need help : featurehub down scenario

[pontamilselvan]

Hi ,

i referred below example and created FetureHubSource singleton class. Its is not a springboot project , its web application with servlets only. i have loaded FetureHubSource .java(made as singleton) at startup. all working fine except featurehub down scenario.

i was testing the scenario that when featurehub is down whether values are picking from local cache or not. if i am making featurehub down or stop , its stuck and no values are picking . flow is stuck in below line... what i am missing here?

FeatureHub featureHub =  FeatureHubSource.getInstance();
                
                ClientContext fhClient = featureHub.fhClient().userKey(user).attr("type", type).build().get();

FeatureHubSource.java

import org.apache.log4j.Logger;

import io.featurehub.client.ClientContext;
import io.featurehub.client.ClientFeatureRepository;
import io.featurehub.client.EdgeFeatureHubConfig;
import io.featurehub.client.EdgeService;
import io.featurehub.client.FeatureRepositoryContext;
import io.featurehub.client.GoogleAnalyticsCollector;
import io.featurehub.client.interceptor.SystemPropertyValueInterceptor;
import io.featurehub.client.jersey.GoogleAnalyticsJerseyApiClient;
import io.featurehub.client.jersey.JerseyClient;

public class FeatureHubSource implements FeatureHub {
	
	 private final FeatureRepositoryContext repository;
	  private final EdgeFeatureHubConfig config;

	  static final Logger   cxmLogger = Logger.getLogger("logger");
	  private static FeatureHubSource instance = null;
	  
	  private FeatureHubSource() {
		  
		   String featureHubUrl = "http://localhost:8080/";	
		   String sdkKey = "default/792bfc85-a336-4f32-9402-b20483665633/dah6a36NQgXaZZVblVRg4jd12evn0JzTdqOC6Xa7KB1tPSl37fsr9nmsqLMz9LTLZ06TDuNcv5mTCVeR";
		    

		    config = new EdgeFeatureHubConfig(featureHubUrl, sdkKey);

		    repository = new ClientFeatureRepository(5);
		    
		    config.setRepository(repository);
		    config.init();
		  }



	  public static FeatureHubSource getInstance() {
	    if (instance == null) {
	    	cxmLogger.info("Creating new FeatureHubSource");
	    	FeatureHubSource.instance = new FeatureHubSource();
	    }
	    return FeatureHubSource.instance;
	  }	
	


 

  @Override
  public ClientContext fhClient() {
    return config.newContext();
  }

  @Override
  public FeatureRepositoryContext getRepository() {
    return repository;
  }
}

FeatureHub.java

import io.featurehub.client.ClientContext;
import io.featurehub.client.EdgeService;
import io.featurehub.client.FeatureRepositoryContext;

public interface FeatureHub {
  ClientContext fhClient();
  FeatureRepositoryContext getRepository();


}

[rvowles]

Hey there!

The problem is you are using a Server Evaluated key for a web server, and thus every time the context changes it must block and change the context for the whole repository. A client evaluated key will bring all of the necessary context and strategies down to your web server app and any context change will be evaluated locally. The "build" method just returns straight away.

I hope this helps?