# Jython issue 1761
#
# Timothy Reaves  writes:
# I run jconsole, and when I kick off my process, I see the thread count
# increase, typically by 35 threads (some are ODI's).  When the process has
# finished, and ODI finishes it's stuff, the delta is always exactly 32; it just
# keeps growing.  Eventually, the VM runs out of memory, or the ulimit is hit.

from threading import Thread
from Queue import Queue
import os, sys, time

class Worker(Thread):
    def __init__(self, tasks):
        Thread.__init__(self)
        self.tasks = tasks
        self.daemon = True
        self.start()

    def run(self):
        while True:
            func, args, kargs = self.tasks.get()
            try:
                func(*args, **kargs)
            except Exception, exception:
                logging.error(exception, extra={"sbs_app":"Worker"})
            self.tasks.task_done()

class ThreadPool:
    def __init__(self, num_threads):
        self.tasks = Queue(num_threads)
        for _ in range(num_threads):
            Worker(self.tasks)

    def add_task(self, func, *args, **kargs):
        self.tasks.put((func, args, kargs), True)

    def wait_completion(self):
        self.tasks.join()


# Client program

def job(n):
    print "Job %d started." % n
    junk = '*'*1000000
    time.sleep(2)
    print "Job %d finished." % n 

def run_test(N):
    pool = ThreadPool(32)
    
    for n in range(N):
        pool.add_task(job, n)
        
    pool.wait_completion()

# Repeatedly run pools (are threads tidied up)?
for t in range(10):
    print "================== Pool%3d ==================" % t
    run_test(100)