08239nam a22002417a 4500 2420 2420 OSt 20200116102816.0 200116b ||||| |||| 00| 0 eng d 978-93-5023-427-7 Allied Informatics, Jaipur 7084 13/01/2020 2019-20 BSDU English BSDU 005.276 CHU Chu-Carroll, Mark C. Code in the Cloud: Programming google app engine Mumbai Shroff Publishers & Distributors Pvt. Ltd. 2018 306 Join the next wave of Web 2.0 software development in the cloud! Cloud applications are the next big shift in application development: instead of building single-user applications to run on a personal computer, new applications are being built as multi-user services that run in data centers around the world. Code in the Cloud: Programming Google AppEngine will teach you what you need to make the shift to cloud development using Google’s AppEngine—a powerful, easy-to-use framework for developing cloud-based services. The cloud is a platform for creating services, a new kind of application that can reach more users and provide those users with more capabilities than a desktop application ever could. Building applications as cloud services makes them scalable: cloud applications can easily and smoothly adapt from running on a single computer for a single user to running on thousands of computers for millions of users. Code in the Cloud will teach you what a cloud service is, and how it differs from traditional applications. It shows you how to build a cloud service by taking advantage of the services that AppEngine makes available to you, and by using iterative development of a simple application to guide you through the different aspects of AppEngine development, using either Python or Java. Through the process of working on a simple application, you’ll learn about how to build an application as a service; how to manage persistent data using AppEngine; how to build dynamic, interactive user interfaces that run in a user’s web-browser; how to manage security in a web application; and how to interact with other services running in the AppEngine cloud. Contents I Getting Started with Google App Engine 1 1 Introduction 3 1.1 What’s Cloud Computing? . . . . . . . . . . . . . . . 3 1.2 Cloud Computing Programming Systems . . . . . . 9 1.3 Acknowledgments . . . . . . . . . . . . . . . . . . . . 12 2 Getting Started 13 2.1 Setting Up a Google App Engine Account . . . . . . 13 2.2 Setting Up Your Development Environment . . . . . 15 2.3 Starting to Program in Python with App Engine . . 18 2.4 Monitoring Your Application . . . . . . . . . . . . . . 25 II Programming Google App Engine with Python 29 3 A First Real Cloud Application 31 3.1 The Basic Chat Application . . . . . . . . . . . . . . 31 3.2 The Basics of HTTP . . . . . . . . . . . . . . . . . . . 35 3.3 Mapping Chat into HTTP . . . . . . . . . . . . . . . . 39 4 Managing Data in the Cloud 47 4.1 Why Didn’t Chat Work? . . . . . . . . . . . . . . . . . 47 4.2 Making Chat Persistent . . . . . . . . . . . . . . . . . 50 5 Google App Engine Services for Login Authentication 59 5.1 Introducing the Users Service . . . . . . . . . . . . . 59 5.2 The Users Service . . . . . . . . . . . . . . . . . . . . 60 5.3 Integrating the Users Service into Chat . . . . . . . 61 6 Organizing Code: Separating UI and Logic 65 6.1 Getting Started with Templates . . . . . . . . . . . . 65 6.2 Building Related Views with Templates . . . . . . . 70 6.3 Multiple Chat Rooms . . . . . . . . . . . . . . . . . . 76 7 Making the UI Pretty: Templates and CSS 83 7.1 Introducing CSS . . . . . . . . . . . . . . . . . . . . . 84 7.2 Styling Text Using CSS . . . . . . . . . . . . . . . . . 85 7.3 Page Layouts Using CSS . . . . . . . . . . . . . . . . 90 7.4 Building Our Interface Using Flowed Layout . . . . 98 7.5 Including CSS Files in App Engine Applications . . 101 8 Getting Interactive 103 8.1 Interactive Web Services: The Basics . . . . . . . . . 103 8.2 The Model-View-Controller Design Pattern . . . . . 106 8.3 Talking to the Server without Disruption . . . . . . 109 8.4 References and Resources . . . . . . . . . . . . . . . 117 III Programming Google App Engine with Java 119 9 Google App Engine and Java 121 9.1 Introducing GWT . . . . . . . . . . . . . . . . . . . . 123 9.2 Getting Started with Java and GWT . . . . . . . . . 125 9.3 RPC in GWT . . . . . . . . . . . . . . . . . . . . . . . 133 9.4 Testing and Deploying with GWT . . . . . . . . . . . 138 10 Managing Server-Side Data 139 10.1 Data Persistence in Java . . . . . . . . . . . . . . . . 139 10.2 Storing Persistent Objects in GWT . . . . . . . . . . 143 10.3 Retrieving Persistent Objects in GWT . . . . . . . . . 147 10.4 Gluing the Client and the Server Together . . . . . . 149 10.5 References and Resources . . . . . . . . . . . . . . . 151 11 Building User Interfaces in Java 153 11.1 Why Use GWT? . . . . . . . . . . . . . . . . . . . . . 153 11.2 Building GWT UIs with Widgets . . . . . . . . . . . . 154 11.3 Making the UI Active: Handling Events . . . . . . . 161 11.4 Making the UI Active: Updating the Display . . . . . 166 11.5 Wrapping Up with GWT . . . . . . . . . . . . . . . . 168 11.6 References and Resources . . . . . . . . . . . . . . . 169 12 Building the Server Side of a Java Application 171 12.1 Filling in Gaps: Supporting Chat Rooms . . . . . . . 171 12.2 Proper Interactive Design: Being Incremental . . . . 176 12.3 Updating the Client . . . . . . . . . . . . . . . . . . . 184 12.4 Chat Administration . . . . . . . . . . . . . . . . . . 185 12.5 Running and Deploying the Chat Application . . . . 187 12.6 Wrapping Up the Server Side . . . . . . . . . . . . . 189 IV Advanced Google App Engine 191 13 Advanced Datastore: Property Types 193 13.1 Building a Filesystem Service . . . . . . . . . . . . . 193 13.2 Modeling the Filesystem: A First Cut . . . . . . . . . 197 13.3 Property Types Reference . . . . . . . . . . . . . . . . 214 13.4 Wrapping Up Property Types . . . . . . . . . . . . . 217 14 Advanced Datastore: Queries and Indices 219 14.1 Indices and Queries in Datastore . . . . . . . . . . . 220 14.2 More Flexible Models . . . . . . . . . . . . . . . . . . 226 14.3 Transactions, Keys, and Entity Groups . . . . . . . 227 14.4 Policy and Consistency Models . . . . . . . . . . . . 229 14.5 Incremental Retrieval . . . . . . . . . . . . . . . . . . 233 15 Google App Engine Services 235 15.1 The Memcache Service . . . . . . . . . . . . . . . . . 236 15.2 Accessing Other Stuff: The URL Fetch Service . . . 241 15.3 Communicating with People: Mail and Chat Services 242 15.4 Sending and Receiving Email . . . . . . . . . . . . . 246 15.5 Wrapping Up Services . . . . . . . . . . . . . . . . . 249 16 Server Computing in the Cloud 251 16.1 Scheduling Jobs with App Engine Cron . . . . . . . 252 16.2 Running Jobs Dynamically Using the Task Queue . 256 16.3 Wrapping Up Server Computing . . . . . . . . . . . . 262 17 Security in App Engine Services 263 17.1 What Is Security? . . . . . . . . . . . . . . . . . . . . 263 17.2 Basic Security . . . . . . . . . . . . . . . . . . . . . . 264 17.3 Advanced Security . . . . . . . . . . . . . . . . . . . 272 18 Administering Your App Engine Deployment 281 18.1 Monitoring . . . . . . . . . . . . . . . . . . . . . . . . 281 18.2 Peeking at the Datastore . . . . . . . . . . . . . . . . 285 18.3 Logs and Debugging . . . . . . . . . . . . . . . . . . 286 18.4 Managing Your Application . . . . . . . . . . . . . . 288 18.5 Paying for What You Use . . . . . . . . . . . . . . . . 289 19 Wrapping Up 291 19.1 Cloud Concepts . . . . . . . . . . . . . . . . . . . . . 291 19.2 Google App Engine Concepts . . . . . . . . . . . . . 292 19.3 Where to Go from Here . . . . . . . . . . . . . . . . . 294 19.4 References and Resources . . . . . . . . . . . . . . . 296 Index 297 CSE Cloud computing Toporek, Colleen (Editor) ddc BK 0 0 ddc 0 0 BSDU BSDU GEN 2020-01-16 625.00 1 005.276 CHU 017977 2022-12-23 00:00:00 2022-12-20 625.00 2020-01-16 BK