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Simplified usage description
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‎contributing/code/bc.rst

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Our Backwards Compatibility Promise
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===================================
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As of Symfony 2.3, we promise you backwards compatibility for all further 2.x
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releases. Ensuring smooth upgrades of your projects is our first priority.
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As of Symfony 2.3, we promise you backwards compatibility (BC) for all further
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2.x releases. Ensuring smooth upgrades of your projects is our first priority.
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However, backwards compatibility comes in many different flavors.
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This page has two different target audiences: If you are using Symfony, it will
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Using Our Interfaces
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~~~~~~~~~~~~~~~~~~~~
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Normal Interfaces
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.................
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In Symfony, we distinguish between regular and API interfaces. API interfaces
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are marked with an ``@api`` tag in their source code. For example::
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All interfaces in the ``Symfony`` namespace are **safe for use**. That means
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that:
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/**
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* HttpKernelInterface handles a Request to convert it to a Response.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*
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* @api
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*/
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interface HttpKernelInterface
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{
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* You can type hint against the interface.
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* You can call any of the methods provided by the interface.
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However:
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* You cannot implement the interface. The interface may change, but all changes
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will be documented in the UPGRADE file.
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API Interfaces
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..............
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All interfaces tagged with ``@api`` are also **safe for implementation**. That
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means that:
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* You can implement the interface.
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Internal Interfaces
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...................
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Interfaces or interface methods tagged with ``@internal`` are meant for internal
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use in Symfony only. You should never use nor implement them.
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Deprecated Interfaces
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.....................
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Interfaces or interface methods tagged with ``@deprecated`` will be removed in
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a future Symfony version. You should never use nor implement them.
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Guarantee Details
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.................
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When using our interfaces, we guarantee full backwards compatibility for the
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When using these interfaces, we guarantee full backwards compatibility for the
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following use cases:
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============================================== ============== ==============
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Use Case Normal API
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Use Case Regular API
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============================================== ============== ==============
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Type hint against Yes Yes
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Call method Yes Yes
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Add parameter default value Yes Yes
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============================================== ============== ==============
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If you need to do any of the things marked with "No" above, feel free to
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ask us whether the ``@api`` tag can be added on the respective Symfony code.
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For that, simply open a `new ticket on GitHub`_.
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Using Our Classes
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~~~~~~~~~~~~~~~~~
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Normal Classes
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..............
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All classes in the ``Symfony`` namespace are **safe for use**. That means that:
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* You can type hint against the class' name.
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* You can create new instances.
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* You can extend the class.
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* You can access public properties.
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* You can call public methods.
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When extending the class:
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* You can override public properties.
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However:
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* You cannot override methods in extending classes. The class may change, but
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all changes will be documented in the UPGRADE file.
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API Classes
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...........
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All classes tagged with ``@api`` are also **safe for extension**. That means
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that:
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* You can access protected properties and methods.
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* You can call protected methods.
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* You can override protected properties.
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* You can override public and protected methods.
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Properties and methods tagged with ``@api`` are treated as if they belonged
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to an API class. That means that you can call or override them regardless of
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whether their class has the ``@api`` tag or not.
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Internal Classes
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................
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Classes, properties and methods tagged with ``@internal`` are meant for internal
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use in Symfony only. You should never use nor extend them.
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Deprecated Classes
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..................
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.. note::
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Classes, properties and methods tagged with ``@deprecated`` will be removed in
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a future Symfony version. You should never use nor extend them.
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If you need to do any of the things marked with "No" above, feel free to
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ask us whether the ``@api`` tag can be added on the respective Symfony code.
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For that, simply open a `new ticket on GitHub`_.
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Interfaces or interface methods tagged with ``@internal`` should never be
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implemented or used.
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Test Classes
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............
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All classes located in the various ``*\\Tests\\`` namespaces are meant for
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internal use only. You should never create, extend or call them directly.
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Using Our Classes
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~~~~~~~~~~~~~~~~~
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Just like with interfaces, we also distinguish between regular and API classes.
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Like API interfaces, API classes are marked with an ``@api`` tag::
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Guarantee Details
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.................
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/**
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* Request represents an HTTP request.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*
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* @api
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*/
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class Request
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{
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When using our classes, we guarantee full backwards compatibility for the
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When using these classes, we guarantee full backwards compatibility for the
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following use cases:
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============================================== ============== ==============
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Use Case Normal API
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Use Case Regular API
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============================================== ============== ==============
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Type hint against Yes Yes
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Create instance Yes Yes
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Add parameter default value Yes Yes
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============================================== ============== ==============
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If you need to do any of the things marked with "No" above, feel free to
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ask us whether the ``@api`` tag can be added on the respective Symfony code.
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For that, simply open a `new ticket on GitHub`_.
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.. note::
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If you need to do any of the things marked with "No" above, feel free to
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ask us whether the ``@api`` tag can be added on the respective Symfony code.
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For that, simply open a `new ticket on GitHub`_.
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In some cases, only specific properties and methods are tagged with the ``@api``
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tag, even though their class is not. In these cases, we guarantee full backwards
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compatibility for the tagged properties and methods (as indicated in the column
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"API" above), but not for the rest of the class.
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Classes, properties and methods tagged with ``@internal`` should never be
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created, extended or called directly. The same applies to all classes located in
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the various ``*\\Tests\\`` namespaces.
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Working on Symfony Code
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Symfony's interfaces:
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============================================== ============== ==============
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Type of Change Normal API
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Type of Change Regular API
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============================================== ============== ==============
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Remove entirely No No
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Change name or namespace No No
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Symfony's classes:
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================================================== ============== ==============
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Type of Change Normal API
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Type of Change Regular API
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================================================== ============== ==============
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Remove entirely No No
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Make final Yes [2]_ No

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