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Inside the Symfony DIC and Config
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Andreas Hucks
January 25, 2013
Programming
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Inside the Symfony DIC and Config
Slides for my Symfony workshop at PHPBenelux 2013
Andreas Hucks
January 25, 2013
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Transcript
None
Symfony DIC and Configuration
Andreas Hucks @meandmymonkey Senior Developer, Trainer, Consultant SensioLabs Deutschland
The Project:
€
http://goo.gl/rS06X
Life without Dependency Injection
class Logger { public function log($message, $level =
'INFO') { $formatter = new XmlFormatter(); $log = $formatter-‐>format( $message, $level ); $this-‐>writeLog($log); } }
Problems?
class Logger { function __construct(FormatterInterface $formatter) {
$this-‐>formatter = $formatter; } [...] }
class Logger { [...] public function
log($message, $level = 'INFO') { $log = $this-‐>formatter-‐>format( $message, $level ); $this-‐>writeLog($log); } }
Alternative: Setter Injection
class Logger { [...] function setFormatter(FormatterInterface
$formatter) { $this-‐>formatter = $formatter; } [...] }
“Dependency Injection is where components are given their dependencies through
their constructors, methods, or directly into fields.”
Interfacing with the Webservice
interface ExchangeRatesInterface { /**
* @return array */ public function getRates(); /** * @param string $currency * @return float */ public function getRate($currency); }
interface AdapterInterface { /**
* @return string */ public function getRawData(); }
interface ParserInterface { /**
* @param string $rawData * @return array */ public function parse($rawData); }
Task Implement class ExchangeRates using MockAdapter and XmlParser. Generate output
using ExchangeRatesCommand .
The Service Container
The Service Container is simply a PHP object that manages
the instantiation of services.
$container-‐>get('logger'); $container-‐>getParameter('logger.class');
Vocabulary Elements
service An object managed by the Dependency Injection Container.
argument A parameter given by the DIC to a service,
via the constructor or a mutator method (setter).
parameter A configuration value.
<service id="sensio.logger" class="Sensio\Logger" > <!-‐-‐
Constructor arguments -‐-‐> <argument>/path/to/app/logs/app.log</argument> <argument type="service" id="sensio.logger.xml_formatter" /> <!-‐-‐ Methods to call -‐-‐> <call method="setDefaultSeverity"> <argument>DEBUG</argument> </call> <!-‐-‐ Tags -‐-‐> <tag name="tools.logger" /> </service>
Vocabulary Attributes
id The service identifier or name
class The service class to instantiate
alias An alias name for this service
public Set to false to make the service private and
used internally
<service id="sensio.logger" class="Sensio\Logger" > <!-‐-‐
Constructor arguments -‐-‐> <argument>/path/to/app/logs/app.log</argument> <argument type="service" id="sensio.logger.xml_formatter" /> <!-‐-‐ Methods to call -‐-‐> <call method="setDefaultSeverity"> <argument>DEBUG</argument> </call> <!-‐-‐ Tags -‐-‐> <tag name="tools.logger" /> </service>
Vocabulary Service Elements
argument An argument to pass to a method (constructor or
setter)
call A method to call on the newly created object
tag A tag to attach to the service definition
<service id="sensio.logger" class="Sensio\Logger" > <!-‐-‐
Constructor arguments -‐-‐> <argument>/path/to/app/logs/app.log</argument> <argument type="service" id="sensio.logger.xml_formatter" /> <!-‐-‐ Methods to call -‐-‐> <call method="setDefaultSeverity"> <argument>DEBUG</argument> </call> <!-‐-‐ Tags -‐-‐> <tag name="tools.logger" /> </service>
Vocabulary Argument Attributes
type Define the nature of the argument. Allowed values: string,
constant, collection or service
id The service name, if the argument is a service
key The argument key when dealing with the collection type
<service id="sensio.logger" class="Sensio\Logger" > <!-‐-‐
Constructor arguments -‐-‐> <argument>/path/to/app/logs/app.log</argument> <argument type="service" id="sensio.logger.xml_formatter" /> <!-‐-‐ Methods to call -‐-‐> <call method="setDefaultSeverity"> <argument>DEBUG</argument> </call> <!-‐-‐ Tags -‐-‐> <tag name="tools.logger" /> </service>
http://goo.gl/FNJ9H
Task Write a container configuration!
Configuration
public function load( array $configs, ContainerBuilder
$container ) { $configuration = new Configuration(); $config = $this -‐>processConfiguration($configuration, $configs); $loader = new Loader\XmlFileLoader( $container, new FileLocator(__DIR__.'/../Resources/config') ); $loader-‐>load('exchangerates.xml'); }
Array ( [0] => Array (
[exchange_rates] => Array ( [curl] => Array ( [CURLOPT_TIMEOUT] => 5 ) ) ) [1] => Array ( [exchange_rates] => Array ( [curl] => Array ( [CURLOPT_TIMEOUT] => 10, [CURLOPT_PROXY] => http:// localhost:8888 ) ) ) )
Array ( [exchange_rates] => Array (
[curl] => Array ( [CURLOPT_TIMEOUT] => 10 [CURLOPT_PROXY] => http://localhost:8888 ) [endpoint] => http://www.ecb.europa.eu/stats... ) )
class Configuration implements ConfigurationInterface { public function getConfigTreeBuilder()
{ $treeBuilder = new TreeBuilder(); $rootNode = $treeBuilder>root('acme_dic_workshop'); $rootNode -‐>children() -‐>scalarNode('some_config_var') -‐>isRequired() -‐>defaultValue('foo') -‐>end() -‐>end(); return $treeBuilder; } }
-‐>scalarNode(‘some_url') -‐>isRequired() -‐>cannotBeEmpty() -‐>validate() -‐>ifTrue(function($value)
{ return !filter_var($value, \FILTER_VALIDATE_URL); }) -‐>thenInvalid('Not a valid url.') -‐>end() -‐>end()
http://goo.gl/8sa6Q
Thanks! https://joind.in/7778