What s new in Spring Web Flow 2.0

Transcription

1 What s new in Spring Web Flow 2.0 Agim Emruli SpringSource Germany Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

2 About me Senior Consultant Spring / Spring Web Flow Training and Consulting agim.emruli@springsource.com Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 2

3 Agenda Web Flow overview Web Flow 2.0 features Spring Faces What s coming Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 3

4 Agenda Web Flow overview Web Flow 2.0 features Spring Faces What s coming Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 4

5 Web Flow Overview Web application Framework Provides a flow abstraction for page flows States Transitions Events Fills the gap between stateless http and conversational (web) applications Integration into modern web frameworks JSF, Spring MVC, Struts 1.x DOJO, ExtJS Part of the Spring portfolio Production ready since 2006 Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 5

6 Web Flow 2.0 Features Web framework integration Flow managed persistence context Message abstraction Security Other improvements Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 6

7 Web Framework Integration In SWF 1.0 Spring Web Flow 1.0 provides out-ofthe-box integrations for Spring MVC Java Server Faces Struts 1.x Integration through framework specific controllers Web Flow handles the action phase Web framework handles the render phase Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 7

8 Web Framework Integration In SWF 1.0 request response Front Controller View Controller 1 Controller 2 Controller n Spring Web Flow Controller Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 8

9 Web Framework Integration In SWF 1.0 Advantages Easy adoption smooth migration path Web Flow can be easily added into an existing application Mix and match SWF for complex flows Controllers for standard navigation Disadvantages No control of the rendering process in Web Flow No Flow Managed Resources for view rendering Front controller specific error handling Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 9

10 Web Framework Integration In SWF 2.0 Spring Web Flow handles the action and view rendering phase One controller engine with full control over the lifecycle Unified front controller servlet Integration through Spring s DispatcherServlet One configuration across all web frameworks The view technology is interchangeable Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 10

11 Web Framework Integration In SWF 2.0 request response Spring DispatcherServlet View Controller 1 Controller 2 Controller n Spring Web Flow Controller Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 11

12 Web Framework Integration In SWF 2.0 Advantages Unified listener model Persistent context management Error handling Security No ugly servlet filters Interchangeable view-technologies Mix JSF views with Spring MVC views Unified SWF configuration across web frameworks Disadvantages More changes in the existing Front Controller setup Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 12

13 Integration Summary Spring Web Flow 2.0 supports both integration styles New integration style opens new possibilities Management of view specific state inside the Web Flow system JSF component state Unified front controller interface across web frameworks Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 13

14 Flow Managed Persistence Services O/R Mappers need a persistence context Represents the unit-of-work Caches domain objects Dirty detection for changed objects Persistence Context is typically transaction scoped Not available for view-rendering LazyLoadingExceptions Every transaction creates a new context Objects must be manually reattached to the new context NonUnqiueObjectExceptions No cache reuse across transactions Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 14

15 Transaction Scoped Persistence Context Flow Event Event Transaction Transaction Persistence context Persistence context P D P Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 15

16 Flow Managed Persistence Context Persistence context is controlled through the Flow lifecycle One persistence context per Flow Dirty Objects are active through the Flow lifecycle until the end Changed will be flushed/discarded at the end of the flow Persistence context is available while rendering the view Persistence context is restorable through continuations Almost atomic conversations Depends on key generation strategy Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 16

17 Flow Managed Persistence Context Flow Event Event Transaction Transaction Persistence context P P Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 17

18 Flow Managed Persistence Context Persistence Context is activated on a per-flowbasis <flow> <peristence-context> </flow> Commit and rollback behaviour is end-state driven <end-state id= processbooking > <attribute name="commit" value="true" type="boolean" /> </end-stade> Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 18

19 Flow Managed Persistence Context Summary Web Flow supports multiple O/R Mappers Hibernate JPA (OpenJPA, Toplink Essentials) Caveats are Concurrent modification Time to flush Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 19

20 Message Abstraction Unified message abstraction, across different web frameworks Also available after a redirect Fluent interface context.getmessagecontext().addmessage( new MessageBuilder(). source("checkindate"). defaulttext("some default message").error().build()) Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 20

21 Flow Security Spring Security protects different resources URL resources Method calls Web Flow 2.0 uses Spring Security to enforce security constraints in the flow Flow States Transitions Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 21

22 Other Improvements Improved Back handling Spring Web Flow scopes for the BeanFactory Conversation, flow Flow inheritance Convenience shortcuts inside the flow definition Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 22

23 Agenda Web Flow overview Web Flow 2.0 features Spring Faces What s coming Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 23

24 What is Spring Faces? Spring s JSF integration library JSF 1.1 or JSF 1.2 Spring Faces is currently shipped as module of the Spring Web Flow 2.0 distribution Runs on Java 1.4 or > Provides complete support for developing component-based web applications with JSF Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 24

25 Spring Faces Architecture Builds on Spring Web Flow in three ways For view event handling / navigation For application state management For modularization of your JSF application Provides a progressive JSF component library Degrades when javascript is not available on client Built on a new Spring UI Javascript abstraction framework Integrates Dojo 1.0 Provides Ajax support in a JSF environment Integrates with the Facelets templating engine and all popular JSF component libraries Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 25

26 Spring Faces Architecture Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 26

27 Spring Faces Features Zero faces-config configuration All features are enabled for you simply by putting springfaces.jar in your classpath All the power of Web Flow Define rich, modular definitions of application flow Get conversational and intra-page state management Map UI events directly to backing Spring beans Built in support for the POST+REDIRECT+GET pattern Progressive command-button, command-link, and validation components Ajax enabled components Signal intra-page events that invoke actions and re-render fragments of the current page Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 27

28 Spring Faces Sample Application Walkthrough Consider the Hotel Booking sample application Partitioned into two modules A main module that lets you perform searches, view results, and select a result for booking A booking module that helps you book a hotel Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 28

29 Modular Approach Each module encapsulates all of its dependent UI artifacts The module s flow definition Defines control flow and UI event handling logic JSF view templates Resources such as message bundles Modules can invoke each other main may call booking during the course of its execution Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 29

30 Hotel Booking Modules Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 30

31 Module Flow Definition Module control logic is implemented using a Web Flow definition For example, the main flow definition defines the rules to Render the main search page on startup Respond to JSF action events on postback to continue processing Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 31

32 Main Web Flow Definition Example <flow> <view-state id= mainsearchpage" view="main.xhtml"> <transition on="findhotels" to= resultspage" /> <transition on="cancelbooking" to="cancelbooking" /> </view-state> <view-state id= resultspage" view= results.xhtml"> <render-actions> <action method="findhotels" bean="mainactions" /> </render-actions> <transition on="selecthotel" to= detailspage /> <transition on="changesearch" to= mainsearchpage"/> </view-state> <flow> Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 32

33 JSF View Templates Rendered JSF templates are just standard JSF views Integrating other JSF component libraries is straightforward You may also use the Spring Faces component library to progressively enhance the page with Javascript behavior If Javascript is available on the client Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 33

34 Spring Faces Progressive Components <sf:commandbutton> Is Javascript available? If yes, fire a Ajax action event when the button is clicked; only re-render components effected by the event in the response If no, submit the form as normal, causing a full page refresh <sf:commandlink> Is Javascript available? If yes, render as a link that submits a form If no, render link as a plain button Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 34

35 Spring Faces Progressive Validation <sf:clienttextvalidator> - decorate a text field with string validation <sf:numbertextvalidator> - decorate a text field with number validation <sf:datetextvalidator> - decorate a text field with a date chooser <sf:currencytextvalidator> - decorate a text field with money validation <sf:validateallonclick> - force validation of all fields when a command button is clicked Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 35

36 Agenda General Topics Spring Faces What s Coming Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 36

37 What s Coming Spring Web Flow 2.0 Milestone 4 this week 2.0 Final in Q2/2008 Spring Web 3.0 A new, declarative site definition language Powerful new ways of defining site control logic, including a Groovy-based DSL Further JSF integration convenience Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 37

38 Site Definition Language Example <site id="hotels"> <page id="search"> <var name="criteria" class="ebookings.hotels.searchcriteria" /> <transition event="search" target="results"/> <input name="criteria" /> </transition> </page> <page id="results"> <on-entry><eval exp="${criteria.executesearch()}" /></on-entry> <transition event="select" to="book"> <input name="hotelid" value="${eventparams.selection.id}" </transition> </page> <flow id="book"> <transition event="bookingauthorized" target="search" /> </flow> </site> Each page is bookmarkable at a resource URI Transition input is sent through the page redirect for you! Starts a controlled navigation (no bookmarking the steps of it) Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 38

39 Summary Spring Web Flow 2.0 introduces a new universal controller engine Support for extended persistence context Spring Security integration Powerful JSF integration... Backward compatible to Web Flow 1.0 Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited. 39

40 Q & A Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.

41 Thanks! Agim Emruli Copyright 2008 SpringSource. Copying, publishing or distributing without express written permission is prohibited.