Add Sample Code for HTTP Session Caching.

spring-geode-samples/caching/http-session/spring-geode-samples-caching-httpsession.gradle

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+apply plugin: 'io.spring.convention.spring-sample-boot'
+
+description = "Spring Geode Sample demonstrating Spring Session with Apache Geode for HTTP Session Caching."
+
+dependencies {
+
+	compile project(":spring-geode-starter")
+
+	compile ("org.springframework.boot:spring-boot-starter-web") {
+		exclude group: "org.apache.logging.log4j", module: "log4j-to-slf4j"
+	}
+
+//	runtime project(":spring-geode-starter-session")
+
+	runtime("org.springframework.boot:spring-boot-starter-thymeleaf") {
+		exclude group: "org.apache.logging.log4j", module: "log4j-to-slf4j"
+	}
+
+	runtime ("org.springframework.boot:spring-boot-starter-tomcat") {
+		exclude group: "org.apache.logging.log4j", module: "log4j-to-slf4j"
+	}
+
+	testCompile("org.springframework.boot:spring-boot-starter-test") {
+		exclude group: "org.apache.logging.log4j", module: "log4j-to-slf4j"
+	}
+
+	testCompile "org.springframework.data:spring-data-geode-test"
+
+}
+
+bootJar {
+	mainClassName = 'example.app.caching.lookaside.BootGeodeHttpSessionCachingApplication'
+}

spring-geode-samples/caching/http-session/src/main/java/example/app/caching/session/http/BootGeodeHttpSessionCachingApplication.java

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+/*
+ * Copyright 2019 the original author or authors.
+ *
+ * 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
+ *
+ *     https://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 example.app.caching.session.http;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * {@link SpringBootApplication} to demo HTTP Session state caching.
+ *
+ * @author John Blum
+ * @see org.springframework.boot.SpringApplication
+ * @see org.springframework.boot.autoconfigure.SpringBootApplication
+ * @since 1.1.0
+ */
+@SpringBootApplication
+public class BootGeodeHttpSessionCachingApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(BootGeodeHttpSessionCachingApplication.class, args);
+	}
+}

spring-geode-samples/caching/http-session/src/main/java/example/app/caching/session/http/controller/CounterController.java

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+/*
+ * Copyright 2019 the original author or authors.
+ *
+ * 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
+ *
+ *     https://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 example.app.caching.session.http.controller;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+
+import javax.servlet.http.HttpSession;
+
+import org.apache.geode.internal.concurrent.ConcurrentHashSet;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.servlet.ModelAndView;
+
+/**
+ * Spring Web MVC {@link Controller} used to count the number of HTTP requests per HTTP Session
+ * and the number of HTTP Sessions.
+ *
+ * @author John Blum
+ * @see javax.servlet.http.HttpSession
+ * @see org.springframework.stereotype.Controller
+ * @see org.springframework.web.bind.annotation.GetMapping
+ * @see org.springframework.web.bind.annotation.ResponseBody
+ * @see org.springframework.web.servlet.ModelAndView
+ * @since 1.1.0
+ */
+//tag::class[]
+@Controller
+public class CounterController {
+
+	public static final String INDEX_TEMPLATE_VIEW_NAME = "index";
+
+	private final Set<String> sessionIds = new ConcurrentHashSet<>();
+
+	@GetMapping("/")
+	@ResponseBody
+	public String home() {
+		return format("HTTP Session Caching Example");
+	}
+
+	@GetMapping("/ping")
+	@ResponseBody
+	public String ping() {
+		return format("PONG");
+	}
+
+	@GetMapping("/session")
+	public ModelAndView sessionRequestCounts(HttpSession session) {
+
+		this.sessionIds.add(session.getId());
+
+		Map<String, Object> model = new HashMap<>();
+
+		model.put("sessionType", session.getClass().getName());
+		model.put("sessionCount", this.sessionIds.size());
+		model.put("requestCount", getRequestCount(session));
+
+		return new ModelAndView(INDEX_TEMPLATE_VIEW_NAME, model);
+	}
+
+	private Object getRequestCount(HttpSession session) {
+
+		Integer requestCount = (Integer) session.getAttribute("requestCount");
+
+		requestCount = requestCount != null ? requestCount : 0;
+		requestCount++;
+
+		session.setAttribute("requestCount", requestCount);
+
+		return requestCount;
+	}
+
+	private String format(String value) {
+		return String.format("<h1>%s</h1>", value);
+	}
+}
+//end::class[]

spring-geode-samples/caching/http-session/src/main/resources/application.properties

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+# Spring Boot application.properties for the HTTP Session State Caching Example application.
+
+spring.application.name=HttpSessionCachingApplication
+spring.data.gemfire.cache.log-level=error
+spring.session.data.gemfire.cache.client.pool.name=DEFAULT
+spring.session.data.gemfire.cache.client.region.shortcut=LOCAL
+spring.session.data.gemfire.session.region.name=Sessions
+server.servlet.session.timeout=15

spring-geode-samples/caching/http-session/src/main/resources/templates/index.html

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+<!DOCTYPE html SYSTEM "https://www.thymeleaf.org/dtd/xhtml1-strict-thymeleaf-spring4-3.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="https://www.thymeleaf.org">
+<head>
+    <title>HTTP Session Details</title>
+    <link rel="stylesheet" th:href="@{/webjars/bootstrap/css/bootstrap.min.css}" href="/webjars/bootstrap/css/bootstrap.min.css"/>
+    <style type="text/css">
+		body {
+			padding: 1em;
+		}
+	</style>
+</head>
+<body>
+    <div class="container">
+        <table class="table table-striped" border="1">
+            <thead align="left">
+            <tr>
+                <th>HttpSession Type</th>
+                <th>HttpSession Count</th>
+                <th>HttpServletRequest Count</th>
+            </tr>
+            </thead>
+            <tbody>
+            <tr>
+                <td th:text="${sessionType}">value</td>
+                <td th:text="${sessionCount}">value</td>
+                <td th:text="${requestCount}">value</td>
+            </tr>
+            </tbody>
+        </table>
+    </div>
+</body>