Solution for the data collector exercise

src/Acme/DemoBundle/DataCollector/SomeDataCollector.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Acme\DemoBundle\DataCollector;
+
+use Acme\DemoBundle\Services\SomeService;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\DataCollector\DataCollectorInterface;
+
+class SomeDataCollector implements DataCollectorInterface
+{
+    private $service;
+
+    public function __construct(SomeService $service)
+    {
+        $this->service = $service;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function collect(Request $request, Response $response, \Exception $exception = null)
+    {
+        $this->data = $this->service->getMessages();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'some_data_collector';
+    }
+}

src/Acme/DemoBundle/Resources/config/services.xml

@@ -16,5 +16,10 @@
         </service>
 
         <service id="acme.demo.some_service" class="Acme\DemoBundle\Services\SomeService" />
+
+        <service id="acme.demo.some_data_collector" class="Acme\DemoBundle\DataCollector\SomeDataCollector">
+            <tag name="data_collector" template="AcmeDemoBundle:Collector:messages" id="some_data_collector" />
+            <argument type="service" id="acme.demo.some_service" />
+        </service>
     </services>
 </container>

src/Acme/DemoBundle/Resources/views/Collector/messages.html.twig

@@ -0,0 +1,35 @@
+{% extends 'WebProfilerBundle:Profiler:layout.html.twig' %}
+
+{% block toolbar %}
+    {% set icon %}
+        <img width="20" height="28" alt="Some Service" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAcCAYAAABh2p9gAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAQRJREFUeNpi/P//PwM1ARMDlcGogZQDlpMnT7pxc3NbA9nhQKxOpL5rQLwJiPeBsI6Ozl+YBOOOHTv+AOllQNwtLS39F2owKYZ/gRq8G4i3ggxEToggWzvc3d2Pk+1lNL4fFAs6ODi8JzdS7mMRVyDVoAMHDsANdAPiOCC+jCQvQKqBQB/BDbwBxK5AHA3E/kB8nKJkA8TMQBwLxaBIKQbi70AvTADSBiSadwFXpCikpKQU8PDwkGTaly9fHFigkaKIJid4584dkiMFFI6jkTJII0WVmpHCAixZQEXWYhDeuXMnyLsVlEQKI45qFBQZ8eRECi4DBaAlDqle/8A48ip6gAADANdQY88Uc0oGAAAAAElFTkSuQmCC" />
+        <span class="sf-toolbar-status">{{ collector.data|length }}</span>
+    {% endset %}
+    {% set text %}
+        <div class="sf-toolbar-info-piece">{{ collector.data|length }}</div>
+    {% endset %}
+    {% include 'WebProfilerBundle:Profiler:toolbar_item.html.twig' with { 'link': profiler_url } %}
+{% endblock %}
+
+{% block head %}
+    {{ parent() }}
+{% endblock %}
+
+{% block menu %}
+    <span class="label">
+        <span class="icon"><img alt="Some Service" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABoAAAAcCAYAAAB/E6/TAAABLUlEQVR42u3TP0vDQBiA8UK/gDiLzi0IhU4OEunk5OQUAhGSOBUCzqWfIKSzX8DRySF0URCcMjWLIJjFD9Cpk/D6HITecEPUuzhIAz8CIdyTP/f2iqI4qaqqDx8l5Ic2uIeP/bquezCokOAFF+oCN3t4gPzSEjc4NEPaCldQbzjELTYW0RJzHDchwwem+ons6ZBpLSJ7nueJC22h0V+FzmwWV0ee59vQNV67CGVZJmEYbkNjfpY6X6I0Qo4/3RMmTdDDspuQVsJvgkP3IdMbIkIjLPBoadG2646iKJI0Ta2wxm6OdnP0/Tk6DYJgHcfxpw21RtscDTDDnaVZ26474GkkSRIrrPEv5sgMTfHe+cA2O6wPH6vOBpYQNALneHb96XTEDI6dzpEZ0VzO0Rf3pP5LMLI4tAAAAABJRU5ErkJggg==" /></span>
+        <strong>Some Service</strong>
+        <span class="count">
+            <span>{{ collector.data|length }}</span>
+        </span>
+    </span>
+{% endblock %}
+
+{% block panel %}
+    <h2>Some Service</h2>
+    {% for message in collector.data %}
+        <div>{{ message }}</div>
+    {% else %}
+        <p>No messages</p>
+    {% endfor %}
+{% endblock %}