Dandelion 0.10.0
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A first presentation of the Dandelion project, recently released in v0.10.0. Slides are available online here: http://dandelion.github.io/slides/dandelion-0.10.0
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Dandelion 0.10.0
- 2. Quick introduction Brief history Dandelion-Core Dandelion-Datatables Some statistics Future Demo 2 / 101
- 3. Quick introduction Free & Open Source Java framework Focused on two aspects of Web development: Assets management (js, css): organization in bundles, HTML injection, soon asset minification and merging Integration of powerful Javascript librairies thanks to a set of components Licensed under BSD 3-Clause Hosted on Github Current version: 0.10.0 3 / 101
- 4. Thanks to... 4 / 101
- 5. Quick introduction Brief history Dandelion-Core Dandelion-Datatables Some statistics Future Demo 5 / 101
- 6. Brief history History 6 / 101
- 7. Quick introduction Brief history Dandelion-Core Dandelion-Datatables Some statistics Future Demo 7 / 101
- 9. Asset bundles Declarative approach, via JSON (soon XML and JavaConfig) { "bundle":"jquery", "assets":[ { "name":"jquery", "version":"1.11.1", "type":"js", "locations":{ "webapp":"/assets/js/jquery-1.11.1.js" } } ] } Several locations are allowed for each asset: webapp, classpath, CDN, JAR, WebJar and API! See the docs 9 / 101
- 10. Dependencies between bundles You can declare one or more bundles as dependencies { "bundle":"select2", "dependencies":["jquery"], "assets":[ { "name":"select2", "version":"3.4.8", "type":"js", "locations":{ "webapp":"/assets/js/select2.js" } },{ "name":"select2", "version":"3.4.8", "type":"css", "locations":{ "webapp":"/assets/css/select2.css" } } ] } 10 / 101
- 11. Asset locators Internal components used by Dandelion to fetch assets in different ways Used via the corresponding location key in the bundle declaration See the docs 11 / 101
- 12. Project your-project |__src |__main |__webapp |__assets |__js |__app.js Asset locators — webapp 12 / 101
- 13. Project Bundle { "bundle":"my-bundle", "assets":[{ "name":"my-application", "version":"1.0.0", "type":"js", "locations":{ "webapp":"/assets/js/app.js" } }] } Asset locators — webapp 13 / 101
- 14. Project Bundle HTML <scriptsrc="/[contextPath]/assets/js/app.js"></script> Asset locators — webapp 14 / 101
- 15. Project your-project |__src |__main |__resources |__js |__app.js Asset locators — classpath 15 / 101
- 16. Project Bundle { "bundle":"my-bundle", "assets":[{ "name":"my-application", "version":"1.0.0", "type":"js", "locations":{ "classpath":"js/app.js" } }] } Asset locators — classpath 16 / 101
- 17. Project Bundle HTML <scriptsrc="/[contextPath] /dandelion-assets /[cacheKey] /app.js"></script> Asset locators — classpath 17 / 101
- 18. Bundle { "bundle":"jquery", "assets":[{ "name":"jquery", "version":"1.11.0", "type":"js", "locations":{ "cdn":"//cdnjs.cloudflare.com/.../jquery.js" } }] } Asset locators — cdn 18 / 101
- 19. Bundle HTML <scriptsrc="//cdnjs.cloudflare.com/.../jquery.js"></script> Asset locators — cdn 19 / 101
- 20. JAR datatables-core |__src |__main |__resources |__META-INF |__resources |__folder |__js |__app.js Asset locators — jar 20 / 101
- 22. JAR Bundle HTML Inside a Servlet 2.0+ container: <scriptsrc="/[contextPath] /dandelion-assets /[cacheKey] /app.js"></script> Inside a Servlet 3.0+ container: <scriptsrc="/[contextPath]/folder/js/app.js"></script> Dandelion automatically detects whether the running server is using the Servlet 3.x API or lower Asset locators — jar 22 / 101
- 23. New dependency <dependency> <groupId>com.github.dandelion</groupId> <artifactId>dandelion-webjars</artifactId> <version>0.10.0</version> </dependency> This artifact brings a new dependency to the webjars- locator project, which is internally used by the locator to locate assets inside WebJars Asset locators — webjar 23 / 101
- 24. New dependency WebJar <dependency> <groupId>org.webjars</groupId> <artifactId>bootstrap</artifactId> <version>3.2.0</version> </dependency> Asset locators — webjar 24 / 101
- 25. New dependency WebJar Bundle { "bundle":"my-bundle", "assets":[{ "name":"bootstrap", "version":"3.2.0", "type":"css", "locations":{ "webjar":"bootstrap.css" } }] } Asset locators — webjar 25 / 101
- 26. New dependency WebJar Bundle HTML Inside a Servlet 2.0+ container: <linkrel="stylesheet"href="/[contextPath] /dandelion-assets /[cacheKey] /bootstrap.css"/> Inside a Servlet 3.0+ container: <linkrel="stylesheet"href="/[contextPath] /webjars /bootstrap /3.2.0 /css /bootstrap.css"/> Dandelion automatically detects whether the running server is using the Servlet 3.x API or lower Asset locators — webjar 26 / 101
- 27. Asset locators — delegate Reads the content of an asset from a special parameter stored inside the AssetRequestContext This special parameter: must be stored under the DelegateLocator.DELEGATED_CONTENT_PARAM key must be a class that implements DelegatedContentand where the getContent()method must return the asset content to be injected ] 27 / 101
- 28. Bundle { "bundle":"my-bundle", "assets":[{ "name":"my-generated-asset", "version":"1.0.0", "type":"js", "locations":{ "delegate":"app.js" } }] } Asset locators — delegate 28 / 101
- 29. Bundle Generator publicclassSomeJavascriptGenerator implementsDelegatedContent{ @Override publicStringgetContent(HttpServletRequestrequest){ return"alert('Hey!');"; } } Asset locators — delegate 29 / 101
- 30. Bundle Generator ARC AssetRequestContext .get(request) .addParameter("my-generated-asset", DelegateLocator.DELEGATED_CONTENT_PARAM, newSomeJavascriptGenerator()); Asset locators — delegate 30 / 101
- 31. Bundle Generator ARC HTML <scriptsrc="/[contextPath] /dandelion-assets /[cacheKey] /app.js"></script> Where app.js: alert('Hey!'); Asset locators — delegate 31 / 101
- 32. Bundle loaders Scan for bundles in the classpath, in the following order: VendorBundleLoader: intended to load vendor bundles (e.g. jquery.json) ComponentBundleLoader: intended to load components bundles (e.g. ddl- dt.json) DandelionBundleLoader: intended to load user bundles (e.g. custom- bundle.json) See the docs 32 / 101
- 33. Bundle graph On the application startup, Dandelion creates a Contextthat will be injected into each request. This Contextprovide several information: all configuration options (coming from the properties files) a bundle graph (DAG), built from all scanned bundles Example: src |__main |__resources |__dandelion |__jquery.json |__select2.json See the docs 33 / 101
- 34. Interacting with the bundle graph 1/4) Using the JSP taglib <%@taglibprefix="dandelion"uri="http://github.com/dandelion"%> <dandelion:bundleincludes="select2"/> 2/4) Using the Thymeleaf dialect <!DOCTYPEhtml> <htmlxmlns:th="http://www.thymeleaf.org" xmlns:ddl="http://github.com/dandelion" ddl:bundle-includes="select2"> ... </html> See the docs 34 / 101
- 35. Interacting with the bundle graph 3/4) Using the fluent API AssetRequestContext .get((HttpServletRequest)request) .addBundle("select2"); 4/4) Using the configuration file ("permanent" bundles) bundle.includes=select2 See the docs 35 / 101
- 36. Interacting with the bundle graph Whatever the technology used, Dandelion automatically injects all requested assets into the HTML code: in the right order in the configured position, by default CSS in <head>and JS just before </body> and (soon) applies the right HTTP headers, therefore optimizing browser caching <html> <head> <linkhref="/context/assets/css/select2.css"/> </head> <body> ... <scriptsrc="/context/assets/js/jquery-1.11.1.js"></script> <scriptsrc="/context/assets/js/select2.js"></script> </body> </html> 36 / 101
- 37. Asset processors Intended to process assets, in different ways... Built-in processors: jsMinYui:JS minification based on Yahoo's YUI Compressor cssMinYui:CSS minification based on Yahoo's YUI Compressor cssMin:CSS minification based on a fork of YUI jsMin:JS minification based on a fork of YUI cssUrlRewriting:Image URLs rewriting in CSS Soon: cssLess: Convert Less resources to CSS cssSass: Convert Sass resources to CSS cssImport: Processes @import coffeeScript: Convert CoffeeScript to JavaScript ... See the docs 37 / 101
- 38. Development/production modes Development mode Built-in dev tools available Server-side caching disabled Browser caching disabled Production mode No bundle graph viewer, no bundle reloading Minification enabled Server-side caching enabled (soon) Browser caching enabled (soon) GZIP compression (soon) Asset versioning (soon) JMX monitoring 38 / 101
- 39. Devtools Bundle graph viewer Dev tool allowing to visualize how Dandelion-Core handles assets, in the current request http://example.com/context/some/uri?showGraph Available in development mode only See the docs 39 / 101
- 40. Devtools Bundle graph viewer Asset reloading During development, both server-side and client-side caching are disabled. Client-side, Dandelion-Core applies the following HTTP headers: Cache-Control = no-cache,no-store,must- revalidate(HTTP 1.1) Pragma = no-cache(HTTP 1.0) Expires = 0(Proxies) 40 / 101
- 41. Devtools Bundle graph viewer Asset reloading Bundle reloading During development, all changes made in asset bundles can be reflected. Just manually append a new reloadBundlesrequest parameter to the current URL to perform a full bundle reloading. http://example.com/context/some/uri?reloadBundles Available in development mode only 41 / 101
- 43. Properties Filter init param filter init param > dandelion.properties <filter> <filter-name>dandelion</filter-name> <filter-class>...DandelionFilter</filter-class> <init-param> <param-name>dandelion.mode<param-name> <param-value>production</param-value> </init-param> </filter> Configuration options 43 / 101
- 44. Properties Filter init param System property system property > filter init param > dandelion.properties -Ddandelion.mode=production Configuration options See the docs 44 / 101
- 45. Quick introduction Brief history Dandelion-Core Dandelion-Datatables Some statistics Future Demo 45 / 101
- 46. Introducing Dandelion-Datatables First and most advanced component of the Dandelion framework Facilitates the integration of DataTables, an awesome jQuery plugin which will add advanced interaction controls to any HTML table Easy to use Easy to extend Inspired by the excellent DisplayTag library 46 / 101
- 47. Key features JSP & Thymeleaf support Typical features such as paging, filtering and sorting DOM sources, AJAX sources and server-side processing Responsive design Export in multiple formats Several themes available: Bootstrap 2, Bootstrap 3, jQueryUI I18n Integration with Spring/Spring MVC and other projects 47 / 101
- 48. What it looks like with JSP? <%@taglibprefix="datatables"uri="http://github.com/dandelion/datatables"%> <datatables:tableid="myTableId"data="${persons}"> <datatables:columntitle="Id"property="id"/> <datatables:columntitle="LastName"property="lastName"/> <datatables:columntitle="FirstName"property="firstName"/> <datatables:columntitle="City"property="address.town.name"/> <datatables:columntitle="Mail"property="mail"/> </datatables:table> id: HTML pass-through attribute data: DOM source, collection of POJOs title: sets the content of the column header property: name of the object's attribute of the collection being iterated on 48 / 101
- 49. What it looks like with Thymeleaf? <tableid="myTableId"dt:table="true"> <thead> <tr> <th>Id</th> <th>Firstname</th> <th>Lastname</th> <th>City</th> <th>Mail</th> </tr> </thead> <tbody> <trth:each="person:${persons}"> <tdth:text="${person.id}">1</td> <tdth:text="${person.firstName}">John</td> <tdth:text="${person.lastName}">Doe</td> <tdth:text="${person?.address?.town?.name}">Nobodyknows!</td> <tdth:text="${person.mail}">john@doe.com</td> </tr> </tbody> </table> dt:table: enables the Dandelion-Datatables dialect in the current table 49 / 101
- 50. HTML The HTML is generated: either by Dandelion-Datatables (JSP) or directly by Thymeleaf <tableid="myTableId"> <thead> <tr> <th>Id</th> <th>Firstname</th> <th>Lastname</th> <th>City</th> <th>Mail</th> </tr> </thead> <tbody> <tr> <td>1</td> <td>Wing</td> <td>Cunningham</td> <td></td> <td>ornare.libero@mail.edu</td> </tr> ... </tbody> </table> How it works? 50 / 101
- 51. HTML JavaScript As well as the JS code that initializes DataTables varoTable_myTableId=$('#myTableId'); varoTable_myTableId_params={ "aoColumns":[ {"mData":"id","sDefaultContent":""}, {"mData":"lastName","sDefaultContent":""}, {"mData":"firstName","sDefaultContent":""}, {"mData":"address.town.name","sDefaultContent":""}, {"mData":"mail","sDefaultContent":""} ] } $(document).ready(function(){ oTable_myTableId.dataTable(oTable_myTableId_params); }); How it works? 51 / 101
- 52. HTML JavaScript Required assets An AssetRequestContextis filled with the required assets, either by the JSP taglib or by the Thymeleaf dialect... AssetRequestContext .get(request) .addBundle("datatables") .addBundle("ddl-dt") ...; ... so that they will be injected by Dandelion-Core into the response <linkhref="//cdn/jquery.dataTables.css"/> ... <scriptsrc="//cdn/jquery.js"></script> <scriptsrc="//cdn/jquery.dataTables.js"></script> <scriptsrc="/[contextPath] /dandelion-assets /[SHA] /dandelion-datatables-0.10.0.js"></script> How it works? 52 / 101
- 53. Usage examples 53 / 101
- 54. HTML (DOM) sources Read data directly from the DOM Works well with small/medium data sources 54 / 101
- 55. Controller Example with a Spring MVC controller @Controller publicclassController{ @ModelAttribute("persons") publicList<Person>populateTable(){ returnpersonService.findAll(); } } HTML sources — example 55 / 101
- 56. Controller JSP <datatables:tableid="myTableId"data="${persons}"> <datatables:columntitle="Id"property="id"/> ... </datatables:table> HTML sources — example 56 / 101
- 57. Controller JSP Thymeleaf <tableid="myTableId"dt:table="true"> ... <tbody> <trth:each="person:${persons}"> <tdth:text="${person.id}">1</td> ... </tr> </tbody> <table> HTML sources — example 57 / 101
- 58. AJAX sources Read data from virtually any JSON data source that can be obtained by AJAX Client-side processing Works well with small/medium data sources 58 / 101
- 59. Controller Example with a Spring MVC controller @Controller publicclassAjaxController{ @RequestMapping(value="/persons") public@ResponseBodyList<Person>findAll(){ returnpersonService.findAll(); } } AJAX sources 59 / 101
- 60. Controller JSP <datatables:tableid="myTableId"url="/persons"> <datatables:columntitle="Id"property="id"/> ... </datatables:table> Dandelion-Datatables rewrites URLs by appending the context path, if needed. AJAX sources 60 / 101
- 62. AJAX sources + server-side processing Read data from virtually any JSON data source that can be obtained by AJAX Server-side processing Each draw of the table will result in a new AJAX request being made to get the required data Works well with small/medium/large data sources 62 / 101
- 63. AJAX sources + server-side processing Dandelion-Datatables provides a convenient API DatatablesCriterias Stores all DataTables parameters (current page, entries to display, sorted columns, ...) @RequestMapping(value="/persons") public@ResponseBodyDatatablesResponse<Person> filter(HttpServletRequestrequest){ //MapsrequestparametertoaDatatablesCriteriasinstance DatatablesCriteriascriterias= DatatablesCriterias.getFromRequest(request); ... 63 / 101
- 64. AJAX sources + server-side processing Dandelion-Datatables provides a convenient API DataSet All entries returned by the data access layer should be wrapped in this class in order to build a DataTablesResponse ... //Getfilteredandpageddata DataSet<Person>persons= personService.findPersons(criterias); ... 64 / 101
- 65. AJAX sources + server-side processing Dandelion-Datatables provides a convenient API DataTablesResponse Contains a builder that helps to return the data in the format required by DataTables Must be converted into JSON ... //BuildtheresponsethatwillbeconvertedtoJSON returnDatatablesResponse.build(persons,criterias); } 65 / 101
- 66. Controller Example with a Spring MVC AJAX controller @RequestMapping(value="/persons") public@ResponseBodyDatatablesResponse<Person> filter(HttpServletRequestrequest){ //MapsrequestparametertoaDatatablesCriteriasinstance DatatablesCriteriascriterias= DatatablesCriterias.getFromRequest(request); //Getfilteredandpageddata DataSet<Person>persons= personService.findPersons(criterias); //BuildtheresponsethatwillbeconvertedtoJSON returnDatatablesResponse.build(persons,criterias); } AJAX sources + server-side processing 66 / 101
- 67. Controller JSP <datatables:table...url="/persons"serverSide="true"> <datatables:columnproperty="id"/> <datatables:columnproperty="firstName"/> <datatables:columnproperty="lastName"/> <datatables:columnproperty="address.town.name"/> <datatables:columnproperty="mail"/> </datatables:table> AJAX sources + server-side processing 67 / 101
- 68. Controller JSP Thymeleaf <table...dt:url="@{/persons}"dt:serverSide="true"> <thead> <tr> <thdt:property="id">Id</th> <thdt:property="firstName">Firstname</th> <thdt:property="lastName">Lastname</th> <thdt:property="address.town.name">City</th> <thdt:property="mail">Mail</th> </tr> </thead> </table> AJAX sources + server-side processing 68 / 101
- 69. JSP <datatables:table...pageable="false"> <datatables:column...sortable="false"/> <datatables:column...filterable="true"/> ... </datatables:table> Paging, sorting, filtering 69 / 101
- 71. Export — what formats? Text-basedformats: CSV, XML Built-in support, no dependency or extra required. 71 / 101
- 72. Export — what formats? Binary-basedformats: PDF, XLS, XLSX Some extras already exist and provide: an export class that is used by default if the corresponding export format is enabled the corresponding library in compile scope (e.g. Apache POI for the XLS format) Available extras: PDF: datatables-export-itext XLS: datatables-export-poi XLSX: datatables-export-poi-ooxml 72 / 101
- 73. Export — 2 ways Filter-based Fast to set up Always export full data source Only compatible with DOM sources Controller-based Requires a bit more work to set up WYSIWYE => What You See Is What You ... Export! Compatible with DOM and AJAX sources 73 / 101
- 85. I18n: DataTables' information datatables.properties: non-translatable properties global.css.class=tabletable-stripedtable-borderedtable-condensed global.extra.theme=bootstrap2 datatables_EN.properties: all EN translations global.i18n.msg.processing=Processing... global.i18n.msg.search=Search: global.i18n.msg.info=Showing_START_to_END_of_TOTAL_entries datatables_FR.properties: all FR translations global.i18n.msg.processing=Traitementencours... global.i18n.msg.search=Rechercher: global.i18n.msg.info=Affichagedel'élément_START_à_END_sur_TOTAL_éléments 85 / 101
- 86. I18n: column headers Based on LocaleResolverand MessageResolverinterfaces Built-in implementations: SpringLocaleResolver/ SpringMessageResolver JstlLocaleResolver/ JstlMessageResolver Struts1LocaleResolver/ Struts1MessageResolver Struts2LocaleResolver/ Struts2MessageResolver Possible to plug-in custom locale and message resolvers 86 / 101
- 87. Spring config <beanid="messageSource"class="..."> <propertyname="basename"value="classpath:messages"/> </bean> I18n: example with Spring 87 / 101
- 91. Theming Supported themes: jQueryUI ThemeRoller Bootstrap 2 Tablecloth Responsive Bootstrap 3 Responsive 91 / 101
- 94. Quick introduction Brief history Dandelion-Core Dandelion-Datatables Some statistics Future Demo 94 / 101
- 95. Some statistics 35 releases (source: GitHub, all repos) 15 pull requests merged (source: GitHub, all repos) 9 contributors from 6 countries (source: GitHub, all repos) 1432 commits (source: Ohloh) 121,770 LOC (source: Ohloh) 98 GitHub stars (source: GitHub, all repos) ~80 followers on Twitter (source: Twitter) ~270 topics, ~10000 views in the forum (source: Nabble) 3200+ redeploys/restarts prevented, saving about 106h (source: JRebel) 95 / 101
- 96. Quick introduction Brief history Dandelion-Core Dandelion-Datatables Some statistics Future Demo 96 / 101
- 97. Dandelion- Core Full support for asset minification and merging Improvements on asset bundles: externalization, configuration via XML, JavaConfig Add new processors for meta-frameworks (CoffeeScript, Less, ...) Add support for conditionnal assets (e.g. IE8+, IE9+) Add support for CSS sprites New AssetCacheimplementation based on Hazelcast JBoss Forge plugin allowing to scaffold a project based on Dandelion Add support for RequireJS Bower integration Future 97 / 101
- 98. Dandelion- Core Dandelion- Datatables New extension for editable tables (Editor, jEditable, ...) Add support for more DataTables' extensions Add support for DataTables 1.10.0 New theme for Foundation Add WebSocket support for continously-updating tables (Atmosphere, Spring MVC 4) Add support for Spring Data REST Future 98 / 101
- 99. Dandelion- Core Dandelion- Datatables New components! Dandelion-GUA? (Google Universal Analytics) Dandelion-Forms? All ideas are welcome! Future 99 / 101
- 100. Quick introduction Brief history Dandelion-Core Dandelion-Datatables Some statistics Future Demo 100 / 101