#Java #Hibernate
type 的类图
AssociationType: 关联类型的 type，主要用于外键等相关
IdentifierType: 主键相关的类型 type
BasicType: 基础类型，例如 long,int,string 等基础类型
type 注册
基础类型的注册器
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.type;
import java.io.Serializable;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.hibernate.HibernateException;
import org.hibernate.internal.CoreLogging;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.type.spi.TypeConfiguration;
import org.hibernate.usertype.CompositeUserType;
import org.hibernate.usertype.UserType;
/**
* A registry of {@link BasicType} instances
*
* @author Steve Ebersole
*/
public class BasicTypeRegistry implements Serializable {
private static final CoreMessageLogger LOG = CoreLogging.messageLogger( BasicTypeRegistry.class );
// TODO : analyze these sizing params; unfortunately this seems to be the only way to give a "concurrencyLevel"
// 使用 ConcurrentHashMap 保证线程安全
private Map<String, BasicType> registry = new ConcurrentHashMap<>( 100, .75f, 1 );
private boolean locked;
private TypeConfiguration typeConfiguration;
public BasicTypeRegistry(TypeConfiguration typeConfiguration){
this();
this.typeConfiguration = typeConfiguration;
}
// 构造方法，用于注册各种对应的基础类型
public BasicTypeRegistry() {
register( BooleanType.INSTANCE );
register( NumericBooleanType.INSTANCE );
register( TrueFalseType.INSTANCE );
register( YesNoType.INSTANCE );
register( ByteType.INSTANCE );
register( CharacterType.INSTANCE );
register( ShortType.INSTANCE );
register( IntegerType.INSTANCE );
register( LongType.INSTANCE );
register( FloatType.INSTANCE );
register( DoubleType.INSTANCE );
register( BigDecimalType.INSTANCE );
register( BigIntegerType.INSTANCE );
register( StringType.INSTANCE );
register( StringNVarcharType.INSTANCE );
register( CharacterNCharType.INSTANCE );
register( UrlType.INSTANCE );
register( DurationType.INSTANCE );
register( InstantType.INSTANCE );
register( LocalDateTimeType.INSTANCE );
register( LocalDateType.INSTANCE );
register( LocalTimeType.INSTANCE );
register( OffsetDateTimeType.INSTANCE );
register( OffsetTimeType.INSTANCE );
register( ZonedDateTimeType.INSTANCE );
register( DateType.INSTANCE );
register( TimeType.INSTANCE );
register( TimestampType.INSTANCE );
register( DbTimestampType.INSTANCE );
register( CalendarType.INSTANCE );
register( CalendarDateType.INSTANCE );
register( CalendarTimeType.INSTANCE );
register( LocaleType.INSTANCE );
register( CurrencyType.INSTANCE );
register( TimeZoneType.INSTANCE );
register( ClassType.INSTANCE );
register( UUIDBinaryType.INSTANCE );
register( UUIDCharType.INSTANCE );
register( BinaryType.INSTANCE );
register( WrapperBinaryType.INSTANCE );
register( RowVersionType.INSTANCE );
register( ImageType.INSTANCE );
register( CharArrayType.INSTANCE );
register( CharacterArrayType.INSTANCE );
register( TextType.INSTANCE );
register( NTextType.INSTANCE );
register( BlobType.INSTANCE );
register( MaterializedBlobType.INSTANCE );
register( ClobType.INSTANCE );
register( NClobType.INSTANCE );
register( MaterializedClobType.INSTANCE );
register( MaterializedNClobType.INSTANCE );
register( SerializableType.INSTANCE );
register( ObjectType.INSTANCE );
//noinspection unchecked
register( new AdaptedImmutableType( DateType.INSTANCE ) );
//noinspection unchecked
register( new AdaptedImmutableType( TimeType.INSTANCE ) );
//noinspection unchecked
register( new AdaptedImmutableType( TimestampType.INSTANCE ) );
//noinspection unchecked
register( new AdaptedImmutableType( DbTimestampType.INSTANCE ) );
//noinspection unchecked
register( new AdaptedImmutableType( CalendarType.INSTANCE ) );
//noinspection unchecked
register( new AdaptedImmutableType( CalendarDateType.INSTANCE ) );
//noinspection unchecked
register( new AdaptedImmutableType( BinaryType.INSTANCE ) );
//noinspection unchecked
register( new AdaptedImmutableType( SerializableType.INSTANCE ) );
}
/**
* Constructor version used during shallow copy
*
* @param registeredTypes The type map to copy over
*/
@SuppressWarnings({"UnusedDeclaration"})
private BasicTypeRegistry(Map<String, BasicType> registeredTypes) {
registry.putAll( registeredTypes );
locked = true;
}
// 注册对应的基础类型
public void register(BasicType type) {
register( type, type.getRegistrationKeys() );
}
// 注册对应的基础类型最终实现方法
public void register(BasicType type, String[] keys) {
// 判断是否加锁
if ( locked ) {
throw new HibernateException( "Can not alter TypeRegistry at this time" );
}
// 判断 type 是否为空
if ( type == null ) {
throw new HibernateException( "Type to register cannot be null" );
}
if ( keys == null || keys.length == 0 ) {
LOG.typeDefinedNoRegistrationKeys( type );
return;
}
for ( String key : keys ) {
// be safe...
if ( key == null ) {
continue;
}
//Use String#intern here as there's high chances of duplicates combined with long term usage:
//just running our testsuite would generate 210,000 instances for the String "java.lang.Class" alone.
//Incidentally this might help with map lookup efficiency too.
key = key.intern();
LOG.debugf( "Adding type registration %s -> %s", key, type );
final Type old = registry.put( key, type );
if ( old != null && old != type ) {
LOG.typeRegistrationOverridesPrevious( key, old );
}
}
}
public void register(UserType type, String[] keys) {
register( new CustomType( type, keys ) );
}
public void register(CompositeUserType type, String[] keys) {
register( new CompositeCustomType( type, keys ) );
}
public void unregister(String... keys) {
for ( String key : keys ) {
registry.remove( key );
}
}
public BasicType getRegisteredType(String key) {
return registry.get( key );
}
public BasicTypeRegistry shallowCopy() {
return new BasicTypeRegistry( this.registry );
}
}
从 TypeFactory 中获取 type
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.type;
import java.io.Serializable;
import java.util.Properties;
import org.hibernate.MappingException;
import org.hibernate.boot.registry.classloading.spi.ClassLoaderService;
import org.hibernate.boot.registry.classloading.spi.ClassLoadingException;
import org.hibernate.type.spi.TypeConfiguration;
import org.hibernate.usertype.CompositeUserType;
import org.hibernate.usertype.UserType;
/**
* Acts as the contract for getting types and as the mediator between {@link BasicTypeRegistry} and {@link TypeFactory}.
*
* @author Steve Ebersole
*
* @deprecated (since 5.3) No replacement, access to and handling of Types will be much different in 6.0
*/
@Deprecated
public class TypeResolver implements Serializable {
private final TypeFactory typeFactory;
private final TypeConfiguration typeConfiguration;
public TypeResolver(TypeConfiguration typeConfiguration, TypeFactory typeFactory){
this.typeConfiguration = typeConfiguration;
this.typeFactory = typeFactory;
}
// public TypeResolver() {
// this( new BasicTypeRegistry(), new TypeFactory() );
// }
//
// /**
// * @deprecated (since 5.3)
// */
// @Deprecated
// public TypeResolver(BasicTypeRegistry basicTypeRegistry, TypeFactory typeFactory) {
// this.basicTypeRegistry = basicTypeRegistry;
// this.typeFactory = typeFactory;
// }
// public TypeResolver scope(SessionFactoryImplementor factory) {
// typeFactory.injectSessionFactory( factory );
// return new TypeResolver( basicTypeRegistry.shallowCopy(), typeFactory );
// }
public void registerTypeOverride(BasicType type) {
typeConfiguration.getBasicTypeRegistry().register( type );
}
public void registerTypeOverride(UserType type, String[] keys) {
typeConfiguration.getBasicTypeRegistry().register( type, keys );
}
public void registerTypeOverride(CompositeUserType type, String[] keys) {
typeConfiguration.getBasicTypeRegistry().register( type, keys );
}
public TypeFactory getTypeFactory() {
return typeFactory;
}
/**
* Locate a Hibernate {@linkplain BasicType basic type} given (one of) its registration names.
*
* @param name The registration name
*
* @return The registered type
*/
public BasicType basic(String name) {
return typeConfiguration.getBasicTypeRegistry().getRegisteredType( name );
}
/**
* See {@link #heuristicType(String, Properties)}
*
* @param typeName The name (see heuristic algorithm discussion on {@link #heuristicType(String, Properties)}).
*
* @return The deduced type; may be null.
*
* @throws MappingException Can be thrown from {@link #heuristicType(String, Properties)}
*/
public Type heuristicType(String typeName) throws MappingException {
return heuristicType( typeName, null );
}
/**
* Uses heuristics to deduce the proper {@link Type} given a string naming the type or Java class.
* <p/>
* The search goes as follows:<ol>
* <li>search for a basic type with 'typeName' as a registration key</li>
* <li>
* look for 'typeName' as a class name and<ol>
* <li>if it names a {@link Type} implementor, return an instance</li>
* <li>if it names a {@link CompositeUserType} or a {@link UserType}, return an instance of class wrapped into the appropriate {@link Type} adapter</li>
* <li>if it implements {@link org.hibernate.classic.Lifecycle}, return the corresponding entity type</li>
* <li>if it implements {@link Serializable}, return the corresponding serializable type</li>
* </ol>
* </li>
* </ol>
*
* @param typeName The name (see heuristic algorithm above).
* @param parameters Any parameters for the type. Only applied if built!
*
* @return The deduced type; may be null.
*
* @throws MappingException Indicates a problem attempting to resolve 'typeName' as a {@link Class}
*/
// 核心代码
public Type heuristicType(String typeName, Properties parameters) throws MappingException {
// 如果为 basicType,z则直接获取
Type type = basic( typeName );
if ( type != null ) {
return type;
}
try {
// 如果Basic中未获取到，通过反射加载Type
final ClassLoaderService classLoaderService = typeConfiguration.getServiceRegistry().getService( ClassLoaderService.class );
Class typeClass = classLoaderService.classForName( typeName );
if ( typeClass != null ) {
return typeFactory.byClass( typeClass, parameters );
}
}
catch ( ClassLoadingException ignore ) {
}
return null;
}
}