Add WebFlux sample

Fixesh gh-857

samples/javaconfig/webflux/src/main/java/sample/SSEFluxWebConfig.java

@@ -0,0 +1,91 @@
+/*
+ * =============================================================================
+ *
+ *   Copyright (c) 2011-2014, The THYMELEAF team (http://www.thymeleaf.org)
+ *
+ *   Licensed under the Apache License, Version 2.0 (the "License");
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *   See the License for the specific language governing permissions and
+ *   limitations under the License.
+ *
+ * =============================================================================
+ */
+package sample;
+
+import org.thymeleaf.spring5.ISpringWebFluxTemplateEngine;
+import org.thymeleaf.spring5.SpringWebFluxTemplateEngine;
+import org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver;
+import org.thymeleaf.spring5.view.reactive.ThymeleafReactiveViewResolver;
+import org.thymeleaf.templatemode.TemplateMode;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class SSEFluxWebConfig {
+
+	// TODO * Once there is a Spring Boot starter for thymeleaf-spring5, there would be no
+	// need to have
+	// TODO that @EnableConfigurationProperties annotation or use it for declaring the
+	// beans down in the
+	// TODO "thymeleaf" section below.
+
+	private ApplicationContext applicationContext;
+
+	public SSEFluxWebConfig(final ApplicationContext applicationContext) {
+		super();
+		this.applicationContext = applicationContext;
+	}
+
+	/*
+	 * -------------------------------------- THYMELEAF CONFIGURATION
+	 * --------------------------------------
+	 */
+
+	// TODO * If there was a Spring Boot starter for thymeleaf-spring5 most probably some
+	// or all of these
+	// TODO resolver and engine beans would not need to be specifically declared here.
+
+	@Bean
+	public SpringResourceTemplateResolver thymeleafTemplateResolver() {
+
+		final SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();
+		resolver.setApplicationContext(this.applicationContext);
+		resolver.setPrefix("classpath:/templates/");
+		resolver.setSuffix(".html");
+		resolver.setTemplateMode(TemplateMode.HTML);
+		resolver.setCacheable(false);
+		resolver.setCheckExistence(true);
+		return resolver;
+
+	}
+
+	@Bean
+	public ISpringWebFluxTemplateEngine thymeleafTemplateEngine() {
+		// We override here the SpringTemplateEngine instance that would otherwise be
+		// instantiated by
+		// Spring Boot because we want to apply the SpringWebFlux-specific context
+		// factory, link builder...
+		final SpringWebFluxTemplateEngine templateEngine = new SpringWebFluxTemplateEngine();
+		templateEngine.setTemplateResolver(thymeleafTemplateResolver());
+		return templateEngine;
+	}
+
+	@Bean
+	public ThymeleafReactiveViewResolver thymeleafChunkedAndDataDrivenViewResolver() {
+		final ThymeleafReactiveViewResolver viewResolver = new ThymeleafReactiveViewResolver();
+		viewResolver.setTemplateEngine(thymeleafTemplateEngine());
+		viewResolver.setOrder(1);
+		viewResolver.setResponseMaxChunkSizeBytes(8192); // OUTPUT BUFFER size limit
+		return viewResolver;
+	}
+
+}