(CkPython) Thread Pool Size

Demonstrates how to set the maximum number of threads in Chilkat's thread pool manager. Also demonstrates how to set a thread pool log file for help in diagnosing unexpected problems.

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux, Solaris

import sys
import chilkat

# All Chilkat classes can be unlocked at once at the beginning of a program
# by calling UnlockBundle.  It requires a Bundle unlock code.
chilkatGlob = chilkat.CkGlobal()
success = chilkatGlob.UnlockBundle("Anything for 30-day trial.")
if (success != True):
    print(chilkatGlob.lastErrorText())
    sys.exit()

# Set the maximum number of threads in the Chilkat thread pool to 12.
# This means that no more than 12 background worker threads will exist simultaneously.
# If more than 12 tasks are queued then some must wait for a worker thread to become free.
# Note: The Chilkat thread pool manager thread is a thread distinct from the
# worker threads.  It starts when the 1st asynchronous task is Run. 
chilkatGlob.put_MaxThreads(12)

# Also, the ThreadPoolLogPath can be set to cause the thread pool manager thread to
# keep a log file. This is for the purpose of debugging if unexpected problems occur.
chilkatGlob.put_ThreadPoolLogPath("/home/users/chilkat/logs/threadPoolLog.txt")

http1 = chilkat.CkHttp()
http2 = chilkat.CkHttp()
http3 = chilkat.CkHttp()

url1 = "http://www.marcusmiller.com/"
url2 = "http://www.tromboneshorty.com/"
url3 = "http://www.jamesmorrison.com/"

# Call the async version of the QuickGetStr method to return a task object.
# The task object is loaded, but is in the Inert state -- meaning it is
# not yet scheduled to run on Chilkat's background thread pool.
# task1 is a CkTask
task1 = http1.QuickGetStrAsync(url1)
if (http1.get_LastMethodSuccess() == False):
    print(http1.lastErrorText())
    sys.exit()

# task2 is a CkTask
task2 = http2.QuickGetStrAsync(url2)
if (http2.get_LastMethodSuccess() == False):
    print(http2.lastErrorText())

    sys.exit()

# task3 is a CkTask
task3 = http3.QuickGetStrAsync(url3)
if (http3.get_LastMethodSuccess() == False):
    print(http3.lastErrorText())

    sys.exit()

# At this point we have 3 task objects, each loaded with a Chilkat method call.
# Note: At this point no background threads are running.  The thread pool manager
# thread is not started -- it will start when the very first task is Run.

# Schedule each task for running on the thread pool.  This changes each task's state
# from Inert to Live. The thread pool manager thread starts with the 1st task queued.
# If the Global.ThreadPoolLogPath property was set, then
# the log file would be created (or appended) at this point.
success = task1.Run()
# Assuming success for brevity...
success = task2.Run()
success = task3.Run()

# The application is now free to do anything else
# while the HTML at the URL's are being downloaded in background threads.

# In this case, we'll just wait for all three tasks to finish.
# All three tasks are running simultaneously in separate background threads.
# We can wait for each in any order.  If Wait is called and the task has already
# finished (or been canceled), then the Wait method returns immediately.
maxWaitMs = 20000
success = task1.Wait(maxWaitMs)
success = task2.Wait(maxWaitMs)
success = task3.Wait(maxWaitMs)
# Assuming success for brevity...

err = "Task failed or canceled"
html1 = err
html2 = err
html3 = err

# Now get the HTML downloaded in each task:
if ((task1.get_StatusInt() == 7) and (task1.get_TaskSuccess() == True)):
    html1 = task1.getResultString()

if ((task2.get_StatusInt() == 7) and (task2.get_TaskSuccess() == True)):
    html2 = task2.getResultString()

if ((task3.get_StatusInt() == 7) and (task3.get_TaskSuccess() == True)):
    html3 = task3.getResultString()

print(html1)
print("----")
print(html2)
print("----")
print(html3)
print("----")