A controller that mixes synchronous and asynchronous requests from a single endpoint.

MultiModeTestController.java

package tv.nativ.mio.publish.common.controller;

import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.concurrent.Callable;


/**
 * A controller that can mixes synchronous and asynchronous responses.
 *
 * @author emerson
 */
//@Controller
public class MultiModeTestController {

	@RequestMapping("/multiModeController")
	public Object handleRequest(@RequestParam(required = false, defaultValue = "no") String async) {

		if (async.equals("no")) {
			return newResponseEntity("sync");
		}

		return new Callable<ResponseEntity<String>>() {

			@Override public ResponseEntity<String> call() throws Exception {

				return newResponseEntity("async");
			}
		};
	}

	private ResponseEntity<String> newResponseEntity(String body) {

		HttpHeaders httpHeaders = new HttpHeaders();
		httpHeaders.setContentType(MediaType.TEXT_PLAIN);

		return new ResponseEntity<>(body, httpHeaders, HttpStatus.OK);
	}
}