Google App Engine

● Cloud Computing● Cos’è Google App Engine● Perchè PaaS● Performance● Esempi pratici

Agenda

● Iaas: Utilizzo di risorse hardware in remoto

● PaaS: virtualizzazione di una piattaforma

● SaaS: utilizzo di programmi installati su un server remoto

Cloud Computing

SaaS

PaaS

IaaS

GmailSalesforce

Google App Engine Windows Azure

Amazon AWSGoogle Compute Engine

Google App Engine is a Platform as a Service (PaaS) offering that lets you build and run applications on Google’s infrastructure

Cos’è App Engine

Perché PaaS

Web applications in un mondo IaaS:

● Gestione server virtuale

● Scalabilità?

● Bilanciamento del carico?

● Quali servizi implementare?

Perché PaaS

Perché PaaS

Scalabilità

Scalabilità

Bilanciamento del carico

Riduzione dei costi

App Engine Sandbox

App Engine Sandbox

Limiti:

● Connessioni in uscita: solo tramite i servizi offerti da App engine (URL fetch e le nuove socket Api)

● Connessioni in ingresso: solo HTTP(s) sulle porte 80 e 443

● No accesso in scrittura al Filesystem

● No codice nativo

● Tempi di esecuzione delle richieste limitati superiormente

App Engine Platform

https://developers.google.com/appengine/

Linguaggi disponibili

Batterie incluse

App Engine Demo

http://gdg-firenze.appspot.com/http://tiny.cc/gae-gdg-firenze

https://github.com/alessandro-aglietti/gdg-aperitivo-gae-1-aprile-2014

User Service

Single Sign-on for authentication

Integrated with all Google services

2-step authentication

https://developers.google.com/appengine/docs/java/users/

User Service Demo

Datastore

A distributed datastore that grows with your data

https://developers.google.com/appengine/docs/java/datastore/

Datastore Demo

Memcache

Distributed in-memory data cache in front of or in place of robust persistent storageSupports both synchronous and asynchronous caching

https://developers.google.com/appengine/docs/java/memcache/

Memcache Demo

Task Queue

For Background workSmall tasks are added to queues Process tasks based on the processing rate in the queue’s definitionApp Engine scales to make this possible

Cloud Endpoint

Authn/z with OAuth2APIs explorerDedicated frontendREST Client autogeneration

DOMANDE?