Chilkat2-Python

Thread Pool Size

See more Async Examples

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. Chilkat2-Python

import sys
import chilkat2

success = False

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

success = False

# 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. 
glob = chilkat2.Global()
glob.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.
glob.ThreadPoolLogPath = "/home/users/chilkat/logs/threadPoolLog.txt"

http1 = chilkat2.Http()
http2 = chilkat2.Http()
http3 = chilkat2.Http()

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.LastMethodSuccess == False):
    print(http1.LastErrorText)
    sys.exit()

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

    sys.exit()

# task3 is a CkTask
task3 = http3.QuickGetStrAsync(url3)
if (http3.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.StatusInt == 7) and (task1.TaskSuccess == True)):
    html1 = task1.GetResultString()

if ((task2.StatusInt == 7) and (task2.TaskSuccess == True)):
    html2 = task2.GetResultString()

if ((task3.StatusInt == 7) and (task3.TaskSuccess == True)):
    html3 = task3.GetResultString()

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