CODEWITHSUNDEEP
javaspring-bootrestasynchronous
Florian
Florian

Reputation: 197

How to call rest api and do not wait any response

I have this code

private Boolean doSomething() {
    // SOME CODE
    this.sync();
    return true;
}

public void sync() {
    RestTemplate restTemplate = restTemplate();
    restTemplate.exchange(batchHost, HttpMethod.GET, header(), String.class);
}

I don't need data from the rest call. it's batch execution service he take times. but for my doSomething function i don't need a response from sync to continue.

Today, when the rest call not working, not available... my function doSomething .... do nothing...

How to call rest service but continue without error doSomething() without errors ??

Thanks

I use java 11

Upvotes: 1

Views: 12839

Answers (4)

Alia
Alia

Reputation: 1

If you dont want a response from the methods you run async, then You can simply do the async portion inside completableFuture lambda method as follows, directly in your triggering endpoint and return 200 ok immediately. Note, if internal method may throw exceptions, you need to swallow that too in a try/catch to ensure it happens asynch. as well.

@GetMapping(value = "/trigger")
    public ResponseEntity<String> triggerMethod() throws Exception {
        

          CompletableFuture.runAsync(() -> {
              try {
                
                this.dosomething();

              } catch(Exception e) {e.printStackTrace();}

          });
          
        return new ResponseEntity<String>(HttpStatus.OK);
        
        
    }

However, if you require a response through other methods run asynchronously, then you will need to implement something like this example

Upvotes: 0

Sharad
Sharad

Reputation: 1058

You can use Spring WebFlux to build or consume API's in reactive and non-blocking manners. Here is the official documentation which explains this in detail: https://docs.spring.io/spring-framework/docs/current/reference/html/web-reactive.html

Upvotes: 0

Shawrup
Shawrup

Reputation: 2754

You can make the sync method call asynchronous. Spring provides easy way to do that. Add @EnableAsync in any of you Configuration class (i.e. Classes annotated with @Configuration). If you don't find any configuration class then add @EnableAsync in the class with @SpringBootApplication.

@SpringBootApplication
@EnableAsync
public class SpringbootApplication{
    public static void main(String[] args) {
        SpringApplication.run(SpringbootApplication.class, args);
    }
}

Then add @Async to your sync method. Your code will look like this.

@Async
public void sync() {
    RestTemplate restTemplate = restTemplate();
    restTemplate.exchange(batchHost, HttpMethod.GET, header(), String.class);
}

To make @Async work, this sync method need to be called from another class file. If you call sync from same class then sync method will not be asynchronous.

Upvotes: 6

MauroB
MauroB

Reputation: 580

You should not use RestTemplate to call REST API.

"Please, consider using the org.springframework.web.reactive.client.WebClient which has a more modern API and supports sync, async, and streaming scenarios."

https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/web/client/RestTemplate.html

Upvotes: 0

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