#!/usr/bin/env bash
# Isolation and read-only: honoured where the transaction starts, ignored where it joins.
set -euo pipefail
set +m
cd "$(dirname "$0")/.."
source scripts/env.sh
{
  echo "== isolation and readOnly =="
  echo
  start_app > /dev/null
  curl -s "http://127.0.0.1:${APP_PORT}/tx/isolation" | python3 -c '
import json,sys
d=json.load(sys.stdin)
def show(label, s):
    print("  %-46s active=%-5s readOnly=%-5s isolation=%s" % (
        label, s["actualTransactionActive"], s["readOnly"], s["isolationLevel"]))
show("@Transactional(readOnly = true)", d["readOnlyScope"])
print()
show("@Transactional(isolation = SERIALIZABLE) [outer]", d["serializableOuter"]["outer"])
show("  REQUIRED inner joining it", d["serializableOuter"]["inner"])
print()
show("plain @Transactional [outer]", d["participantDeclaringReadUncommitted"]["outer"])
show("  inner declaring READ_UNCOMMITTED", d["participantDeclaringReadUncommitted"]["inner"])'
  echo
  echo "The last pair is the point. The inner method declares"
  echo "@Transactional(isolation = READ_UNCOMMITTED) and gets ISOLATION_DEFAULT, because it"
  echo "joined an existing physical transaction whose isolation was fixed when it began."
  echo "The declaration is not rejected and nothing is logged -- it is simply ignored."
  echo
  echo "Set validateExistingTransaction=true on the transaction manager and this becomes an"
  echo "exception instead of a silent no-op. It is off by default."
  echo
  echo "The same applies to readOnly and timeout on a participating scope."
  echo
  echo "== the transaction manager's own log lines =="
  echo
  grep -E "Creating new transaction|Participating in existing" "$LOG" | tidy | head -12
  echo
  echo "Note ISOLATION_SERIALIZABLE appears on the 'Creating new transaction' line and never"
  echo "on a 'Participating' one: participation carries no settings of its own."
  stop_app
} > docs/output/05-isolation.txt 2>&1
cat docs/output/05-isolation.txt