Programming Google App Engine with Java by Sanderson, Dan -- Read -- Imperial Library of Trantor

Index

Preface

A Brief History of App Engine Using This Book Conventions Used in This Book Safari® Books Online How to Contact Us Acknowledgments

1. Introducing Google App Engine

The Runtime Environment The Static File Servers Frontend Caches Cloud Datastore

Entities and Properties Queries and Indexes Transactions

The Services Google Accounts, OpenID, and OAuth Google Cloud Endpoints Task Queues and Cron Jobs Namespaces Developer Tools The Cloud Console Getting Started

2. Creating an Application

Setting Up the Cloud SDK

Installing Java Installing Python Installing the Cloud SDK Authenticating with the Cloud SDK Installing the App Engine SDK Installing the Java SDK with the Google Plugin for Eclipse

Developing the Application

The User Preferences Pattern A Simple App Introducing JSPs, JSTL, and EL Users and Google Accounts Web Forms and the Datastore Caching with Memcache The Development Console

Registering the Application Uploading the Application Testing the App Enabling Billing

3. Configuring an Application

The App Engine Architecture Configuring a Java App App IDs and Versions Multithreading Request Handlers Static Files and Resource Files Domain Names Google Apps Configuring Secure Connections Secure Connections with Custom Domains Authorization with Google Accounts Environment Variables Inbound Services Custom Error Responses Java Servlet Sessions

4. Request Handlers and Instances

The Runtime Environment

The Sandbox Quotas and Limits

Request limits Service limits Deployment limits Projects Versions Billable quotas

The Java Runtime Environment

The Request Handler Abstraction Introducing Instances Request Scheduling and Pending Latency Warmup Requests Resident Instances Instance Classes and Utilization Instance Hours and Billing The Instances Console Panel Traffic Splitting

5. Using Modules

An Example Layout Configuring Modules

The Enterprise Archive Layout Making Modules with Eclipse

Manual and Basic Scaling

Manual Scaling and Versions

Startup Requests Shutdown Hooks Background Threads Modules and the Development Server Deploying Modules Addressing Modules with URLs

Calling Modules from Other Modules Module URLs and Secure Connections Module URLs and Custom Domains

Dispatching Requests to Modules Starting and Stopping Modules Managing and Deleting Modules and Versions The Modules API An Always-On Example

6. Datastore Entities

Entities, Keys, and Properties Introducing the Java Datastore API Property Values

Strings, Text, and Bytes Unset Versus the Null Value Multivalued Properties

Keys and Key Objects Using Entities

Getting Entities Using Keys Saving Entities Deleting Entities

Allocating System IDs The Development Server and the Datastore

7. Datastore Queries

Queries and Kinds Query Results and Keys The Query API

Building the Query Fetching Results with PreparedQuery Keys-Only Queries

Introducing Indexes Automatic Indexes and Simple Queries

All Entities of a Kind One Equality Filter Greater-Than and Less-Than Filters One Sort Order Queries on Keys Kindless Queries

Custom Indexes and Complex Queries

Multiple Sort Orders Filters on Multiple Properties Multiple Equality Filters

Not-Equal and IN Filters Unset and Nonindexed Properties Sort Orders and Value Types Queries and Multivalued Properties

MVPs in Code MVPs and Equality Filters MVPs and Inequality Filters MVPs and Sort Orders Exploding Indexes

Query Cursors Projection Queries Configuring Indexes

8. Datastore Transactions

Entities and Entity Groups

Keys, Paths, and Ancestors Ancestor Queries

What Can Happen in a Transaction

Transactional Reads Eventually Consistent Reads

Transactions in Java How Entities Are Updated How Entities Are Read Batch Updates How Indexes Are Updated Cross-Group Transactions

9. Datastore Administration

Inspecting the Datastore Managing Indexes Accessing Metadata from the App

Querying Statistics Querying Metadata Index Status and Queries Entity Group Versions

Remote Controls

Setting Up the Remote API Using the Remote API with the Java Client Library

10. The Java Persistence API

Setting Up JPA Entities and Keys Entity Properties Embedded Objects Saving, Fetching, and Deleting Objects Transactions in JPA Queries and JPQL Relationships For More Information

11. Using Google Cloud SQL with App Engine

Choosing a Cloud SQL Instance Installing MySQL Locally Creating a Cloud SQL Instance Connecting to an Instance from Your Computer Setting Up a Database Setting Up JDBC Connecting to the Database from App Engine Backup and Restore Exporting and Importing Data The gcloud sql Commands

12. The Memory Cache

Calling Memcache from Java Keys and Values Setting Values

Setting Values That Expire Adding and Replacing Values

Getting Values Deleting Values

Locking a Deleted Key

Atomic Increment and Decrement Compare and Set Batching Calls to Memcache Memcache and the Datastore Handling Memcache Errors Memcache Administration

Cache Statistics Flushing the Memcache

13. Fetching URLs and Web Resources

Fetching URLs Outgoing HTTP Requests

The URL The HTTP Method and Payload Request Headers

HTTP over SSL (HTTPS) Request and Response Sizes Request Deadlines Handling Redirects Response Objects

14. Sending and Receiving Email Messages

Sending Email Messages

Logging Sent Mail in the Development Server Sender Addresses Recipients Attachments Sending Email

Receiving Email Messages

15. Sending and Receiving Instant Messages with XMPP

Inviting a User to Chat Sending Chat Messages Receiving Chat Messages

Receiving Chat Messages in Java

Handling Error Messages Managing Presence

Managing Subscriptions Managing Presence Updates Probing for Presence

16. Task Queues and Scheduled Tasks

Configuring Task Queues Enqueuing a Task Task Parameters

Payloads Task Names Countdowns and ETAs

Push Queues

Task Requests Processing Rates and Token Buckets Retrying Push Tasks

Pull Queues

Enqueuing Tasks to Pull Queues Leasing and Deleting Tasks Retrying Pull Queue Tasks

Transactional Task Enqueueing Task Chaining Task Queue Administration Deferring Work Scheduled Tasks

Configuring Scheduled Tasks Specifying Schedules

17. Optimizing Service Calls

Calling Services Asynchronously

The Asynchronous Call API

Datastore Memcache URL Fetch

Visualizing Calls with AppStats

Installing AppStats Using the AppStats Console

18. Managing Request Logs

Writing to the Log Viewing Recent Logs Downloading Logs Logs Retention Querying Logs from the App

19. Deploying and Managing Applications

Uploading an Application Using Versions Managing Service Configuration App Engine Settings Managing Developers Quotas and Billing Getting Help

Index

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