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# parallel.controller.heartmonitor

## Module: `parallel.controller.heartmonitor`

Inheritance diagram for `IPython.parallel.controller.heartmonitor`:

A multi-heart Heartbeat system using PUB and XREP sockets. pings are sent out on the PUB, and hearts are tracked based on their XREQ identities.

Authors:

- Min RK

## Classes

### `Heart`

class `IPython.parallel.controller.heartmonitor.``Heart`(in_addr, out_addr, in_type=2, out_type=5, heart_id=None)

  Bases: `object`

  A basic heart object for responding to a HeartMonitor. This is a simple wrapper with defaults for the most common Device model for responding to heartbeats.

  It simply builds a threadsafe zmq.FORWARDER Device, defaulting to using SUB/XREQ for in/out.

  You can specify the XREQ’s IDENTITY via the optional heart_id argument.

  `__init__`(in_addr, out_addr, in_type=2, out_type=5, heart_id=None)
  `device` = None
  `id` = None
  `start`()

### `HeartMonitor`

class `IPython.parallel.controller.heartmonitor.``HeartMonitor`(**kwargs)

  Bases: `IPython.config.configurable.LoggingConfigurable`

  A basic HeartMonitor class pingstream: a PUB stream pongstream: an XREP stream period: the period of the heartbeat in milliseconds

  `__init__`(**kwargs)
  `add_heart_failure_handler`(handler)

    add a new handler for heart failure

  `add_new_heart_handler`(handler)

    add a new handler for new hearts

  `beat`()
  classmethod `class_config_section`()

    Get the config class config section

  classmethod `class_get_help`()

    Get the help string for this class in ReST format.

  classmethod `class_get_trait_help`(trait)

    Get the help string for a single trait.

  classmethod `class_print_help`()

    Get the help string for a single trait and print it.

  classmethod `class_trait_names`(**metadata)

    Get a list of all the names of this classes traits.

    This method is just like the `trait_names()` method, but is unbound.

  classmethod `class_traits`(**metadata)

    Get a list of all the traits of this class.

    This method is just like the `traits()` method, but is unbound.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

  `config`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `created` = None
  `handle_heart_failure`(heart)
  `handle_new_heart`(heart)
  `handle_pong`(msg)

    a heart just beat

  `hearts`

    An instance of a Python set.

  `last_ping`

    A casting version of the float trait.

  `lifetime`

    A casting version of the float trait.

  `log`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `loop`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `on_probation`

    An instance of a Python set.

  `on_trait_change`(handler, name=None, remove=False)

    Setup a handler to be called when a trait changes.

    This is used to setup dynamic notifications of trait changes.

    Static handlers can be created by creating methods on a HasTraits subclass with the naming convention ‘_[traitname]_changed’. Thus, to create static handler for the trait ‘a’, create the method _a_changed(self, name, old, new) (fewer arguments can be used, see below).

    Parameters :

    handler : callable

    > A callable that is called when a trait changes. Its signature can be handler(), handler(name), handler(name, new) or handler(name, old, new).

    name : list, str, None

    > If None, the handler will apply to all traits. If a list of str, handler will apply to all names in the list. If a str, the handler will apply just to that name.

    remove : bool

    > If False (the default), then install the handler. If True then unintall it.

  `period`

    A casting version of the float trait.

  `pingstream`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `pongstream`

    A trait whose value must be an instance of a specified class.

    The value can also be an instance of a subclass of the specified class.

  `responses`

    An instance of a Python set.

  `start`()
  `tic`

    A casting version of the float trait.

  `trait_metadata`(traitname, key)

    Get metadata values for trait by key.

  `trait_names`(**metadata)

    Get a list of all the names of this classes traits.

  `traits`(**metadata)

    Get a list of all the traits of this class.

    The TraitTypes returned don’t know anything about the values that the various HasTrait’s instances are holding.

    This follows the same algorithm as traits does and does not allow for any simple way of specifying merely that a metadata name exists, but has any value. This is because get_metadata returns None if a metadata key doesn’t exist.

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