Server draft to deploy on Google Engine

Author: Burbaka

build.gradle

@@ -6,24 +6,51 @@ buildscript {
 
   dependencies {
     classpath 'com.stanfy.helium:gradle-plugin:0.8.0-SNAPSHOT'
+    classpath 'com.google.appengine:gradle-appengine-plugin:1.9.30'
   }
 }
 
-apply plugin: 'java'
 apply plugin: 'helium'
-
-sourceCompatibility = JavaVersion.VERSION_1_8
-targetCompatibility = JavaVersion.VERSION_1_8
+apply plugin: 'war'
+apply plugin: 'appengine'
 
 repositories {
   mavenCentral()
 }
 
 dependencies {
+  appengineSdk 'com.google.appengine:appengine-java-sdk:1.9.32'
   compile 'com.squareup.retrofit:retrofit:1.9.0'
+  compile 'com.google.code.gson:gson:1.7.2'
+  compile 'javax.servlet:javax.servlet-api:3.0.1'
 }
 
+sourceCompatibility = JavaVersion.VERSION_1_7
+targetCompatibility = JavaVersion.VERSION_1_7
+
+appengine {
+
+  downloadSdk = true
+
+  appcfg {
+    oauth2 = true
+  }
+
+  app {
+    id = 'helium-1222'
+  }
+
+  update {
+    useJava7 = true
+  }
+
+  logs {
+    severity = 0
+    outputFile = file('debugLogs.txt')
+  }
+}
 
+////// Hellium api and code generation scope. //////
 import com.stanfy.helium.handler.codegen.java.constants.ConstantNameConverter
 
 import javax.lang.model.element.Modifier

src/main/java/com/stanfy/helium/server/Data.java

@@ -0,0 +1,45 @@
+package com.stanfy.helium.server;
+
+import com.google.gson.annotations.SerializedName;
+
+public class Data {
+
+  @SerializedName("boolean_truth")
+  private boolean boolData;
+
+  @SerializedName("string_data")
+  private String text;
+
+  @SerializedName("numeric_data")
+  private Integer numericValue;
+
+  public boolean getBoolValue() {
+    return boolData;
+  }
+
+  public String getText() {
+    return text;
+  }
+
+  public void setNumericValue(Integer newValue) {
+    numericValue = newValue;
+  }
+
+  public Integer getNumericValue() {
+    return numericValue;
+  }
+
+  public void setBoolData(boolean boolData) {
+    this.boolData = boolData;
+  }
+
+  public void setText(String text) {
+    this.text = text;
+  }
+
+  @Override
+  public String toString() {
+    return "string = " + text + ", bool = " + boolData + ", number = " + numericValue.toString();
+
+  }
+}

src/main/java/com/stanfy/helium/server/DataRetrieveServlet.java

@@ -0,0 +1,81 @@
+package com.stanfy.helium.server;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.HashMap;
+
+public class DataRetrieveServlet extends HttpServlet {
+
+  private static final HashMap<String, Data> STORE = new HashMap<>(500);
+  private static final Gson GSON = new GsonBuilder().serializeNulls().create();
+
+  @Override
+  public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
+
+    String dataId = getDataId(req);
+
+    Data data = STORE.get(dataId);
+    String jsonData = buildResponse(data);
+
+    putClientResponse(resp, jsonData);
+    respondSuccess(resp);
+  }
+
+  @Override
+  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+    Data requestData = GSON.fromJson(req.getReader(), Data.class);
+    String dataId = getDataId(req);
+
+    STORE.put(dataId, requestData);
+    String jsonData = GSON.toJson(requestData);
+
+    putClientResponse(resp, jsonData);
+    respondSuccess(resp);
+  }
+
+  @Override
+  protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+    String dataId = getDataId(req);
+    STORE.remove(dataId);
+
+    respondSuccess(resp);
+  }
+
+  @Override
+  protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+    Data requestData = GSON.fromJson(req.getReader(), Data.class);
+
+    String dataId = getDataId(req);
+
+    STORE.put(dataId, requestData);
+    respondSuccess(resp);
+  }
+
+  private String buildResponse(final Data data) {
+    ResponseData response = new ResponseData();
+    response.setData(data);
+    return GSON.toJson(response);
+  }
+
+  private void putClientResponse(HttpServletResponse resp, String jsonData) throws IOException {
+    PrintWriter respWriter = resp.getWriter();
+    respWriter.print(jsonData);
+    respWriter.flush();
+  }
+
+  private String getDataId(HttpServletRequest req) {
+    return req.getPathInfo().replaceFirst("/", "");
+  }
+
+  private void respondSuccess(HttpServletResponse resp) {
+    resp.setContentType("application/json");
+    resp.setStatus(HttpServletResponse.SC_OK);
+  }
+}

src/main/java/com/stanfy/helium/server/ResponseData.java

@@ -0,0 +1,14 @@
+package com.stanfy.helium.server;
+
+public class ResponseData {
+
+  Data data;
+
+  public Data getData() {
+    return data;
+  }
+
+  public void setData(Data data) {
+    this.data = data;
+  }
+}

src/main/java/com/stanfy/hellium/server/HelloWorld.java

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
+    <application>helium-1222</application>
+    <version>1</version>
+    <threadsafe>true</threadsafe>
+    
+    <system-properties>
+        <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
+    </system-properties>
+</appengine-web-app>

src/main/webapp/WEB-INF/appengine-web.xml

@@ -0,0 +1,13 @@
+# A default java.util.logging configuration.
+# (All App Engine logging is through java.util.logging by default).
+#
+# To use this configuration, copy it into your application's WEB-INF
+# folder and add the following to your appengine-web.xml:
+# 
+# <system-properties>
+#   <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
+# </system-properties>
+#
+
+# Set the default logging level for all loggers to WARNING
+.level = WARNING

src/main/webapp/WEB-INF/logging.properties

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee"
+         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
+         version="2.5">
+  <servlet>
+    <servlet-name>retrieveData</servlet-name>
+    <servlet-class>com.stanfy.helium.server.DataRetrieveServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>retrieveData</servlet-name>
+    <url-pattern>/data/*</url-pattern>
+  </servlet-mapping>
+</web-app>