pythreadworker 0.4.0

A threading library written in python

A threading library written in python. Help you build threaded app.

This module was originally included in ComicCrawler.

Features

• Pause, resume, stop and restart thread.

• Create child thread.

• Create async task.

• Communicate between threads with events.

• Use channel to broadcast event.

Install

pip install pythreadworker

Usage

Basic

#! python3

from worker import Worker, sleep

count = None

def increaser():
        global count
        count = 1
        while True:
                print(count)
                count += 1
                sleep(1)

thread = Worker(increaser)

while True:
        command = input("input command: ")

        if command == "pause":
                thread.pause()

        if command == "resume":
                thread.resume()

        if command == "stop":
                thread.stop()

        if command == "start":
                thread.start()

        if command == "exit":
                thread.stop()
                break

Async task

#! python3

from worker import Async, sleep

def long_work(t):
        sleep(t)
        return "Finished in {} second(s)".format(t)

async = Async(long_work, 5)

# Do other stuff here...

print(async.get())

Listen to event

#! python3

from worker import Worker

def create_printer():
        thread = Worker()

        @thread.listen("PRINT")
        def _(event):
                print(event.data)

        return thread.start()

thread = create_printer()
thread.fire("PRINT", "Hello thread!")
thread.stop()

Subscribe to channel

#! python3

from worker import Worker, Channel

def create_worker():
        thread = Worker()
        @thread.listen("PRINT")
        def _(event):
                print(event.data)
        channel.sub(thread)
        return thread.start()

channel = Channel()
thread = create_worker()
channel.pub("PRINT", "Hello channel!")
thread.stop()

Child thread and bubble/broadcast

#! python3

from worker import Worker, sleep

def create_worker(name, parent):
        thread = Worker(parent=parent)
        @thread.listen("HELLO")
        def _(event):
                print(name)
        return thread.start()

parent = create_worker("parent", None)
child = create_worker("child", parent)
grand = create_worker("grand", child)

# broadcast/bubble is happened in main thread. It doesn't gaurantee the execution order of listeners.
parent.fire("HELLO", broadcast=True)
sleep(1)
grand.fire("HELLO", bubble=True)
sleep(1)

# stop a thread will cause its children to stop
parent.stop()

Notes

• Thread safe operations: http://effbot.org/pyfaq/what-kinds-of-global-value-mutation-are-thread-safe.htm

Changelog

• 0.4.0 (Apr 20, 2016)

  • Interface completely changed:

    • Drop Message.put, .get

    • Drop UserWorker

    • Drop Worker.create_child. Use parent option in constructor instead.

    • Drop global_cleanup

    • Add sleep

    • Add current

    • Add Channel

    • Add Listener.priority

    • Add daemon option to Worker

    • Worker.cleanup –> Worker.update

    • Worker.message –> Worker.fire

    • Worker.wait_message –> Worker.wait_event

    • Worker.message_loop –> Worker.wait_forever

• 0.3.0 (Jun 14, 2015)

  • Catch BaseException.