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# -*- test-case-name: twisted._threads.test.test_memory -*- # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ Implementation of an in-memory worker that defers execution. """ from zope.interface import implementer from . import IWorker from ._convenience import Quit NoMoreWork = object() @implementer(IWorker) class MemoryWorker: """ An L{IWorker} that queues work for later performance. @ivar _quit: a flag indicating @type _quit: L{Quit} """ def __init__(self, pending=list): """ Create a L{MemoryWorker}. """ self._quit = Quit() self._pending = pending() def do(self, work): """ Queue some work for to perform later; see L{createMemoryWorker}. @param work: The work to perform. """ self._quit.check() self._pending.append(work) def quit(self): """ Quit this worker. """ self._quit.set() self._pending.append(NoMoreWork) def createMemoryWorker(): """ Create an L{IWorker} that does nothing but defer work, to be performed later. @return: a worker that will enqueue work to perform later, and a callable that will perform one element of that work. @rtype: 2-L{tuple} of (L{IWorker}, L{callable}) """ def perform(): if not worker._pending: return False if worker._pending[0] is NoMoreWork: return False worker._pending.pop(0)() return True worker = MemoryWorker() return (worker, perform)