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<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title><![CDATA[MootCube.info]]></title>
<link href="http://mootcube.info/atom.xml" rel="self"/>
<link href="http://mootcube.info/"/>
<updated>2012-11-30T04:26:31+01:00</updated>
<id>http://mootcube.info/</id>
<author>
<name><![CDATA[Mathieu Chataigner]]></name>
</author>
<generator uri="http://octopress.org/">Octopress</generator>
<entry>
<title type="html"><![CDATA[Shipper des API, du Web avec Scala et de l'Android en mode hackathon]]></title>
<link href="http://mootcube.info/blog/2012/11/30/shipping-scala-webapp-en-mode-hackathon/"/>
<updated>2012-11-30T00:00:00+01:00</updated>
<id>http://mootcube.info/blog/2012/11/30/shipping-scala-webapp-en-mode-hackathon</id>
<content type="html"><-->
<p>Voici tout d’abord une rapide présentation de l’application.</p>
<h3>Le squelette de l’application</h3>
<p>Ce soir, il s’agit d’implémenter une application nommée ‘kplaner’ qui propose un doodle pour choisir une/des séance(s) de cinéma. Elle est composée d’une partie UI en Android, et d’une partie serveur en Scala avec l’API JSON. La partie Web Service REST va être gérée grâce à le toolkit Unfiltered.</p>
<p>Les spécifications:
- je peux choisir une date et un ciné
- on peut me proposer la liste des films qui sont autour de ces horaires, je peux checker ceux qui me branchent
- je peux envoyer des invitations à mes potes par tous les moyens qui me semblent bons</p>
<h3>Unfiltered</h3>
<p>Voici une rapide présentation de Unfiltered:</p>
<ul>
<li>la déclaration d’un web service avec l’opération HTTP Get et une réponse au format JSON s’écrit sous forme d’un contrat (intent) et ses chemins :</li>
</ul>
<figure class='code'><figcaption><span>création d’un web service Rest</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class='scala'><span class='line'><span class="cm">/** unfiltered plan */</span>
</span><span class='line'><span class="k">trait</span> <span class="nc">KApp</span> <span class="k">extends</span> <span class="n">unfiltered</span><span class="o">.</span><span class="n">filter</span><span class="o">.</span><span class="nc">Plan</span> <span class="o">{</span>
</span><span class='line'> <span class="n">self</span><span class="k">:</span> <span class="kt">KinoService</span> <span class="kt">with</span> <span class="kt">KPlanerCreationService</span> <span class="o">=></span>
</span><span class='line'>
</span><span class='line'> <span class="k">def</span> <span class="n">intent</span> <span class="k">=</span> <span class="o">{</span>
</span><span class='line'> <span class="k">case</span> <span class="nc">GET</span><span class="o">(</span><span class="nc">Path</span><span class="o">(</span><span class="s">"/kinolist"</span><span class="o">))</span> <span class="k">=></span> <span class="n">jsonResponse</span><span class="o">(</span><span class="n">listKinos</span><span class="o">())</span>
</span><span class='line'> <span class="k">case</span> <span class="nc">GET</span><span class="o">(</span><span class="nc">Path</span><span class="o">(</span><span class="s">"/filmlist"</span><span class="o">))</span> <span class="k">=></span> <span class="n">jsonResponse</span><span class="o">(</span><span class="n">listFilms</span><span class="o">())</span>
</span><span class='line'> <span class="k">case</span> <span class="nc">GET</span><span class="o">(</span><span class="nc">Path</span><span class="o">(</span><span class="s">"/sessions"</span><span class="o">))</span> <span class="k">=></span> <span class="n">jsonResponse</span><span class="o">(</span><span class="n">listShowing</span><span class="o">())</span>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'><span class="o">}</span>
</span></code></pre></td></tr></table></div></figure>
<ul>
<li>le lancement du serveur:</li>
</ul>
<figure class='code'><figcaption><span>création d’un serveur unfiltered</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
<span class='line-number'>12</span>
<span class='line-number'>13</span>
<span class='line-number'>14</span>
</pre></td><td class='code'><pre><code class='scala'><span class='line'><span class="cm">/** embedded server */</span>
</span><span class='line'><span class="k">object</span> <span class="nc">Server</span> <span class="o">{</span>
</span><span class='line'> <span class="k">def</span> <span class="n">main</span><span class="o">(</span><span class="n">args</span><span class="k">:</span> <span class="kt">Array</span><span class="o">[</span><span class="kt">String</span><span class="o">])</span> <span class="o">{</span>
</span><span class='line'> <span class="k">val</span> <span class="n">http</span> <span class="k">=</span> <span class="n">unfiltered</span><span class="o">.</span><span class="n">jetty</span><span class="o">.</span><span class="nc">Http</span><span class="o">(</span><span class="mi">8080</span><span class="o">)</span> <span class="c1">// this will not be necessary in 0.4.0</span>
</span><span class='line'> <span class="n">http</span><span class="o">.</span><span class="n">context</span><span class="o">(</span><span class="s">"/assets"</span><span class="o">)</span> <span class="o">{</span> <span class="k">_</span><span class="o">.</span><span class="n">resources</span><span class="o">(</span><span class="k">new</span> <span class="n">java</span><span class="o">.</span><span class="n">net</span><span class="o">.</span><span class="nc">URL</span><span class="o">(</span><span class="n">getClass</span><span class="o">().</span><span class="n">getResource</span><span class="o">(</span><span class="s">"/www/css"</span><span class="o">),</span> <span class="s">"."</span><span class="o">))</span> <span class="o">}</span>
</span><span class='line'> <span class="o">.</span><span class="n">filter</span><span class="o">(</span><span class="k">new</span> <span class="nc">KApp</span> <span class="k">with</span> <span class="nc">InMemoryKinoFixtureService</span> <span class="k">with</span> <span class="nc">InMemoryKplanerCreationService</span><span class="o">).</span><span class="n">run</span><span class="o">({</span> <span class="n">svr</span> <span class="k">=></span>
</span><span class='line'> <span class="o">{</span>
</span><span class='line'> <span class="n">unfiltered</span><span class="o">.</span><span class="n">util</span><span class="o">.</span><span class="nc">Browser</span><span class="o">.</span><span class="n">open</span><span class="o">(</span><span class="n">http</span><span class="o">.</span><span class="n">url</span><span class="o">)</span>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'> <span class="o">},</span> <span class="o">{</span> <span class="n">svr</span> <span class="k">=></span>
</span><span class='line'> <span class="n">println</span><span class="o">(</span><span class="s">"shutting down server"</span><span class="o">)</span>
</span><span class='line'> <span class="o">})</span>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'><span class="o">}</span>
</span></code></pre></td></tr></table></div></figure>
<p>Un des avantages de Scala, est la possibilité de mettre du code xml/html inline sans passer par des strings comme le montre l’exemple suivant :</p>
<figure class='code'><figcaption><span>formulaire de création d’un nouveau doodle</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
</pre></td><td class='code'><pre><code class='scala'><span class='line'><span class="k">case</span> <span class="nc">GET</span><span class="o">(</span><span class="nc">Path</span><span class="o">(</span><span class="s">"/newdoodle"</span><span class="o">))</span> <span class="k">=></span> <span class="nc">Ok</span> <span class="o">~></span> <span class="nc">HtmlContent</span> <span class="o">~></span> <span class="nc">Html</span><span class="o">(</span>
</span><span class='line'> <span class="o"><</span><span class="n">html</span><span class="o">><</span><span class="n">body</span><span class="o">><</span><span class="n">form</span> <span class="n">action</span><span class="o">=</span><span class="s">"/kplaner"</span> <span class="n">method</span><span class="o">=</span><span class="s">"POST"</span><span class="o">></span>
</span><span class='line'> <span class="o"><</span><span class="n">input</span> <span class="n">type</span><span class="o">=</span><span class="s">"text"</span> <span class="n">name</span><span class="o">=</span><span class="s">"kinoid"</span><span class="o">/></span>
</span><span class='line'> <span class="o"><</span><span class="n">input</span> <span class="n">type</span><span class="o">=</span><span class="s">"text"</span> <span class="n">name</span><span class="o">=</span><span class="s">"date"</span><span class="o">/></span>
</span><span class='line'> <span class="o"><</span><span class="n">input</span> <span class="n">type</span><span class="o">=</span><span class="s">"submit"</span><span class="o">/></span>
</span><span class='line'> <span class="o"></</span><span class="n">form</span><span class="o">></</span><span class="n">body</span><span class="o">></</span><span class="n">html</span><span class="o">></span>
</span><span class='line'> <span class="o">)</span>
</span></code></pre></td></tr></table></div></figure>
<h3>Notre production</h3>
<p>Après quelques petits problèmes de configurations d’environnement (n’est-ce pas <a href="http://twitter.com/nivdul">@nivdul</a> :D), on est rentré dans le code.</p>
<p>Nous avons identifié 3 améliorations du squelette :</p>
<ul>
<li>ajout d’un nouveau doodle (correspondant à un cinéma et une date) à l’aide d’un formulaire.</li>
</ul>
<p>Aperçu du service de sauvegarde in memory des nouveaux doodles créés:</p>
<figure class='code'><figcaption><span>enregistrement des nouveaux doodles in memory</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
<span class='line-number'>11</span>
</pre></td><td class='code'><pre><code class='scala'><span class='line'><span class="k">trait</span> <span class="nc">InMemoryKplanerCreationService</span> <span class="k">extends</span> <span class="nc">KPlanerCreationService</span> <span class="o">{</span>
</span><span class='line'> <span class="k">lazy</span> <span class="k">val</span> <span class="n">kplanerMap</span> <span class="k">=</span> <span class="k">new</span> <span class="n">collection</span><span class="o">.</span><span class="n">mutable</span><span class="o">.</span><span class="nc">HashMap</span><span class="o">[</span><span class="kt">String</span>, <span class="kt">Kplaner</span><span class="o">]()</span>
</span><span class='line'>
</span><span class='line'> <span class="k">def</span> <span class="n">newKplaner</span><span class="o">(</span><span class="n">kino</span><span class="k">:</span> <span class="kt">Kino</span><span class="o">,</span> <span class="n">date</span><span class="k">:</span> <span class="kt">DateTime</span><span class="o">)</span> <span class="k">=</span> <span class="o">{</span>
</span><span class='line'> <span class="k">val</span> <span class="n">uid</span> <span class="k">=</span> <span class="nc">UUID</span><span class="o">.</span><span class="n">randomUUID</span><span class="o">().</span><span class="n">toString</span>
</span><span class='line'> <span class="k">val</span> <span class="n">kplaner</span> <span class="k">=</span> <span class="nc">Kplaner</span><span class="o">(</span><span class="n">uid</span><span class="o">,</span> <span class="n">kino</span><span class="o">,</span> <span class="n">date</span><span class="o">,</span> <span class="nc">Set</span><span class="o">.</span><span class="n">empty</span><span class="o">)</span>
</span><span class='line'> <span class="n">kplanerMap</span> <span class="o">+=</span> <span class="n">uid</span> <span class="o">-></span> <span class="n">kplaner</span>
</span><span class='line'> <span class="n">kplaner</span>
</span><span class='line'> <span class="o">}</span>
</span><span class='line'><span class="err">…</span>
</span><span class='line'><span class="o">}</span>
</span></code></pre></td></tr></table></div></figure>
<ul>
<li>affichage d’une liste filtrée sur un cinéma et une date dans un intervalle de 2h.</li>
</ul>
<figure class='code'><figcaption><span>filtre de la liste des cinémas</span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class='scala'><span class='line'><span class="k">case</span> <span class="nc">GET</span><span class="o">(</span><span class="nc">Path</span><span class="o">(</span><span class="nc">Seg</span><span class="o">(</span><span class="s">"sessions"</span> <span class="o">::</span> <span class="n">timestamp</span> <span class="o">::</span> <span class="nc">Nil</span><span class="o">)))</span> <span class="k">=></span> <span class="n">jsonResponse</span><span class="o">(</span><span class="n">listShowing</span><span class="o">().</span><span class="n">filter</span><span class="o">(</span><span class="n">x</span> <span class="k">=></span>
</span><span class='line'> <span class="o">{</span>
</span><span class='line'>
</span><span class='line'> <span class="k">val</span> <span class="n">showingTimestamp</span> <span class="k">=</span> <span class="n">x</span><span class="o">.</span><span class="n">datetime</span><span class="o">.</span><span class="n">toDate</span><span class="o">.</span><span class="n">getTime</span>
</span><span class='line'> <span class="n">x</span><span class="o">.</span><span class="n">datetime</span><span class="o">.</span><span class="n">toDate</span><span class="o">.</span><span class="n">getTime</span> <span class="o">></span> <span class="n">timestamp</span><span class="o">.</span><span class="n">toLong</span> <span class="o">-</span> <span class="nc">ONE_HOUR</span> <span class="o">&&</span> <span class="n">showingTimestamp</span> <span class="o"><</span> <span class="n">timestamp</span><span class="o">.</span><span class="n">toLong</span> <span class="o">+</span> <span class="nc">ONE_HOUR</span>
</span><span class='line'> <span class="o">}</span>
</span></code></pre></td></tr></table></div></figure>
<ul>
<li>ajout d’une vue de vote pour le film de son choix.</li>
</ul>
<p>Par manque de temps, on n’a pas fait le lien entre le formulaire de vote du choix du film d’un doodle et la partie API serveur, mais on y était proche.</p>
<h3>Bonus</h3>
<p>Premier soucis au niveau des dates: comment gérer une date sur différentes UI?
Un très bon article (<a href="http://blog.eklaweb.com/2012/08/28/gestion-des-dates-en-informatique/">http://blog.eklaweb.com/2012/08/28/gestion-des-dates-en-informatique/</a>) traite ce sujet d’ailleurs. Après plusieurs échanges au seins de l’équipe, il apparaît qu’il est plus simple de passer par des timestamp (nombre de (milli)secondes depuis le 1er Jan 1970) pour les transferts et d’utiliser l’API Joda Time côté Java/Scala.</p>
<p>Pour faciliter les tests*, à noter que les 2 extensions chrome JSONView et Advanced REST client sont assez simple d’utilisation et ont un rendu plutôt sympa.</p>
<p>* Penser à pointer sur le bon serveur ;) cc <a href="http://twitter.com/mchataigner">@mchataigner</a></p>
<p>Enfin pour la partie Web, il aurait été intéressant de rajouter un ‘datepicker’ pour faciliter l’entrée de la date à l’utilisateur, car trouver le datetime de tête… nous on sait pas faire.</p>
<h2>Conclusion</h2>
<!--
##Ludwine
La soirée a été très intéressante en terme de développement, puisque j’ai appris à implémenter des services REST grâce à Unfiltered. J’ai également pu constater qu’il était assez simple de gérer des formulaires html en scala. Enfin, cette soirée m’a vraiment donné envie de participer à un hackathon.
##Mathieu
-->
<p>C’était une expérience sympa. Du coup, j’ai envie d’aller au hackathon AngelHack. Cependant, je ne suis pas sûr d’être au niveau pour shipper les features assez rapidement pour gagner, je ne suis pas encore fluide en Scala. Mais rappelons-le, l’essentiel c’est de participer. Et puis on a jusqu’au 30 novembre pour s’entraîner.</p>
<p>Merci à <a href="http://twitter.com/nivdul">@nivdul</a> pour avoir co-rédigé cet article.</p>
<p>Et toi, viendras-tu au AngelHack?</p>
]]></content>
</entry>
</feed>