Hystrix is a library for dealing with faults and latency in a distributed system. It provides a mechanism for introducing latency tolerance and failover logic into your microservices.
To add Hystrix to your Spring Boot application, you need to add the following dependency to your pom.xml file:
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<dependency> <groupid>org.springframework.cloud</groupid> <artifactid>spring-cloud-starter-netflix-hystrix</artifactid> </dependency> |
Next, you need to create a Hystrix command for your car service. A Hystrix command is a unit of work that is executed in a separate thread and can be monitored for latency and failures.
Here is an example of a Hystrix command for the car service:
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@Service public class CarService { @HystrixCommand(fallbackMethod = "getCarFallback") public Car getCarById(long id) { // Implementation goes here } public Car getCarFallback(long id) { // Fallback implementation goes here } } |
In the code above, the getCarById method is annotated with @HystrixCommand, which indicates that it should be executed as a Hystrix command. If the method fails, the getCarFallback method will be executed as a fallback.
Here is an example of a REST controller for the car service using the Hystrix command:
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@RestController @RequestMapping("/api/cars") public class CarController { private final CarService carService; public CarController(CarService carService) { this.carService = carService; } @GetMapping("/{id}") public Car getCarById(@PathVariable long id) { return carService.getCarById(id); } } |
In the code above, the getCarById method invokes the getCarById method from the CarService class, which is executed as a Hystrix command.
That’s it! Your car service is now set up with Hystrix for fault tolerance and latency tolerance.