Introduce Spring Session MongoDB

* Migrate the module's code back into this project.
* Fold the documentation in.
* Update to current Gradle conventions.
* Reformat to match styling.

spring-session-samples/spring-session-sample-boot-mongodb-reactive/src/main/java/org/springframework/session/mongodb/examples/SessionAttributeForm.java

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+/*
+ * Copyright 2014-2017 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 org.springframework.session.mongodb.examples;
+
+import java.util.Objects;
+
+/**
+ * @author Rob Winch
+ * @author Greg Turnquist
+ * @since 5.0
+ */
+public class SessionAttributeForm {
+
+	private String attributeName;
+
+	private String attributeValue;
+
+	public String getAttributeName() {
+		return this.attributeName;
+	}
+
+	public void setAttributeName(String attributeName) {
+		this.attributeName = attributeName;
+	}
+
+	public String getAttributeValue() {
+		return this.attributeValue;
+	}
+
+	public void setAttributeValue(String attributeValue) {
+		this.attributeValue = attributeValue;
+	}
+
+	@Override
+	public boolean equals(Object o) {
+
+		if (this == o) {
+			return true;
+		}
+		if (!(o instanceof SessionAttributeForm)) {
+			return false;
+		}
+		SessionAttributeForm that = (SessionAttributeForm) o;
+		return Objects.equals(this.attributeName, that.attributeName)
+				&& Objects.equals(this.attributeValue, that.attributeValue);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(this.attributeName, this.attributeValue);
+	}
+
+	@Override
+	public String toString() {
+
+		return "SessionAttributeForm{" + "attributeName='" + this.attributeName + '\'' + ", attributeValue='"
+				+ this.attributeValue + '\'' + '}';
+	}
+
+}

spring-session-samples/spring-session-sample-boot-mongodb-reactive/src/main/java/org/springframework/session/mongodb/examples/SessionController.java

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+/*
+ * Copyright 2014-2016 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 org.springframework.session.mongodb.examples;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.server.WebSession;
+
+/**
+ * @author Rob Winch
+ * @author Greg Turnquist
+ */
+// tag::class[]
+@Controller
+public class SessionController {
+
+	@PostMapping("/session")
+	public String setAttribute(@ModelAttribute SessionAttributeForm sessionAttributeForm, WebSession session) {
+
+		session.getAttributes().put(sessionAttributeForm.getAttributeName(), sessionAttributeForm.getAttributeValue());
+		return "redirect:/";
+	}
+
+	@GetMapping("/")
+	public String index(Model model, WebSession webSession) {
+
+		model.addAttribute("webSession", webSession);
+		return "index";
+	}
+
+}
+// tag::end[]

spring-session-samples/spring-session-sample-boot-mongodb-reactive/src/main/java/org/springframework/session/mongodb/examples/SpringSessionMongoReactiveApplication.java

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+/*
+ * Copyright 2017 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 org.springframework.session.mongodb.examples;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.session.data.mongo.config.annotation.web.reactive.EnableMongoWebSession;
+
+/**
+ * Pure Spring-based application (using Spring Boot for dependency management), hence no
+ * autoconfiguration.
+ *
+ * @author Rob Winch
+ * @author Greg Turnquist
+ */
+@SpringBootApplication
+@EnableMongoWebSession
+public class SpringSessionMongoReactiveApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SpringSessionMongoReactiveApplication.class);
+	}
+
+}

spring-session-samples/spring-session-sample-boot-mongodb-reactive/src/main/resources/application.yml

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+logging:
+  level:
+    org.springframework.data.mongodb: DEBUG
+    org.springframework.session: DEBUG

spring-session-samples/spring-session-sample-boot-mongodb-reactive/src/main/resources/templates/index.html

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+<!DOCTYPE html>
+<html xmlns:th="https://www.thymeleaf.org">
+<head>
+    <title>Session Attributes</title>
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
+</head>
+<body>
+<div class="container">
+    <h1>Description</h1>
+    <p>This application demonstrates how to use a MongoDB instance to back your session. Notice that there is no
+        JSESSIONID cookie. We are also able to customize the way of identifying what the requested session id is.</p>
+
+    <h1>Try it</h1>
+
+    <form class="form-inline" role="form" action="./session" method="post">
+        <label for="attributeName">Attribute Name</label>
+        <input id="attributeName" type="text" name="attributeName"/>
+        <label for="attributeValue">Attribute Value</label>
+        <input id="attributeValue" type="text" name="attributeValue"/>
+        <input type="submit" value="Set Attribute"/>
+    </form>
+
+    <hr/>
+
+    <table class="table table-striped">
+        <thead>
+        <tr>
+            <th>Attribute Name</th>
+            <th>Attribute Value</th>
+        </tr>
+        </thead>
+        <tbody>
+        <tr th:each="attr : ${webSession.attributes}">
+            <td th:text="${attr.key}"/>
+            <td th:text="${attr.value}"/>
+        </tr>
+        </tbody>
+    </table>
+</div>
+</body>
+</html>