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Google App Engine. Danail Alexiev Technical Trainer SoftAcad.bg. Who’s Talking?. Danail Alexiev Software Consultant at Axway , technical trainer at SoftAcad learning center. Topics Today. What is Google App Engine(GAE) ? Why GAE ? Architecture of GAE Quota & Pricing - PowerPoint PPT Presentation
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Who’s Talking?•Danail AlexievoSoftware Consultant at Axway, technical trainer at SoftAcad learning center
Topics Today• What is Google App Engine(GAE) ?• Why GAE ?• Architecture of GAE• Quota & Pricing• Developing using GAE• Deploying Applications• Security• GAE datastore• Demo application
What is GAE?• Google’s platform to build Web
Applications on the cloud• Dynamic Web server• Transactional DataStore Model
Why GAE?• Automatic scaling and load balancing• Lower total cost of ownership• Web administration console & utilities• Enhances developing & deploying of
web applications• Multilanguage support (Java, Python,
GO..)• Secure environment (Sandbox)
Architecture of GAE
Quota & Pricinghttp://code.google.com/intl/bg-BG/appengine/docs/quotas.html#Resources
• $0.10 - $0.12 per CPU core-hour• $0.15 - $0.18 per GB-month of storage• $0.11 - $0.13 per GB outgoing bandwidth• $0.09 - $0.11 per GB incoming bandwidth
Developing using GAE
• Dynamic web servingo With full support for common web technologies
• Persistent storageo With queries, sorting and transactions
• Automatic scaling and load balancing• Google Account APIs
o For authenticating users and sending email• A local development environment
o That simulates Google App Engine on your computer• Task queues
o For performing work outside of the scope of a web request
• Scheduled tasks for triggering events
The Sandbox• Outgoing access via URL fetch or email
services• Incoming access via HTTP (or HTTPS)• Store state via App Engine datastore,
memcache• Respond to web request, queued task,
scheduled task• Return response data within 30 seconds• Quotas and Limits• Free 500MB of storage and 5 million page
views a month• 10 applications per developer account
The GAE Datastore
Intro to DS• Apparently based on BigTable• Absolutely not a relational
database• No joins (they do have “reference
fields”)• No aggregate queries - not even
count()!• Hierarchy affects sharding and
transactions• All queries must run against an
existing index
Models & Entities
• Data is stored as entities• Entities have properties - key/value pairs• An entity has a unique key• Entities live in a hierarchy, and siblings exist in the same entity groupo These are actually really important for
transactions and performance• A model is kind of like a class; it lets you define a type of entity
Developing using GAE
• Hello world• Datastore & entities• Memcache• Mail and Task Queues API• High Replication• Queues & Backends• Warmup requests• Pagination
Deployment• Register using admin console if not done
yet and get application ID• Uploading using eclipse plugin – just click
upload!
• Or using command line :
appengine-java-sdk\bin\appcfg.cmd [options] <action> <war-location>
Google App Engine
Homework1. Following the GAE tutorial at https://
developers.google.com/appengine/docs/java/gettingstarted/creating create and deploy a "Hello World" application in the GAE cloud.
2. Following the official GAE manuals (https://developers.google.com/appengine/docs/java/gettingstarted/) create and deploy a simple guestbook application in Java or Python.
In case you find difficulties, check the solution here: http://code.google.com/p/guestbook-java/As a result of your work send the source code + the URLs of your working application deployed in GAE.