I would like to trigger a fallback from a @HystrixCommand Method based on my own criteria (checking for a specific response status).
My method basically acts as a client which calls a service in another URL (marked here as URL).
Here is my code:
@HystrixCommand(fallbackMethod="fallbackPerformOperation")
public Future<Object> performOperation(String requestString) throws InterruptedException {
return new AsyncResult<Object>() {
@Override
public Object invoke() {
Client client = null;
WebResource webResource = null;
ClientResponse response =null;
String results = null;
try{
client = Client.create();
webResource = client.resource(URL);
client.setConnectTimeout(10000);
client.setReadTimeout(10000);
response = webResource.type("application/xml")
.post(ClientResponse.class, requestString);
logger.info("RESPONSE STATUS: " + response.getStatus());
if (response.getStatus() != 200) {
webResource = null;
logger.error(" request failed with the HTTP Status: " + response.getStatus());
throw new RuntimeException(" request failed with the HTTP Status: "
+ response.getStatus());
}
results = response.getEntity(String.class);
} finally {
client.destroy();
webResource = null;
}
return results;
}
};
}
This triggers the fallback Method fallbackPerformOperation() when the response status code is not 200 i.e. response.getStatus()!=200.
The fallback method returns a string which tells the user that the Request did not return a status of 200 and so it is falling back.
I want to know if I can trigger the fallback without having to explicitly throw an exception inside my performOperation() Method.
Could I use @HystrixProperty? I know people mostly use it for timeouts and volume thresholds but could I write a custom @HystrixProperty that checks if the response status is 200 or not within my Method?
