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   License:   wxWindows License

.. include:: headings.inc

.. currentmodule:: wx.lib.pubsub.core.publisherbase

.. highlight:: python



.. _wx.lib.pubsub.core.publisherbase.PublisherBase:

==========================================================================================================================================
|phoenix_title|  **wx.lib.pubsub.core.publisherbase.PublisherBase**
==========================================================================================================================================

Represent the class that send messages to listeners of given
topics and that knows how to subscribe/unsubscribe listeners
from topics.



|

|class_hierarchy| Class Hierarchy
=================================

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   Inheritance diagram for class <strong>PublisherBase</strong>:
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|method_summary| Methods Summary
================================

================================================================================= ================================================================================
:meth:`~wx.lib.pubsub.core.publisherbase.PublisherBase.__init__`                  If treeConfig is None, a default one is created from an
:meth:`~wx.lib.pubsub.core.publisherbase.PublisherBase.addNotificationHandler`    Add a handler for tracing pubsub activity. The handler should be
:meth:`~wx.lib.pubsub.core.publisherbase.PublisherBase.clearNotificationHandlers` Remove all notification handlers that were added via
:meth:`~wx.lib.pubsub.core.publisherbase.PublisherBase.getListenerExcHandler`     Get the listener exception handler that was registered
:meth:`~wx.lib.pubsub.core.publisherbase.PublisherBase.getNotificationFlags`      Return a dictionary with the notification flag states.
:meth:`~wx.lib.pubsub.core.publisherbase.PublisherBase.getTopicMgr`               Get the topic manager created for this publisher.
:meth:`~wx.lib.pubsub.core.publisherbase.PublisherBase.sendMessage`               Send a message for topic name with given data (args and kwargs).
:meth:`~wx.lib.pubsub.core.publisherbase.PublisherBase.setListenerExcHandler`     Set the function to call when a listener raises an exception
:meth:`~wx.lib.pubsub.core.publisherbase.PublisherBase.setNotificationFlags`      Set the notification flags on or off for each type of
:meth:`~wx.lib.pubsub.core.publisherbase.PublisherBase.setTopicUnspecifiedFatal`  Changes the creation policy for topics.
:meth:`~wx.lib.pubsub.core.publisherbase.PublisherBase.subscribe`                 Subscribe listener to named topic. Raises ListenerMismatchError
:meth:`~wx.lib.pubsub.core.publisherbase.PublisherBase.unsubAll`                  By default (no args given), unsubscribe all listeners from all
:meth:`~wx.lib.pubsub.core.publisherbase.PublisherBase.unsubscribe`               Unsubscribe from given topic. Returns the pubsub.core.Listener
================================================================================= ================================================================================


|


|api| Class API
===============


.. class:: PublisherBase

   Represent the class that send messages to listeners of given
   topics and that knows how to subscribe/unsubscribe listeners
   from topics.

   .. method:: __init__(self, treeConfig = None)

      If treeConfig is None, a default one is created from an
      instance of TreeConfig.


   .. method:: addNotificationHandler(self, handler)

      Add a handler for tracing pubsub activity. The handler should be
      a class that adheres to the API of INotificationHandler. 


   .. method:: clearNotificationHandlers(self)

      Remove all notification handlers that were added via
      self.addNotificationHandler(). 


   .. method:: getListenerExcHandler(self)

      Get the listener exception handler that was registered
      via setListenerExcHandler(), or None of none registered.


   .. method:: getNotificationFlags(self)

      Return a dictionary with the notification flag states.


   .. method:: getTopicMgr(self)

      Get the topic manager created for this publisher.


   .. method:: sendMessage(self, topicName, \*args, \*\*kwargs)

      Send a message for topic name with given data (args and kwargs).
      This will be overridden by derived classes that implement
      message-sending for different messaging protocols; not all
      parameters may be accepted.


   .. method:: setListenerExcHandler(self, handler)

      Set the function to call when a listener raises an exception
      during a sendMessage(). The handler must adhere to the
      IListenerExcHandler API. 


   .. method:: setNotificationFlags(self, \*\*kwargs)

      Set the notification flags on or off for each type of
      pubsub activity. The kwargs keys can be any of the following:
      
      - subscribe:    if True, get notified whenever a listener subscribes to a topic;
      - unsubscribe:  if True, get notified whenever a listener unsubscribes from a topic;
      - deadListener: if True, get notified whenever a subscribed listener has been garbage-collected;
      - sendMessage:  if True, get notified whenever sendMessage() is called;
      - newTopic:     if True, get notified whenever a new topic is created;
      - delTopic:     if True, get notified whenever a topic is "deleted" from topic tree;
      - all:          set all of the above to the given value (True or False).
      
      The kwargs that are None are left at their current value. Those that are ``False`` will cause corresponding notification to be silenced. The 'all'
      is set first, then the others. E.g.
      
          mgr.setFlagStates(all=True, delTopic=False)
      
      will toggle all notifications on, but will turn off the 'delTopic'
      notification.


   .. method:: setTopicUnspecifiedFatal(self, newVal=True, checkExisting=True)

      Changes the creation policy for topics.
      
      By default, pubsub will accept topic names for topics that
      don't have a message data specification (MDS). This default behavior
      makes pubsub easier to use initially, but allows topic
      names with typos to go uncaught in common operations such as
      sendMessage() and subscribe(). In a large application, this
      can lead to nasty bugs. Pubsub's default behavior is equivalent
      to setTopicUnspecifiedFatal(false).
      
      When called with newVal=True, any future pubsub operation that
      requires a topic (such as subscribe and sendMessage) will require
      an MDS; if none is available, pubsub will raise a TopicDefnError
      exception.
      
      If checkExisting is not given or True, all existing
      topics are validated. A TopicDefnError exception is
      raised if one is found to be incomplete (has hasMDS() false).
      
      Returns previous value of newVal.
      
      Note that this method can be used in several ways:
      
      1. Only use it in your application when something is not working
         as expected: just add a call at the beginning of your app when
         you have a problem with topic messages not being received
         (for instance), and remove it when you have fixed the problem.
      
      2. Use it from the beginning of your app and never use newVal=False:
         add a call at the beginning of your app and you leave it in
         (forever), and use Topic Definition Providers to provide the
         listener specifications. These are easy to use via the
         pub.addTopicDefnProvider().
      
      3. Use it as in #1 during app development, and once stable, use
         #2. This is easiest to do in combination with
         pub.exportTopicTreeSpec().
       


   .. method:: subscribe(self, listener, topicName)

      Subscribe listener to named topic. Raises ListenerMismatchError
      if listener isn't compatible with the topic's MDS. Returns
      (pubsub.core.Listener, success), where success is ``False`` if listener
      was already subscribed. The pub.core.Listener wraps the callable
      subscribed and provides introspection-based info about
      the callable.
      
      Note that if 'subscribe' notification is on, the handler's
      'notifySubscribe' method is called after subscription.


   .. method:: unsubAll(self, topicName = None, listenerFilter = None, topicFilter = None)

      By default (no args given), unsubscribe all listeners from all
      topics. A listenerFilter can be given so that only the listeners
      that satisfy listenerFilter(listener) == ``True`` will be unsubscribed
      (with listener being a pub.Listener wrapper instance for each listener
      subscribed). A topicFilter can also be given so that only topics
      that satisfy topicFilter(topic name) == ``True`` will be affected.
      If only one topic should have listeners unsubscribed, then a topic
      name 'topicName' can be given *instead* instead of a topic filter.
      
      Returns the list of all listeners (instances of pub.Listener) that
      were unsubscribed from the topic tree).
      
      Note: this method will generate one 'unsubcribe' notification message
      (see pub.setNotificationFlags()) for each listener unsubscribed.


   .. method:: unsubscribe(self, listener, topicName)

      Unsubscribe from given topic. Returns the pubsub.core.Listener
      instance that was used to wrap listener at subscription
      time. Raises an TopicNameError if topicName doesn't exist.
      
      Note that if 'unsubscribe' notification is on, the handler's
      notifyUnsubscribe() method will be called after unsubscribing. 


