FITS with Nailgun?

[jpstroop]

Logging this here just so that I don't forget; not saying it's necessarily something we should do. I just noticed that FITS contains a script, fits-ngserver.sh that starts a Nailgun server, which would save us having to spin up the JVM for every call to FITS. We'd probably get a good performance boost.

#!/bin/bash
#
# This helper script launches a nailgun server with the FITS
# classpath, making it simple to launch a persistent JVM for FITS.
# 
# The one required parameter is the path to nailgun's jar; it can also be
# specified via the NAILGUN_JAR environment variable.

. "$(dirname $BASH_SOURCE)/fits-env.sh"

if [[ ! $NAILGUN_JAR ]] && [[ ! $1 ]]; then
        echo "Error: Path to Nailgun JAR must be specified!" >&2
        echo "Usage: fits-ngserver.sh [path-to-nailgun.jar]" >&2
        echo "The path may also be specified via the NAILGUN_JAR environment variable." >&2
        exit 64
else
        NAILGUN_JAR=$1
fi

cmd="java -classpath \"$APPCLASSPATH:$NAILGUN_JAR\" com.martiansoftware.nailgun.NGServer"

echo "You may now run FITS by typing: ng edu.harvard.hul.ois.fits.Fits [options]" >&2

eval "exec $cmd"

[jpstroop]

me@here:~ $ fits-ngserver.sh $NAILGUN_JAR &
[1] 9820
me@here:~ $ You may now run FITS by typing: ng edu.harvard.hul.ois.fits.Fits [options]
Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar 
NGServer started on all interfaces, port 2113.

me@here:~ $ time ng-nailgun edu.harvard.hul.ois.fits.Fits -i Desktop/pul-logo-tall-md-trans_0.png -o /tmp/sample.xml

real    0m1.854s // <------------------------------
user    0m0.000s
sys 0m0.000s
NGSession 1: 127.0.0.1: edu.harvard.hul.ois.fits.Fits exited with status 0
me@here:~ $ time ng-nailgun edu.harvard.hul.ois.fits.Fits -i Desktop/pul-logo-tall-md-trans_0.png -o /tmp/sample.xml

real    0m0.464s // <------------------------------
user    0m0.000s
sys 0m0.000s
NGSession 2: 127.0.0.1: edu.harvard.hul.ois.fits.Fits exited with status 0

[jpstroop]

Closing, forgot that the actual call to fits was in a separate gem. Opened as a question in samvera/hydra-file_characterization#21