rostislav.matl: Monitoring Tomcat with Jmxterm and Python

Wrapping in Python

The problem with jmxterm si that its startup time is really long - even several seconds. Also connecting to process can take second or two. The reponsivness is good so if you need it for periodic monitoring, you would like to start it and connect and then fire requests when you need the data. After trying some approaches I settled on Python pexpect for this (script reduced to minimum):

import time  import pexpect    connection = "localhost:3993"  connection_timeout = 2    jmxterm = pexpect.spawn("java -jar jmxterm-1.0-alpha-4-uber.jar")  jmxterm.expect_exact("$>") # got prompt, we can continue  jmxterm.sendline("open " + connection)  jmxterm.expect_exact("#Connection to "+connection+" is opened", connection_timeout)    jmxterm.sendline("get -d Catalina -b name=http-80,type=ThreadPool currentThreadCount")    response_lines = []  response_lines.append(jmxterm.readline())  response_lines.append(jmxterm.readline())  response_lines.append(jmxterm.readline())  response_lines.append(jmxterm.readline())    result = response_lines[3].replace(";"," ").strip().split(" ")  del result[1]  name,value = result    print "["+time.ctime()+"]", name, "=", value  jmxterm.sendline("quit")

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