#!/usr/bin/env bash
# Two facts about the circular-reference machinery, read out of the Framework and Boot jars rather than from docs:
#   36  the defaults of spring.main.allow-circular-references and spring.main.lazy-initialization
#   37  which post-processors supply an early reference, and the exception handler in preInstantiateSingleton
set -euo pipefail
cd "$(dirname "$0")/.."
mkdir -p output
M2=~/.m2/repository/org/springframework
BOOT=$M2/boot/spring-boot/4.1.1/spring-boot-4.1.1.jar
AOP=$M2/spring-aop/7.0.9/spring-aop-7.0.9.jar
CTX=$M2/spring-context/7.0.9/spring-context-7.0.9.jar
BEANS=$M2/spring-beans/7.0.9/spring-beans-7.0.9.jar
JP() { javap "$@" 2>&1 | grep -v '^Picked up'; }

{
  echo "# Defaults read from spring-configuration-metadata.json in spring-boot-4.1.1.jar"
  echo
  unzip -p "$BOOT" META-INF/spring-configuration-metadata.json | python3 -c '
import json,sys
d=json.load(sys.stdin)
for p in d["properties"]:
    if p["name"] in ("spring.main.allow-circular-references","spring.main.lazy-initialization"):
        print("%-40s default=%s" % (p["name"], p.get("defaultValue")))
'
} > output/36-main-property-defaults.txt

{
  echo "# Who hands out an early reference, and the handler in preInstantiateSingleton (Spring Framework 7.0.9 jars)"
  echo
  echo "--- the class that draws the report, in spring-boot-4.1.1.jar ---"
  unzip -l "$BOOT" | awk '/BeanCurrentlyInCreationFailureAnalyzer/ {print $4}'
  echo
  echo "--- AbstractAutoProxyCreator (spring-aop): declared methods that mention 'early' ---"
  JP -p -cp "$AOP" org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator | grep -i early | sed 's/^ *//'
  echo
  echo "--- AbstractAdvisingBeanPostProcessor (spring-aop): declared members that mention 'early' ---"
  n=$(JP -p -cp "$AOP" org.springframework.aop.framework.AbstractAdvisingBeanPostProcessor | grep -ci early || true)
  echo "matches: $n"
  echo
  echo "--- the @Async post-processor's ancestry ---"
  JP -cp "$CTX:$AOP" org.springframework.scheduling.annotation.AsyncAnnotationBeanPostProcessor | grep -o 'class [^ ]* extends [^ ]*'
  JP -cp "$AOP" org.springframework.aop.framework.autoproxy.AbstractBeanFactoryAwareAdvisingPostProcessor | grep -o 'class [^ ]* extends [^ ]*'
  echo
  echo "--- DefaultListableBeanFactory.preInstantiateSingleton(String, RootBeanDefinition): exception table ---"
  JP -p -c -cp "$BEANS" org.springframework.beans.factory.support.DefaultListableBeanFactory \
    | awk '/private java.util.concurrent.CompletableFuture<\?> preInstantiateSingleton\(/ {f=1} f&&/Exception table:/ {t=1} t {print} t&&/^  private void instantiateSingletonInBackgroundThread/ {exit}' \
    | grep -v 'instantiateSingletonInBackgroundThread' | sed 's/^ *//'
} > output/37-early-reference-bytecode.txt
cat output/36-main-property-defaults.txt output/37-early-reference-bytecode.txt