@Override
public <T> Future<T> invoke(
EventLoop eventLoop,
URI uri,
ClientOptions options,
ClientCodec codec,
Method method,
Object[] args)
throws Exception {
final CircuitBreaker circuitBreaker;
try {
circuitBreaker = mapping.get(eventLoop, uri, options, codec, method, args);
} catch (Throwable t) {
logger.warn("Failed to get a circuit breaker from mapping", t);
return delegate().invoke(eventLoop, uri, options, codec, method, args);
}
if (circuitBreaker.canRequest()) {
final Future<T> resultFut = delegate().invoke(eventLoop, uri, options, codec, method, args);
resultFut.addListener(
future -> {
if (future.isSuccess()) {
// reports success event
circuitBreaker.onSuccess();
} else {
circuitBreaker.onFailure(future.cause());
}
});
return resultFut;
} else {
// the circuit is tripped
// prepares a failed resultPromise
final Promise<T> resultPromise = eventLoop.newPromise();
resultPromise.setFailure(new FailFastException(circuitBreaker));
codec.prepareRequest(method, args, resultPromise);
// returns immediately without calling succeeding remote invokers
return resultPromise;
}
}
