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PR for BAEL-2838 (#6970)

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* Singleton injection examples and tests added

* code and tests implemented

* test refactored
This commit is contained in:
enpy 2019-05-20 06:48:20 +02:00 committed by maibin
parent 0579815b69
commit 60db8a741a
1 changed files with 26 additions and 59 deletions
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85
jee-7/src/test/java/com/baeldung/singleton/CarServiceIntegrationTest.java
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@ -10,6 +10,10 @@ import java.util.Map;
import java.util.UUID; import java.util.UUID;
import javax.ejb.EJB; import javax.ejb.EJB;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.CDI;
import javax.inject.Inject; import javax.inject.Inject;
import org.jboss.arquillian.container.test.api.Deployment; import org.jboss.arquillian.container.test.api.Deployment;
@ -47,68 +51,31 @@ public class CarServiceIntegrationTest {
@EJB @EJB
private CarServiceEjbSingleton carServiceEjbSingleton; private CarServiceEjbSingleton carServiceEjbSingleton;
@Test
public void givenASingleton_whenGetBeanIsCalledTwice_thenTheSameInstanceIsReturned() {
CarServiceSingleton one = getBean(CarServiceSingleton.class);
CarServiceSingleton two = getBean(CarServiceSingleton.class);
assertTrue(one == two);
}
@Test
public void givenAPojo_whenGetBeanIsCalledTwice_thenDifferentInstancesAreReturned() {
CarServiceBean one = getBean(CarServiceBean.class);
CarServiceBean two = getBean(CarServiceBean.class);
assertTrue(one != two);
}
private static Map<String, UUID> idMap = new HashMap<>(); @SuppressWarnings("unchecked")
private <T> T getBean(Class<T> beanClass) {
@Before BeanManager bm = CDI.current().getBeanManager();
public void setUp() { Bean<T> bean = (Bean<T>) bm.getBeans(beanClass).iterator().next();
// populate idMap only on first run CreationalContext<T> ctx = bm.createCreationalContext(bean);
if (idMap.isEmpty()) { return (T) bm.getReference(bean, beanClass, ctx);
LOG.info("setUp::carServiceBean: {}", carServiceBean.getId());
idMap.put("carServiceBeanId", carServiceBean.getId());
LOG.info("setUp::carServiceSingleton: {}", carServiceSingleton.getId());
idMap.put("carServiceSingletonId", carServiceSingleton.getId());
LOG.info("setUp::carServiceEjbSingleton: {}", carServiceEjbSingleton.getId());
idMap.put("carServiceEjbSingletonId", carServiceEjbSingleton.getId());
}
} }
@Test @Test
public void givenRun1_whenGetId_thenSingletonIdEqual() { public void givenCDI_whenConcurrentAccess_thenLockingIsNotProvided() {
int testRun = 1;
assertNotNull(carServiceBean);
assertNotNull(carServiceSingleton);
assertNotNull(carServiceEjbSingleton);
UUID carServiceBeanId = carServiceBean.getId();
assertEquals(idMap.get("carServiceBeanId"), carServiceBeanId);
LOG.info("Test run {}::carServiceBeanId: {}", testRun, carServiceBeanId);
UUID carServiceSingletonId = carServiceSingleton.getId();
assertEquals(idMap.get("carServiceSingletonId"), carServiceSingletonId);
LOG.info("Test run {}::carServiceSingletonId: {}", testRun, carServiceSingletonId);
UUID carServiceEjbSingletonId = carServiceEjbSingleton.getId();
assertEquals(idMap.get("carServiceEjbSingletonId"), carServiceEjbSingletonId);
LOG.info("Test run {}::carServiceEjbSingletonId: {}", testRun, carServiceEjbSingletonId);
}
@Test
public void givenRun2_whenGetId_thenSingletonIdEqual() {
int testRun = 2;
assertNotNull(carServiceBean);
assertNotNull(carServiceSingleton);
assertNotNull(carServiceEjbSingleton);
UUID carServiceBeanId = carServiceBean.getId();
assertNotEquals(idMap.get("carServiceBeanId"), carServiceBeanId);
LOG.info("Test run {}::carServiceBeanId: {}", testRun, carServiceBeanId);
UUID carServiceSingletonId = carServiceSingleton.getId();
assertEquals(idMap.get("carServiceSingletonId"), carServiceSingletonId);
LOG.info("Test run {}::carServiceSingletonId: {}", testRun, carServiceSingletonId);
UUID carServiceEjbSingletonId = carServiceEjbSingleton.getId();
assertEquals(idMap.get("carServiceEjbSingletonId"), carServiceEjbSingletonId);
LOG.info("Test run {}::carServiceEjbSingletonId: {}", testRun, carServiceEjbSingletonId);
}
@Test
public void givenRun3_whenSingleton_thenNoLocking() {
for (int i = 0; i < 10; i++) { for (int i = 0; i < 10; i++) {
new Thread(new Runnable() { new Thread(new Runnable() {
@Override @Override
@ -124,7 +91,7 @@ public class CarServiceIntegrationTest {
} }
@Test @Test
public void givenRun4_whenEjb_thenLocking() { public void givenEJB_whenConcurrentAccess_thenLockingIsProvided() {
for (int i = 0; i < 10; i++) { for (int i = 0; i < 10; i++) {
new Thread(new Runnable() { new Thread(new Runnable() {
@Override @Override