From a067a4c3cc03ff1a295c8bfabccd98bc689c58f5 Mon Sep 17 00:00:00 2001
From: Elon Azoulay <elon.azoulay@gmail.com>
Date: Sat, 2 Mar 2024 00:57:14 -0800
Subject: [PATCH] Cache types in ConstructorInstanceFactory

---
 .../reflect/ConstructorInstanceFactory.java   | 41 +++----------------
 1 file changed, 6 insertions(+), 35 deletions(-)

diff --git a/core/src/main/java/org/jdbi/v3/core/mapper/reflect/ConstructorInstanceFactory.java b/core/src/main/java/org/jdbi/v3/core/mapper/reflect/ConstructorInstanceFactory.java
index 04b19d1b6..c498348d4 100644
--- a/core/src/main/java/org/jdbi/v3/core/mapper/reflect/ConstructorInstanceFactory.java
+++ b/core/src/main/java/org/jdbi/v3/core/mapper/reflect/ConstructorInstanceFactory.java
@@ -22,21 +22,16 @@
 import java.lang.reflect.Type;
 import java.util.Arrays;
 import java.util.List;
-import java.util.Map;
-import java.util.WeakHashMap;
 import java.util.function.Supplier;
 import java.util.stream.Stream;
 
 import org.jdbi.v3.core.internal.exceptions.Unchecked;
 
-import static java.util.Collections.synchronizedMap;
 import static java.util.Objects.requireNonNull;
 import static java.util.stream.Collectors.toUnmodifiableList;
 
 class ConstructorInstanceFactory<T> extends InstanceFactory<T> {
     private static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
-    private static final Map<Constructor, ConstructorHandleAndTypes> CONSTRUCTOR_CACHE = synchronizedMap(new WeakHashMap<>());
-
     private final Constructor<T> constructor;
     private final List<Type> types;
     private final MethodHandle constructorHandle;
@@ -44,9 +39,8 @@ class ConstructorInstanceFactory<T> extends InstanceFactory<T> {
     ConstructorInstanceFactory(Constructor<T> constructor) {
         super(constructor);
         this.constructor = requireNonNull(constructor, "constructor is null");
-        ConstructorHandleAndTypes constructorHandleAndTypes = getConstructorHandleAndTypes(constructor, super::getTypes);
-        this.types = constructorHandleAndTypes.getTypes();
-        this.constructorHandle = constructorHandleAndTypes.getConstructorHandle();
+        this.types = extractTypes(constructor, super::getTypes);
+        this.constructorHandle = getConstructorMethodHandle(constructor);
     }
 
     @Override
@@ -88,18 +82,13 @@ private static <T> boolean isGenericInformationLost(Constructor<T> factory) {
         return lossDetected;
     }
 
-    private static <T> ConstructorHandleAndTypes getConstructorHandleAndTypes(Constructor<T> constructor, Supplier<List<Type>> defaultSupplier) {
-        return CONSTRUCTOR_CACHE.computeIfAbsent(constructor, ctor -> computeConstructorHandleAndTypes(ctor, defaultSupplier));
-    }
-
-    private static <T> ConstructorHandleAndTypes computeConstructorHandleAndTypes(Constructor<T> constructor, Supplier<List<Type>> defaultSupplier) {
-        MethodHandle constructorMethodHandle = getConstructorMethodHandle(constructor);
+    private static <T> List<Type> extractTypes(Constructor<T> constructor, Supplier<List<Type>> defaultSupplier) {
         if (isGenericInformationLost(constructor)) {
-            return new ConstructorHandleAndTypes(constructorMethodHandle, getFields(constructor)
+            return getFields(constructor)
                 .map(Field::getGenericType)
-                .collect(toUnmodifiableList()));
+                .collect(toUnmodifiableList());
         }
-        return new ConstructorHandleAndTypes(constructorMethodHandle, defaultSupplier.get());
+        return defaultSupplier.get();
     }
 
     private static <T> MethodHandle getConstructorMethodHandle(Constructor<T> constructor) {
@@ -114,22 +103,4 @@ private static <T> Stream<Field> getFields(Constructor<T> constructor) {
         return Arrays.stream(constructor.getDeclaringClass().getDeclaredFields())
             .filter(field -> !Modifier.isStatic(field.getModifiers()));
     }
-
-    private static class ConstructorHandleAndTypes {
-        private final MethodHandle constructorHandle;
-        private final List<Type> types;
-
-        ConstructorHandleAndTypes(MethodHandle constructorHandle, List<Type> types) {
-            this.constructorHandle = requireNonNull(constructorHandle, "constructorHandle is null");
-            this.types = requireNonNull(types, "types is null");
-        }
-
-        public MethodHandle getConstructorHandle() {
-            return constructorHandle;
-        }
-
-        public List<Type> getTypes() {
-            return types;
-        }
-    }
 }