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Symfony Dependency Injection in Practice (Denis Malavsky, Grossum)
Symfony Dependency Injection in Practice
(Denis Malavsky, Grossum)
WHAT IS DEPENDENCY INJECTION
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Dependency injection is a software design pattern in which one or more dependencies (or services) are injected, or passed by reference, into a dependent object (or client) and are made part of the client's state. The pattern separates the creation of a client's dependencies from its own behavior, which allows program designs to be loosely coupled and to follow the dependency inversion and single responsibility principles.
It directly contrasts with the service locator pattern, which allows clients to know about the system they use to find dependencies
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SETTING UP THE CONTAINER with Configuration Files
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TYPES OF INJECTION
• Constructor Injection
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TYPES OF INJECTION
• Setter Injection
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TYPES OF INJECTION
• Property Injection
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INTRODUCTION TO PARAMETERS
• Parameters in Configuration Files • Array Parameters • Constants as Parameters • PHP Keywords in XML
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WORKING WITH CONTAINER SERVICE DEFINITIONS
• Getting and Setting Service Definitions:
• Class
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$container->hasDefinition($serviceId); $container->getDefinition($serviceId); $container->findDefinition($serviceId); $container->setDefinition($id, $definition);
$definition->getClass(); $definition->setClass($class); // Fully qualified class name as string
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WORKING WITH CONTAINER SERVICE DEFINITIONS
• Constructor Arguments
• Method Calls
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$definition->getArguments(); $definition->getArgument($index); $definition->addArgument($argument); $definition->replaceArgument($index, $argument); $definition->setArguments($arguments);
$definition->getMethodCalls(); $definition->addMethodCall($method, $arguments); $definition->setMethodCalls($methodCalls);
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MANAGING CONFIGURATION WITH EXTENSIONS
• Let’s take a look at the code.
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CREATING A COMPILER PASS
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CONTROLLING THE PASS ORDERING
• PassConfig::TYPE_BEFORE_OPTIMIZATION • PassConfig::TYPE_OPTIMIZE • PassConfig::TYPE_BEFORE_REMOVING • PassConfig::TYPE_REMOVE • PassConfig::TYPE_AFTER_REMOVING
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WORKING WITH TAGGED SERVICES
• Define Services with a custom Tag
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WORKING WITH TAGGED SERVICES
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WORKING WITH TAGGED SERVICES
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WORKING WITH TAGGED SERVICES
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USING A FACTORY TO CREATE SERVICES
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USING A FACTORY TO CREATE SERVICES
• Passing Arguments to the Factory Method
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MANAGING COMMON DEPENDENCIES WITH PARENT SERVICES
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MANAGING COMMON DEPENDENCIES WITH PARENT SERVICES
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MANAGING COMMON DEPENDENCIES WITH PARENT SERVICES
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ADVANCED CONTAINER CONFIGURATION
• Marking Services as public / private
• Aliasing
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ADVANCED CONTAINER CONFIGURATION
• Requiring Files
• Decorating Services
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THANKS! DENIS MALAVSKY Company: Grossum Phone: +38 (063) 478-2449 E-mail: [email protected] Skype: malavskuy
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