Google App Engine overview (GAE/J)
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This document provides an overview of Google App Engine (GAE), a platform as a service that allows users to run web applications on Google's infrastructure. It discusses key aspects of GAE like language support, automatic scaling, quotas and limits. The document then demonstrates how to set up a basic "Hello World" application on GAE for Java (GAE/J) using Eclipse as the IDE. It shows the project structure, deploying the application to GAE, and potential next steps like using Guice or the Python runtime.
![/WEB-INF/jsp/guestbook.jsp
Iterate Greeting List
<c:forEach items="${greetingList}" var="greeting">
Passed from Servlet
<c:if test="${not empty greeting.properties['user']}">
<p><b>${fn:escapeXml(greeting.properties['user'].nickname)}</b> wrote:</p>
</c:if>
<c:if test="${empty greeting.properties['user']}">
<p>An anonymous person wrote:</p>
</c:if>
<blockquote>${fn:escapeXml(greeting.properties['content'])}</blockquote>
</c:forEach>
Form same as
previous
<form action="/sign" method="post">
<div><textarea name="content" rows="3" cols="60"></textarea></div>
<div><input type="submit" value="Post Greeting" /></div>
<input type="hidden" name="guestbookName"
value="${fn:escapeXml(guestbookName)}"/>
</form>
</body>
</html>](https://image.slidesharecdn.com/gaeoverview-140204194948-phpapp01/85/Google-App-Engine-overview-GAE-J-30-320.jpg)
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Google App Engine overview (GAE/J)
- 1. GAE Overview Moch Nasrullah R Samsung R&D Institute Indonesia (SRIN) November 2013
- 3. Agenda • • • • Cloud Computing GAE Overview GAE/J Overview GAE/J Getting Started
- 4. Cloud Computing Cloud Services Cloud Clients (Web browser, Desktop App, Mobile App, embeded, ...)
- 5. http://upload.wikimedia.org/wikipedia/commons/b/b5/Cloud_computing.svg
- 6. Cloud classification Software as a Service (SaaS) Application: -Web Apps -Desktop Apps -Mobile Apps (Google Apps, Google Translate, Office 360, NetSuite, IBM Lotus Live, GitHub) Platform as a Service (PaaS) Development Platform + Runtime Tools + Environment (Google App Engine, Heroku, Windows Azure, force.com, Rollbase) Infrastructure as a Service (IaaS) CPU Networks Data Storage (AWS, VM Ware, Joyent, Rackspace)
- 7. Google App Engine • run your web applications on Google's infrastructure – Google handles the maintenance infrasturcture: hardware failures, security patches, OS upgrades • Free ... within quota
- 8. GAE Limits & Quota • • • • 10 Apps per user 5 Mio pageview free per month 6.5 hours of CPU and 1 Gb in & out traffic https://developers.google.com/appengine/do cs/quotas
- 9. Why GAE • Easy to build – Language support (Java, Python, GO, PHP) – Automatic scaling & load balancing • Easy to maintain – Web based admin dashboard • Easy to scale (traffic & data storage) – GAE Datastore – Google Cloud SQL – Google Cloud Storage
- 11. Let’s give it a try • Follow the getting started in link below: • https://developers.google.com/appengine/docs/java/gettingstarted/introduction
- 12. Run Eclipse after Installing JDK
- 14. Install from zip
- 15. Creating Project
- 16. Configure SDK Directory where Appengine extracted
- 17. The Servlet Class package guestbook; import java.io.IOException; import javax.servlet.http.*; public class GuestbookServlet extends HttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException { resp.setContentType("text/plain"); resp.getWriter().println("Hello, world"); } }
- 18. Project Structure Java source code other configuration JARs for libraries app configuration JSPs, images, data files
- 20. Preparation for deployment • Register to Google App Engine • Create an Application • Deploy via Eclipse
- 21. Register to App Engine • Register at: https://appengine.google.com/ • Create an Application
- 22. Create an Application • For now, just fill in ‘Application Identifier’ and ‘Application Title’, than accept ‘Term of Service’
- 23. Problem when Deploying • Adding VM config o Open eclipse.ini in the eclipse folder o Add below lines before -vmargs -vm C:Javajdk1.7.0_40binjavaw.exe
- 24. Adding VM config • • • • Open eclipse.ini in the eclipse folder Add below lines before -vmargs -vm C:Javajdk1.7.0_40binjavaw.exe
- 25. Sign in to Deploy
- 26. Setting App ID & Version Input Application Identifier registered at appspot.com
- 27. Refactor Example to MVC • Using JSP as View template – JSP files will resides inside ‘WEB-INF/jsp’ folder – So users can not access our template directly • Using Servlet as Controller – Put model in request attribute – Forward to proper View – Change SignGuestbookServlet.java so it redirect to servlet (not JSP): resp.sendRedirect("/guestbook?guestbookName=" + guestbookName);
- 28. GuestbookServlet.java – doGet() UserService userService = UserServiceFactory.getUserService(); User user = userService.getCurrentUser(); String signUrl = ""; String userNickname = ""; if (user!=null) { signUrl = userService.createLogoutURL(req.getRequestURI()); userNickname = user.getNickname(); } else { signUrl = userService.createLoginURL(req.getRequestURI()); } Login or Logout URL String guestbookName = req.getParameter("guestbookName"); if (guestbookName == null) { guestbookName = "default"; } Retrieve data from DatastoreService datastore = DatastoreServiceFactory.getDatastoreService(); datastore Key guestbookKey = KeyFactory.createKey("Guestbook", guestbookName); Query query = new Query("Greeting", guestbookKey).addSort("date", Query.SortDirection.DESCENDING); List<Entity> greetings = datastore.prepare(query).asList(FetchOptions.Builder.withLimit(5)); // put data tobe displayed in JSP req.setAttribute("signUrl", signUrl); req.setAttribute("userNickname", userNickname); req.setAttribute("guestbookName", guestbookName); req.setAttribute("greetingList", greetings); Put data in Request Attribute String templateFile = "/WEB-INF/jsp/guestbook.jsp"; RequestDispatcher rd = getServletContext().getRequestDispatcher(templateFile); rd.forward(req, resp); Forward to View
- 29. /WEB-INF/jsp/guestbook.jsp <%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> Taglib <html> <head> <link type="text/css" rel="stylesheet" href="/stylesheets/main.css" /> </head> <body> <c:if test="${userNickname!=''}"> <p>Hello, ${fn:escapeXml(userNickname)}! (You can <a href="${signUrl}">sign out</a>.)</p> Say proper hello to </c:if> sign in user <c:if test="${userNickname==''}"> <p>Hello! <a href="${signUrl}">Sign in</a> to include your name with greetings you post.</p> </c:if> <c:if test="${empty greetingList}"> <p>Guestbook '${fn:escapeXml(guestbookName)}' has no messages.</p> </c:if> <c:if test="${not empty greetingList}"> <p>Messages in Guestbook '${fn:escapeXml(guestbookName)}'.</p> </c:if>
- 30. /WEB-INF/jsp/guestbook.jsp Iterate Greeting List <c:forEach items="${greetingList}" var="greeting"> Passed from Servlet <c:if test="${not empty greeting.properties['user']}"> <p><b>${fn:escapeXml(greeting.properties['user'].nickname)}</b> wrote:</p> </c:if> <c:if test="${empty greeting.properties['user']}"> <p>An anonymous person wrote:</p> </c:if> <blockquote>${fn:escapeXml(greeting.properties['content'])}</blockquote> </c:forEach> Form same as previous <form action="/sign" method="post"> <div><textarea name="content" rows="3" cols="60"></textarea></div> <div><input type="submit" value="Post Greeting" /></div> <input type="hidden" name="guestbookName" value="${fn:escapeXml(guestbookName)}"/> </form> </body> </html>
- 31. Maybe Next Time • Using Guice in GAE/J • Using GAE Python
- 32. Reference • http://www.slideshare.net/dimityrdanailov/google-app-enginevarna-lab-19062013 • http://www.slideshare.net/LarsVogel/google-app-engine-for-java7698966 • http://www.google.com/events/io/2009/sessions.html#appengine • http://www.google.com/events/io/2010/sessions.html#App%20Eng ine • http://www.google.com/events/io/2011/sessions.html#appengine-track • https://developers.google.com/events/io/2012/sessions#cloudplatform • https://developers.google.com/events/io/2013/sessions#t-googlecloud-platform • https://developers.google.com/appengine/