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.gitignore

@@ -14,3 +14,4 @@ bin/
 .settings
 .classpath
 .factorypath
+.vscode

README.md

@@ -2,21 +2,39 @@
 
 Test micronaut web application.
 
+## Container
 
-## Usage
-
-### Build application container
+### Build container
 
 ```shell
 docker build -t hellomicronaut .
+```
 
+### Run container 
+
+```shell
 docker run --name hello1 -p 8080:8080 hellomicronaut
 ```
 
+## Development
 
-### Test with browser
+Requires Java JDK version 11+.
 
-Connect to the container on the specified port:
+### Build 
+
+```shell
+./gradlew build
+```
+
+### Run 
+
+```shell
+./gradlew run -t
+```
+
+
+## Test with browser
+
+Connect to the container or localhost on the specified port:
 
 <http://localhost:8080/>
-

build.gradle

@@ -1,6 +1,7 @@
 plugins {
     id("com.github.johnrengelman.shadow") version "7.1.2"
     id("io.micronaut.application") version "3.7.3"
+    id("com.magnetichq.client-dependencies") version "2.0.0"
 }
 
 version = "0.1"
@@ -17,7 +18,7 @@ dependencies {
     implementation("jakarta.annotation:jakarta.annotation-api")
     runtimeOnly("ch.qos.logback:logback-classic")
     implementation("io.micronaut:micronaut-validation")
-
+    implementation("io.micronaut.views:micronaut-views-thymeleaf")
 }
 
 
@@ -40,4 +41,10 @@ micronaut {
 }
 
 
-
+clientDependencies {
+    installDir = 'src/main/resources/assets/vendor'
+    npm {
+        'bulma'('0.9.4', into: 'bulma') { include 'css/bulma.*' }
+        'htmx.org'('1.8.5', into: 'htmx') { include 'htmx.js', 'ext/preload.js' }
+    }
+}

src/main/java/hello/HelloController.java

@@ -1,28 +1,71 @@
 package hello;
 
 import io.micronaut.http.MediaType;
+
+import java.util.ArrayDeque;
+import java.util.Deque;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import io.micronaut.core.annotation.Nullable;
+import io.micronaut.core.util.CollectionUtils;
 import io.micronaut.http.HttpResponse;
+import io.micronaut.http.annotation.Consumes;
 import io.micronaut.http.annotation.Controller;
 import io.micronaut.http.annotation.Get;
-import io.micronaut.http.annotation.Produces;
+import io.micronaut.http.annotation.Post;
+import io.micronaut.views.View;
+import jakarta.annotation.PostConstruct;
 
 @Controller("/")
 public class HelloController {
 
-    @Get("/")
-    @Produces(MediaType.TEXT_PLAIN)
-    public HttpResponse<String> index() {
+    private static final Logger log = LoggerFactory.getLogger(HelloController.class);
 
+
+    private static long counter = 0;
+    private static Deque<String> msgDeque = new ArrayDeque<String>();
+    private static String hostname;
+
+
+    @PostConstruct
+    void initialize() {
+        log.info("initialize()");
+        hostname = System.getenv("HOSTNAME");
+
+    }
+
+    @Get("/")
+    @View("index")
+    public HttpResponse<?> index() {
         String osName = System.getProperty("os.name");
         String osVersion = System.getProperty("os.version");
         String osArch = System.getProperty("os.arch");
-
         String javaName = System.getProperty("java.vm.name");
         String javaVersion = System.getProperty("java.vm.version");
+        String helloMessage = String.format("%s v%s, running %s %s on %s.", javaName, javaVersion, osName, osVersion, osArch);
 
-        String helloMessage = String.format("Hello from %s v%s, running %s %s on %s.", javaName, javaVersion, osName, osVersion, osArch);
+        return HttpResponse.ok(CollectionUtils.mapOf("hostname", hostname, "info", helloMessage));
+    }
    
-        return HttpResponse.ok(helloMessage);
+
+    @Post("/ping")
+    @View("pong")
+    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
+    public HttpResponse<?> ping(@Nullable String message) {
+        if(message != null && !message.isEmpty()) {
+            log.info(message);
+            counter++;
+            msgDeque.push(message);
+            //msgDeque.add(message);
+            //messages.add(0, message);
+            if(msgDeque.size() > 25) {
+                log.debug("Message deque: {}", msgDeque.size());
+                msgDeque.removeLast();
+            }
+        }
+        return HttpResponse.ok(CollectionUtils.mapOf("hostname", hostname, "counter", counter, "messages", msgDeque));
     }
 
     

src/main/resources/application.yml

@@ -1,6 +1,18 @@
 micronaut:
   application:
     name: hello
+  router:
+    static-resources:
+      default:
+        enabled: true
+        mapping: /**/*.html
+        paths:
+          - classpath:public
+      assets:
+        enabled: true
+        mapping: /assets/**
+        paths:
+          - classpath:assets
 netty:
   default:
     allocator:

src/main/resources/assets/vendor/htmx/ext/preload.js

@@ -0,0 +1,144 @@
+// This adds the "preload" extension to htmx.  By default, this will 
+// preload the targets of any tags with `href` or `hx-get` attributes 
+// if they also have a `preload` attribute as well.  See documentation
+// for more details
+htmx.defineExtension("preload", {
+
+	onEvent: function(name, event) {
+
+		// Only take actions on "htmx:afterProcessNode"
+		if (name !== "htmx:afterProcessNode") {
+			return;
+		}
+
+		// SOME HELPER FUNCTIONS WE'LL NEED ALONG THE WAY
+
+		// attr gets the closest non-empty value from the attribute.
+		var attr = function(node, property) {
+			if (node == undefined) {return undefined;}
+			return node.getAttribute(property) || node.getAttribute("data-" + property) || attr(node.parentElement, property)
+		}
+		
+		// load handles the actual HTTP fetch, and uses htmx.ajax in cases where we're 
+		// preloading an htmx resource (this sends the same HTTP headers as a regular htmx request)
+		var load = function(node) {
+
+			// Called after a successful AJAX request, to mark the
+			// content as loaded (and prevent additional AJAX calls.)
+			var done = function(html) {
+				if (!node.preloadAlways) {
+					node.preloadState = "DONE"
+				}
+
+				if (attr(node, "preload-images") == "true") {
+					document.createElement("div").innerHTML = html // create and populate a node to load linked resources, too.
+				}
+			}
+
+			return function() {
+
+				// If this value has already been loaded, then do not try again.
+				if (node.preloadState !== "READY") {
+					return;
+				}
+
+				// Special handling for HX-GET - use built-in htmx.ajax function
+				// so that headers match other htmx requests, then set 
+				// node.preloadState = TRUE so that requests are not duplicated
+				// in the future
+				var hxGet = node.getAttribute("hx-get") || node.getAttribute("data-hx-get")
+				if (hxGet) {
+					htmx.ajax("GET", hxGet, {handler:function(elt, info) {
+						done(info.xhr.responseText);
+					}});
+					return;
+				}
+
+				// Otherwise, perform a standard xhr request, then set 
+				// node.preloadState = TRUE so that requests are not duplicated 
+				// in the future.
+				if (node.getAttribute("href")) {
+					var r = new XMLHttpRequest();
+					r.open("GET", node.getAttribute("href"));
+					r.onload = function() {done(r.responseText);};
+					r.send();
+					return;
+				}
+			}
+		}
+
+		// This function processes a specific node and sets up event handlers.
+		// We'll search for nodes and use it below.
+		var init = function(node) {
+
+			// If this node DOES NOT include a "GET" transaction, then there's nothing to do here.
+			if (node.getAttribute("href") + node.getAttribute("hx-get") + node.getAttribute("data-hx-get") == "") {
+				return;
+			}
+
+			// Guarantee that we only initialize each node once.
+			if (node.preloadState !== undefined) {
+				return;
+			}
+			
+			// Get event name from config.
+			var on = attr(node, "preload") || "mousedown"
+			const always = on.indexOf("always") !== -1
+			if (always) {
+				on = on.replace('always', '').trim()
+			}
+						
+			// FALL THROUGH to here means we need to add an EventListener
+	
+			// Apply the listener to the node
+			node.addEventListener(on, function(evt) {
+				if (node.preloadState === "PAUSE") { // Only add one event listener
+					node.preloadState = "READY"; // Requred for the `load` function to trigger
+
+					// Special handling for "mouseover" events.  Wait 100ms before triggering load.
+					if (on === "mouseover") {
+						window.setTimeout(load(node), 100);
+					} else {
+						load(node)() // all other events trigger immediately.
+					}
+				}
+			})
+
+			// Special handling for certain built-in event handlers
+			switch (on) {
+
+				case "mouseover":
+					// Mirror `touchstart` events (fires immediately)
+					node.addEventListener("touchstart", load(node));
+
+					// WHhen the mouse leaves, immediately disable the preload
+					node.addEventListener("mouseout", function(evt) {
+						if ((evt.target === node) && (node.preloadState === "READY")) {
+							node.preloadState = "PAUSE";
+						}
+					})
+					break;
+
+				case "mousedown":
+					 // Mirror `touchstart` events (fires immediately)
+					node.addEventListener("touchstart", load(node));
+					break;
+			}
+
+			// Mark the node as ready to run.
+			node.preloadState = "PAUSE";
+			node.preloadAlways = always;
+			htmx.trigger(node, "preload:init") // This event can be used to load content immediately.
+		}
+
+		// Search for all child nodes that have a "preload" attribute
+		event.target.querySelectorAll("[preload]").forEach(function(node) {
+
+			// Initialize the node with the "preload" attribute
+			init(node)
+
+			// Initialize all child elements that are anchors or have `hx-get` (use with care)
+			node.querySelectorAll("a,[hx-get],[data-hx-get]").forEach(init)
+		})
+	}
+})

src/main/resources/views/defaultLayout.html

@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html th:fragment="layout (title, content)" xmlns:th="http://www.thymeleaf.org">
+
+<head>
+    <meta charset="utf-8">
+    <meta content="width=device-width, initial-scale=1" name="viewport">
+    <meta content="true" name="intercoolerjs:use-actual-http-method" />
+    <title th:replace="${title}">Hello Micronaut</title>
+    <link rel="icon" type="image/x-icon" href="/assets/images/favicon.ico">
+    <link href="/assets/vendor/bulma/css/bulma.min.css" rel="stylesheet">
+</head>
+
+<body>
+
+
+    <!-- Navigation -->
+    <nav class="navbar is-light" role="navigation" aria-label="Navigation" id="header-nav">
+        <div class="navbar-brand">
+            <a href="/" class="navbar-item">
+                <!-- <img src="./images/bulma-logo.png" alt=""> -->
+                <!--<img src="/assets/images/app-logo.svg" alt="" width="32" height="32" />-->
+            </a>
+        </div>
+        <div class="navbar-menu">
+            <div class="navbar-start">
+                <p class="navbar-item">Hello Micronaut</p>
+            </div>
+            <div class="navbar-end">
+                <p class="navbar-item">
+                    <a href="https://git.data.coop/nellemann/hellomicronaut" target="_blank">git.data.coop/nellemann/hellomicronaut</a>
+                </p>
+            </div>
+        </div>
+    </nav>
+    <!-- ./Navigation -->
+
+    <div th:replace="${content}">
+        <p>Layout content</p>
+    </div>
+
+    <script src="/assets/vendor/htmx/htmx.js" type="text/javascript"></script>
+
+</body>
+
+</html>

src/main/resources/views/index.html

@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html lang="en" th:replace="~{defaultLayout :: layout(~{::title}, ~{::section})}" xmlns:th="http://www.thymeleaf.org">
+
+<head>
+    <title>Hello Micronaut</title>
+</head>
+
+<body>
+
+    <section class="section">
+        <div class="container">
+
+            <article class="message">
+                <div class="message-header">
+                    <p>Hello Micronaut from <span th:text="${hostname}"></span></span></p>
+                    <button class="delete" aria-label="delete"></button>
+                </div>
+                <div class="message-body" th:text="${info}">                    
+                </div>
+            </article>
+
+            <div class="columns">
+                <div class="column">
+                    
+                    <form hx-post="/ping">
+                        <div class="field has-addons"  hx-target="#pong">
+                            <div class="control">
+                                <input name="message" class="input" type="text" placeholder="Enter message">
+                            </div>
+                            <div class="control">
+                                <a class="button is-info" hx-post="/ping" hx-include="[msg='message']">
+                                    Submit
+                                </a>
+                            </div>
+                        </div>
+                    </form>
+                    
+                </div>
+            </div>
+
+            <div class="columns mt-4">
+                <div class="collumn" id="pong" hx-post="/ping" hx-trigger="load, queue:last, every 5s">
+                </div>
+            </div>
+
+        </div>
+
+    </section>
+
+</body>
+
+</html>

src/main/resources/views/pong.html

@@ -0,0 +1,15 @@
+<span class="tag is-warning is-medium" th:text="${hostname}">
+    Host
+</span>
+
+<span class="tag is-danger is-medium" th:text="${counter}">
+    Count
+</span>
+
+<div th:each="message: ${messages}">
+    <article class="message mt-3">
+        <div class="message-body">
+            <span th:text="${message}">text</span>
+        </div>
+    </article>
+</div>