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48 lines
1.4 KiB
ReStructuredText
48 lines
1.4 KiB
ReStructuredText
Structure of Dependency Injector
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.. meta::
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:keywords: Python,DI,Dependency injection,IoC,Inversion of Control
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:description: This article describes "Dependency Injector" framework
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components and their interaction between each other.
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Providers and containers are the former components of
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the framework.
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Current section describes *Dependency Injector* main entities and their
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interaction between each other.
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.. image:: /images/internals.png
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:width: 100%
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:align: center
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There are 2 main entities: providers & containers.
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Providers
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~~~~~~~~~
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Providers are strategies of accessing objects. For example,
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:py:class:`dependency_injector.providers.Factory` creates new instance
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of provided class every time it is called.
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:py:class:`dependency_injector.providers.Singleton` creates provided
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instance once and returns it on every next call. Base class is -
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:py:class:`dependency_injector.providers.Provider`.
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Providers could be:
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+ Injected into each other.
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+ Overridden by each other.
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+ Extended.
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Containers
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~~~~~~~~~~
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Containers are collections of providers. They are used for grouping
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of providers by some principles. Base class is -
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:py:class:`dependency_injector.containers.DeclarativeContainer`.
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Containers could be:
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+ Overridden by each other.
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+ Copied from each other.
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+ Extended.
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