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61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
"""MonitoredQueue classes and functions."""
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# Copyright (C) PyZMQ Developers
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# Distributed under the terms of the Modified BSD License.
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from zmq import PUB
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from zmq.devices.monitoredqueue import monitored_queue
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from zmq.devices.proxydevice import ProcessProxy, Proxy, ProxyBase, ThreadProxy
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class MonitoredQueueBase(ProxyBase):
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"""Base class for overriding methods."""
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_in_prefix = b''
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_out_prefix = b''
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def __init__(
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self, in_type, out_type, mon_type=PUB, in_prefix=b'in', out_prefix=b'out'
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):
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ProxyBase.__init__(self, in_type=in_type, out_type=out_type, mon_type=mon_type)
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self._in_prefix = in_prefix
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self._out_prefix = out_prefix
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def run_device(self):
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ins, outs, mons = self._setup_sockets()
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monitored_queue(ins, outs, mons, self._in_prefix, self._out_prefix)
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class MonitoredQueue(MonitoredQueueBase, Proxy):
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"""Class for running monitored_queue in the background.
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See zmq.devices.Device for most of the spec. MonitoredQueue differs from Proxy,
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only in that it adds a ``prefix`` to messages sent on the monitor socket,
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with a different prefix for each direction.
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MQ also supports ROUTER on both sides, which zmq.proxy does not.
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If a message arrives on `in_sock`, it will be prefixed with `in_prefix` on the monitor socket.
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If it arrives on out_sock, it will be prefixed with `out_prefix`.
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A PUB socket is the most logical choice for the mon_socket, but it is not required.
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"""
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class ThreadMonitoredQueue(MonitoredQueueBase, ThreadProxy):
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"""Run zmq.monitored_queue in a background thread.
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See MonitoredQueue and Proxy for details.
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"""
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class ProcessMonitoredQueue(MonitoredQueueBase, ProcessProxy):
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"""Run zmq.monitored_queue in a separate process.
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See MonitoredQueue and Proxy for details.
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"""
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__all__ = ['MonitoredQueue', 'ThreadMonitoredQueue', 'ProcessMonitoredQueue']
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