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#!/bin/bash
STREAM_LIB_DIR=${STREAM_LIB_DIR:-./target}
HELP=0
function help () {
cat <<-HELP
topk -- Finds the top elements in a stream.
Usage: $( basename $0 ) [options] [CAPACITY] [RATE]
Finds the top elements in a stream, reporting a summary at the end.
topk looks for the Stream Summary analytics library at the location
of the environment variable STREAM_LIB_DIR (default is ./target).
Arguments:
CAPACITY Size of top / k (defaults to 1000)
RATE Report interim summary every RATE elements.
Options:
-h Displays this help.
Stream Lib Dir: ${STREAM_LIB_DIR}
HELP
}
function fail () {
echo "PREDICTABLE FAILURE. $1"
if [ "$2" ]; then
help
fi
exit 1
}
SHIFT=0
function incshift () {
SHIFT=$(( $SHIFT + ${1:-1} ))
}
for opt in $*; do
case "$opt" in
-h | -he | -hel | -help | --h | --he | --hel | --help )
HELP=1 ;;
esac
done
while getopts "h" opt; do
case $opt in
h ) HELP=1; incshift ;;
# $opt ) B=$OPTARG; incshift 2 ;;
esac
done
shift $SHIFT
if test $HELP == 1; then
help
exit 0
fi
java -cp "${STREAM_LIB_DIR}"/stream-*SNAPSHOT.jar com.clearspring.analytics.util.TopK $*
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