internal static async Task ImplementationAsync(Func<Task> action, IEnumerable<ExceptionPredicate> shouldRetryPredicates, ICircuitBreakerState breakerState, bool continueOnCapturedContext)
{
if (breakerState.IsBroken)
{
throw new BrokenCircuitException("The circuit is now open and is not allowing calls.", breakerState.LastException);
}
try
{
await action().ConfigureAwait(continueOnCapturedContext);
breakerState.Reset();
}
catch (Exception ex)
{
if (!shouldRetryPredicates.Any(predicate => predicate(ex)))
{
throw;
}
breakerState.TryBreak(ex);
throw;
}
}
void ICircuitBreakerSwitch.CloseCircuit(ICircuitBreakerState from)
{
var tripped = TryToTrip(from, _closedState);
if (tripped)
{
EventHandler?.OnCircuitClosed(this);
}
}
void ICircuitBreakerSwitch.AttemptToCloseCircuit(ICircuitBreakerState from)
{
var tripped = TryToTrip(from, _halfOpenedState);
if (tripped)
{
EventHandler?.OnCircuitHalfOpened(this);
}
}
void ICircuitBreakerSwitch.OpenCircuit(ICircuitBreakerState from)
{
var tripped = TryToTrip(from, _openedState);
if (tripped)
{
EventHandler?.OnCircuitOpened(this);
}
}
private bool TryToTrip(ICircuitBreakerState from, ICircuitBreakerState to)
{
if (Interlocked.CompareExchange(ref _currentState, to, from) == from)
{
to.Enter();
return(true);
}
return(false);
}
// The constructor.
public CircuitBreaker(int failureCountThreshold, int openTimeoutInSeconds)
{
state = closedState;
failureCount = 0L;
failureThreshold = failureCountThreshold;
openTimeoutSeconds = openTimeoutInSeconds;
timer = new System.Timers.Timer(1000);
timer.Elapsed += TimerElapsed;
timerSecondsElapsed = 0L;
}
private void Reset()
{
lock (StateTransitionLockerObject)
{
// Must be from half-open.
if (state == halfOpenState)
{
Interlocked.Exchange(ref failureCount, 0L);
state = closedState;
Closed?.Invoke(this, EventArgs.Empty);
}
}
}
private void AttemptReset()
{
lock (StateTransitionLockerObject)
{
// Must be from open.
if (state == openState)
{
StopTimer();
state = halfOpenState;
HalfOpen?.Invoke(this, EventArgs.Empty);
}
}
}
private void TripBreaker()
{
lock (StateTransitionLockerObject)
{
// Must be from closed or half-open.
if (state != openState)
{
Interlocked.Exchange(ref failureCount, 0L);
state = openState;
Open?.Invoke(this, EventArgs.Empty);
RestartTimer();
}
}
}
public async Task InvokeThroughAsync(ICircuitBreakerState state, Func <Task> func, TimeSpan timeout, CancellationToken cancellationToken = default(CancellationToken))
{
try
{
await InvokeAsync(func, timeout, cancellationToken);
}
catch (Exception)
{
state.InvocationFails();
throw;
}
state.InvocationSucceeds();
}
public void InvokeThrough(ICircuitBreakerState state, Action action, TimeSpan timeout)
{
try
{
Invoke(action, timeout);
}
catch (System.Exception)
{
state.InvocationFails();
throw;
}
state.InvocationSucceeds();
}
public async Task InvokeThroughAsync(ICircuitBreakerState state, Func<Task> func, TimeSpan timeout)
{
try
{
await InvokeAsync(func, timeout);
}
catch (System.Exception)
{
state.InvocationFails();
throw;
}
state.InvocationSucceeds();
}
private Metric CreateCounter(ICircuitBreakerState circuitBreakerState)
{
return(new Metric
{
gauge = new Gauge
{
value = circuitBreakerState.ClosedPct,
},
label = new List <LabelPair> {
new LabelPair {
name = "policy", value = circuitBreakerState.Policy
}
}
});
}
public T InvokeThrough<T>(ICircuitBreakerState state, Func<T> func, TimeSpan timeout)
{
T result;
try
{
result = Invoke(func, timeout);
}
catch (System.Exception)
{
state.InvocationFails();
throw;
}
state.InvocationSucceeds();
return result;
}
internal static async Task ImplementationAsync( Func< Task > action, ExceptionHandler canHandle, ICircuitBreakerState breaker )
{
if( breaker.IsBroken )
throw breaker.LastException;
try
{
await action().ConfigureAwait( false );
breaker.Reset();
}
catch( Exception ex )
{
if( !canHandle( ex ) )
throw;
breaker.TryBreak( ex );
throw;
}
}
internal static void Implementation( Action action, ExceptionHandler canHandle, ICircuitBreakerState breaker )
{
if( breaker.IsBroken )
throw breaker.LastException;
try
{
action();
breaker.Reset();
}
catch( Exception ex )
{
if( !canHandle( ex ) )
throw;
breaker.TryBreak( ex );
throw;
}
}
public async Task<T> InvokeThroughAsync<T>(ICircuitBreakerState state, Func<Task<T>> func, TimeSpan timeout)
{
Task<T> task;
try
{
task = InvokeAsync(func, timeout);
await task;
}
catch (System.Exception)
{
state.InvocationFails();
throw;
}
state.InvocationSucceeds();
return await task;
}
public async Task <T> InvokeThroughAsync <T>(ICircuitBreakerState state, Func <Task <T> > func, TimeSpan timeout, CancellationToken cancellationToken = default(CancellationToken))
{
Task <T> task;
try
{
task = InvokeAsync(func, timeout, cancellationToken);
await task;
}
catch (Exception)
{
state.InvocationFails();
throw;
}
state.InvocationSucceeds();
return(await task);
}
internal static async Task ImplementationAsync(Func<CancellationToken, Task> action, CancellationToken cancellationToken, IEnumerable<ExceptionPredicate> shouldHandlePredicates, ICircuitBreakerState breakerState, bool continueOnCapturedContext)
{
cancellationToken.ThrowIfCancellationRequested();
if (breakerState.IsBroken)
{
throw new BrokenCircuitException("The circuit is now open and is not allowing calls.", breakerState.LastException);
}
try
{
await action(cancellationToken).ConfigureAwait(continueOnCapturedContext);
breakerState.Reset();
}
catch (Exception ex)
{
if (cancellationToken.IsCancellationRequested)
{
if (ex is OperationCanceledException && ((OperationCanceledException) ex).CancellationToken == cancellationToken)
{
throw;
}
cancellationToken.ThrowIfCancellationRequested();
}
if (!shouldHandlePredicates.Any(predicate => predicate(ex)))
{
throw;
}
breakerState.TryBreak(ex);
throw;
}
}
internal static void Implementation(Action action, IEnumerable<ExceptionPredicate> shouldRetryPredicates, ICircuitBreakerState breakerState)
{
if (breakerState.IsBroken)
{
throw new BrokenCircuitException("The circuit is now open and is not allowing calls.", breakerState.LastException);
}
try
{
action();
breakerState.Reset();
}
catch (Exception ex)
{
if (!shouldRetryPredicates.Any(predicate => predicate(ex)))
{
throw;
}
breakerState.TryBreak(ex);
throw;
}
}
internal static async Task ImplementationAsync(Func <Task> action, IEnumerable <ExceptionPredicate> shouldRetryPredicates, ICircuitBreakerState breakerState)
{
if (breakerState.IsBroken)
{
throw new BrokenCircuitException("The circuit is now open and is not allowing calls.", breakerState.LastException);
}
try
{
await action().NotOnCapturedContext();
breakerState.Reset();
}
catch (Exception ex)
{
if (!shouldRetryPredicates.Any(predicate => predicate(ex)))
{
throw;
}
breakerState.TryBreak(ex);
throw;
}
}
internal static void Implementation(Action action, ExceptionHandler canHandle, ICircuitBreakerState breaker)
{
if (breaker.IsBroken)
{
throw breaker.LastException;
}
try
{
action();
breaker.Reset();
return;
}
catch (Exception ex)
{
if (!canHandle(ex))
{
throw;
}
breaker.TryBreak(ex);
throw;
}
}
public void HalfCloseCircuit(ICircuitBreakerState from)
{
SwitchState(from, _halfOpen);
}
internal static void Implementation(Action action, IEnumerable <ExceptionPredicate> shouldRetryPredicates, ICircuitBreakerState breakerState)
{
if (breakerState.IsBroken)
{
throw new BrokenCircuitException("The circuit is now open and is not allowing calls.", breakerState.LastException);
}
try
{
action();
breakerState.Reset();
}
catch (Exception ex)
{
if (!shouldRetryPredicates.Any(predicate => predicate(ex)))
{
throw;
}
breakerState.TryBreak(ex);
throw;
}
}
public void OpenCircuit(ICircuitBreakerState from)
{
SwitchState(from, _open);
}
public CircultBreaker(ICircuitBreakerState state)
{
_state = state;
}
void ICircuitBreakerSwitch.CloseCircuit(ICircuitBreakerState from)
{
Trip(from, _closedState);
}
public Entry(ICircuitBreakerState circuitBreakerState, Task task)
{
CircuitBreakerState = circuitBreakerState;
Task = task;
}
void ICircuitBreakerSwitch.AttemptToCloseCircuit(ICircuitBreakerState from)
{
Trip(from, _halfOpenedState);
}
public CircuitBreakerStateLock(ICircuitBreakerState inner)
{
_inner = inner;
}
public CircuitBreaker(ICircuitBreakerState circuitBreakerState)
{
_circuitBreakerstate = circuitBreakerState;
}
internal static async Task ImplementationAsync(Func <CancellationToken, Task> action, CancellationToken cancellationToken, IEnumerable <ExceptionPredicate> shouldHandlePredicates, ICircuitBreakerState breakerState, bool continueOnCapturedContext)
{
cancellationToken.ThrowIfCancellationRequested();
if (breakerState.IsBroken)
{
throw new BrokenCircuitException("The circuit is now open and is not allowing calls.", breakerState.LastException);
}
try
{
await action(cancellationToken).ConfigureAwait(continueOnCapturedContext);
breakerState.Reset();
}
catch (Exception ex)
{
if (cancellationToken.IsCancellationRequested)
{
if (ex is OperationCanceledException && ((OperationCanceledException)ex).CancellationToken == cancellationToken)
{
throw;
}
cancellationToken.ThrowIfCancellationRequested();
}
if (!shouldHandlePredicates.Any(predicate => predicate(ex)))
{
throw;
}
breakerState.TryBreak(ex);
throw;
}
}
public void CloseCircuit(ICircuitBreakerState from)
{
SwitchState(from, _closed);
}
public CircuitBreakerStateLock(ICircuitBreakerState inner)
{
_inner = inner;
}
void ICircuitBreakerSwitch.OpenCircuit(ICircuitBreakerState from)
{
Trip(from, _openedState);
}
