HHH-13633 : Added more tests based on renamed original (w/ and w/o bytecode enhancement)

This commit is contained in:
Gail Badner 2019-09-19 23:06:14 -07:00
parent 1d8f93ca64
commit 9ad427a33e
3 changed files with 673 additions and 4 deletions

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@ -19,6 +19,7 @@ import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import org.hibernate.Hibernate;
import org.hibernate.ScrollMode;
import org.hibernate.ScrollableResults;
import org.hibernate.Session;
@ -47,11 +48,10 @@ import static org.hamcrest.MatcherAssert.assertThat;
* @author Andrea Boriero
*/
@RunWith(BytecodeEnhancerRunner.class)
public class QueryScrollinWithInheritanceTest extends BaseNonConfigCoreFunctionalTestCase {
public class QueryScrollingWithInheritanceTest extends BaseNonConfigCoreFunctionalTestCase {
@Override
protected void configureStandardServiceRegistryBuilder(StandardServiceRegistryBuilder ssrb) {
super.configureStandardServiceRegistryBuilder( ssrb );
ssrb.applySetting( AvailableSettings.ALLOW_ENHANCEMENT_AS_PROXY, "true" );
}
@Override
@ -96,7 +96,19 @@ public class QueryScrollinWithInheritanceTest extends BaseNonConfigCoreFunctiona
}
while ( scrollableResults.next() ) {
scrollableResults.get( 0 );
final Employee employee = (Employee) scrollableResults.get( 0 );
assertThat( Hibernate.isPropertyInitialized( employee, "otherEntities" ), is( true ) );
assertThat( Hibernate.isInitialized( employee.getOtherEntities() ), is( true ) );
if ( "ENG1".equals( employee.getDept() ) ) {
assertThat( employee.getOtherEntities().size(), is( 2 ) );
for ( OtherEntity otherEntity : employee.getOtherEntities() ) {
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employee" ), is( false ) );
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employeeParent" ), is( false ) );
}
}
else {
assertThat( employee.getOtherEntities().size(), is( 0 ) );
}
}
statelessSession.getTransaction().commit();
assertThat( stats.getPrepareStatementCount(), is( 1L ) );
@ -138,7 +150,19 @@ public class QueryScrollinWithInheritanceTest extends BaseNonConfigCoreFunctiona
}
while ( scrollableResults.next() ) {
scrollableResults.get( 0 );
final Employee employee = (Employee) scrollableResults.get( 0 );
assertThat( Hibernate.isPropertyInitialized( employee, "otherEntities" ), is( true ) );
assertThat( Hibernate.isInitialized( employee.getOtherEntities() ), is( true ) );
if ( "ENG1".equals( employee.getDept() ) ) {
assertThat( employee.getOtherEntities().size(), is( 2 ) );
for ( OtherEntity otherEntity : employee.getOtherEntities() ) {
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employee" ), is( false ) );
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employeeParent" ), is( false ) );
}
}
else {
assertThat( employee.getOtherEntities().size(), is( 0 ) );
}
}
session.getTransaction().commit();
assertThat( stats.getPrepareStatementCount(), is( 1L ) );

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@ -0,0 +1,327 @@
/*
* 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.test.bytecode.enhancement.lazy.proxy;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import org.hibernate.Hibernate;
import org.hibernate.ScrollMode;
import org.hibernate.ScrollableResults;
import org.hibernate.Session;
import org.hibernate.StatelessSession;
import org.hibernate.annotations.LazyToOne;
import org.hibernate.annotations.LazyToOneOption;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.SessionFactoryBuilder;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.AvailableSettings;
import org.hibernate.dialect.DB2Dialect;
import org.hibernate.query.Query;
import org.hibernate.stat.spi.StatisticsImplementor;
import org.hibernate.testing.bytecode.enhancement.BytecodeEnhancerRunner;
import org.hibernate.testing.junit4.BaseNonConfigCoreFunctionalTestCase;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;
/**
* @author Andrea Boriero
*/
@RunWith(BytecodeEnhancerRunner.class)
public class QueryScrollingWithInheritanceProxyTest extends BaseNonConfigCoreFunctionalTestCase {
@Override
protected void configureStandardServiceRegistryBuilder(StandardServiceRegistryBuilder ssrb) {
super.configureStandardServiceRegistryBuilder( ssrb );
ssrb.applySetting( AvailableSettings.ALLOW_ENHANCEMENT_AS_PROXY, "true" );
}
@Override
protected void configureSessionFactoryBuilder(SessionFactoryBuilder sfb) {
super.configureSessionFactoryBuilder( sfb );
sfb.applyStatisticsSupport( true );
sfb.applySecondLevelCacheSupport( false );
sfb.applyQueryCacheSupport( false );
}
@Override
protected void applyMetadataSources(MetadataSources sources) {
super.applyMetadataSources( sources );
sources.addAnnotatedClass( EmployeeParent.class );
sources.addAnnotatedClass( Employee.class );
sources.addAnnotatedClass( OtherEntity.class );
}
@Test
public void testScrollableWithStatelessSession() {
final StatisticsImplementor stats = sessionFactory().getStatistics();
stats.clear();
ScrollableResults scrollableResults = null;
final StatelessSession statelessSession = sessionFactory().openStatelessSession();
try {
statelessSession.beginTransaction();
Query<Employee> query = statelessSession.createQuery(
"select distinct e from Employee e left join fetch e.otherEntities",
Employee.class
);
if ( getDialect() instanceof DB2Dialect ) {
/*
FetchingScrollableResultsImp#next() in order to check if the ResultSet is empty calls ResultSet#isBeforeFirst()
but the support for ResultSet#isBeforeFirst() is optional for ResultSets with a result
set type of TYPE_FORWARD_ONLY and db2 does not support it.
*/
scrollableResults = query.scroll( ScrollMode.SCROLL_INSENSITIVE );
}
else {
scrollableResults = query.scroll( ScrollMode.FORWARD_ONLY );
}
while ( scrollableResults.next() ) {
final Employee employee = (Employee) scrollableResults.get( 0 );
assertThat( Hibernate.isPropertyInitialized( employee, "otherEntities" ), is( true ) );
assertThat( Hibernate.isInitialized( employee.getOtherEntities() ), is( true ) );
if ( "ENG1".equals( employee.getDept() ) ) {
assertThat( employee.getOtherEntities().size(), is( 2 ) );
for ( OtherEntity otherEntity : employee.getOtherEntities() ) {
if ( "test1".equals( otherEntity.id ) ) {
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employee" ), is( true ) );
assertThat( otherEntity.employee, is( employee ) );
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employeeParent" ), is( true ) );
assertThat( otherEntity.employeeParent, is( employee ) );
}
else {
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employee" ), is( true ) );
assertThat( otherEntity.employee, is( employee ) );
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employeeParent" ), is( true ) );
assertThat( Hibernate.isInitialized( otherEntity.employeeParent ), is( false ) );
}
}
}
else {
assertThat( employee.getOtherEntities().size(), is( 0 ) );
}
}
statelessSession.getTransaction().commit();
assertThat( stats.getPrepareStatementCount(), is( 1L ) );
}
finally {
if ( scrollableResults != null ) {
scrollableResults.close();
}
if ( statelessSession.getTransaction().isActive() ) {
statelessSession.getTransaction().rollback();
}
statelessSession.close();
}
}
@Test
public void testScrollableWithSession() {
final StatisticsImplementor stats = sessionFactory().getStatistics();
stats.clear();
ScrollableResults scrollableResults = null;
final Session session = sessionFactory().openSession();
try {
session.beginTransaction();
Query<Employee> query = session.createQuery(
"select distinct e from Employee e left join fetch e.otherEntities",
Employee.class
);
if ( getDialect() instanceof DB2Dialect ) {
/*
FetchingScrollableResultsImp#next() in order to check if the ResultSet is empty calls ResultSet#isBeforeFirst()
but the support for ResultSet#isBeforeFirst() is optional for ResultSets with a result
set type of TYPE_FORWARD_ONLY and db2 does not support it.
*/
scrollableResults = query.scroll( ScrollMode.SCROLL_INSENSITIVE );
}
else {
scrollableResults = query.scroll( ScrollMode.FORWARD_ONLY );
}
while ( scrollableResults.next() ) {
final Employee employee = (Employee) scrollableResults.get( 0 );
assertThat( Hibernate.isPropertyInitialized( employee, "otherEntities" ), is( true ) );
assertThat( Hibernate.isInitialized( employee.getOtherEntities() ), is( true ) );
if ( "ENG1".equals( employee.getDept() ) ) {
assertThat( employee.getOtherEntities().size(), is( 2 ) );
for ( OtherEntity otherEntity : employee.getOtherEntities() ) {
if ( "test1".equals( otherEntity.id ) ) {
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employee" ), is( true ) );
assertThat( otherEntity.employee, is( employee ) );
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employeeParent" ), is( true ) );
assertThat( otherEntity.employeeParent, is( employee ) );
}
else {
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employee" ), is( true ) );
assertThat( otherEntity.employee, is( employee ) );
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employeeParent" ), is( true ) );
assertThat( Hibernate.isInitialized( otherEntity.employeeParent ), is( false ) );
}
}
}
else {
assertThat( employee.getOtherEntities().size(), is( 0 ) );
}
}
session.getTransaction().commit();
assertThat( stats.getPrepareStatementCount(), is( 1L ) );
}
finally {
if ( scrollableResults != null ) {
scrollableResults.close();
}
if ( session.getTransaction().isActive() ) {
session.getTransaction().rollback();
}
session.close();
}
}
@Before
public void prepareTestData() {
inTransaction(
session -> {
Employee e1 = new Employee( "ENG1" );
Employee e2 = new Employee( "ENG2" );
OtherEntity other1 = new OtherEntity( "test1" );
OtherEntity other2 = new OtherEntity( "test2" );
e1.getOtherEntities().add( other1 );
e1.getOtherEntities().add( other2 );
e1.getParentOtherEntities().add( other1 );
e1.getParentOtherEntities().add( other2 );
other1.employee = e1;
other2.employee = e1;
other1.employeeParent = e1;
other2.employeeParent = e2;
session.persist( other1 );
session.persist( other2 );
session.persist( e1 );
session.persist( e2 );
}
);
}
@After
public void cleanUpTestData() {
inTransaction(
session -> {
session.createQuery( "delete from OtherEntity" ).executeUpdate();
session.createQuery( "delete from Employee" ).executeUpdate();
session.createQuery( "delete from EmployeeParent" ).executeUpdate();
}
);
}
@Entity(name = "EmployeeParent")
@Table(name = "EmployeeParent")
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public static abstract class EmployeeParent {
@Id
private String dept;
@OneToMany(targetEntity = OtherEntity.class, mappedBy = "employeeParent", fetch = FetchType.LAZY)
protected Set<OtherEntity> parentOtherEntities = new HashSet<>();
public Set<OtherEntity> getParentOtherEntities() {
if ( parentOtherEntities == null ) {
parentOtherEntities = new LinkedHashSet();
}
return parentOtherEntities;
}
public void setOtherEntities(Set<OtherEntity> pParentOtherEntites) {
parentOtherEntities = pParentOtherEntites;
}
public String getDept() {
return dept;
}
protected void setDept(String dept) {
this.dept = dept;
}
}
@Entity(name = "Employee")
@Table(name = "Employee")
public static class Employee extends EmployeeParent {
@OneToMany(targetEntity = OtherEntity.class, mappedBy = "employee", fetch = FetchType.LAZY)
protected Set<OtherEntity> otherEntities = new HashSet<>();
public Employee(String dept) {
this();
setDept( dept );
}
protected Employee() {
// this form used by Hibernate
}
public Set<OtherEntity> getOtherEntities() {
if ( otherEntities == null ) {
otherEntities = new LinkedHashSet();
}
return otherEntities;
}
public void setOtherEntities(Set<OtherEntity> pOtherEntites) {
otherEntities = pOtherEntites;
}
}
@Entity(name = "OtherEntity")
@Table(name = "OtherEntity")
public static class OtherEntity {
@Id
private String id;
@ManyToOne(fetch = FetchType.LAZY)
@LazyToOne(LazyToOneOption.NO_PROXY)
@JoinColumn(name = "Employee_Id")
protected Employee employee = null;
@ManyToOne(fetch = FetchType.LAZY)
@LazyToOne(LazyToOneOption.NO_PROXY)
@JoinColumn(name = "EmployeeParent_Id")
protected EmployeeParent employeeParent = null;
protected OtherEntity() {
// this form used by Hibernate
}
public OtherEntity(String id) {
this.id = id;
}
public String getId() {
return id;
}
}
}

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@ -0,0 +1,318 @@
/*
* 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.test.hqlfetchscroll;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import org.hibernate.Hibernate;
import org.hibernate.ScrollMode;
import org.hibernate.ScrollableResults;
import org.hibernate.Session;
import org.hibernate.StatelessSession;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.SessionFactoryBuilder;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.dialect.DB2Dialect;
import org.hibernate.query.Query;
import org.hibernate.stat.spi.StatisticsImplementor;
import org.hibernate.testing.junit4.BaseNonConfigCoreFunctionalTestCase;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;
/**
* @author Andrea Boriero
*/
public class QueryScrollingWithInheritanceTest extends BaseNonConfigCoreFunctionalTestCase {
@Override
protected void configureStandardServiceRegistryBuilder(StandardServiceRegistryBuilder ssrb) {
super.configureStandardServiceRegistryBuilder( ssrb );
}
@Override
protected void configureSessionFactoryBuilder(SessionFactoryBuilder sfb) {
super.configureSessionFactoryBuilder( sfb );
sfb.applyStatisticsSupport( true );
sfb.applySecondLevelCacheSupport( false );
sfb.applyQueryCacheSupport( false );
}
@Override
protected void applyMetadataSources(MetadataSources sources) {
super.applyMetadataSources( sources );
sources.addAnnotatedClass( EmployeeParent.class );
sources.addAnnotatedClass( Employee.class );
sources.addAnnotatedClass( OtherEntity.class );
}
@Test
public void testScrollableWithStatelessSession() {
final StatisticsImplementor stats = sessionFactory().getStatistics();
stats.clear();
ScrollableResults scrollableResults = null;
final StatelessSession statelessSession = sessionFactory().openStatelessSession();
try {
statelessSession.beginTransaction();
Query<Employee> query = statelessSession.createQuery(
"select distinct e from Employee e left join fetch e.otherEntities",
Employee.class
);
if ( getDialect() instanceof DB2Dialect ) {
/*
FetchingScrollableResultsImp#next() in order to check if the ResultSet is empty calls ResultSet#isBeforeFirst()
but the support for ResultSet#isBeforeFirst() is optional for ResultSets with a result
set type of TYPE_FORWARD_ONLY and db2 does not support it.
*/
scrollableResults = query.scroll( ScrollMode.SCROLL_INSENSITIVE );
}
else {
scrollableResults = query.scroll( ScrollMode.FORWARD_ONLY );
}
while ( scrollableResults.next() ) {
final Employee employee = (Employee) scrollableResults.get( 0 );
assertThat( Hibernate.isPropertyInitialized( employee, "otherEntities" ), is( true ) );
assertThat( Hibernate.isInitialized( employee.getOtherEntities() ), is( true ) );
if ( "ENG1".equals( employee.getDept() ) ) {
assertThat( employee.getOtherEntities().size(), is( 2 ) );
for ( OtherEntity otherEntity : employee.getOtherEntities() ) {
if ( "test1".equals( otherEntity.id ) ) {
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employee" ), is( true ) );
assertThat( otherEntity.employee, is( employee ) );
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employeeParent" ), is( true ) );
assertThat( otherEntity.employeeParent, is( employee ) );
}
else {
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employee" ), is( true ) );
assertThat( otherEntity.employee, is( employee ) );
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employeeParent" ), is( true ) );
assertThat( Hibernate.isInitialized( otherEntity.employeeParent ), is( false ) );
}
}
}
else {
assertThat( employee.getOtherEntities().size(), is( 0 ) );
}
}
statelessSession.getTransaction().commit();
assertThat( stats.getPrepareStatementCount(), is( 1L ) );
}
finally {
if ( scrollableResults != null ) {
scrollableResults.close();
}
if ( statelessSession.getTransaction().isActive() ) {
statelessSession.getTransaction().rollback();
}
statelessSession.close();
}
}
@Test
public void testScrollableWithSession() {
final StatisticsImplementor stats = sessionFactory().getStatistics();
stats.clear();
ScrollableResults scrollableResults = null;
final Session session = sessionFactory().openSession();
try {
session.beginTransaction();
Query<Employee> query = session.createQuery(
"select distinct e from Employee e left join fetch e.otherEntities",
Employee.class
);
if ( getDialect() instanceof DB2Dialect ) {
/*
FetchingScrollableResultsImp#next() in order to check if the ResultSet is empty calls ResultSet#isBeforeFirst()
but the support for ResultSet#isBeforeFirst() is optional for ResultSets with a result
set type of TYPE_FORWARD_ONLY and db2 does not support it.
*/
scrollableResults = query.scroll( ScrollMode.SCROLL_INSENSITIVE );
}
else {
scrollableResults = query.scroll( ScrollMode.FORWARD_ONLY );
}
while ( scrollableResults.next() ) {
final Employee employee = (Employee) scrollableResults.get( 0 );
assertThat( Hibernate.isPropertyInitialized( employee, "otherEntities" ), is( true ) );
assertThat( Hibernate.isInitialized( employee.getOtherEntities() ), is( true ) );
if ( "ENG1".equals( employee.getDept() ) ) {
assertThat( employee.getOtherEntities().size(), is( 2 ) );
for ( OtherEntity otherEntity : employee.getOtherEntities() ) {
if ( "test1".equals( otherEntity.id ) ) {
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employee" ), is( true ) );
assertThat( otherEntity.employee, is( employee ) );
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employeeParent" ), is( true ) );
assertThat( otherEntity.employeeParent, is( employee ) );
}
else {
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employee" ), is( true ) );
assertThat( otherEntity.employee, is( employee ) );
assertThat( Hibernate.isPropertyInitialized( otherEntity, "employeeParent" ), is( true ) );
assertThat( Hibernate.isInitialized( otherEntity.employeeParent ), is( false ) );
}
}
}
else {
assertThat( employee.getOtherEntities().size(), is( 0 ) );
}
}
session.getTransaction().commit();
assertThat( stats.getPrepareStatementCount(), is( 1L ) );
}
finally {
if ( scrollableResults != null ) {
scrollableResults.close();
}
if ( session.getTransaction().isActive() ) {
session.getTransaction().rollback();
}
session.close();
}
}
@Before
public void prepareTestData() {
inTransaction(
session -> {
Employee e1 = new Employee( "ENG1" );
Employee e2 = new Employee( "ENG2" );
OtherEntity other1 = new OtherEntity( "test1" );
OtherEntity other2 = new OtherEntity( "test2" );
e1.getOtherEntities().add( other1 );
e1.getOtherEntities().add( other2 );
e1.getParentOtherEntities().add( other1 );
e1.getParentOtherEntities().add( other2 );
other1.employee = e1;
other2.employee = e1;
other1.employeeParent = e1;
other2.employeeParent = e2;
session.persist( other1 );
session.persist( other2 );
session.persist( e1 );
session.persist( e2 );
}
);
}
@After
public void cleanUpTestData() {
inTransaction(
session -> {
session.createQuery( "delete from OtherEntity" ).executeUpdate();
session.createQuery( "delete from Employee" ).executeUpdate();
session.createQuery( "delete from EmployeeParent" ).executeUpdate();
}
);
}
@Entity(name = "EmployeeParent")
@Table(name = "EmployeeParent")
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public static abstract class EmployeeParent {
@Id
private String dept;
@OneToMany(targetEntity = OtherEntity.class, mappedBy = "employeeParent", fetch = FetchType.LAZY)
protected Set<OtherEntity> parentOtherEntities = new HashSet<>();
public Set<OtherEntity> getParentOtherEntities() {
if ( parentOtherEntities == null ) {
parentOtherEntities = new LinkedHashSet();
}
return parentOtherEntities;
}
public void setOtherEntities(Set<OtherEntity> pParentOtherEntites) {
parentOtherEntities = pParentOtherEntites;
}
public String getDept() {
return dept;
}
protected void setDept(String dept) {
this.dept = dept;
}
}
@Entity(name = "Employee")
@Table(name = "Employee")
public static class Employee extends EmployeeParent {
@OneToMany(targetEntity = OtherEntity.class, mappedBy = "employee", fetch = FetchType.LAZY)
protected Set<OtherEntity> otherEntities = new HashSet<>();
public Employee(String dept) {
this();
setDept( dept );
}
protected Employee() {
// this form used by Hibernate
}
public Set<OtherEntity> getOtherEntities() {
if ( otherEntities == null ) {
otherEntities = new LinkedHashSet();
}
return otherEntities;
}
public void setOtherEntities(Set<OtherEntity> pOtherEntites) {
otherEntities = pOtherEntites;
}
}
@Entity(name = "OtherEntity")
@Table(name = "OtherEntity")
public static class OtherEntity {
@Id
private String id;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "Employee_Id")
protected Employee employee = null;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "EmployeeParent_Id")
protected EmployeeParent employeeParent = null;
protected OtherEntity() {
// this form used by Hibernate
}
public OtherEntity(String id) {
this.id = id;
}
public String getId() {
return id;
}
}
}