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HHH-16545 PersistenceUtil.MetadataCache needs to be threadsafe

This commit is contained in:
Sanne Grinovero 2023-05-04 21:41:21 +03:00 committed by Sanne Grinovero
parent 60d449e8da
commit 7eacbfab3c
1 changed files with 33 additions and 14 deletions
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45
hibernate-core/src/main/java/org/hibernate/jpa/internal/util/PersistenceUtilHelper.java
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@ -6,6 +6,7 @@
*/
package org.hibernate.jpa.internal.util;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
@ -16,7 +17,7 @@ import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;
import jakarta.persistence.spi.LoadState;
import org.hibernate.HibernateException;
@ -411,24 +412,42 @@ public final class PersistenceUtilHelper {
}
/**
* Cache hierarchy and member resolution in a weak hash map
* Cache hierarchy and member resolution, taking care to not leak
* references to Class instances.
*/
//TODO not really thread-safe
public static class MetadataCache implements Serializable {
private transient Map<Class<?>, ClassMetadataCache> classCache = new WeakHashMap<>();
public static final class MetadataCache implements Serializable {
private final ClassValue<ClassMetadataCache> metadataCacheClassValue;
private void readObject(java.io.ObjectInputStream stream) {
classCache = new WeakHashMap<>();
public MetadataCache() {
this( new MetadataClassValue() );
}
ClassMetadataCache getClassMetadata(Class<?> clazz) {
ClassMetadataCache classMetadataCache = classCache.get( clazz );
if ( classMetadataCache == null ) {
classMetadataCache = new ClassMetadataCache( clazz );
classCache.put( clazz, classMetadataCache );
//To help with serialization: no need to serialize the actual metadataCacheClassValue field
private MetadataCache(ClassValue<ClassMetadataCache> metadataCacheClassValue) {
this.metadataCacheClassValue = metadataCacheClassValue;
}
return classMetadataCache;
Object writeReplace() throws ObjectStreamException {
//Writing a different instance which doesn't include the cache
return new MetadataCache(null);
}
private Object readResolve() throws ObjectStreamException {
//Ensure we do instantiate a new cache instance on deserialization
return new MetadataCache();
}
ClassMetadataCache getClassMetadata(final Class<?> clazz) {
return metadataCacheClassValue.get( clazz );
}
}
private static final class MetadataClassValue extends ClassValue<ClassMetadataCache> {
@Override
protected ClassMetadataCache computeValue(final Class type) {
return new ClassMetadataCache( type );
}
}