[daisy] tanuki wrapper dependencies

[Paul Focke]

Steven Noels wrote:
> On 07 Sep 2006, at 09:38, Victor Oomens wrote:
>> But now, after rebooting the machine (which has been scheduled to run 
>> every week),
> why that? any Daisy-related reason? we run Daisy on boxes which have 
> been up for more than a year.
>> the repository fails to connect to OpenJMS. It seems that openjms 
>> isn’t running when the repo tries to connect.
> could you provide us with some factual error output? I don't have much 
> Redhat experience, but knowing things for sure might help. Have you 
> tweaked the order in which services are started? How? Adding a sleep 
> statement in the shell scripts might help as well.
>> To solve that, I’ve added some lines to the dsy_repo startup script. 
>> The script now first waits for the openjms to become available before 
>> starting the repository. However, this doesn’t seem to be full proof.
>>
>>
>>
>> Is there another solution? For example, can I configure the tanuki 
>> wrapper to detect the OpenJMS dependency?
> that's obviously a tanuki question. Paul has been working on a Debian 
> package and I know he encountered some of that stuff as well. Maybe he 
> has some tips or ideas.
Basically what I do is add a check to wait (sleeps) until the service 
has started before moving on.  Here is code example of this check

wait_for_server_start () {
  port=$1
  counter=0
  serverstatus=`netstat -l  | grep -e "^tcp.*:${port}"`
  while [[ -z "${serverstatus}" &&  ${counter} -lt 12 ]]; do
    sleep 2s
    serverstatus=`netstat -l  | grep -e "^tcp.*:${port}"`
    let counter=counter+1
  done
  if [ -z "${serverstatus}" ]; then
    echo Not listening to port $port .  Exiting ...
    exit 1
  else
    echo Listening to port $port
  fi
}

Then in the start() function of the service method at the end of the 
true branch in if structure I add

wait_for_server_start $LISTEN_PORT
where LISTEN_PORT is the port the server listens to.  In OpenJMS this 
would be 3030, if I remember correctly.

Now if the script fails then you should have a look at your OpenJMS 
setup.  The logging is also a good place to have a look at if services 
don't seem to start.

Paul
>
> </Steven>
> --Steven Noels                            http://outerthought.org/
> Outerthought                              Open Source Java & XML
> stevenn at outerthought.org                stevenn at apache.org
>
>
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