#!/usr/bin/env bash
# Starts one replica on a given port and stage, and waits for it to report healthy.
# Usage: start-instance.sh <port> <stage>
set -euo pipefail
DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "$DIR/env.sh"

PORT="$1"
STAGE="$2"

# -XX:TieredStopAtLevel=1 and a small fixed heap cut this JVM's own startup CPU
# burst dramatically (C2 compilation and heap sizing are the two biggest costs of a
# cold Spring Boot start). That matters here specifically because two replicas share
# a 2-core sandbox: a slow-starting replica can starve its own sibling's health
# checks long enough to look like an outage that never actually happened - see
# docs/11-the-load-generator.md.
nohup java -XX:TieredStopAtLevel=1 -XX:+UseSerialGC -Xms128m -Xmx256m \
    -jar "$JAR" --server.port="$PORT" --app.stage="$STAGE" \
    > "$EC_LOG_DIR/instance-$PORT.log" 2>&1 < /dev/null &
echo $! > "$EC_PID_DIR/$PORT.pid"
echo "started stage $STAGE on port $PORT (pid $(cat "$EC_PID_DIR/$PORT.pid"))"
wait_healthy "$PORT"
echo "port $PORT healthy"