generate-jfr-files

#!/bin/bash

if [[ $# -ne 3 ]]; then
    echo "Invalid number of arguments."
    echo ""
    echo "Usage: generate-jfr-files <java-runtime> <class> <output-dir>"
    echo ""
    echo "java-runtime - the path to a Java interpreter to be used."
    echo "class - the name of the class to run. It is assumed that CLASSPATH has been properly set so that this class is reachable."
    echo "output-dir - the path to the directory where the output will be stored. The script will attempt to create the directory if it does not exist."
    exit 1
fi

JAVA="$1"
CLASS="$2"
OUTPUT_DIR="$3"

if [[ ! -x "$JAVA" || -d "$JAVA" ]]; then
    echo "Invalid path to Java interpreter."
    exit 1
fi

if [[ (-e "$OUTPUT_DIR" && (! -d "$OUTPUT_DIR" || ! -w "$OUTPUT_DIR" )) ]]; then
    echo "Invalid output directory."
    exit 1
elif [[ ! -e "$OUTPUT_DIR"  ]] && ! mkdir -p "$OUTPUT_DIR"; then
    echo "Could not create output directory."
    exit 1
fi

run_param() {
    PARAM="$1"
    OUTPUT_SUBDIR="$OUTPUT_DIR/${PARAM%=*}"
    FILENAME="$OUTPUT_SUBDIR/$PARAM.jfr"
    OPTION="-XX:StartFlightRecording=filename=$FILENAME,$PARAM"
    mkdir -p "$OUTPUT_SUBDIR"
    if ! "$JAVA" "$OPTION" "$CLASS"; then
        echo "Error running parameter \"$PARAM\"."
        exit 2
    fi
}

mkdir -p "$OUTPUT_DIR/default"
if ! "$JAVA" -XX:StartFlightRecording=filename="$OUTPUT_DIR/default/default.jfr" "$CLASS"; then
    echo "Error running default."
    exit 2
fi

run_param "delay=1s"
run_param "delay=2s"
run_param "delay=3s"
run_param "disk=false"
run_param "dumponexit=true"
run_param "duration=1s"
run_param "duration=2s"
run_param "duration=3s"
run_param "name=identifier123"
run_param "maxage=1s"
run_param "maxage=2s"
run_param "maxage=3s"
run_param "maxsize=1"
run_param "maxsize=10"
run_param "maxsize=100"
run_param "maxsize=1m"
run_param "maxsize=10m"
run_param "maxsize=100m"
run_param "maxsize=1g"
run_param "path-to-gc-roots=true"
run_param "settings=jdk11-profile.jfc"