#! /usr/bin/env python

import sys
import ndcctools.work_queue as wq

port_file = None
try:
    port_file = sys.argv[1]
except IndexError:
    sys.stderr.write("Usage: {} PORTFILE\n".format(sys.argv[0]))
    raise

# Define a function to invoke remotely
def my_sum(x, y, negate=False):
    import math
    f = 1
    if negate:
        f = -1
    s = f * (x + y)
    return s

# Create a new queue
queue = wq.WorkQueue(port=0)
print("listening on port {}".format(queue.port))
with open(port_file, "w") as f:
    f.write(str(queue.port))


# Submit several tasks for execution:
print("submitting tasks...")
for value in range(1,10):
    task = wq.PythonTask(my_sum, value, value)
    task.specify_cores(1)
    queue.submit(task)

# add task outputs
positive_sum = 0
while not queue.empty():
    task = queue.wait(5)
    if task:
        print("task {} completed with result {}".format(task.id,task.output))
        positive_sum += task.output


# Submit several tasks for execution:
for value in range(1,10):
    task = wq.PythonTask(my_sum, value, value, negate=True)
    task.specify_cores(1)
    queue.submit(task)

# add task outputs
negative_sum = 0
while not queue.empty():
    task = queue.wait(5)
    if task:
        print("task {} completed with result {}".format(task.id,task.output))
        negative_sum += task.output


assert(positive_sum == (-1 * negative_sum))

# vim: set sts=4 sw=4 ts=4 expandtab ft=python: