private void SetCurrentState(CircuitBreakerStateDescriptor newState)
{
if (stateDescriptor != newState)
{
stateDescriptor = newState;
logger.Event("CircuitBreakerTransition", ("circuitBreakerType", key),
("circuitBreakerState", newState));
}
}
public Task <CircuitBreakerStateDescriptor> GetLastStateAsync()
{
if (stateDescriptor == null)
{
stateDescriptor =
new CircuitBreakerStateDescriptor(CircuitBreakerState.Closed, Clock.Current.Now());
}
return(Task.FromResult(stateDescriptor));
}
public async Task SignalSuccessAsync()
{
await Task.Yield();
if (stateDescriptor?.State != CircuitBreakerState.Closed)
{
var newState = new CircuitBreakerStateDescriptor(stateDescriptor?.State == CircuitBreakerState.Open ? CircuitBreakerState.HalfOpen : CircuitBreakerState.Closed, Clock.Current.Now());
SetCurrentState(newState);
}
NotifyState();
}
public async Task SignalFailureAsync(TimeSpan expiry)
{
await Task.Yield();
var open = new CircuitBreakerStateDescriptor(CircuitBreakerState.Open, Clock.Current.Now(), expiry);
Clock.Current.Schedule(_ =>
{
if (ReferenceEquals(stateDescriptor, open))
{
var halfOpen = new CircuitBreakerStateDescriptor(CircuitBreakerState.HalfOpen, Clock.Current.Now());
SetCurrentState(halfOpen);
NotifyState();
}
}, expiry);
SetCurrentState(open);
NotifyState();
}
public CircuitBreakerStoragePartition(string key)
{
this.key = key;
subscribers = new ConcurrentSet <CircuitBreakerBrokerSubscriber>();
stateDescriptor = new CircuitBreakerStateDescriptor(CircuitBreakerState.Closed, Clock.Current.Now(), TimeSpan.FromMinutes(2));
}
private void StateChanged(CircuitBreakerStateDescriptor descriptor) => stateDescriptor = descriptor;