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OptimisticLockingOneRootEntityMultipleVersionsTest.java
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OptimisticLockingOneRootEntityMultipleVersionsTest.java
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package com.vladmihalcea.hibernate.masterclass.laboratory.concurrency;
import com.vladmihalcea.hibernate.masterclass.laboratory.util.AbstractTest;
import org.hamcrest.core.IsInstanceOf;
import org.hibernate.Session;
import org.hibernate.StaleObjectStateException;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import javax.persistence.*;
import java.math.BigDecimal;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.*;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.core.IsEqual.equalTo;
/**
* EntityOptimisticLockingHighUpdateRateSingleEntityTest - Test to check optimistic checking on a single entity being updated by many threads
*
* @author Vlad Mihalcea
*/
public class OptimisticLockingOneRootEntityMultipleVersionsTest extends AbstractTest {
private ExecutorService executorService = Executors.newFixedThreadPool(10);
private Product originalProduct;
@Before
public void addProduct(){
originalProduct = doInTransaction(new TransactionCallable<Product>() {
@Override
public Product execute(Session session) {
Product product = Product.newInstance();
product.setId(1L);
product.setName("TV");
product.setDescription("Plasma TV");
product.setPrice(BigDecimal.valueOf(199.99));
product.setQuantity(7L);
session.persist(product);
return product;
}
});
}
@Rule
public ExpectedException expectedException = ExpectedException.none();
static interface DoWithProduct{
void with(Product product);
}
public static class ModifyQuantity implements DoWithProduct{
private final Long newQuantity;
public ModifyQuantity(Long newQuantity) {
this.newQuantity = newQuantity;
}
public void with(Product product) {
product.setQuantity(newQuantity);
}
}
public static class ModifyDescription implements DoWithProduct{
private final String newDesc;
public ModifyDescription(String newDesc) {
this.newDesc = newDesc;
}
public void with(Product product) {
product.setDescription(newDesc);
}
}
public static class IncLikes implements DoWithProduct{
public void with(Product product) {
product.incrementLikes();
}
}
public class TransactionTemplate implements Callable<Void> {
private final DoWithProduct doWithProduct;
private CyclicBarrier barrier;
public TransactionTemplate(DoWithProduct doWithProduct, CyclicBarrier barrier) {
this.doWithProduct = doWithProduct;
this.barrier = barrier;
}
public Void call() {
doInTransaction(new TransactionCallable<Void>() {
@Override
public Void execute(Session session) {
try {
Product product = (Product) session.get(Product.class, 1L);
barrier.await();
doWithProduct.with(product);
return null;
} catch (InterruptedException e) {
throw new IllegalStateException(e);
} catch (BrokenBarrierException e) {
throw new IllegalStateException(e);
}
}
});
return null;
}
}
public Product getProductById(final long productId) {
return doInTransaction(new TransactionCallable<Product>() {
@Override
public Product execute(Session session) {
return (Product) session.get(Product.class, productId);
}
});
}
@Test
public void canConcurrentlyModifyEachOfSubEntities() throws InterruptedException, ExecutionException {
executeOperations(
new IncLikes(),
new ModifyDescription("Plasma HDTV"),
new ModifyQuantity(1000L));
Product modifiedProduct= getProductById(originalProduct.getId());
assertThat(modifiedProduct.getDescription(), equalTo("Plasma HDTV"));
assertThat(modifiedProduct.getQuantity(), equalTo(1000L));
assertThat(modifiedProduct.getLikes(), equalTo(originalProduct.getLikes() + 1));
}
@Test
public void optimisticLockingViolationForConcurrentStockModifications() throws InterruptedException, ExecutionException {
expectedException.expectCause(IsInstanceOf.<Throwable>instanceOf(StaleObjectStateException.class));
executeOperations(
new IncLikes(),
new ModifyQuantity(100L),
new ModifyDescription("Plasma HDTV"),
new ModifyQuantity(1000L));
}
@Test
public void optimisticLockingViolationForConcurrentProductModifications() throws InterruptedException, ExecutionException {
expectedException.expectCause(IsInstanceOf.<Throwable>instanceOf(StaleObjectStateException.class));
executeOperations(
new IncLikes(),
new ModifyDescription("LCD TV"),
new ModifyDescription("Plasma HDTV"),
new ModifyQuantity(1L));
}
@Test
public void optimisticLockingViolationForConcurrentLikeModifications() throws InterruptedException, ExecutionException {
expectedException.expectCause(IsInstanceOf.<Throwable>instanceOf(StaleObjectStateException.class));
executeOperations(
new IncLikes(),
new IncLikes(),
new ModifyDescription("Plasma HDTV"),
new ModifyQuantity(2L));
}
private void executeOperations(DoWithProduct... operations) throws InterruptedException, ExecutionException {
CyclicBarrier cyclicBarrier = new CyclicBarrier(operations.length);
List<TransactionTemplate> tasks = new LinkedList<TransactionTemplate>();
for (DoWithProduct operation : operations) {
tasks.add(new TransactionTemplate(operation, cyclicBarrier));
}
List<Future<Void>> futures = executorService.invokeAll(tasks);
for (Future<Void> future : futures) {
future.get();
}
}
@Override
protected Class<?>[] entities() {
return new Class<?>[]{
Product.class,
ProductStock.class,
ProductLiking.class
};
}
/**
* ProductStock - Product Stock
*
* @author Vlad Mihalcea
*/
@Entity(name = "ProductStock")
@Table(name = "product_stock")
public static class ProductStock {
@Id
private Long id;
@MapsId
@OneToOne
private Product product;
private long quantity;
@Version
private int version;
public Long getId() {
return id;
}
public Product getProduct() {
return product;
}
public void setProduct(Product product) {
this.product = product;
}
public long getQuantity() {
return quantity;
}
public void setQuantity(long quantity) {
this.quantity = quantity;
}
}
/**
* ProductStock - Product Stock
*
* @author Vlad Mihalcea
*/
@Entity(name = "ProductLiking")
@Table(name = "product_liking")
public static class ProductLiking {
@Id
private Long id;
@MapsId
@OneToOne
private Product product;
private int likes;
@Version
private int version;
public Long getId() {
return id;
}
public Product getProduct() {
return product;
}
public void setProduct(Product product) {
this.product = product;
}
public int getLikes() {
return likes;
}
public int incrementLikes() {
return ++likes;
}
}
/**
* Product - Product
*
* @author Vlad Mihalcea
*/
@Entity(name = "Product")
@Table(name = "product")
public static class Product {
public static Product newInstance() {
Product product = new Product();
ProductStock stock = new ProductStock();
stock.setProduct(product);
product.stock = stock;
ProductLiking liking = new ProductLiking();
liking.setProduct(product);
product.liking = liking;
return product;
}
@Id
private Long id;
@Column(unique = true, nullable = false)
private String name;
@Column(nullable = false)
private String description;
@Column(nullable = false)
private BigDecimal price;
@OneToOne(optional = false, mappedBy = "product", cascade = CascadeType.ALL, orphanRemoval = true)
@PrimaryKeyJoinColumn
private ProductStock stock;
@OneToOne(optional = false, mappedBy = "product", cascade = CascadeType.ALL, orphanRemoval = true)
@PrimaryKeyJoinColumn
private ProductLiking liking;
@Version
private int version;
public Product() {
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public BigDecimal getPrice() {
return price;
}
public void setPrice(BigDecimal price) {
this.price = price;
}
public long getQuantity() {
return stock.getQuantity();
}
public void setQuantity(long quantity) {
stock.setQuantity(quantity);
}
public int getLikes() {
return liking.getLikes();
}
public int incrementLikes() {
return liking.incrementLikes();
}
}
}