#!/usr/bin/env bash
# The six ways @Transactional silently does nothing.
set -euo pipefail
set +m
cd "$(dirname "$0")/.."
source scripts/env.sh
{
  echo "== six pieces of code carrying @Transactional that are not transactional =="
  echo
  echo "Row 0 is the control: the SAME annotated method, reached through the proxy."
  echo
  start_app > /dev/null
  curl -s "http://127.0.0.1:${APP_PORT}/tx/silent" | python3 -m json.tool | sed 's/^/  /'
  echo
  echo "Reading it:"
  echo
  echo "  0  control            actualTransactionActive=true. The mechanism works."
  echo "  1  self-invocation    entryPoint() is not annotated and calls this.annotated...(),"
  echo "                        so the proxy is never involved. Same class, same annotation,"
  echo "                        no transaction."
  echo "  2  private method     a CGLIB proxy advises by overriding, and private methods"
  echo "                        cannot be overridden. Legal Java, no effect."
  echo "  3  checked exception  the default rollback rule is RuntimeException or Error. A"
  echo "                        checked exception propagates AND the transaction commits."
  echo "                        Fix: @Transactional(rollbackFor = Exception.class)."
  echo "  4  swallowed          nothing propagates, so the interceptor sees a normal return"
  echo "                        and commits. The write survives the failure it 'handled'."
  echo "  5  @PostConstruct     the proxy does not exist yet during initialisation."
  echo "  6  new                no container, no proxy, no transaction."
  echo
  echo "Note what rows 3 and 4 have in common: the row is still there afterwards. These two"
  echo "do not merely fail to start a transaction -- they start one and COMMIT work that the"
  echo "code was trying to abandon."
  stop_app
} > docs/output/04-silent-failures.txt 2>&1
cat docs/output/04-silent-failures.txt