How to get Uniform distributed queue message counts with help of JMX

Question

Hi,
Is there any way to get given queue message count, pending message counts using JMX. I can get all queue names and counts using JMX... after that i have to show only selected queue details.
Thanks,
-Som

Answer 1

Hi,
Following is the WLS snippet from an upcoming WLS JMS message management white paper that you can use to get the message statistics for a given destination.
With appropriate command line parameters, this script can be used to poll and dump the statistics of any destination on a specified interval.
Note that the WLST uses JMX API under the cover, so you can easily convert this into a pure JMX java program.
Hope this helps.
Kats
WebLogic JMS Message Statistics Script for weblogic.WLST
This script can be used for dumping message statistics of a given JMS Destination.
Based on the arguments, the script creates can print out message statistics
Usage: java weblogic.WLST msg_statistics.py [options]
Options:
  username=...           username to connect to WebLogic Server       - defaults to "weblogic"
  password=...           password to connect to WebLogic Server       - defaults to "weblogic"
  url=...                Provider URL of the Administration Server    - defaults to "t3://localhost:7001"
  wlsServerName=...      WebLogic Server Name                         - defaults to "examplesServer"
  jmsServerName=...      JMS Server Name that hosts the destination   - defaults to "examplesJMSServer"
  jmsModuleName=...      JMS Module Name that defines the destination - defaults to "examples-jms"
  jmsDestinationName=... JMS Destination name to get the statistics   - defaults to "exampleQueue"
  pollingIntervalInSeconds=... Time interval between statistics dump  - defaults to "60 secs"
  redirectStdout=...     File name to redirect the stdout of WLST     - defaults to no redirect and the results wil be printed out to stdout.
  help                   Prints out this usage help
Note that all the defaults are set based WebLogic Examples domain that is part of WebLogic Server installation.
The "examples" server can be started from "C:/Oracle/Middleware/wlserver_10.3/samples/domains/wl_server" using startWebLogic.sh
To try this script OOTB, start the "examples" server and run the JMS sample as described below.
cd :/Oracle/Middleware/wlserver_10.3/samples/domains/wl_server/bin
. ./setDomainEnv.sh
cd $WL_HOME/samples/server/examples/src/examples/jms/queue
javac -d . *.java
export CLASSPATH=".;$CLASSPATH"
java examples.jms.queue.QueueSend t3://localhost:7001
Follow the prompts to populate the queue
Examples:
  msg_statistics.py - Dump the message statistics of the exampleQueue for every 1 min
  msg_statistics.py user=weblogic pass=weblogic url=t3://localhost:7001
                      wlsServerName=examplesServer jmsServerName=examplesJMSServer
                jmsModuleName=examples-jms jmsDestinationName=exampleQueue
                pollingIntervalInSeconds=30
For more details on JMS Message Management using WLST, see "WebLogic JMS Message Management In a Nutshell" whitepaper.
from weblogic.jms.extensions import JMSMessageInfo
from weblogic.messaging.kernel import Cursor
from javax.jms import TextMessage
from javax.jms import DeliveryMode
from java.io import ByteArrayOutputStream
from java.io import StringBufferInputStream
from java.util import Properties
from java.util import Date
from java.lang import *
import jarray
import sys
# shows_messages() definition
def dump_statistics(wlsServerName, jmsServerName, jmsModuleName, jmsDestinationName, pollingIntervalInSeconds):
  pollingIntervalInMillis = long(pollingIntervalInSeconds) * 1000L
  domainRuntime()
  cd ('ServerRuntimes')
  spath = wlsServerName + "/JMSRuntime/" + wlsServerName +".jms"
  cd (spath)
  fullDestName=jmsServerName+'/Destinations/'+jmsModuleName +'!'+jmsDestinationName
  cdPathForDestName='JMSServers/'+ fullDestName
  cd (cdPathForDestName)
  while 1:
    print "========================================================================================================================"
    print "Messages     Messages      Messages      Messages      Bytes        Bytes        Bytes           Bytes    "
    print "Current       Pending       High          Received      Current      Pending      High            Received "
    print "Count         Count         Count         Count         Count        Count        Count           Count    "
    print "========================================================================================================================"
    s = "%8d     %8d     %8d     %8d     %8d     %8d     %8d     %d" % (cmo.getMessagesCurrentCount(), cmo.getMessagesPendingCount(), cmo.getMessagesHighCount(), cmo.getMessagesReceivedCount(), cmo.getBytesCurrentCount(), cmo.getBytesPendingCount(), cmo.getBytesHighCount(), cmo.getBytesReceivedCount())
    print s
    print ''
    Thread.sleep(long(pollingIntervalInMillis))
# Function to handle script arguments of the variety 'n=v', where
# arguments are placed into a dictionary of nv pairs and returned
# to the caller
def argsToDict(args):
  d = {}
  for arg in args:
    #print "arg: " + arg
    pair = arg.split('=', 1)
    #print "pair: " + str(pair)
    if len(pair) == 2:
      # binary argument, store as key pair
      key = pair[0]
      val = pair[1]
      d[key] = val
    else:
      # Unary argument, story with empty (non-null) key
      d[arg] = ''
  print "Arguments: " + str(d)
  return d
# Returns the value found in the provided map, at the location
# specified by 'key'; if no entry exists in the map for 'key',
# the provided default is returned.
def getValue(dict, key, default=None):
  ret = default
  if dict is not None:
    try:
      ret=dict[key]
    except KeyError:
      pass
  return ret
# Connect to the target server specified in the provide args
def connectIfNecessary(argsDict=None):
  # connect if necessary
  if connected == "false":
    user=getValue(argsDict, "user", "weblogic")
    passwd=getValue(argsDict, "pass", "weblogic")
    url=getValue(argsDict, "url", "t3://localhost:7001")
    print "Connecting with [" + user + "," + passwd + "," + url + "]"
    connect(user,passwd,url)
# Retrieve a positional argument if it exists; if not,
# the provided default is returned.
# Params:
# pos   The integer location in sys.argv of the parameter
# default  The default value to return if the parameter does not exist
# returns the value at sys.argv[pos], or the provided default if necesssary
def getPositionalArgument(pos, default):
  value=None
  try:
    value=sys.argv[pos]
  except:
    value=default
  return value
# Main
argsDict = argsToDict(sys.argv)
redirectOutputFileName = getValue(argsDict, "redirectStdout")
if redirectOutputFileName is None:
  pass
else:
  redirect(redirectOutputFileName, 'false')
  print "The output from this program gets written into file " + redirectOutputFileName
  sys.stdout = open(redirectOutputFileName, "w")
isHelp = getValue(argsDict, "help")
if isHelp is None:
  pass
else:
  print __doc__
  exit()
connectIfNecessary(argsDict)
wlsServerName = getValue(argsDict, "wlsServerName", "examplesServer")
jmsServerName = getValue(argsDict, "jmsServerName", "examplesJMSServer")
jmsModuleName = getValue(argsDict, "jmsModuleName", "examples-jms") 
jmsDestinationName = getValue(argsDict, "jmsDestinationName", "exampleQueue")
pollingIntervalInSeconds = getValue(argsDict, "pollingIntervalInSeconds", "60")
dump_statistics(wlsServerName, jmsServerName, jmsModuleName, jmsDestinationName, pollingIntervalInSeconds)
disconnect()
print 'End of script ...'
exit()