Initial import of MVM/SparkJava/gcloud-java example

managedvms/sparkjava/README.md

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+gcloud-java example using Managed VMs & SparkJava
+=================================================
+
+This app demonstrates how to use [`gcloud-java`'s Datastore client](https://github.com/GoogleCloudPlatform/gcloud-java/tree/master/gcloud-java-datastore#google-cloud-java-client-for-datastore) from within an [App Engine Managed VM](https://cloud.google.com/appengine/docs/java/managed-vms/) project using [SparkJava](http://sparkjava.com/). The app allows you to create and modify a database of "users", which contains their ID, name, and email information. 
+
+`gcloud-java` is an idiomatic Java client for [Google Cloud Platform](https://cloud.google.com/) services. Read more about the library [here](https://github.com/GoogleCloudPlatform/gcloud-java#google-cloud-java-client).
+
+Setup
+-----
+
+1. Create a Google Developers Console project with the Datastore API enabled. [Follow these instructions](https://cloud.google.com/docs/authentication#preparation) to get your project set up. If you wish to deploy this application, you will also need to [enable billing](https://support.google.com/cloud/?rd=2#topic=6288636).
+
+2. Set up the local development environment by [installing the Google Cloud SDK](https://cloud.google.com/sdk/) and running the following commands in command line: `gcloud auth login` and `gcloud config set project [YOUR PROJECT ID]`.
+
+3. Ensure that you have Maven installed. See installation instructions [here](https://maven.apache.org/install.html).
+
+Running locally
+---------------
+
+Run the application on your local machine by typing the following into your command line from the `sparkjava` directory: `mvn clean package exec:java`. Navigate to `localhost:8080` to view and interact with the application.
+
+Deploying
+---------
+
+If you've enabled billing (step 1 in [Setup](#Setup)), you can deploy the application to the web by running `mvn gcloud:deploy` from your command line (from the `sparkjava` directory).
+
+How does it work?
+-----------------
+
+You'll notice that the source code is split into three folders: `appengine`, `java/com/google/appengine/sparkdemo`, and `resource/public`. The `appengine` folder contains a `Dockerfile` and an `app.yaml`, necessary files to [configure the VM environment](https://cloud.google.com/appengine/docs/managed-vms/config). The `java/com/google/appengine/sparkdemo` folder contains the controller code, which uses the `gcloud-java` library to modify the records in the Google Cloud Datastore. Finally, the `resource/public` folder contains the home webpage, which uses jQuery to send HTTP requests to create, remove, and update records.
+
+Spark runs the [`main` method](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/master/managedvms/sparkjava-demo/src/main/java/com/google/appengine/sparkdemo/Main.java) upon server startup. The `main` method creates the controller, [`UserController`](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/master/managedvms/sparkjava-demo/src/main/java/com/google/appengine/sparkdemo/UserController.java). The URIs used to send HTTP requests in the [home page](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/master/managedvms/sparkjava-demo/src/main/resources/public/index.html) correspond to methods in the `UserController` class. For example, the `index.html` code for `create` makes a `POST` request to the path `/api/users` with a body containing the name and email of a user to add. `UserController` contains the following code to process that request:
+
+```java
+post("/api/users", (req, res) -> userService.createUser(
+    req.queryParams("name"),
+    req.queryParams("email),
+), json());
+```
+This code snippet gets the name and email of the user from the POST request and passes it to `createUser` (in [`UserService.java`](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/master/managedvms/sparkjava-demo/src/main/java/com/google/appengine/sparkdemo/UserService.java)) to create a database record using `gcloud-java`. If you want a more in-depth tutorial on using `gcloud-java` Datastore client, see the [Getting Started](https://github.com/GoogleCloudPlatform/gcloud-java/tree/master/gcloud-java-datastore#getting-started) section in the `gcloud-java-datastore` documentation.
+
+Communication with the Google Cloud Datastore requires authentication and setting a project ID. When running locally, `gcloud-java` automatically detects your credentials and project ID because you logged into the Google Cloud SDK and set your project ID. There are also many other options for authenticating and setting a project ID. To read more, see the [Authentication](https://github.com/GoogleCloudPlatform/gcloud-java#authentication) and [Specifying a Project ID](https://github.com/GoogleCloudPlatform/gcloud-java#specifying-a-project-id) sections of the `gcloud-java` documentation.
+
+You built and ran this application using Maven. To read more about using Maven with Managed VMs, see the [Using Apache Maven documentation](https://cloud.google.com/appengine/docs/java/managed-vms/maven). While this particular project uses Maven, `gcloud-java` can also be accessed using Gradle and SBT.  See how to obtain the dependency in the [Quickstart section](https://github.com/GoogleCloudPlatform/gcloud-java#quickstart) of the `gcloud-java` documentation.
+
+License
+-------
+
+Apache 2.0 - See [LICENSE](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/master/LICENSE) for more information.

managedvms/sparkjava/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.google.appengine.sparkdemo</groupId>
+  <artifactId>sparkdemo</artifactId>
+  <version>1.0</version>
+  <dependencies>
+    <dependency>
+      <groupId>com.sparkjava</groupId>
+      <artifactId>spark-core</artifactId>
+      <version>2.3</version>
+    </dependency>
+    <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-simple</artifactId>
+      <version>1.7.12</version>
+    </dependency>
+    <dependency>
+      <groupId>com.google.code.gson</groupId>
+      <artifactId>gson</artifactId>
+      <version>2.4</version>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.12</version>
+    </dependency>
+    <dependency>
+      <groupId>com.google.gcloud</groupId>
+      <artifactId>gcloud-java</artifactId>
+      <version>0.1.1</version>
+    </dependency>
+  </dependencies>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.5.1</version>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+        </configuration>
+      </plugin>
+      <plugin>
+        <artifactId>maven-assembly-plugin</artifactId>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>single</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+          <descriptorRefs>
+            <descriptorRef>jar-with-dependencies</descriptorRef>
+          </descriptorRefs>
+          <archive>
+            <manifest>
+              <mainClass>com.google.appengine.sparkdemo.Main</mainClass>
+            </manifest>           
+          </archive>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>exec-maven-plugin</artifactId>
+        <version>1.4.0</version>
+        <configuration>
+          <mainClass>com.google.appengine.sparkdemo.Main</mainClass>
+          <arguments>
+            <argument>-jar</argument>
+            <argument>target/sparkdemo-1.0-jar-with-dependencies.jar</argument>
+          </arguments>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>com.google.appengine</groupId>
+        <artifactId>gcloud-maven-plugin</artifactId>
+        <version>2.0.9.88.v20151125</version>
+        <configuration>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>

managedvms/sparkjava/src/main/appengine/Dockerfile

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+FROM gcr.io/google_appengine/openjdk8
+VOLUME /tmp
+ADD sparkdemo-1.0-jar-with-dependencies.jar app.jar
+ENTRYPOINT [ "java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

managedvms/sparkjava/src/main/appengine/app.yaml

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+runtime: custom
+vm: true

managedvms/sparkjava/src/main/java/com/google/appengine/sparkdemo/Main.java

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+/*
+ * Copyright (c) 2015 Google Inc. All Rights Reserved.
+ *
+ * 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 com.google.appengine.sparkdemo;
+
+import static spark.Spark.port;
+
+import com.google.gcloud.datastore.DatastoreOptions;
+
+public class Main {
+
+  public static void main(String[] args) {
+    port(8080);
+    UserController userController =
+        new UserController(new UserService(DatastoreOptions.defaultInstance().service()));
+  }
+}

managedvms/sparkjava/src/main/java/com/google/appengine/sparkdemo/ResponseError.java

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+/*
+ * Copyright (c) 2015 Google Inc. All Rights Reserved.
+ *
+ * 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 com.google.appengine.sparkdemo;
+
+public class ResponseError {
+
+  private String message;
+
+  public ResponseError(String message, String... args) {
+    this.message = String.format(message, (Object) args);
+  }
+
+  public ResponseError(Exception e) {
+    this.message = e.getMessage();
+  }
+}

managedvms/sparkjava/src/main/java/com/google/appengine/sparkdemo/User.java

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+/*
+ * Copyright (c) 2015 Google Inc. All Rights Reserved.
+ *
+ * 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 com.google.appengine.sparkdemo;
+
+import java.util.UUID;
+
+public class User {
+
+  private String id;
+  private String name;
+  private String email;
+
+  public User(String name, String email) {
+    this(UUID.randomUUID().toString(), name, email);
+  }
+
+  public User(String id, String name, String email) {
+    this.id = id;
+    this.email = email;
+    this.name = name;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getEmail() {
+    return email;
+  }
+
+  void setId(String id) {
+    this.id = id;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public void setEmail(String email) {
+    this.email = email;
+  }
+}

managedvms/sparkjava/src/main/java/com/google/appengine/sparkdemo/UserController.java

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+/*
+ * Copyright (c) 2015 Google Inc. All Rights Reserved.
+ *
+ * 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 com.google.appengine.sparkdemo;
+
+import static spark.Spark.after;
+import static spark.Spark.delete;
+import static spark.Spark.exception;
+import static spark.Spark.get;
+import static spark.Spark.post;
+import static spark.Spark.put;
+
+import com.google.gson.Gson;
+
+import spark.ResponseTransformer;
+import spark.Spark;
+
+public class UserController {
+
+  public UserController(final UserService userService) {
+    Spark.staticFileLocation("/public");
+
+    get("/api/users", (req, res) -> userService.getAllUsers(), UserController::toJson);
+
+    post("/api/users",
+        (req, res) -> userService.createUser(req.queryParams("name"), req.queryParams("email")),
+        json());
+
+    put("/api/users/:id", (req, res) -> userService.updateUser(
+            req.params(":id"),
+            req.queryParams("name"),
+            req.queryParams("email")
+        ), json());
+
+    delete("/api/users/:id", (req, res) -> userService.deleteUser(req.params(":id")), json());
+
+    after((req, res) -> {
+          res.type("application/json");
+        });
+
+    exception(IllegalArgumentException.class, (e, req, res) -> {
+          res.status(400);
+          res.body(toJson(new ResponseError(e)));
+        });
+  }
+
+  private static String toJson(Object object) {
+    return new Gson().toJson(object);
+  }
+
+  private static ResponseTransformer json() {
+    return UserController::toJson;
+  }
+}