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DESCRIPTION
The Ext GWT Data Loading API provides a powerful and flexible mechanism for retrieving remote or local data and binding the data to user interface components. During this session, you will learn will learn the difference between Data Loaders, Proxies and Readers and how they work together.
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Ext GWTData Loading
DARRELL MEYER, SENCHASVEN BRUNKEN, SENCHA
Monday, November 29, 2010
OverviewConference App
ModelsLoaders
Loading ExamplesQuestions
Monday, November 29, 2010
Conference App
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Ext GWT 2.2.1GWT 2.1
Java Persistence API (JPA)Google App Engine (GAE)
RequestFactoryGWT MVPDependency Injection with Gin
Download at http://dev.sencha.com/playpen/gxt/conference-app.zip
Technology Stack
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Eclipse IDE for Java EE Developers (Helios 3.6.1)http://www.eclipse.org/downloads/
PluginsMaven Integration for Eclipsehttp://m2eclipse.sonatype.org/sites/m2e
Maven Integration for Eclipse WTP Integrationhttp://m2eclipse.sonatype.org/sites/m2e-extras
Google Eclipsehttp://code.google.com/eclipse/
IDE & Plugins
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Models
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Generic data type used throughout Ext GWTAllows form of introspectionInterface based with default implementation
Models & ModelData
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Implement ChangeEventSourceModel implements ChangeEventSourceChangeListeners added to ModelsModels EventsUpdateAdd, Remove, Update TreeModel
Change Events & Listeners
Monday, November 29, 2010
Create Model instances from POJOsUse GWT RPC with non-modelsPOJOs need to be markedBeanModelMarker (indirect)BeanModelTag (direct)BeanModelLookup & BeanModelFactoryBeanModelReader
BeanModel
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Loaders
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Responsible for loading remote dataDelegates work to DataProxy & DataReaderInterface based with default implsSupports 3 eventsBeforeLoadLoadLoadException
Loader
Loader
DataProxy DataReader
Loader
ListLoader TreeLoader
PagingLoaderRemoteSortTreeLoader
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Retrieve remote contentAny data type supported
DataProxy
DataProxy
HttpProxy MemoryProxy
PagingModelMemoryProxy
ScriptTagProxyRpcProxy
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Coverts raw data to ModelData instances
DataReader
DataReader
BeanModelReader JsonReader
JsonLoadResultReader
TreeBeanModelReaderModelReader
TreeModelReader XmlReader
XmlLoadResultReader
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Loading Examples
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Example uses ScriptTagProxy, HttpProxy, & RpcProxy
DataProxy Example
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Define the data with ModelTypeCreate DataProxyCreate DataReaderCreate Loader
DataProxy Example
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Server implementation usingFilterPagingLoadConfigPagingLoadResult
Paging Loader Example
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Questions?
Monday, November 29, 2010
Thanks!Twitter @darrellmeyer
Portions of this presentation from the GWT documentation licensed under the Creative Commons Attribution 3.0 License
Monday, November 29, 2010
