HHH-7667 - Investigate expanding bytecode enhancement support
This commit is contained in:
Steve Ebersole
parent
93f4fe0668
commit
5506a48bea
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@ -23,12 +23,40 @@
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*/
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package org.hibernate.bytecode.enhance.spi;
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import java.security.ProtectionDomain;
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import javassist.CtField;
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/**
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* @author Steve Ebersole
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*/
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public interface EnhancementContext {
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/**
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* Does the given class name represent a entity class?
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*
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* @param className The name of the class to check.
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*
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* @return {@code true} if the class is an entity; {@code false} otherwise.
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*/
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public boolean isEntityClass(String className);
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/**
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* Does the given class name represent an embeddable/component class?
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*
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* @param className The name of the class to check.
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*
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* @return {@code true} if the class is an embeddable/component; {@code false} otherwise.
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*/
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public boolean isCompositeClass(String className);
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/**
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* Does the field represent persistent state? Persistent fields will be "enhanced".
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* <p/>
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* todo : not sure its a great idea to expose Javassist classes this way.
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// may be better to perform basic checks in the caller (non-static, etc) and call out with just the
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// Class name and field name...
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* @param ctField The field reference.
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*
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* @return {@code true} if the field is ; {@code false} otherwise.
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*/
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public boolean isPersistentField(CtField ctField);
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}
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@ -28,11 +28,13 @@ import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.util.IdentityHashMap;
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import javassist.CannotCompileException;
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import javassist.ClassPool;
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import javassist.CtClass;
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import javassist.CtField;
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import javassist.CtMethod;
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import javassist.CtNewMethod;
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import javassist.Modifier;
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import javassist.bytecode.AnnotationsAttribute;
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@ -44,7 +46,7 @@ import org.jboss.logging.Logger;
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import org.hibernate.HibernateException;
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import org.hibernate.bytecode.enhance.EnhancementException;
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import org.hibernate.bytecode.internal.javassist.FieldHandled;
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import org.hibernate.engine.spi.Managed;
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import org.hibernate.engine.spi.ManagedComposite;
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import org.hibernate.engine.spi.ManagedEntity;
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import org.hibernate.engine.spi.EntityEntry;
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@ -57,6 +59,9 @@ import org.hibernate.internal.CoreMessageLogger;
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public class Enhancer {
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private static final CoreMessageLogger log = Logger.getMessageLogger( CoreMessageLogger.class, Enhancer.class.getName() );
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private static final String PERSISTENT_FIELD_READER_PREFIX = "$hibernate_read_";
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private static final String PERSISTENT_FIELD_WRITER_PREFIX = "$hibernate_write_";
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public static final String ENTITY_INSTANCE_GETTER_NAME = "hibernate_getEntityInstance";
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public static final String ENTITY_ENTRY_FIELD_NAME = "$hibernate_entityEntryHolder";
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@ -168,7 +173,7 @@ public class Enhancer {
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final String[] interfaceNames = managedCtClass.getClassFile2().getInterfaces();
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for ( String interfaceName : interfaceNames ) {
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if ( FieldHandled.class.getName().equals( interfaceName ) ) {
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if ( Managed.class.getName().equals( interfaceName ) ) {
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log.debug( "skipping enhancement : already enhanced" );
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return;
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}
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@ -191,13 +196,18 @@ public class Enhancer {
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// add the ManagedEntity interface
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managedCtClass.addInterface( managedEntityCtClass );
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addEntityInstanceHandling( managedCtClass, constPool );
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addEntityEntryHandling( managedCtClass, constPool );
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addLinkedPreviousHandling( managedCtClass, constPool );
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addLinkedNextHandling( managedCtClass, constPool );
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// enhancePersistentAttributes( managedCtClass );
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addEntityInstanceHandling( managedCtClass );
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addEntityEntryHandling( managedCtClass );
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addLinkedPreviousHandling( managedCtClass );
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addLinkedNextHandling( managedCtClass );
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}
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private void addEntityInstanceHandling(CtClass managedCtClass, ConstPool constPool) {
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private void enhanceAsComposite(CtClass classFile) {
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}
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private void addEntityInstanceHandling(CtClass managedCtClass) {
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// add the ManagedEntity#hibernate_getEntityInstance method
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try {
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managedCtClass.addMethod(
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@ -224,7 +234,9 @@ public class Enhancer {
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// essentially add `return this;`
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}
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private void addEntityEntryHandling(CtClass managedCtClass, ConstPool constPool) {
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private void addEntityEntryHandling(CtClass managedCtClass) {
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final ConstPool constPool = managedCtClass.getClassFile().getConstPool();
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// add field to hold EntityEntry
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final CtField entityEntryField;
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try {
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@ -243,6 +255,7 @@ public class Enhancer {
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// make that new field transient and @Transient
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entityEntryField.setModifiers( entityEntryField.getModifiers() | Modifier.TRANSIENT );
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entityEntryField.setModifiers( Modifier.setPrivate( entityEntryField.getModifiers() ) );
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AnnotationsAttribute annotationsAttribute = getVisibleAnnotations( entityEntryField.getFieldInfo() );
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annotationsAttribute.addAnnotation( new Annotation( Transient.class.getName(), constPool ) );
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@ -279,11 +292,13 @@ public class Enhancer {
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}
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}
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private void addLinkedPreviousHandling(CtClass managedCtClass, ConstPool constPool) {
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private void addLinkedPreviousHandling(CtClass managedCtClass) {
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final ConstPool constPool = managedCtClass.getClassFile().getConstPool();
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// add field to hold "previous" ManagedEntity
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final CtField previousField;
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try {
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previousField = new CtField( managedCtClass, PREVIOUS_FIELD_NAME, managedCtClass );
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previousField = new CtField( managedEntityCtClass, PREVIOUS_FIELD_NAME, managedCtClass );
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managedCtClass.addField( previousField );
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}
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catch (CannotCompileException e) {
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@ -298,6 +313,7 @@ public class Enhancer {
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// make that new field transient and @Transient
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previousField.setModifiers( previousField.getModifiers() | Modifier.TRANSIENT );
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previousField.setModifiers( Modifier.setPrivate( previousField.getModifiers() ) );
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AnnotationsAttribute annotationsAttribute = getVisibleAnnotations( previousField.getFieldInfo() );
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annotationsAttribute.addAnnotation( new Annotation( Transient.class.getName(), constPool ) );
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@ -330,11 +346,13 @@ public class Enhancer {
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}
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}
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private void addLinkedNextHandling(CtClass managedCtClass, ConstPool constPool) {
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private void addLinkedNextHandling(CtClass managedCtClass) {
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final ConstPool constPool = managedCtClass.getClassFile().getConstPool();
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// add field to hold "next" ManagedEntity
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final CtField nextField;
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try {
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nextField = new CtField( managedCtClass, NEXT_FIELD_NAME, managedCtClass );
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nextField = new CtField( managedEntityCtClass, NEXT_FIELD_NAME, managedCtClass );
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managedCtClass.addField( nextField );
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}
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catch (CannotCompileException e) {
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@ -347,8 +365,9 @@ public class Enhancer {
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);
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}
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// make that new field transient and @Transient
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// make that new field (1) private, (2) transient and (3) @Transient
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nextField.setModifiers( nextField.getModifiers() | Modifier.TRANSIENT );
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nextField.setModifiers( Modifier.setPrivate( nextField.getModifiers() ) );
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AnnotationsAttribute annotationsAttribute = getVisibleAnnotations( nextField.getFieldInfo() );
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annotationsAttribute.addAnnotation( new Annotation( Transient.class.getName(), constPool ) );
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@ -390,8 +409,84 @@ public class Enhancer {
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return annotationsAttribute;
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}
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private void enhanceAsComposite(CtClass classFile) {
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private void enhancePersistentAttributes(CtClass managedCtClass) {
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final IdentityHashMap<CtField,FieldVirtualReadWritePair> fieldToMethodsXref = new IdentityHashMap<CtField, FieldVirtualReadWritePair>();
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for ( CtField ctField : managedCtClass.getFields() ) {
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if ( ! enhancementContext.isPersistentField( ctField ) ) {
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continue;
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}
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final FieldVirtualReadWritePair methodPair = addReadAndWriteMethod( managedCtClass, ctField );
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fieldToMethodsXref.put( ctField, methodPair );
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}
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transformFieldAccessesIntoReadsAndWrites( managedCtClass, fieldToMethodsXref );
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}
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private FieldVirtualReadWritePair addReadAndWriteMethod(CtClass managedCtClass, CtField persistentField) {
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// add the "reader"
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final CtMethod reader = generateFieldReader( managedCtClass, persistentField );
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// add the "writer"
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final CtMethod writer = generateFieldWriter( managedCtClass, persistentField );
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return new FieldVirtualReadWritePair( reader, writer );
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}
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private CtMethod generateFieldReader(CtClass managedCtClass, CtField persistentField) {
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// todo : temporary; still need to add hooks into lazy-loading
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try {
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final String name = PERSISTENT_FIELD_READER_PREFIX + persistentField.getName();
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CtMethod reader = CtNewMethod.getter( name, persistentField );
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managedCtClass.addMethod( reader );
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return reader;
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}
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catch (CannotCompileException e) {
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throw new EnhancementException(
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String.format(
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"Could not enhance entity class [%s] to add virtual reader method for field [%s]",
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managedCtClass.getName(),
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persistentField.getName()
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),
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e
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);
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}
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}
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private CtMethod generateFieldWriter(CtClass managedCtClass, CtField persistentField) {
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// todo : temporary; still need to add hooks into lazy-loading and dirtying
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try {
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final String name = PERSISTENT_FIELD_WRITER_PREFIX + persistentField.getName();
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CtMethod writer = CtNewMethod.setter( name, persistentField );
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managedCtClass.addMethod( writer );
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return writer;
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}
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catch (CannotCompileException e) {
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throw new EnhancementException(
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String.format(
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"Could not enhance entity class [%s] to add virtual writer method for field [%s]",
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managedCtClass.getName(),
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persistentField.getName()
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),
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e
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);
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}
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}
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private void transformFieldAccessesIntoReadsAndWrites(
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CtClass managedCtClass,
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IdentityHashMap<CtField, FieldVirtualReadWritePair> fieldToMethodsXref) {
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}
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private static class FieldVirtualReadWritePair {
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private final CtMethod readMethod;
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private final CtMethod writeMethod;
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private FieldVirtualReadWritePair(CtMethod readMethod, CtMethod writeMethod) {
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this.readMethod = readMethod;
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this.writeMethod = writeMethod;
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}
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}
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}
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@ -24,6 +24,7 @@
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package org.hibernate.tool.enhance;
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import javax.persistence.Entity;
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import javax.persistence.Transient;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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@ -33,7 +34,10 @@ import java.util.List;
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import javassist.ClassPool;
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import javassist.CtClass;
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import javassist.CtField;
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import javassist.NotFoundException;
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import javassist.bytecode.AnnotationsAttribute;
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import javassist.bytecode.annotation.Annotation;
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import org.apache.tools.ant.BuildException;
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import org.apache.tools.ant.DirectoryScanner;
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import org.apache.tools.ant.Project;
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@ -74,6 +78,12 @@ public class EnhancementTask extends Task {
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public boolean isCompositeClass(String className) {
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return false;
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}
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@Override
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public boolean isPersistentField(CtField ctField) {
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// current check is to look for @Transient
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return ! ctField.hasAnnotation( Transient.class );
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}
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};
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// we use the CtClass stuff here just as a simple vehicle for obtaining low level information about
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@ -36,6 +36,7 @@ import java.util.Arrays;
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import javassist.CannotCompileException;
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import javassist.ClassPool;
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import javassist.CtClass;
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import javassist.CtField;
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import javassist.LoaderClassPath;
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import javassist.NotFoundException;
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@ -44,27 +45,25 @@ import org.hibernate.LockMode;
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import org.hibernate.bytecode.enhance.spi.EnhancementContext;
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import org.hibernate.bytecode.enhance.spi.Enhancer;
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import org.hibernate.engine.spi.EntityEntry;
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import org.hibernate.engine.spi.ManagedEntity;
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import org.hibernate.engine.spi.Status;
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import org.junit.Test;
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import org.hibernate.testing.junit4.BaseUnitTestCase;
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import org.hibernate.testing.junit4.ExtraAssertions;
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import static org.hibernate.testing.junit4.ExtraAssertions.assertTyping;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertNull;
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import static org.junit.Assert.assertSame;
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import static org.junit.Assert.fail;
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/**
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* @author Steve Ebersole
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*/
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public class EnhancerTest extends BaseUnitTestCase {
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@Test
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public void testEnhancement()
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throws IOException, CannotCompileException, NotFoundException,
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NoSuchMethodException, IllegalAccessException, InstantiationException, InvocationTargetException {
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EnhancementContext enhancementContext = new EnhancementContext() {
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private static EnhancementContext enhancementContext = new EnhancementContext() {
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@Override
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public boolean isEntityClass(String className) {
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return true;
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@ -74,38 +73,64 @@ public class EnhancerTest extends BaseUnitTestCase {
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public boolean isCompositeClass(String className) {
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return false;
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}
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@Override
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public boolean isPersistentField(CtField ctField) {
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return true;
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}
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};
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@Test
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public void testEnhancement() throws Exception {
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testFor( SimpleEntity.class );
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testFor( SubEntity.class );
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}
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private void testFor(Class entityClassToEnhance) throws Exception {
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Enhancer enhancer = new Enhancer( enhancementContext );
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CtClass anEntityCtClass = generateCtClassForAnEntity();
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byte[] original = anEntityCtClass.toBytecode();
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byte[] enhanced = enhancer.enhance( anEntityCtClass.getName(), original );
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CtClass entityCtClass = generateCtClassForAnEntity( entityClassToEnhance );
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byte[] original = entityCtClass.toBytecode();
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byte[] enhanced = enhancer.enhance( entityCtClass.getName(), original );
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assertFalse( "entity was not enhanced", Arrays.equals( original, enhanced ) );
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ClassLoader cl = new ClassLoader() { };
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ClassPool cp2 = new ClassPool( false );
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cp2.appendClassPath( new LoaderClassPath( cl ) );
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CtClass enhancedCtClass = cp2.makeClass( new ByteArrayInputStream( enhanced ) );
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Class simpleEntityClass = enhancedCtClass.toClass( cl, this.getClass().getProtectionDomain() );
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Object simpleEntityInstance = simpleEntityClass.newInstance();
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Class entityClass = enhancedCtClass.toClass( cl, this.getClass().getProtectionDomain() );
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Object entityInstance = entityClass.newInstance();
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assertTyping( ManagedEntity.class, entityInstance );
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// call the new methods
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Method setter = simpleEntityClass.getMethod( Enhancer.ENTITY_ENTRY_SETTER_NAME, EntityEntry.class );
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Method getter = simpleEntityClass.getMethod( Enhancer.ENTITY_ENTRY_GETTER_NAME );
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assertNull( getter.invoke( simpleEntityInstance ) );
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setter.invoke( simpleEntityInstance, makeEntityEntry() );
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assertNotNull( getter.invoke( simpleEntityInstance ) );
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setter.invoke( simpleEntityInstance, new Object[] { null } );
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assertNull( getter.invoke( simpleEntityInstance ) );
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//
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Method setter = entityClass.getMethod( Enhancer.ENTITY_ENTRY_SETTER_NAME, EntityEntry.class );
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Method getter = entityClass.getMethod( Enhancer.ENTITY_ENTRY_GETTER_NAME );
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assertNull( getter.invoke( entityInstance ) );
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setter.invoke( entityInstance, makeEntityEntry() );
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assertNotNull( getter.invoke( entityInstance ) );
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setter.invoke( entityInstance, new Object[] {null} );
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assertNull( getter.invoke( entityInstance ) );
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Method entityInstanceGetter = simpleEntityClass.getMethod( Enhancer.ENTITY_INSTANCE_GETTER_NAME );
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assertSame( simpleEntityInstance, entityInstanceGetter.invoke( simpleEntityInstance ) );
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Method entityInstanceGetter = entityClass.getMethod( Enhancer.ENTITY_INSTANCE_GETTER_NAME );
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assertSame( entityInstance, entityInstanceGetter.invoke( entityInstance ) );
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Method previousGetter = entityClass.getMethod( Enhancer.PREVIOUS_GETTER_NAME );
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Method previousSetter = entityClass.getMethod( Enhancer.PREVIOUS_SETTER_NAME, ManagedEntity.class );
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previousSetter.invoke( entityInstance, entityInstance );
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assertSame( entityInstance, previousGetter.invoke( entityInstance ) );
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Method nextGetter = entityClass.getMethod( Enhancer.PREVIOUS_GETTER_NAME );
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Method nextSetter = entityClass.getMethod( Enhancer.PREVIOUS_SETTER_NAME, ManagedEntity.class );
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nextSetter.invoke( entityInstance, entityInstance );
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assertSame( entityInstance, nextGetter.invoke( entityInstance ) );
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}
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private CtClass generateCtClassForAnEntity() throws IOException, NotFoundException {
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private CtClass generateCtClassForAnEntity(Class entityClassToEnhance) throws Exception {
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ClassPool cp = new ClassPool( false );
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return cp.makeClass(
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getClass().getClassLoader().getResourceAsStream(
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SimpleEntity.class.getName().replace( '.', '/' ) + ".class"
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entityClassToEnhance.getName().replace( '.', '/' ) + ".class"
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)
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);
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}
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@ -0,0 +1,33 @@
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/*
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* Hibernate, Relational Persistence for Idiomatic Java
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*
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* Copyright (c) 2012, Red Hat Inc. or third-party contributors as
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* indicated by the @author tags or express copyright attribution
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* statements applied by the authors. All third-party contributions are
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* distributed under license by Red Hat Inc.
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*
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* This copyrighted material is made available to anyone wishing to use, modify,
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* copy, or redistribute it subject to the terms and conditions of the GNU
|
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* Lesser General Public License, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
|
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
|
||||
* along with this distribution; if not, write to:
|
||||
* Free Software Foundation, Inc.
|
||||
* 51 Franklin Street, Fifth Floor
|
||||
* Boston, MA 02110-1301 USA
|
||||
*/
|
||||
package org.hibernate.test.bytecode.enhancement;
|
||||
|
||||
import javax.persistence.Entity;
|
||||
|
||||
/**
|
||||
* @author Steve Ebersole
|
||||
*/
|
||||
@Entity
|
||||
public class SubEntity extends SuperEntity {
|
||||
}
|
||||
|
|
@ -0,0 +1,33 @@
|
|||
/*
|
||||
* Hibernate, Relational Persistence for Idiomatic Java
|
||||
*
|
||||
* Copyright (c) 2012, Red Hat Inc. or third-party contributors as
|
||||
* indicated by the @author tags or express copyright attribution
|
||||
* statements applied by the authors. All third-party contributions are
|
||||
* distributed under license by Red Hat Inc.
|
||||
*
|
||||
* This copyrighted material is made available to anyone wishing to use, modify,
|
||||
* copy, or redistribute it subject to the terms and conditions of the GNU
|
||||
* Lesser General Public License, as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
||||
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
|
||||
* for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Lesser General Public License
|
||||
* along with this distribution; if not, write to:
|
||||
* Free Software Foundation, Inc.
|
||||
* 51 Franklin Street, Fifth Floor
|
||||
* Boston, MA 02110-1301 USA
|
||||
*/
|
||||
package org.hibernate.test.bytecode.enhancement;
|
||||
|
||||
import javax.persistence.Entity;
|
||||
|
||||
/**
|
||||
* @author Steve Ebersole
|
||||
*/
|
||||
@Entity
|
||||
public class SuperEntity {
|
||||
}
|
||||
Loading…
Reference in New Issue