1.
Lightweight
on the
by Tim Berglund

2.
Tell me about
aGreat
Application
Language

3.
Tell me
a
Happy
Tale
of
Deployment

4.
and
Make it
Fast

5.
Tell me about
the
Googl
eApp
Engine

6.
An App Server

7.
In the CLoud

8.
Google
Infrastructure

9.
Usually Free!

10.
Quotas
http://code.google.com/appengine/docs/quotas.html

11.
Quotas
http://code.google.com/appengine/docs/quotas.html

12.
Pricing

13.
Languages

14.
Languages

15.
Languages

16.
Languages

17.
Services

18.
Services
It’s an app server

19.
Services
With a few extra
features

20.
Services

21.
Services
Datastore

22.
Services
Datastore
Authentication

23.
Services
Datastore
Authentication
Caching

24.
Services
Datastore
Authentication
Caching
XMPP

25.
Services
Datastore
Authentication
Caching
XMPP
Email

26.
Services
Datastore Task Queue
Authentication
Caching
XMPP
Email

27.
Services
Datastore Task Queue
Authentication Image API
Caching
XMPP
Email

28.
Services
Datastore Task Queue
Authentication Image API
Caching URL Fetching
XMPP
Email

29.
Services
Datastore Task Queue
Authentication Image API
Caching URL Fetching
XMPP OAuth
Email

30.
Services
Datastore Task Queue
Authentication Image API
Caching URL Fetching
XMPP OAuth
Email Blobstore

31.
But It’s not Perfect

32.
Limitations

33.
Limitations
The JDK whitelist

34.
Limitations
The JDK whitelist
http://code.google.com/appengine/docs/java/jrewhitelist.html

35.
Limitations
The JDK whitelist
http://code.google.com/appengine/docs/java/jrewhitelist.html
No Hibernate

36.
Limitations
The JDK whitelist
http://code.google.com/appengine/docs/java/jrewhitelist.html
No Hibernate
Only JPA and JDO

37.
Limitations
The JDK whitelist
http://code.google.com/appengine/docs/java/jrewhitelist.html
No Hibernate
Only JPA and JDO
Grails is limited

38.
Limitations
The JDK whitelist
http://code.google.com/appengine/docs/java/jrewhitelist.html
No Hibernate
Only JPA and JDO
Grails is limited
Performance problems?

39.
Tell me about

40.
Groovy-based

41.
Groovy-based
Lightweight

42.
Groovy-based
Lightweight
Page-centric

43.
Groovy-based
Lightweight
Page-centric
Tightly coupled to the Google App Engine

44.
Groovy-based
Lightweight
Page-centric
Tightly coupled to the Google App Engine
A better GAE than the GAE

45.
Setting up Gaelyk

46.
Serving Content

47.
Serving Content

48.
Serving Content
Static content (like in a WAR)

49.
Serving Content
Static content (like in a WAR)
Groovy templates

50.
Templates
<% include '/WEB-INF/includes/header.gtpl' %>
<h1>Look Up an Artist</h1>
<form action="/artistLookup.groovy" method="POST">
<input type="text" size="50" name="artist"/>
<input type="submit" value="Lookup"/>
</form>
<ul>
<% request.artists.each { artist -> %>
<li>${artist.name}</li>
<% } %>
</ul>
<% include '/WEB-INF/includes/footer.gtpl' %>

51.
Templates
<% include '/WEB-INF/includes/header.gtpl' %>
<h1>Look Up an Artist</h1>
<form action="/artistLookup.groovy" method="POST">
<input type="text" size="50" name="artist"/>
<input type="submit" value="Lookup"/>
</form>
<ul>
<% request.artists.each { artist -> %>
<li>${artist.name}</li>
<% } %>
</ul>
<% include '/WEB-INF/includes/footer.gtpl' %>

52.
Templates
<% include '/WEB-INF/includes/header.gtpl' %>
<h1>Look Up an Artist</h1>
<form action="/artistLookup.groovy" method="POST">
<input type="text" size="50" name="artist"/>
<input type="submit" value="Lookup"/>
</form>
<ul>
<% request.artists.each { artist -> %>
<li>${artist.name}</li>
<% } %>
</ul>
<% include '/WEB-INF/includes/footer.gtpl' %>

53.
Templates
<% include '/WEB-INF/includes/header.gtpl' %>
<h1>Look Up an Artist</h1>
<form action="/artistLookup.groovy" method="POST">
<input type="text" size="50" name="artist"/>
<input type="submit" value="Lookup"/>
</form>
<ul>
<% request.artists.each { artist -> %>
<li>${artist.name}</li>
<% } %>
</ul>
<% include '/WEB-INF/includes/footer.gtpl' %>

54.
Templates
<% include '/WEB-INF/includes/header.gtpl' %>
<h1>Look Up an Artist</h1>
<form action="/artistLookup.groovy" method="POST">
<input type="text" size="50" name="artist"/>
<input type="submit" value="Lookup"/>
</form>
<ul>
<% request.artists.each { artist -> %>
<li>${artist.name}</li>
<% } %>
</ul>
<% include '/WEB-INF/includes/footer.gtpl' %>

55.
Templates

56.
Templates
Lightweight, Groovy JSPs

57.
Templates
Lightweight, Groovy JSPs
Downside: Scriptlets

58.
Templates
Lightweight, Groovy JSPs
Downside: Scriptlets
Request attributes bound from Groovlets

59.
Groovlets
import java.net.URLEncoder
if(params.artist) {
def response = urlFetch.fetch(new URL("http://musicbrainz.org/
ws/1/artist/?type=xml&name=${URLEncoder.encode(params.artist)}"))
def text = new String(response.content)
def xml = new XmlSlurper().parseText(text)
request.artists = xml.'artist-list'.artist
}
else {
request.artists = []
}
forward '/artistLookup.gtpl'

60.
Groovlets

61.
Groovlets
Groovy script, meet Servlet

62.
Groovlets
Groovy script, meet Servlet
Intrinsic variables

63.
Groovlets
Groovy script, meet Servlet
Intrinsic variables
Forwarding

64.
Groovlets
Groovy script, meet Servlet
Intrinsic variables
Forwarding
Redirecting

65.
Groovlets
Groovy script, meet Servlet
Intrinsic variables
Forwarding
Redirecting
MarkupBuilder

66.
import java.net.URLEncoder
if(params.artist) {
def response = urlFetch.fetch(new URL("http://
musicbrainz.org/ws/1/artist/?type=xml&name=$
{URLEncoder.encode(params.artist)}"))
def text = new String(response.content)
def xml = new XmlSlurper().parseText(text)
request.artists = xml.'artist-list'.artist
}
else {
request.artists = []
}
forward '/artistLookup.gtpl'

67.
import java.net.URLEncoder
if(params.artist) {
def response = urlFetch.fetch(new URL("http://
musicbrainz.org/ws/1/artist/?type=xml&name=$
{URLEncoder.encode(params.artist)}"))
def text = new String(response.content)
def xml = new XmlSlurper().parseText(text)
request.artists = xml.'artist-list'.artist
}
else {
request.artists = []
}
forward '/artistLookup.gtpl'

68.
import java.net.URLEncoder
if(params.artist) {
def response = urlFetch.fetch(new URL("http://
musicbrainz.org/ws/1/artist/?type=xml&name=$
{URLEncoder.encode(params.artist)}"))
def text = new String(response.content)
def xml = new XmlSlurper().parseText(text)
request.artists = xml.'artist-list'.artist
}
else {
request.artists = []
}
forward '/artistLookup.gtpl'

69.
import java.net.URLEncoder
if(params.artist) {
def response = urlFetch.fetch(new URL("http://
musicbrainz.org/ws/1/artist/?type=xml&name=$
{URLEncoder.encode(params.artist)}"))
def text = new String(response.content)
def xml = new XmlSlurper().parseText(text)
request.artists = xml.'artist-list'.artist
}
else {
request.artists = []
}
forward '/artistLookup.gtpl'

70.
import com.google.appengine.api.datastore.*
import static com.google.appengine.api.datastore.FetchOption
if(!user) {
redirect users.createLoginURL(request.requestURL.toString(
return
}
def query = new Query("project")
query.addSort("dateCreated", Query.SortDirection.ASCENDING)
PreparedQuery preparedQuery = datastore.prepare(query)
request.projects = preparedQuery.asList( withOffset(0) )
forward "/WEB-INF/views/project/list.gtpl"

71.
import com.google.appengine.api.datastore.*
import static com.google.appengine.api.datastore.FetchOption
if(!user) {
redirect users.createLoginURL(request.requestURL.toString(
return
}
def query = new Query("project")
query.addSort("dateCreated", Query.SortDirection.ASCENDING)
PreparedQuery preparedQuery = datastore.prepare(query)
request.projects = preparedQuery.asList( withOffset(0) )
forward "/WEB-INF/views/project/list.gtpl"

72.
import com.google.appengine.api.datastore.*
import static com.google.appengine.api.datastore.FetchOption
if(!user) {
redirect users.createLoginURL(request.requestURL.toString(
return
}
def query = new Query("project")
query.addSort("dateCreated", Query.SortDirection.ASCENDING)
PreparedQuery preparedQuery = datastore.prepare(query)
request.projects = preparedQuery.asList( withOffset(0) )
forward "/WEB-INF/views/project/list.gtpl"

73.
import com.google.appengine.api.datastore.*
import static com.google.appengine.api.datastore.FetchOption
if(!user) {
redirect users.createLoginURL(request.requestURL.toString(
return
}
def query = new Query("project")
query.addSort("dateCreated", Query.SortDirection.ASCENDING)
PreparedQuery preparedQuery = datastore.prepare(query)
request.projects = preparedQuery.asList( withOffset(0) )
forward "/WEB-INF/views/project/list.gtpl"

74.
import com.google.appengine.api.datastore.*
import static com.google.appengine.api.datastore.FetchOption
if(!user) {
redirect users.createLoginURL(request.requestURL.toString(
return
}
def query = new Query("project")
query.addSort("dateCreated", Query.SortDirection.ASCENDING)
PreparedQuery preparedQuery = datastore.prepare(query)
request.projects = preparedQuery.asList( withOffset(0) )
forward "/WEB-INF/views/project/list.gtpl"

75.
import com.google.appengine.api.datastore.*
import static com.google.appengine.api.datastore.FetchOption
if(!user) {
redirect users.createLoginURL(request.requestURL.toString(
return
}
def query = new Query("project")
query.addSort("dateCreated", Query.SortDirection.ASCENDING)
PreparedQuery preparedQuery = datastore.prepare(query)
request.projects = preparedQuery.asList( withOffset(0) )
forward "/WEB-INF/views/project/list.gtpl"

76.
URL Mapping

77.
URL Mapping
Templates in war/*.gtpl

78.
URL Mapping
Templates in war/*.gtpl
Groovlets in war/WEB-INF/groovy/*.groovy

79.
URL Mapping
Templates in war/*.gtpl
Groovlets in war/WEB-INF/groovy/*.groovy
Pretty URLs with
war/WEB-INF/routes.groovy

80.
The Datastore

81.
The Datastore

82.
The Datastore
Google’s BigTable infrastructure

83.
The Datastore
Google’s BigTable infrastructure
Schemaless

84.
The Datastore
Google’s BigTable infrastructure
Schemaless
Named entities (property bundles)

85.
The Datastore
Google’s BigTable infrastructure
Schemaless
Named entities (property bundles)
Indexed, queryable, sortable

86.
The Datastore
Google’s BigTable infrastructure
Schemaless
Named entities (property bundles)
Indexed, queryable, sortable
Transactional

87.
The Datastore
Google’s BigTable infrastructure
Schemaless
Named entities (property bundles)
Indexed, queryable, sortable
Transactional
Great Groovy wrapper

88.
Datastore Indexes

89.
Datastore Indexes
Automatically generated by default

90.
Datastore Indexes
Automatically generated by default
Override in WEB-INF/datastore-indexes.xml

91.
Datastore Indexes
Automatically generated by default
Override in WEB-INF/datastore-indexes.xml
<?xml version="1.0" encoding="utf-8"?>
<datastore-indexes
autoGenerate="true">
<datastore-index kind="Employee" ancestor="false">
<property name="lastName" direction="asc" />
<property name="hireDate" direction="desc" />
</datastore-index>
<datastore-index kind="Project" ancestor="false">
<property name="dueDate" direction="asc" />
</datastore-index>
</datastore-indexes>

92.
Tell me about
Other
Services

93.
Email in Java

94.
Email
with Gaelyk
mail.send sender: 'story-admin@augusttechgroup.com',
to: 'tlberglund@gmail.com',
subject: 'Story Complete',
textBody: "A story you edited has increased
in priority. Check it out."

95.
Inbound Email

96.
Inbound Email
Enable in appengine-web.xml

97.
Inbound Email
Enable in appengine-web.xml
Enable built-in servlet in web.xml

98.
Inbound Email
Enable in appengine-web.xml
Enable built-in servlet in web.xml
email.groovy Groovlet

99.
Inbound Email
Enable in appengine-web.xml
Enable built-in servlet in web.xml
email.groovy Groovlet
The “message” intrinsic variable

100.
Memcache
in Java

101.
Memcache
with Gaelyk
def countryFr = new Country(name: 'France')
memcache['FR'] = countryFr
if ('FR' in memcache) {
countryFromCache = memcache['FR']
}

102.
URL Fetch
in Java

103.
URL Fetch
with Gaelyk
def response = urlFetch.fetch(new URL("http://example.com"))
def text = new String(response.content)

104.
Task Queues
queue.add countdownMillis: 10000,
url: '/task/emailTaskList',
taskName: 'Email current story assignments',
method: 'PUT',
params: [date: new Date()]

105.
Task Queues

106.
Task Queues
Timed HTTP requests

107.
Task Queues
Timed HTTP requests
Configure in war/WEB-INF/queue.xml

108.
Task Queues
Timed HTTP requests
Configure in war/WEB-INF/queue.xml
http://code.google.com/appengine/docs/java/config/queue.html

109.
Task Queues
Timed HTTP requests
Configure in war/WEB-INF/queue.xml
http://code.google.com/appengine/docs/java/config/queue.html
Can update without redeploying

110.
Task Queues
Timed HTTP requests
Configure in war/WEB-INF/queue.xml
http://code.google.com/appengine/docs/java/config/queue.html
Can update without redeploying
Can be secured

111.
XMPP

112.
XMPP
User notification

113.
XMPP
User notification
XML payloads for distributed communication

114.
XMPP
User notification
XML payloads for distributed communication
Send messages with a Groovier API

115.
XMPP
User notification
XML payloads for distributed communication
Send messages with a Groovier API
Receive messages through a servlet

116.
XMPP Sending
in Java

117.
XMPP Sending
with Gaelyk

118.
XMPP Sending
with Gaelyk
def recipient = 'tlberglund@gmail.com'
if (xmpp.getPresence(recipient).isAvailable()) {
def status = xmpp.send(to: recipient,
body: "Glad you're into Gaelyk!")
if (!status.isSuccessful()) {

119.
XMPP Sending
with Gaelyk
def recipient = 'tlberglund@gmail.com'
if (xmpp.getPresence(recipient).isAvailable()) {
def status = xmpp.send(to: recipient,
body: "Glad you're into Gaelyk!")
if (!status.isSuccessful()) {
// ...

120.
XMPP Sending
with Gaelyk
def recipient = 'tlberglund@gmail.com'
if (xmpp.getPresence(recipient).isAvailable()) {
def status = xmpp.send(to: recipient,
body: "Glad you're into Gaelyk!")
if (!status.isSuccessful()) {
// ...
}
}

121.
XMPP Receiving

122.
XMPP Receiving
Enable in appengine-web.xml

123.
XMPP Receiving
Enable in appengine-web.xml
Enable built-in servlet in web.xml

124.
XMPP Receiving
Enable in appengine-web.xml
Enable built-in servlet in web.xml
/war/WEB-INF/groovy/jabber.groovy

125.
XMPP Receiving
Enable in appengine-web.xml
Enable built-in servlet in web.xml
/war/WEB-INF/groovy/jabber.groovy
The “message” intrinsic variable

126.
Plugins

127.
Plugins

128.
Plugins
Analogous to Grails plugins

129.
Plugins
Analogous to Grails plugins
Mini Gaelyk apps

130.
Plugins
Analogous to Grails plugins
Mini Gaelyk apps
plugins/xxxPluginDescriptor.groovy

131.
Plugins
Analogous to Grails plugins
Mini Gaelyk apps
plugins/xxxPluginDescriptor.groovy
Bundled as ZIP files

132.
Plugins
Analogous to Grails plugins
Mini Gaelyk apps
plugins/xxxPluginDescriptor.groovy
Bundled as ZIP files
Ad-hoc discovery and distribution

133.
Development

134.
What about
Services
in development?

135.
GAE Emulation

136.
GAE Emulation
Datastore simulated in filesystem

137.
GAE Emulation
Datastore simulated in filesystem
General Administration

138.
GAE Emulation
Datastore simulated in filesystem
General Administration
http://localhost:8080/_ah/admin

139.
GAE Emulation
Datastore simulated in filesystem
General Administration
http://localhost:8080/_ah/admin
Authentication

140.
GAE Emulation
Datastore simulated in filesystem
General Administration
http://localhost:8080/_ah/admin
Authentication
http://localhost:8080/_ah/login

141.
GAE Emulation
Datastore simulated in filesystem
General Administration
http://localhost:8080/_ah/admin
Authentication
http://localhost:8080/_ah/login
http://localhost:8080/_ah/logout

142.
Code

143.
On github
git@github.com:tlberglund/august-stories.git
git@github.com:tlberglund/august-demo.git

144.
Thank You
Tim Berglund
www.augusttechgroup.com
tim.berglund@augusttechgroup.com
@tlberglund
Using Your Existing Team

145.
Photo Credits
Parchment Background
http://www.photoshopstar.com/effects/recreate-indiana-jones-text-effect/