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Source code for galaxy.util.lazy_process

import subprocess
import threading
import time


[docs]class LazyProcess( object ): """ Abstraction describing a command line launching a service - probably as needed as functionality is accessed in Galaxy. """
[docs] def __init__( self, command_and_args ): self.command_and_args = command_and_args self.thread_lock = threading.Lock() self.allow_process_request = True self.process = None
[docs] def start_process( self ): with self.thread_lock: if self.allow_process_request: self.allow_process_request = False t = threading.Thread(target=self.__start) t.daemon = True t.start()
def __start(self): with self.thread_lock: self.process = subprocess.Popen( self.command_and_args, close_fds=True )
[docs] def shutdown( self ): with self.thread_lock: self.allow_process_request = False if self.running: self.process.terminate() time.sleep(.01) if self.running: self.process.kill()
@property def running( self ): return self.process and not self.process.poll()
[docs]class NoOpLazyProcess( object ): """ LazyProcess abstraction meant to describe potentially optional services, in those cases where one is not configured or valid, this class can be used in place of LazyProcess. """
[docs] def start_process( self ): return
[docs] def shutdown( self ): return
@property def running( self ): return False