JIRA issue dumper

issue_dumper.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import logging
import time
from multiprocessing import Value
from multiprocessing.pool import ThreadPool


class JiraIssueDumper(object):
    MAX_RESULTS = 50

    def __init__(self, jira):
        self.log = logging.getLogger(self.__class__.__name__)

        self._jira = jira

    def _total(self, jql_str):
        result = self._jira.search_issues(jql_str=jql_str, maxResults=1)
        return result.total

    def collect(self, jql_str, fields=None, expand=None, callback=None):
        total = self._total(jql_str)
        start_intervals = range(0, total, self.MAX_RESULTS)
        self.log.info(
            "Total {total} issues are going to be requested by '{jql_str}' query."
                .format(total=total, jql_str=jql_str)
        )

        counter = Value('i', 0)
        shown = set()

        def _exec_(start):
            result = self._jira.search_issues(
                jql_str=jql_str, 
                startAt=start,
                maxResults=self.MAX_RESULTS,
                fields=fields, 
                expand=expand
            )

            counter.value += len(result)
            done_percent = float(counter.value * 100) / total
            int_percent = int(done_percent)

            if int_percent % 5 == 0 and int_percent not in shown:
                self.log.info("Progress: {done}/{total} [{perc:.2f}%]".format(
                    done=counter.value, total=total, perc=done_percent)
                )
                shown.add(int_percent)

            # save to db, dump json or similar
            if callback and callable(callback):
                callback(result)

        pool = ThreadPool(processes=16)
        self.log.info("Starting search...")
        started = time.time()
        pool.map(_exec_, start_intervals)

        self.log.info(
            "Search is complete, total {total} issues were found in {seconds}"
                .format(total=total, seconds=time.time() - started)
        )

note sure .. how to run this.. can u please help in elaborating this