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Overview
PaaS Run web apps on Google's infrastructure Easy to build, Easy to maintain, Easy to
scale API Support languages: Python, Java(JVM-
based interpreter or compiler), Go Domain: http://youappid.appspot.com/ Who's using App Engine
Runtime Environment(Java)
Servlet Environment, Java 6 No state 30 seconds limit Sandbox: walled arena
Saving entities1. Entity e = new Entity(“STUDENT”);2. e.name = “zhangsan”;3. datastore.put( e );
Deleting entity1. Entity e = datastore.get(key);2. datastore.delete( e );
Query API
Query q = new Query("Person"); q.addFilter("lastName", Query.FilterOperator.EQUAL, lastNameParam); q.addFilter("height", Query.FilterOperator.LESS_THAN, maxHeightParam); PreparedQuery pq = datastore.prepare(q); for (Entity result : pq.asIterable()) { }
GQL: SQL-like, no join
GQL syntax: SELECT [* | <property list> | __key__]
FROM <kind>[WHERE <condition> [AND <condition> ...]][ORDER BY <property> [ASC | DESC] [, <property> [ASC | DESC] ...]][LIMIT [<offset>,]<count>][OFFSET <offset>]
<condition> := <property> {< | <= | > | >= | = | != } <value><condition> := <property> IN <list><condition> := ANCESTOR IS <entity or key>
Task Queues and Cron Jobs
Work that can’t be done within 30sec Ensures every task gets done
eventually Enqueue task within transaction Cron Jobs: scheduled tasks
Administration console
Web-based interface Create and manage app View resource usage statistics View logs
Why GAE?
Scalability Lower total cost of ownership Rich set of APIs Fully featured SDK for local
development Ease of deployment Web administration console and
diagnostic utilities
Pricing and Quotas
Free quotas pricing
Instance Hours 28 hours/day $0.08 / hour
Datastore Stored Data
1G $0.24 / G / month
Outgoing Bandwidth 1G/day $0.12 / G
Email API 100 recipients/day $0.01 / 100 recipients
Datastore API 50k free read/write/small
$0.10/100k write ops$0.07/100k read ops$0.01/100k small ops
Useful resources
https://developers.google.com/appengine/
http://www.google.com/enterprise/cloud/appengine/pricing.html