You need to be really productive: - PowerPoint Presentation

You need to be really productive: Then Try Apache Tapestry Nikola BogdanovMay 27 ‘15, Sofia 27/05/2015 1

Agenda Introduction to Apache TapestryHistoryPhilosophy and principlesStructure of typical Tapestry applicationMain components Service lifecycleInternal memory and page lifecycleORM integrationDisadvantages of TapestryShort Demo27/05/2015 2

Apache TapestryTapestry is an open-source frameworkThe framework is built upon the standard Java Servlet API To the application server, a Tapestry application is just a servlet filterA Tapestry application is divided into a set of pages, each constructed from components 27/05/20153

Structure of a Tapestry Application 27/05/20154

Main terminologyPages ComponentsServices 27/05/20155

Tapestry History Created by Howard Lewis Ship, adopted by the Apache Software Foundation as a top-level project in 20061.0 – 2.0v 2000-04 Developed by Howard Lewis Ship3.0v 2004 - Available under the GNU Lesser General Public License 4.0v 2006 - release under Apache, as a Jakarta sub-project5.0v 2008 POJO-based component model, new no-XML Inversion of Control5.1v 20095.2v 20105.3v 20115.3.1 – 5.3.7v 20135.3.8v 2014 Current stable version5.4 Beta 2014 Switchable jQuery/Prototype support 27/05/2015 6

Tapestry Philosophy Improves developer productivityFocus on coding, not configuring. Convention over configuration. Just store your classes in the appropriate placeTapestry framework is non-intrusive. The framework adapts to your code your classes are pure POJOsCombining pages and components with small amounts of code Non-stop development via Live-reloading featureModular and Testable, also ScalableClear error messages27/05/2015 7

Error Message Example27/05/2015 8

Notable Features Live Class Reloading Tapestry monitors changes to Page, Component and service and performs hot-swapping into the running applicationComponent-based Conventions and annotations, no xmlSpare use of HTTPSession Tapestry is highly efficient in a clustered, session-replicated environment.Post/Redirect/Get Most form submissions follow the Post/Redirect/Get (PRG) patternInversion of Control (IOC) Configurable and replaceable Tapestry is built on a lightweight IoC layerHTML based Template elements, Markup language and AJAX support27/05/2015 9

Tapestry and Maven Maven ArchetypeProject Structure 27/05/201510

Closer look into the Main Elements Pages – A Tapestry page is a duo, consisting of a Java class and a template, which may be accessed through a URL Components - Components are reusable blocks of code for a Tapestry applicationServices - Typically small and easy testable pieces of the business logicMixins - small unit of functionality used to supplement existing components with additional behaviour without changing the source code <input t:type="textfield" t:id="country" t:mixins="Autocomplete"/>Entities - Hibernate entities 27/05/2015 11

Configuration and ControlWeb.xml IoC Registry Modules 27/05/201512

IoC Registry is the central place to retrieve service 27/05/2015 13

The services are defined across multiple modules 27/05/2015 14

ModulesModule is an ordinary Java class which is used to configure the IoC RegistryThree types of modules A module class methods obey naming conventions or are annotated depending on their purpose: 1. binder method: used to define a service2. builder method: used to build a service manually3. contributor method: used to contribute to a service's configuration4. decorator method: used to intercept method invocations on a service5. advisor method: same as decorator method but is more general. 27/05/2015 15

Memory and page instances Tapestry brings true object-orientation into web application developmentStore into fields of your classes, not inside the HttpSessionTapestry maintains an in-memory cache for page instancesIf page is requested, Tapestry looks in the cache for an instance Page instance for every supported locale27/05/201516

Page / Locale matrix 27/05/2015 17

Multi-threaded environment via per-thread Maps 27/05/2015 18

Page life cycle and event handlers PageLoaded state => onPageLoaded() Active state => onActivate()Is the request loopbback?PageReset state => onPageReset()27/05/201519

Persist A persistent property’s value is persisted from one request to the nextUsually stored into the HttpSessionCould be reset using the pageReset event handler27/05/201520

Page Render & Handling form component events 27/05/2015 21

Integrating HibernateSupports Hibernate 3 and Hibernate 4Obtaining Hibernate session in pages and componentsThe Session instance created by Tapestry may be injected into a page for interaction with the database.27/05/201522

Criticism Not being backward-compatible across major versionsEarly criticisms of Tapestry 5 also mentioned documentation as a shortcoming Since version 5.0, Tapestry has bundled the Prototype and Scriptaculous JavaScript libraries27/05/2015 23

DemoReally simple example 27/05/2015 24

Books and Community on Tapestry http://jumpstart.doublenegative.com.au/home.htmlhttp://tynamo.org/ http://apache-tapestry-mailing-list-archives.1045711.n5.nabble.com/users-tapestry-apache-org-Mailing-List-Archives-f2375125.htmlhttp://tapestry.apache.org/community.htmlhttp://apache-tapestry-mailing-list-archives.1045711.n5.nabble.com/ 27/05/201525

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THANK YOU :) You can find me at: nikola.k.bogdanov@gmail.com Nikola Bogdanov May 27 ’15, Sofia 27/05/2015 27