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Re: [Wrapper-user] Using the wrapper integration method 3
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From: Leif M. <le...@ta...> - 2008-06-27 19:02:45
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Jay,
I am not sure how Ruby would be doing this but it would surprise beif
they were daemons by default.
Try doing a thread dump. The JVM looks like it is shutting down
fairly quickly so try adding code like the following after you start
your Ruby thread.
try {
Thread.sleep(500); // Let Ruby start.
} catch (InterruptedException e) {
//Something
}
org.tanukisoftware.wrapper.WrapperManager.requestThreadDump();
A daemon thread will look something like this:
"Reference Handler" daemon prio=10 tid=0x0003efb0 nid=0x308 in
Object.wait() [0x02b8f000..0x02b8fd68]
Non daemon like this:
"AWT-EventQueue-0" prio=7 tid=0x02d65170 nid=0x940 in Object.wait()
[0x0436f000..0x0436fd68]
If all else fails, you may need to create a simple java thread which
starts and loops until a flag is set from the WrapperListener.stop
method or something.
Cheers,
Leif
On Fri, Jun 27, 2008 at 9:29 PM, <Jay...@sc...> wrote:
> Sorry about the no timestamps... How do I turn those on?
>
> What am I doing...
>
> In my start method I am spinning up a Jruby VM and in that VM I am spawning
> a thread. It is my understanding that in Jruby .. Ruby threads are Java
> threads... But they may not be non daemon threads I will look into that.
>
> Here are the pertinent functions:
>
> public Integer start( String[] args)
> {
> if (_service == null)
> {
> LauncherOptions opts = new LauncherOptions();
> CmdLineParser parser = new CmdLineParser(opts);
> try{
> parser.parseArgument(args);
> } catch( CmdLineException e ) {
> System.err.println(e.getMessage());
> System.err.println(" Example: java
> ServiceLauncher"+parser.printExample(ALL));
> parser.printUsage(System.err);
> System.err.println();
> return -1;
> }
> initialize(opts.serviceClassName, opts.serviceFileName,
> opts.serviceInstanceName);
>
> }
>
> _service.start();
> return null;
> }
>
> public void initialize(String serviceClassName, String serviceFile, String
> serviceName)
> {
> try {
> String filename = serviceFile.split("\\.")[0];
> // Create runtime instance of the Ruby VM
> _rubyRuntime = Ruby.newInstance();
> _rubyRuntime.evalScriptlet(String.format("require '%s'",filename));
> Object rfj =
> _rubyRuntime.evalScriptlet(String.format("%s.new",serviceClassName,
> serviceName));
> rfj = org.jruby.javasupport.JavaEmbedUtils.rubyToJava(_rubyRuntime,
> (org.jruby.runtime.builtin.IRubyObject) rfj,
> AffinityService.class); //((AffinityService)rfj).start();
>
> _service = (AffinityService)rfj;
>
> } catch (Throwable e) {
> System.err.println("Exception creating the service: ");
> e.printStackTrace(System.err);
> }
> }
>
> Here is the Ruby code that gets executed:
>
> class RubyService < tv.seachange.affininty.util.AffinityService
> attr_reader :name
> def initialize
> #configure the service for the common stuff
> @name = "RubyService"
> end
>
> def start
> @thread = Thread.new do
> @started = true
> spin_up
> end
> end
>
> def stop
> @started = false
> spin_down
> end
> end
>
>
>
> ________________________________
>
> From: wra...@li...
> [mailto:wra...@li...] On Behalf Of "Leif
> Mortenson" <le...@ta...>
> Sent: Thursday, June 26, 2008 10:48 PM
> To: Wrapper User List
> Subject: Re: [Wrapper-user] Using the wrapper integration method 3
>
>
> Jay,
> see this part of the log:
>
>> jvm 1 | WrapperManager Debug: calling WrapperListener.start()
>> jvm 1 | WrapperManager Debug: Waiting for WrapperListener.start runner
>> thread to complete.
>> jvm 1 | WrapperManager Debug: WrapperListener.start runner thread started.
>> jvm 1 | Starting up!
>> jvm 1 | WrapperManager Debug: WrapperListener.start runner thread stopped.
>> jvm 1 | hi
>> jvm 1 | WrapperManager Debug: returned from WrapperListener.start()
>> jvm 1 | WrapperManager Debug: Send a packet STARTED :
>> wrapperp | read a packet STARTED :
>> wrapper | JVM signalled that it was started.
>> jvm 1 | WrapperManager Debug: Startup runner thread stopped.
>> jvm 1 | WrapperManager Debug: ShutdownHook started
>
> The Wrapper is calling WrapperListener.start in your application.
> That returns and the WrapperManager reports that the application has
> started. The WrapperManager starts up something called the start
> runner which runs while the application is being started to keep the
> JVM from shutting itself down due to a lack of non-daemon threads.
> The problem is that as soon as that thread completes, there are no
> longer any non-daemon threads running so the JVM is initiating a
> shutdown. This is all correct behavior for the Wrapper.
>
> What exactly are you doing inside of your WrapperListener.start
> method? Are you starting any non-daemon threads which make up the
> application that should be running?
>
> If we exchange any more log files, please include time stamps. They
> are useful in understanding the timing of when things happen.
>
> Cheers,
> Leif
>
> On Fri, Jun 27, 2008 at 7:13 AM, < Jay...@sc...> wrote:
>> Leif,
>>
>> Here is the log. ...
>>
>> It could definitely be a thread thing.
>>
>> I am spinning up a thread in Jruby. (my java code launches a ruby vm and
>> in
>> ruby I am creating a thread)
>>
>> Jay
>>
> < log snip>
>>
>>
>>
>> ====
>>
>> Could you please set the wrapper.debug=true property and then reply with
>> the resulting wrapper.log attached. I only need to see a single Wrapper
>> invocation so delete the old wrapper.log file first. The log should
>> allow me to say what your exact problem is.
>>
>> Cheers,
>> Leif
>>
>> Jay...@sc... wrote:
>>> Hi,
>>>
>>> I'm playing around with the service wrapper and trying to get an example
>>> running using integration method 3. I'm running on the Mac OS X.
>>>
>>> Everything appears to work. The service starts up when I use the start
>>> script (sh.script.ln) except that after a few seconds the infrastructure
>>> appears to call a stop on my service.
>>>
>>> Does anyone know the reasons why the stop would be called? I've
>>> returned null from my start method. I spun up my logic in a thread
>>> although I did the thread start in a wierd way. (what if the thread
>>> exited (that's not necessarily happening but I'm trying to learn)?).
>>>
>>> My service is a very simple loop where I'm just printing a message to
>>> std out every second.
>>>
>>
>
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