Re: [HystrixOSS] How to configure Hystrix annotations

[Matt Jacobs]

Brandon - Can you open an issue on Github and cc @dmgcodevil?  We don't use any of the annotation support internally, so I don't have a great answer off the top of my head.  @dmgcodevil is the primary contributor to hystrix-javanica, and should be able to provide better assistance than me.

-Matt

On Thu, May 11, 2017 at 11:58 AM, Brandon <do...@live.ca> wrote:

I'm implementing a circuit breaker pattern with Hystrix. It seems to be working, but now I want to fetch certain Hystrix properties from my application properties with prefixes.

It looks like I should be using Archaius ConfigurationManager  but the wiki is all words and little code. This Q&A comes close but I don't understand their implementation (http://stackoverflow.com/questions/35085617/how-to-configure-hystrix-annotations-from-property-file).

My current circuit breaker looks like so:

    @HystrixCommand(fallbackMethod = "enroll", commandProperties ={
        @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "650")
    }
    public ResponseEntity<byte[]> EnrollReq (params....){
        //code
    }

    public ResponseEntity<byte[]> enroll(params...){
       //return error status
    }

I want to fetch the timeoutInMilliseconds from my application.properties which has this in it:

    Hystrix.Enroll.TimeoutInMilliseconds=650

I've created a specific class for HystrixCommandProperties:

    @ConfigurationProperties(prefix = "Hystrix.Enroll")
    @Data
    public class HystrixCommandProperties {
        private int TimeoutInMilliseconds
    }

I'm definitely missing some sort of connection between the stored spring configuration and the Hystrix syntax. I want the value = "650" in my circuit breaker to use the Hystrix.Enroll.TimeoutInMilliseconds instead.

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[Shakir PM]

I am also looking for same kind of implementation. Let me know if you are able to sortout. 

Thanks

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[Brandon]

Hey I ended up figuring it out. Basically making a POJO to take the variables from properties and apply them where they need to go.

Main Class:

@ControllerRuntimeProfiling(prefix = "enroll", logger = RequestLogger.class)    
@HystrixCommand(fallbackMethod = "enroll")

    public ResponseEntity<byte[]> EnrollReq (params....){
        //code
    }

    public ResponseEntity<byte[]> enroll(params...){

       //return error status and logs
    }

Hystrix Command Properties:

@Data
public class HystrixcommandProperties {

private int timeoutInMilli = 5000;
private int maxConReq = 200;

//logger if wanted

public HystrixCommandProperties init(String name){

ConfigurationManager.getConfigInstance().setProperty(String.format("hystrix.command.$s.excution.isolation.thread.timeout", name), timeoutInMilli);
//same for conreq

//logger if you want

return this;

}

}

HystrixConfig (Bean creation):

@Configuration
public class HystrixConfig {

@Bean
@ConfigurationProperties(prefix = "Hystrix.Enroll")
public HystrixCommandProperties enrollHystrixProperties(){

return new HystrixCommandProperties().init("processEnrollmentRequest");

}
//more beans here if needed

}

And then you also add the properties as required. Make sure to add them to staging and dev as well. The code was re-typed so I apologize for any typing mistakes.

[Shakir PM]

Thanks for reply. Just one question, 

what is $s in  String.format("hystrix.command.$s.excution.isolation.thread.timeout", name) ? And this is at global level or individual method level ? 

[Brandon]

Sorry that should be %s. The configuration manager handles the connections. I think it's method level. My variables are global in the properties file.