Shutting down eXist

[Jason Smith-11]

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I am wondering if anyone knows a good strategy for shutting down eXist automatically when run as a service. 

 

I am running as a WAR in Tomcat (standalone, of course).  Using Tanuki JavaServiceWrapper. 

 

I'd like to be able to call the shutdown command when someone stops the service.  Otherwise I might have to use a special script to shut down my services in order (can't just shut down the server), or I guess take your chances with data corruption (not that it happens often enough to quantify).

 

Jason Smith
Software Engineer
InfoTrust Group, Inc.

500 Discovery Parkway, Suite 200
Superior, CO 80027
Office 303-627-6571
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[Wolfgang Meier-2]

> I am wondering if anyone knows a good strategy for shutting down eXist
> automatically when run as a service.
>
> I am running as a WAR in Tomcat (standalone, of course).  Using Tanuki
> JavaServiceWrapper.

You should at least check the various timeout settings supported by
JavaServiceWrapper. We had some problems in the past with the wrapper
killing the JVM too early. When eXist receives a shutdown signal or
request, it will wait for writing transactions to complete. This can
take a few minutes, e.g. if a large document is being stored.

The best solution is to write your own WrapperListener (see
tools/wrapper/src/org/exist/wrapper/Main, which usually calls
org.exist.JettyStart), which would then launch Tomcat and register
shutdown hooks. The central eXist method to call for shutdown is
BrokerPool.stopAll(false).

eXist 1.2.6 and 1.4 also provide a callback mechanism, which can be
used to inform the wrapper that the database is still starting up or
shutting down. Just register an Observer with

BrokerPool.registerStatusObserver(observer);

This will effectively prevent the wrapper from killing the database as
long as it is still alive. org.exist.wrapper.Main implements the
Observer with

public void update(Observable o, Object arg) {
        if ("startup".equals(arg))
            WrapperManager.signalStarting(60000);
        else
            WrapperManager.signalStopping(60000);
    }

Wolfgang

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developing skills, take BlackBerry mobile applications to market and stay
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