdateChannelState(state.State, EmptyPicker.Instance);
_subchannel = null;
break;
}
}
public void Invoke(SubchannelState state)
{
_callback(state);
}