![Groovlets
import java.net.URLEncoder
if(params.artist) {
def response = urlFetch.fetch(new URL("http://musicbrainz.org/
ws/1/artist/?type=xml&name=${URLEncoder.encode(params.artist)}"))
def text = new String(response.content)
def xml = new XmlSlurper().parseText(text)
request.artists = xml.'artist-list'.artist
}
else {
request.artists = []
}
forward '/artistLookup.gtpl'](https://image.slidesharecdn.com/gaelyk-100618071644-phpapp01/85/Gaelyk-Lightweight-Groovy-on-the-Google-App-Engine-62-320.jpg)
![import java.net.URLEncoder
if(params.artist) {
def response = urlFetch.fetch(new URL("http://
musicbrainz.org/ws/1/artist/?type=xml&name=$
{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'](https://image.slidesharecdn.com/gaelyk-100618071644-phpapp01/85/Gaelyk-Lightweight-Groovy-on-the-Google-App-Engine-69-320.jpg)
![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'](https://image.slidesharecdn.com/gaelyk-100618071644-phpapp01/85/Gaelyk-Lightweight-Groovy-on-the-Google-App-Engine-70-320.jpg)
![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'](https://image.slidesharecdn.com/gaelyk-100618071644-phpapp01/85/Gaelyk-Lightweight-Groovy-on-the-Google-App-Engine-71-320.jpg)
![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'](https://image.slidesharecdn.com/gaelyk-100618071644-phpapp01/85/Gaelyk-Lightweight-Groovy-on-the-Google-App-Engine-72-320.jpg)
![Memcache
with Gaelyk
def countryFr = new Country(name: 'France')
memcache['FR'] = countryFr
if ('FR' in memcache) {
countryFromCache = memcache['FR']
}](https://image.slidesharecdn.com/gaelyk-100618071644-phpapp01/85/Gaelyk-Lightweight-Groovy-on-the-Google-App-Engine-104-320.jpg)
![Task Queues
queue.add countdownMillis: 10000,
url: '/task/emailTaskList',
taskName: 'Email current story assignments',
method: 'PUT',
params: [date: new Date()]](https://image.slidesharecdn.com/gaelyk-100618071644-phpapp01/85/Gaelyk-Lightweight-Groovy-on-the-Google-App-Engine-107-320.jpg)
Uploaded byTim Berglund
Gaelyk: Lightweight Groovy on the Google App Engine
The document discusses the Google App Engine (GAE) and its features, including its cloud-based app server capabilities, usage of various programming languages, and limitations such as the lack of support for Hibernate. It also highlights the Groovy framework enhancements like Groovlets and templating that integrate with GAE, alongside functionalities such as email, task queues, and XMPP for notifications. Finally, it mentions GAE emulation for development purposes and provides links for further exploration and resources.
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Gaelyk: Lightweight Groovy on the Google App Engine
- 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
- 6. Tell me about the Googl eApp Engine
- 7.
- 8.
- 9.
- 10.
- 11.
- 12.
- 13.
- 14.
- 15.
- 16.
- 17.
- 18.
- 19. Services It’s an appserver
- 20. Services With a fewextra features
- 21.
- 22.
- 23.
- 24.
- 25.
- 26.
- 27. Services Datastore Task Queue Authentication Caching XMPP Email
- 28. Services Datastore Task Queue Authentication Image API Caching XMPP Email
- 29. Services Datastore Task Queue Authentication Image API Caching URL Fetching XMPP Email
- 30. Services Datastore Task Queue Authentication Image API Caching URL Fetching XMPP OAuth Email
- 31. Services Datastore Task Queue Authentication Image API Caching URL Fetching XMPP OAuth Email Blobstore
- 32. But It’s notPerfect
- 33.
- 34.
- 35. Limitations The JDK whitelist http://code.google.com/appengine/docs/java/jrewhitelist.html
- 36. Limitations The JDK whitelist http://code.google.com/appengine/docs/java/jrewhitelist.html No Hibernate
- 37. Limitations The JDK whitelist http://code.google.com/appengine/docs/java/jrewhitelist.html No Hibernate Only JPA and JDO
- 38. Limitations The JDK whitelist http://code.google.com/appengine/docs/java/jrewhitelist.html No Hibernate Only JPA and JDO Grails is limited
- 39. Limitations The JDK whitelist http://code.google.com/appengine/docs/java/jrewhitelist.html No Hibernate Only JPA and JDO Grails is limited Performance problems?
- 40.
- 42.
- 43.
- 44.
- 45. Groovy-based Lightweight Page-centric Tightly coupled tothe Google App Engine
- 46. Groovy-based Lightweight Page-centric Tightly coupled tothe Google App Engine A better GAE than the GAE
- 47.
- 49.
- 50.
- 51. Serving Content Static content(like in a WAR)
- 52. Serving Content Static content(like in a WAR) Groovy templates
- 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 <% 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>${artist.name}</li> <% } %> </ul> <% include '/WEB-INF/includes/footer.gtpl' %>
- 56. Templates <% include '/WEB-INF/includes/header.gtpl'%> <h1>Look Up an Artist</h1> <form action="/artistLookup.groovy" method="POST"> <input type="text" size="50" name="artist"/> <input type="submit" value="Lookup"/> </form> <ul> <% request.artists.each { artist -> %> <li>${artist.name}</li> <% } %> </ul> <% include '/WEB-INF/includes/footer.gtpl' %>
- 57. 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>${artist.name}</li> <% } %> </ul> <% include '/WEB-INF/includes/footer.gtpl' %>
- 58.
- 59.
- 60.
- 61. Templates Lightweight, Groovy JSPs Downside:Scriptlets Request attributes bound from Groovlets
- 62. Groovlets import java.net.URLEncoder if(params.artist) { def response = urlFetch.fetch(new URL("http://musicbrainz.org/ ws/1/artist/?type=xml&name=${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'
- 63.
- 64.
- 65. Groovlets Groovy script, meetServlet Intrinsic variables
- 66. Groovlets Groovy script, meetServlet Intrinsic variables Forwarding
- 67. Groovlets Groovy script, meetServlet Intrinsic variables Forwarding Redirecting
- 68. Groovlets Groovy script, meetServlet Intrinsic variables Forwarding Redirecting MarkupBuilder
- 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 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'
- 71. 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'
- 72. 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'
- 73. import com.google.appengine.api.datastore.* import staticcom.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 staticcom.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 staticcom.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. import com.google.appengine.api.datastore.* import staticcom.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"
- 77. import com.google.appengine.api.datastore.* import staticcom.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"
- 78. import com.google.appengine.api.datastore.* import staticcom.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"
- 79.
- 80. URL Mapping Templates inwar/*.gtpl
- 81. URL Mapping Templates inwar/*.gtpl Groovlets in war/WEB-INF/groovy/*.groovy
- 82. URL Mapping Templates inwar/*.gtpl Groovlets in war/WEB-INF/groovy/*.groovy Pretty URLs with war/WEB-INF/routes.groovy
- 83.
- 84.
- 85. The Datastore Google’s BigTableinfrastructure
- 86. The Datastore Google’s BigTableinfrastructure Schemaless
- 87. The Datastore Google’s BigTableinfrastructure Schemaless Named entities (property bundles)
- 88. The Datastore Google’s BigTableinfrastructure Schemaless Named entities (property bundles) Indexed, queryable, sortable
- 89. The Datastore Google’s BigTableinfrastructure Schemaless Named entities (property bundles) Indexed, queryable, sortable Transactional
- 90. The Datastore Google’s BigTableinfrastructure Schemaless Named entities (property bundles) Indexed, queryable, sortable Transactional Great Groovy wrapper
- 91.
- 92.
- 93. Datastore Indexes Automatically generatedby default Override in WEB-INF/datastore-indexes.xml
- 94. 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>
- 95. Tell me about Other Services
- 96. Email in Java
- 97. 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."
- 98.
- 99. Inbound Email Enable inappengine-web.xml
- 100. Inbound Email Enable inappengine-web.xml Enable built-in servlet in web.xml
- 101. Inbound Email Enable inappengine-web.xml Enable built-in servlet in web.xml email.groovy Groovlet
- 102. Inbound Email Enable inappengine-web.xml Enable built-in servlet in web.xml email.groovy Groovlet The “message” intrinsic variable
- 103. Memcache in Java
- 104. Memcache with Gaelyk def countryFr = new Country(name: 'France') memcache['FR'] = countryFr if ('FR' in memcache) { countryFromCache = memcache['FR'] }
- 105. URL Fetch in Java
- 106. URL Fetch with Gaelyk def response = urlFetch.fetch(new URL("http://example.com")) def text = new String(response.content)
- 107. Task Queues queue.add countdownMillis:10000, url: '/task/emailTaskList', taskName: 'Email current story assignments', method: 'PUT', params: [date: new Date()]
- 108.
- 109. Task Queues Timed HTTPrequests
- 110. Task Queues Timed HTTPrequests Configure in war/WEB-INF/queue.xml
- 111. Task Queues Timed HTTPrequests Configure in war/WEB-INF/queue.xml http://code.google.com/appengine/docs/java/config/queue.html
- 112. Task Queues Timed HTTPrequests Configure in war/WEB-INF/queue.xml http://code.google.com/appengine/docs/java/config/queue.html Can update without redeploying
- 113. Task Queues Timed HTTPrequests Configure in war/WEB-INF/queue.xml http://code.google.com/appengine/docs/java/config/queue.html Can update without redeploying Can be secured
- 114.
- 115.
- 116. XMPP User notification XML payloadsfor distributed communication
- 117. XMPP User notification XML payloadsfor distributed communication Send messages with a Groovier API
- 118. XMPP User notification XML payloadsfor distributed communication Send messages with a Groovier API Receive messages through a servlet
- 119. XMPP Sending in Java
- 120. XMPP Sending with Gaelyk
- 121. 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()) {
- 122. 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()) { // ...
- 123. 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()) { // ... } }
- 124.
- 125. XMPP Receiving Enable inappengine-web.xml
- 126. XMPP Receiving Enable inappengine-web.xml Enable built-in servlet in web.xml
- 127. XMPP Receiving Enable inappengine-web.xml Enable built-in servlet in web.xml /war/WEB-INF/groovy/jabber.groovy
- 128. XMPP Receiving Enable inappengine-web.xml Enable built-in servlet in web.xml /war/WEB-INF/groovy/jabber.groovy The “message” intrinsic variable
- 129.
- 130.
- 131. Plugins Analogous to Grailsplugins
- 132. Plugins Analogous to Grailsplugins Mini Gaelyk apps
- 133. Plugins Analogous to Grailsplugins Mini Gaelyk apps plugins/xxxPluginDescriptor.groovy
- 134. Plugins Analogous to Grailsplugins Mini Gaelyk apps plugins/xxxPluginDescriptor.groovy Bundled as ZIP files
- 135. Plugins Analogous to Grailsplugins Mini Gaelyk apps plugins/xxxPluginDescriptor.groovy Bundled as ZIP files Ad-hoc discovery and distribution
- 136.
- 139. What about Services in development?
- 140.
- 141. GAE Emulation Datastore simulatedin filesystem
- 142. GAE Emulation Datastore simulatedin filesystem General Administration
- 143. GAE Emulation Datastore simulatedin filesystem General Administration http://localhost:8080/_ah/admin
- 144. GAE Emulation Datastore simulatedin filesystem General Administration http://localhost:8080/_ah/admin Authentication
- 145. GAE Emulation Datastore simulatedin filesystem General Administration http://localhost:8080/_ah/admin Authentication http://localhost:8080/_ah/login
- 146. GAE Emulation Datastore simulatedin filesystem General Administration http://localhost:8080/_ah/admin Authentication http://localhost:8080/_ah/login http://localhost:8080/_ah/logout
- 147.
- 148.
- 149. Thank You Tim Berglund www.augusttechgroup.com tim.berglund@augusttechgroup.com @tlberglund Using Your Existing Team
- 150.
Editor's Notes
- #3 On the JDK, we&#x2019;ve got options, and they&#x2019;re growing. Groovy is a better Java focused on strong Java interop, an easy migration path, and easy application coding.
- #4 Often the Java deployment story is less than happy. The Ops team gets it and feels great about it, but the PHP guys don&#x2019;t know what to do with us. We&#x2019;ve got great framework choices,
- #5 It should be an easy framework to learn and use.
- #6 Demo starting up a Gaelyk app.
- #8 You&#x2019;re running your app on Google&#x2019;s nearly infinitely scalable infrastructure. Go ahead, DDOS it!
- #9 You&#x2019;re running your app on Google&#x2019;s nearly infinitely scalable infrastructure. Go ahead, DDOS it!
- #10 You&#x2019;re running your app on Google&#x2019;s nearly infinitely scalable infrastructure. Go ahead, DDOS it!
- #11 You can sign up and get started and not pay a dime. You get certain free quotas.
- #12 GAE offers more than just transfer in and out and CPU. All services have their own quotas described at that URL. Since we&#x2019;re talking about Gaelyk, not GAE, we&#x2019;ll move on.
- #13 If you grow beyond the free quotas, you can always buy more. Internet scale, baby!
- #14 Started at Python. Now any language of the JVM, within limitations.
- #15 Started at Python. Now any language of the JVM, within limitations.
- #16 Started at Python. Now any language of the JVM, within limitations.
- #17 Started at Python. Now any language of the JVM, within limitations.
- #18 Started at Python. Now any language of the JVM, within limitations.
- #19 Started at Python. Now any language of the JVM, within limitations.
- #21 Remember, it&#x2019;s basically an app server.
- #22 Remember, it&#x2019;s basically an app server.
- #33 Remember, it&#x2019;s basically an app server.
- #34 Most of java.awt, javax.imageio, some java.nio, etc. Performance problems in Java have to do with first-request performance after a delay of no requests.
- #35 Most of java.awt, javax.imageio, some java.nio, etc. Performance problems in Java have to do with first-request performance after a delay of no requests.
- #36 Most of java.awt, javax.imageio, some java.nio, etc. Performance problems in Java have to do with first-request performance after a delay of no requests.
- #37 Most of java.awt, javax.imageio, some java.nio, etc. Performance problems in Java have to do with first-request performance after a delay of no requests.
- #38 Most of java.awt, javax.imageio, some java.nio, etc. Performance problems in Java have to do with first-request performance after a delay of no requests.
- #39 Most of java.awt, javax.imageio, some java.nio, etc. Performance problems in Java have to do with first-request performance after a delay of no requests.
- #46 All examples will be with TextMate and the Console. No Eclipse plugin necessary!
- #92 Attachments are optional.
- #93 Attachments are optional.
- #120 A discussion
- #121 PluginDescriptor can add bindings, etc.
- #122 PluginDescriptor can add bindings, etc.
- #123 PluginDescriptor can add bindings, etc.
- #124 PluginDescriptor can add bindings, etc.
- #125 PluginDescriptor can add bindings, etc.
- #127 The GAE SDK contains an embedded Jetty instance that emulates all appropriate services. The Eclipse plugin does this as well, but you don&#x2019;t have to use it.
- #128 It&#x2019;s also easy to deploy to GAE from the command line.