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Copy pathtaskQueue.py
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166 lines (124 loc) · 5.53 KB
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#!/usr/bin/python
##################
# taskQueue.py
#
# Copyright David Baddeley, 2009
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
##################
import time
import threading
CHUNKSIZE = 50
def doNix(taskQueue): #do nothing
pass
def popZero(workerN, NWorkers, NTasks): #give worker oldest task irrespective of which worker called
return 0
class TaskQueue:
def __init__(self, name, initialTasks=[], onEmpty = doNix, fTaskToPop = popZero):
#Pyro.core.ObjBase.__init__(self)
#self.name = name
self.queueID = name
self.openTasks = list(initialTasks)
self.closedTasks = []
self.tasksInProgress = []
self.onEmpty = onEmpty #function to call when queue is empty
self.fTaskToPop = fTaskToPop #function to call to decide which task to give a worker (useful if the workers need to have share information with, e.g., previous tasks as this can improve eficiency of per worker buffering of said info).
self.inProgressLock = threading.Lock()
def postTask(self,task):
self.openTasks.append(task)
#print '[%s] - Recieved new task' % self.queueID
def postTasks(self,tasks):
self.openTasks += tasks
#print '[%s] - Recieved %d new tasks' % (self.queueID, len(tasks))
def getTask(self, workerN = 0, NWorkers = 1):
"""get task from front of list, blocks"""
#print 'Task requested'
while len(self.openTasks) < 1:
time.sleep(0.01)
task = self.openTasks.pop(self.fTaskToPop(workerN, NWorkers, len(self.openTasks)))
task.queueID = self.queueID
task.initializeWorkerTimeout(time.time())
with self.inProgressLock:
self.tasksInProgress.append(task)
#print '[%s] - Task given to worker' % self.queueID
return task
def getTasks(self, workerN = 0, NWorkers = 1):
return [self.getTask(workerN, NWorkers) for i in range(min(CHUNKSIZE,len(self.openTasks)))]
def returnCompletedTask(self, taskResult):
with self.inProgressLock:
for it in self.tasksInProgress[:]:
if (it.taskID == taskResult.taskID):
self.tasksInProgress.remove(it)
self.fileResult(taskResult)
if (len(self.openTasks) + len(self.tasksInProgress)) == 0: #no more tasks
self.onEmpty(self)
def returnCompletedTasks(self, taskResults):
with self.inProgressLock:
for taskResult in taskResults:
for it in self.tasksInProgress[:]:
if (it.taskID == taskResult.taskID):
self.tasksInProgress.remove(it)
#for taskResult in taskResults:
#allow this to be over-ridden
self.fileResults(taskResults)
if (len(self.openTasks) + len(self.tasksInProgress)) == 0: #no more tasks
self.onEmpty(self)
def fileResults(self, taskResults):
#allow this to be over-ridden in derived classes to file multiple results at once
for taskResult in taskResults:
self.fileResult(taskResult)
def fileResult(self,taskResult):
self.closedTasks.append(taskResult)
def getCompletedTask(self):
if len(self.closedTasks) < 1:
return None
else:
return self.closedTasks.pop(0)
def checkTimeouts(self):
with self.inProgressLock:
curTime = time.time()
for it in self.tasksInProgress:
if 'workerTimeout' in dir(it):
if curTime > it.workerTimeout:
self.openTasks.insert(0, it)
self.tasksInProgress.remove(it)
def getNumberOpenTasks(self, exact=True):
return len(self.openTasks)
def getNumberTasksInProgress(self):
return len(self.tasksInProgress)
def getNumberTasksCompleted(self):
return len(self.closedTasks)
def cleanup(self):
pass
def purge(self):
self.openTasks = []
self.closedTasks = []
self.tasksInProgress = []
def setPopFcn(self, fcn):
""" sets the function which determines which task to give a worker"""
self.fTaskToPop = fcn
class TaskQueueWithData(TaskQueue):
def __init__(self, name, initialTasks=[], onEmpty = doNix, fTaskToPop = popZero):
TaskQueue.__init__(self, name, initialTasks, onEmpty, fTaskToPop)
self.data = {}
def getTasks(self, workerN = 0, NWorkers = 1):
return [self.getTask(workerN, NWorkers)]
def getQueueData(self, fieldName, *args):
"""Get data, defined by fieldName and potntially additional arguments, ascociated with queue"""
return self.data[fieldName]
def setQueueData(self, fieldName, value):
"""Get data, defined by fieldName and potntially additional arguments, ascociated with queue"""
self.data[fieldName] = value