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Add helpful remarks on custom DataCollector #7773

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Add helpful remarks on custom DataCollector #7773

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5f03d71
Add helpful remarks on custom DataCollector
xosofox Apr 8, 2017
9f8f97a
Merge pull request #1 from Xosofox/datacollector-remarks
xosofox Apr 8, 2017
d80da02
grammar fix
xosofox Apr 8, 2017
0617174
Updated according to remarks by @xabbuh
xosofox Apr 13, 2017
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11 changes: 11 additions & 0 deletions profiler/data_collector.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,11 @@ The
:method:`Symfony\\Component\\HttpKernel\\DataCollector\\DataCollectorInterface::collect`
method is responsible for storing the collected data in local properties.

.. caution::

The :method:`Symfony\\Component\\HttpKernel\\DataCollector\\DataCollectorInterface::collect` method is only called once.
It is not used to "gather" data but is there to "pick up" the data that has been stored by your service.

Most of the time, it is convenient to extend
:class:`Symfony\\Component\\HttpKernel\\DataCollector\\DataCollector` and
populate the ``$this->data`` property (it takes care of serializing the
Expand Down Expand Up @@ -71,6 +76,12 @@ collects the method and accepted content types from the request::

The getters are added to give the template access to the collected information.

.. caution::

If the data that is not directly related to the request or response, you need to make the data accessible to your DataCollector.
This can be achieved by injecting the service into your DataCollector.
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I think we can be a bit more specific what we mean with "the service" (something like "by injecting a service that provides this information into your data collector).



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one blank line is enough here

.. caution::

As the profiler serializes data collector instances, you should not
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