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""" Implements a fully blocking kernel manager.
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Useful for test suites and blocking terminal interfaces.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2012 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING.txt, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from __future__ import print_function
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# Standard library imports.
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import Queue
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from threading import Event
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# Local imports.
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from IPython.utils.traitlets import Type
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from kernelmanager import InProcessKernelManager, ShellInProcessChannel, \
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SubInProcessChannel, StdInInProcessChannel
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#-----------------------------------------------------------------------------
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# Utility classes
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#-----------------------------------------------------------------------------
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class BlockingChannelMixin(object):
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def __init__(self, *args, **kwds):
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super(BlockingChannelMixin, self).__init__(*args, **kwds)
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self._in_queue = Queue.Queue()
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def call_handlers(self, msg):
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self._in_queue.put(msg)
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def get_msg(self, block=True, timeout=None):
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""" Gets a message if there is one that is ready. """
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return self._in_queue.get(block, timeout)
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def get_msgs(self):
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""" Get all messages that are currently ready. """
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msgs = []
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while True:
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try:
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msgs.append(self.get_msg(block=False))
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except Queue.Empty:
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break
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return msgs
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def msg_ready(self):
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""" Is there a message that has been received? """
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return not self._in_queue.empty()
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#-----------------------------------------------------------------------------
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# Blocking kernel manager
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#-----------------------------------------------------------------------------
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class BlockingShellInProcessChannel(BlockingChannelMixin, ShellInProcessChannel):
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pass
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class BlockingSubInProcessChannel(BlockingChannelMixin, SubInProcessChannel):
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pass
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class BlockingStdInInProcessChannel(BlockingChannelMixin, StdInInProcessChannel):
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pass
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class BlockingInProcessKernelManager(InProcessKernelManager):
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# The classes to use for the various channels.
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shell_channel_class = Type(BlockingShellInProcessChannel)
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sub_channel_class = Type(BlockingSubInProcessChannel)
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stdin_channel_class = Type(BlockingStdInInProcessChannel)
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