test.java

//原来的业务代码：
return yourService.exec(params);

//改成：

return new ServiceCommand(yourService, params).execute();


public class ServiceCommand extends HystrixCommand{
	yourService;
	params;
	
	
	HystrixThreadPoolProperties.Setter A系统setter =          HystrixThreadPoolProperties.Setter().withCoreSize(50).withMaxQueueSize(200).withQueueSizeRejectionThreshold(50);
	HystrixCommandProperties.Setter A系统commandSetter = HystrixCommandProperties.Setter()
	.withCircuitBreakerForceClosed(true).withExecutionTimeoutInMilliseconds(3000).withExecutionIsolationSemaphoreMaxConcurrentRequests(50);

	B系统setter
	B系统commandSetter
	
	... 
	
	public ServiceCommand(yourService, params){
		super(
			Setter.withGroupKey(HystrixCommandGroupKey.Factory.asKey(系统号))
                .andCommandKey(HystrixCommandKey.Factory.asKey(系统号))
                .andThreadPoolPropertiesDefaults(该系统对应的线程池配置)
                .andCommandPropertiesDefaults(该系统对应的command配置)
			);
	
		this.yourService = yourService;
		this.params = params;
	}
	
	@Override
    protected Object run() {
        return yourService.exec(params);
    }
}