Creating simple Symfony2 service

I am not talking about web services, but I am talking about symfony2 service container and the way of basic creating services inside Symfony2 project that are accessible from all other bundles via service container.

Why do I need to make some part of code like service inside Symfony2 anyway?

There is one possible problem:

When I started my project, I started with administrator area of application for handling CRUD operations. But this bundle is just for administrators of application. On the other side, I have to provide REST web service API that will be consumed by various devices (iPhone, Android, …).
I don’t want to put together my code for administrators and web services API code. So, after AdminBundle was finished, I decided to make another bundle inside project that will be ‘public’ side bundle and called it: ApiBundle. Inside this I will provide data that is entered and organized inside Admin area of application with REST based API .

For API, I also need same Entities used inside Admin Bundle that will handle database layer for web services too.

If I try to use  my entities that currently are inside AdminBundle from API bundle it doesn’t sounds logically to me. What if I want to separate API bundle from Admin Bundle in the future. How will I then use my entities in both? Duplicate them? I don’t think so!

For purposes like this, it’s better to create one more, separate Bundle that I called ‘CoreBundle’ that will hold all shared classes and also my entity classes for both: AdminBundle and ApiBundle.

Accessing those classes from AdminBundle and also ApiBundle I want to be via service container, so all of these methods are separated and public available for using in other bundles.

Because of that, I want to build simple Symfony2 services: one for AdminBundle and second for ApiBundle – to separate application logic.

Inside CoreBundle, I made folder called ‘Services’ and inside I put two files: Admin.php and Api.php.

Inside CoreBundle\Resources\config I made some changes to the file called ‘services.xml’:

<?xml version="1.0" ?>
 
<container xmlns="http://symfony.com/schema/dic/services"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
 
  <parameters>
     <parameter key="surgeworks_core.admin.class">Surgeworks\CoreBundle\Services\Admin</parameter>
     <parameter key="surgeworks_core.api.class">Surgeworks\CoreBundle\Services\Api</parameter>
  </parameters>
 
  <services>
     <service id="surgeworks_core.admin">
        <argument type="service" id="service_container" />
     </service>
     <service id="surgeworks_core.api">
        <argument type="service" id="service_container" />
     </service>
  </services>
</container>

//...
 
<?php
// Surgeworks\CoreBundle\DependencyInjection\Configuration.php
namespace Surgeworks\CoreBundle\DependencyInjection;
 
use Symfony\Component\Config\Definition\Builder\TreeBuilder;
use Symfony\Component\Config\Definition\ConfigurationInterface;
 
/**
* This is the class that validates and merges configuration from your app/config files
*
* To learn more see {@link http://symfony.com/doc/current/cookbook/bundles/extension.html#cookbook-bundles-extension-config-class}
*/
class Configuration implements ConfigurationInterface
{
/**
* {@inheritDoc}
*/
public function getConfigTreeBuilder()
 {
   $treeBuilder = new TreeBuilder();
   $rootNode = $treeBuilder->root('surgeworks_core');
 
// Here you should define the parameters that are allowed to
// configure your bundle. See the documentation linked above for
// more information on that topic.
 
   return $treeBuilder;
 }
}
 
//...

I just have to write my own functions inside mentioned Admin.php and Api.php and call them via service container from amy bundle’s controller:

//some controller
public function testAction()
{
   $statusesCount = $this->get('surgeworks_core.admin')-> Statuses_getCount();
}

And function inside Admin.php:

public function Statuses_getCount() {
   $repository = $this->getEm()->getRepository('Surgeworks\CoreBundle\Entity\Status');
   $statusesCount = $repository->getStatusesCount();
   return $statusesCount;
}