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<h1 class="epydoc">Module registry</h1><p class="nomargin-top"><span class="codelink"><a href="logilab.common.registry-pysrc.html">source&nbsp;code</a></span></p>
<pre class="literalblock">
This module provides bases for predicates dispatching (the pattern in use
here is similar to what's refered as multi-dispatch or predicate-dispatch in the
literature, though a bit different since the idea is to select across different
implementation 'e.g. classes), not to dispatch a message to a function or
method. It contains the following classes:

* :class:`RegistryStore`, the top level object which loads implementation
  objects and stores them into registries. You'll usually use it to access
  registries and their contained objects;

* :class:`Registry`, the base class which contains objects semantically grouped
  (for instance, sharing a same API, hence the 'implementation' name). You'll
  use it to select the proper implementation according to a context. Notice you
  may use registries on their own without using the store.

.. Note::

  implementation objects are usually designed to be accessed through the
  registry and not by direct instantiation, besides to use it as base classe.

The selection procedure is delegated to a selector, which is responsible for
scoring the object according to some context. At the end of the selection, if an
implementation has been found, an instance of this class is returned. A selector
is built from one or more predicates combined together using AND, OR, NOT
operators (actually `&amp;`, `|` and `~`). You'll thus find some base classes to
build predicates:

* :class:`Predicate`, the abstract base predicate class

* :class:`AndPredicate`, :class:`OrPredicate`, :class:`NotPredicate`, which you
  shouldn't have to use directly. You'll use `&amp;`, `|` and '~' operators between
  predicates directly

* :func:`objectify_predicate`

You'll eventually find one concrete predicate: :class:`yes`

.. autoclass:: RegistryStore
.. autoclass:: Registry

Predicates
----------
.. autoclass:: Predicate
.. autofunction:: objectify_predicate
.. autoclass:: yes
.. autoclass:: AndPredicate
.. autoclass:: OrPredicate
.. autoclass:: NotPredicate

Debugging
---------
.. autoclass:: traced_selection

Exceptions
----------
.. autoclass:: RegistryException
.. autoclass:: RegistryNotFound
.. autoclass:: ObjectNotFound
.. autoclass:: NoSelectableObject

</pre>

<!-- ==================== CLASSES ==================== -->
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        <a href="logilab.common.registry.RegistryException-class.html" class="summary-name">RegistryException</a><br />
      Base class for registry exception.
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      <span class="summary-type">&nbsp;</span>
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        <a href="logilab.common.registry.RegistryNotFound-class.html" class="summary-name">RegistryNotFound</a><br />
      Raised when an unknown registry is requested.
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      <span class="summary-type">&nbsp;</span>
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      Raised when an unregistered object is requested.
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      Raised when no object is selectable for a given context.
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      <span class="summary-type">&nbsp;</span>
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        <a href="logilab.common.registry.SelectAmbiguity-class.html" class="summary-name">SelectAmbiguity</a><br />
      Raised when several objects compete at selection time with an equal
score.
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      <span class="summary-type">&nbsp;</span>
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        <a href="logilab.common.registry.RegistrableObject-class.html" class="summary-name">RegistrableObject</a><br />
      This is the base class for registrable objects which are selected
according to a context.
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
        <a href="logilab.common.registry.RegistrableInstance-class.html" class="summary-name">RegistrableInstance</a><br />
      Inherit this class if you want instances of the classes to be
automatically registered.
    </td>
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      <span class="summary-type">&nbsp;</span>
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        <a href="logilab.common.registry.Registry-class.html" class="summary-name">Registry</a><br />
      The registry store a set of implementations associated to identifier:
    </td>
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
        <a href="logilab.common.registry.RegistryStore-class.html" class="summary-name">RegistryStore</a><br />
      This class is responsible for loading objects and storing them
in their registry which is created on the fly as needed.
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      <span class="summary-type">&nbsp;</span>
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        <a href="logilab.common.registry.traced_selection-class.html" class="summary-name">traced_selection</a><br />
      Typical usage is :
    </td>
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      <span class="summary-type">&nbsp;</span>
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        <a href="logilab.common.registry.PredicateMetaClass-class.html" class="summary-name">PredicateMetaClass</a>
    </td>
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
        <a href="logilab.common.registry.Predicate-class.html" class="summary-name">Predicate</a><br />
      base class for selector classes providing implementation
for operators ``&amp;``, ``|`` and  ``~``
    </td>
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    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
        <a href="logilab.common.registry.MultiPredicate-class.html" class="summary-name">MultiPredicate</a><br />
      base class for compound selector classes
    </td>
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      <span class="summary-type">&nbsp;</span>
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        <a href="logilab.common.registry.AndPredicate-class.html" class="summary-name">AndPredicate</a><br />
      and-chained selectors
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      <span class="summary-type">&nbsp;</span>
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        <a href="logilab.common.registry.OrPredicate-class.html" class="summary-name">OrPredicate</a><br />
      or-chained selectors
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
        <a href="logilab.common.registry.NotPredicate-class.html" class="summary-name">NotPredicate</a><br />
      negation selector
    </td>
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    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
        <a href="logilab.common.registry.yes-class.html" class="summary-name">yes</a><br />
      Return the score given as parameter, with a default score of 0.5 so any
other selector take precedence.
    </td>
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          <td><span class="summary-sig"><a name="obj_registries"></a><span class="summary-sig-name">obj_registries</span>(<span class="summary-sig-arg">cls</span>,
        <span class="summary-sig-arg">registryname</span>=<span class="summary-sig-default">None</span>)</span><br />
      return a tuple of registry names (see __registries__)</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="logilab.common.registry-pysrc.html#obj_registries">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a href="logilab.common.registry-module.html#objectify_predicate" class="summary-sig-name">objectify_predicate</a>(<span class="summary-sig-arg">selector_func</span>)</span><br />
      Most of the time, a simple score function is enough to build a selector.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="logilab.common.registry-pysrc.html#objectify_predicate">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a href="logilab.common.registry-module.html#class_registries" class="summary-sig-name">class_registries</a>(<span class="summary-sig-arg">cls</span>,
        <span class="summary-sig-arg">registryname</span>)</span></td>
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            <span class="codelink"><a href="logilab.common.registry-pysrc.html#class_registries">source&nbsp;code</a></span>
            
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
        <a name="TRACED_OIDS"></a><span class="summary-name">TRACED_OIDS</span> = <code title="None">None</code><br />
      hash(x)
    </td>
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<!-- ==================== FUNCTION DETAILS ==================== -->
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<a name="objectify_predicate"></a>
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  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">objectify_predicate</span>(<span class="sig-arg">selector_func</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="logilab.common.registry-pysrc.html#objectify_predicate">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <pre class="literalblock">
Most of the time, a simple score function is enough to build a selector.
The :func:`objectify_predicate` decorator turn it into a proper selector
class::

    @objectify_predicate
    def one(cls, req, rset=None, **kwargs):
        return 1

    class MyView(View):
        __select__ = View.__select__ &amp; one()

</pre>
  <dl class="fields">
  </dl>
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<a name="classid"></a>
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  <h3 class="epydoc"><span class="sig"><span class="sig-name">classid</span>(<span class="sig-arg">cls</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="logilab.common.registry-pysrc.html#classid">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  
  <dl class="fields">
    <dt>Decorators:</dt>
    <dd><ul class="nomargin-top">
        <li><code>@deprecated('[lgc 0.59] use Registry.objid class method instead')</code></li>
    </ul></dd>
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  <h3 class="epydoc"><span class="sig"><span class="sig-name">class_registries</span>(<span class="sig-arg">cls</span>,
        <span class="sig-arg">registryname</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="logilab.common.registry-pysrc.html#class_registries">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  
  <dl class="fields">
    <dt>Decorators:</dt>
    <dd><ul class="nomargin-top">
        <li><code>@deprecated('[lgc 0.59] use obj_registries function instead')</code></li>
    </ul></dd>
  </dl>
</td></tr></table>
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