Skills Matter Itbo April2010 Tapestry

transcript

In The Brain OfHoward M. Lewis Ship:

TWD Consulting, Inc.hlship@comcast.net

Tapestry 5: Java Power, Scripting Ease

Howard Lewis Ship

• Creator, Apache Tapestry

• Author, "Tapestry in Action"

• Independent Consultant

• Java Champion

What is Tapestry?

Open Source

Component Based

Developer Focused

Convention over

Configuration8

Concise9

Fast!10

Mature11

Tapestry Elements

Tapestry Templates

<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd"> <body> <h1>Please Login</h1>

<t:form> <t:label for="userId"/> <t:textfield value="userId"/> <br/> <t:label for="password"/> <t:passwordfield value="password"/> <br/> <input type="submit" value="Login"/> </t:form></html>

Login.tml

textfield

passwordfield

Page Classes

<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd"> <body> <h1>Please Login</h1>

<t:form> <t:label for="userId"/> <t:textfield value="userId"/> <br/> <t:label for="password"/> <t:passwordfield value="password"/> <br/> <input type="submit" value="Login"/> </t:form></html>

Login.tml

public class Login{ @Property private String userId;

@Property private String password;

Object onSuccess() { … }}

Login.java

Page Flows

void onValidate() { … }

Object onSuccess() { …

return UserProfile.class; }}

Login.java

public class UserProfile{ … }

UserProfile.java

Inversion of Control

@Inject private Session session;

@CommitAfter Object onSuccess() { …

User user = (User) session. …

user.setLastLogin(new Date());

return UserProfile.class; }}

Login.java

Inject IoC Service into field

Yourcode

Tapestry Services

Meta-Programming

@InjectPage private UserProfile userProfilePage; …

@Inject private Session session;

@CommitAfter Object onSuccess() { …

User user = (User) session. …

user.setLastLogin(new Date());

return userProfilePage; }}

Login.java

Generate getter & setter

Commit Hibernate transaction

State Management

public class UserProfile{ @Property @SessionState private UserEntity user;

@Property @Persist private Date searchStart;

UserProfile.java

Shared global value (any page)

This page only

Component

Template

Java Class

Message Catalog

Meta-Programming

Injections

❝Most software today is very much like an Egyptian pyramid with millions of bricks piled on top of each other, with no structural integrity, but just done by brute force and thousands of slaves.❞

Alan Kay, co-designer of the Smalltalk programming language

Developer Productivity

Live Class Reloading

Non-Tapestry Exception Reporting

Index does not contain a property named 'now'

Available properties: class, componentResources, currentTime

Scaffolding

@Entitypublic class BoardGame{ @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @NonVisual private long id;

@Validate("required") private String title;

private String creator;

private String publisher;

private Date published;

private boolean inPrint;

@Validate("required") @Column(nullable = false) private Genre genre;

@Validate("required") @Column(nullable = false) private Theme theme;

@Validate("min=1") private Integer minPlayers;

@Validate("min=1") private Integer maxPlayers;

@Validate("min=1,max=5") private Integer rating;

@DataType("longtext") private String notes;

BoardGame.java

Property Types

Naming Conventions

Annotations

Explicit Overrides

Localized Messages

Parameters

Feedback &Exploration

❝PHP and Rails have taught us that development speed is more important than we thought it was ... you really don’t understand a feature till you’ve built it, so the faster you can build them the faster you understand them.❞

Tim Bray, Director of Web Technologies, Sun Microsystems

Internationalization

page-title=Erstellen Sie eine neue Brettspieladd-game=Spiel hinzufŸgengame-added=Added Brettspiel

modern=Modernenmedieval=Mittelalterbible=Bibelabstract=Zusammenfassung

war_game=Kriegsspielcard=Karterole_playing=Rollenspielecooperative=Genossenschaft

creator-label=Schšpferpublisher-label=Verlagpublished-label=Veršffentlichtinprint-label=Im Drucktheme-label=Themaminplayers-label=Mindest-Spielermaxplayers-label=Maximale Spielernotes-label=Notation

Index_de.properties

<strong>${message}</strong>

<t:beaneditform submitlabel="message:add-game" object="game" />

</html>

Index.tml

Tapestry Components

Nested Components

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd" xmlns:p="tapestry:parameter"> <head> <title>${title}</title> </head> <body> … <div id="menu"> <ul> <li t:type="loop" source="pageNames" value="pageName" class="prop:classForPageName"> <t:pagelink page="prop:pageName">${pageName}</t:pagelink> </li> </ul> </div>

Layout.tml

Layout

title : StringpageNames : List

pageName : String

Layout

Loop PageLink

Render property pageName

Layout Components

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd" xmlns:p="tapestry:parameter"> <head> <title>${title}</title> </head> <body>

<t:body/>

</body></html>

Layout.tml

<t:beaneditform submitlabel="message:add-game" object="game" />

</html>

Index.tml

Component Parameters

public class Layout{ /** The page title, for the <title> element and the <h1> element. */ @Property @Parameter(required = true, defaultPrefix = BindingConstants.LITERAL) private String title;

@Property @Parameter(defaultPrefix = BindingConstants.LITERAL) private String sidebarTitle;

@Property @Parameter(defaultPrefix = BindingConstants.LITERAL) private Block sidebar;

@Property private String pageName;

Layout.java

Non-Template Components

public class OutputDate{ private final DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.MEDIUM);

@Parameter(required = true, allowNull = false) private Date date;

void beginRender(MarkupWriter writer) { writer.write(formatter.format(date)); }}

OutputDate.java

Component Rendering

SetupRender

BeginRender

Render Template

Render Body

AfterRender

CleanupRender

falsetrue

void beginRender(MarkupWriter writer) { writer.write(formatter.format(date)); }

OutputDate.java

<t:actionlink t:id="selectGame" context="game" zone="gameDetail"> ${game.title}</t:actionlink>

Games.tml

@Property private BoardGame game, selectedGame;

@InjectComponent private Zone gameDetail;

Object onActionFromSelectGame(BoardGame game) { selectedGame = game;

return gameDetail.getBody(); }

Partial Page Updates

<t:zone id="gameDetail" t:id="gameDetail"> <t:if test="selectedGame"> <strong>${selectedGame.title}</strong> by <strong>${selectedGame.creator}</strong> <br /> For ${selectedGame.minPlayers} - ↵${selectedGame.maxPlayers} players. </t:if></t:zone>

Games.tml

Games.java

.../games.selectGame/3

Encapsulation

TapestryPerformance

Request Processing Speed

Java == Fast

No Reflection

Page Pooling

GZIP Compression

Scalability55

JavaScript Aggregation

Far Future Expires Header

Caching58

Content Delivery Network

❝Architecture is the decisions that you wish you could get right early in a project.❞

Martin Fowler, Chief Scientist, ThoughtWorks

Conclusion

Infrastructure

Performance

Tapestry: The Expert is Built In

Tapestry 5 In Production

http://tapestry.apache.org

•Downloads•Mailing Lists•Component Reference•User's Guide•Wiki

http://jumpstart.doublenegative.com.au/

•Application Skeleton•Detailed tutorials

http://chenillekit.codehaus.org/

http://wookicentral.com/

•Collaborative Book Authoring•Useful blog•Spinning off libraries

http://tynamo.org/

•Domain-Driven Design•Improved Hibernate support•RESTful web services•JPA support

http://github.com/hlship/t5intro

http://howardlewisship.com

hlship@comcast.net

Tapestry 5 Development and SupportOn-site / Hands-on Tapestry Training

Skills Matter Itbo April2010 Tapestry

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