Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/galaxy/util/lazy_process.py @ 4:79f47841a781 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
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1 import subprocess
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2 import threading
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3 import time
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4
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5
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6 class LazyProcess(object):
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7 """ Abstraction describing a command line launching a service - probably
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8 as needed as functionality is accessed in Galaxy.
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9 """
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10
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11 def __init__(self, command_and_args):
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12 self.command_and_args = command_and_args
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13 self.thread_lock = threading.Lock()
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14 self.allow_process_request = True
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15 self.process = None
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16
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17 def start_process(self):
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18 with self.thread_lock:
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19 if self.allow_process_request:
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20 self.allow_process_request = False
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21 t = threading.Thread(target=self.__start)
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22 t.daemon = True
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23 t.start()
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24
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25 def __start(self):
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26 with self.thread_lock:
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27 self.process = subprocess.Popen(self.command_and_args, close_fds=True)
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28
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29 def shutdown(self):
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30 with self.thread_lock:
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31 self.allow_process_request = False
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32 if self.running:
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33 self.process.terminate()
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34 time.sleep(.01)
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35 if self.running:
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36 self.process.kill()
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37
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38 @property
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39 def running(self):
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40 return self.process and not self.process.poll()
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41
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42
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43 class NoOpLazyProcess(object):
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44 """ LazyProcess abstraction meant to describe potentially optional
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45 services, in those cases where one is not configured or valid, this
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46 class can be used in place of LazyProcess.
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47 """
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48
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49 def start_process(self):
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50 return
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51
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52 def shutdown(self):
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53 return
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54
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55 @property
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56 def running(self):
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57 return False