How to force a circuit breaker to open?

[Rebecca Relyea]

Hello,

I would like to programmatically force a circuit breaker to open for a particular group.  I thought I might be able to do that by setting the config on a command in a group to force open, and running that command.  However, that doesn't seem to work.  Is this possible?  Here's the test I tried that fails on the 2nd assertEquals call.

import com.netflix.hystrix.HystrixCommand;
import com.netflix.hystrix.HystrixCommandGroupKey;
import com.netflix.hystrix.HystrixCommandProperties;
import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class ForceCircuitBreakerCommandTest {

    @Test
    public void testForceOpen(){

        assertEquals(Boolean.TRUE, new FakeCommand().execute());

        new OpenCircuitBreakerCommand().execute();

        assertEquals(Boolean.FALSE, new FakeCommand().execute());

    }

    private class FakeCommand extends HystrixCommand<Boolean> {

        public FakeCommand(){
            super(Setter.withGroupKey(HystrixCommandGroupKey.Factory.asKey("TestGroup")));
        }

        @Override
        public Boolean run(){return Boolean.TRUE;}

        @Override
        public Boolean getFallback() {return Boolean.FALSE;}
    }

    private class OpenCircuitBreakerCommand extends HystrixCommand<Boolean> {

        public OpenCircuitBreakerCommand(){
            super(Setter.withGroupKey(HystrixCommandGroupKey.Factory.asKey("TestGroup"))
                    .andCommandPropertiesDefaults(HystrixCommandProperties.Setter()
                                    .withCircuitBreakerForceOpen(true)));
        }

        @Override
        public Boolean run(){return Boolean.TRUE;}

        @Override
        public Boolean getFallback() {return Boolean.FALSE;}
    }
}

[Senthilkumar Gopal]

Hi Rebecca,

 

 I have set custom properties such as "hystrix.command.HystrixCommandKey.circuitBreaker.forceOpen" using ConfigurationManager.getConfigInstance().setProperty("hystrix.command.HystrixCommandKey.circuitBreaker.forceOpen", true); Configuration Manager is the Archaius instance that is used internally "import com.netflix.config.ConfigurationManager;"

[Rebecca Relyea]

That worked - thank you!  If you would like to post your answer on Stackoverflow, where I asked the same question, I will accept your answer.  Here's my StackOverflow question: http://stackoverflow.com/questions/29165654/how-to-force-a-hystrix-circuit-breaker-open

And here is my new passing test:

import com.netflix.hystrix.HystrixCommand;
import com.netflix.hystrix.HystrixCommandGroupKey;
import org.junit.Test;
import static org.junit.Assert.assertEquals;

import com.netflix.config.ConfigurationManager;

public class ForceCircuitBreakerCommandTest {

    @Test
    public void testForceOpen(){

        assertEquals(Boolean.TRUE, new FakeCommand().execute());

        ConfigurationManager.getConfigInstance().setProperty("hystrix.command.FakeCommand.circuitBreaker.forceOpen", true);

        assertEquals(Boolean.FALSE, new FakeCommand().execute());

    }

    private class FakeCommand extends HystrixCommand<Boolean> {

        public FakeCommand(){
            super(Setter.withGroupKey(HystrixCommandGroupKey.Factory.asKey("TestGroup")));
        }

        @Override
        public Boolean run(){return Boolean.TRUE;}

        @Override
        public Boolean getFallback() {return Boolean.FALSE;}
    }
}

[Senthilkumar Gopal]

Hi Rebecca,

  Glad to hear that worked. I have replied on SO as well. good luck!

Thanks

senthilkumar g

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