Merge pull request #9873 from maryarm/BAEL-4107

BAEL-4107: Spring MVC Async vs Spring WebFlux

spring-5-webflux/.gitignore

@@ -1,2 +1,2 @@
 # Files #
-*.log
+*.log

spring-5-webflux/src/main/java/com/baeldung/spring/asyncvsflux/AsyncVsWebFluxApp.java

@@ -0,0 +1,11 @@
+package com.baeldung.spring.asyncvsflux;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class AsyncVsWebFluxApp {
+    public static void main(String[] args) {
+        SpringApplication.run(AsyncVsWebFluxApp.class, args);
+    }
+}

spring-5-webflux/src/main/java/com/baeldung/spring/asyncvsflux/WebFluxController.java

@@ -0,0 +1,17 @@
+package com.baeldung.spring.asyncvsflux;
+
+import java.time.Duration;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import reactor.core.publisher.Mono;
+
+@RestController
+public class WebFluxController {
+
+    @GetMapping("/flux_result")
+    public Mono<String> getResult(ServerHttpRequest request) {
+       return Mono.defer(() -> Mono.just("Result is ready!"))
+         .delaySubscription(Duration.ofMillis(500));
+    }
+}

spring-5-webflux/src/main/java/com/baeldung/spring/asyncvsflux/WebFluxFilter.java

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+package com.baeldung.spring.asyncvsflux;
+
+import java.time.Duration;
+import org.springframework.stereotype.Component;
+import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.server.WebFilterChain;
+import reactor.core.publisher.Mono;
+
+@Component
+public class WebFluxFilter implements org.springframework.web.server.WebFilter {
+
+    @Override
+    public Mono<Void> filter(ServerWebExchange serverWebExchange, WebFilterChain webFilterChain) {
+        return Mono
+          .delay(Duration.ofMillis(200))
+          .then(
+            webFilterChain.filter(serverWebExchange)
+          );
+    }
+}

spring-boot-modules/spring-boot-mvc-3/src/main/java/com/baeldung/asyncvsflux/AsyncController.java

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+package com.baeldung.asyncvsflux;
+
+import java.util.concurrent.CompletableFuture;
+import javax.servlet.http.HttpServletRequest;
+import org.springframework.scheduling.annotation.Async;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class AsyncController {
+
+    @GetMapping("/async_result")
+    @Async
+    public CompletableFuture<String> getResultAsyc(HttpServletRequest request) {
+        try {
+            Thread.sleep(500);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        return CompletableFuture.completedFuture("Result is ready!");
+    }
+
+}

spring-boot-modules/spring-boot-mvc-3/src/main/java/com/baeldung/asyncvsflux/AsyncFilter.java

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+package com.baeldung.asyncvsflux;
+
+import java.io.IOException;
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import org.springframework.stereotype.Component;
+
+@Component
+public class AsyncFilter implements Filter {
+
+    @Override
+    public void init(FilterConfig filterConfig) throws ServletException {
+
+    }
+
+    @Override
+    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
+        try {
+            Thread.sleep(200);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        filterChain.doFilter(servletRequest, servletResponse);
+    }
+
+    @Override
+    public void destroy() {
+
+    }
+}

spring-boot-modules/spring-boot-mvc-3/src/main/java/com/baeldung/asyncvsflux/AsyncVsWebFluxApp.java

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+package com.baeldung.asyncvsflux;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.scheduling.annotation.EnableAsync;
+
+@SpringBootApplication
+@EnableAsync
+public class AsyncVsWebFluxApp {
+    public static void main(String[] args) {
+        SpringApplication.run(AsyncVsWebFluxApp.class, args);
+    }
+}