BAEL-1596 Spring Events (#5605)

* Annotation-driven event listener + generic events

* update examples + add tests

* add article link

* add more tests for Spring Events
This commit is contained in:
Paul 2018-11-09 16:35:44 +03:00 committed by Eugen
parent 064113f939
commit 8e6fff4fc8
12 changed files with 214 additions and 5 deletions

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@ -5,9 +5,11 @@
This project is used to replicate Spring Exceptions only. This project is used to replicate Spring Exceptions only.
### The Course ### The Course
The "REST With Spring" Classes: http://bit.ly/restwithspring The "REST With Spring" Classes: http://bit.ly/restwithspring
### Relevant articles: ### Relevant articles:
- [Guide to Spring @Autowired](http://www.baeldung.com/spring-autowire) - [Guide to Spring @Autowired](http://www.baeldung.com/spring-autowire)
- [Properties with Spring](http://www.baeldung.com/properties-with-spring) - checkout the `org.baeldung.properties` package for all scenarios of properties injection and usage - [Properties with Spring](http://www.baeldung.com/properties-with-spring) - checkout the `org.baeldung.properties` package for all scenarios of properties injection and usage
- [Spring Profiles](http://www.baeldung.com/spring-profiles) - [Spring Profiles](http://www.baeldung.com/spring-profiles)
@ -30,3 +32,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
- [Spring Web Contexts](http://www.baeldung.com/spring-web-contexts) - [Spring Web Contexts](http://www.baeldung.com/spring-web-contexts)
- [Spring Cache Creating a Custom KeyGenerator](http://www.baeldung.com/spring-cache-custom-keygenerator) - [Spring Cache Creating a Custom KeyGenerator](http://www.baeldung.com/spring-cache-custom-keygenerator)
- [Spring @Primary Annotation](http://www.baeldung.com/spring-primary) - [Spring @Primary Annotation](http://www.baeldung.com/spring-primary)
- [Spring Events](https://www.baeldung.com/spring-events)

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@ -0,0 +1,46 @@
package org.baeldung.springevents.synchronous;
import org.springframework.context.event.ContextStartedEvent;
import org.springframework.context.event.EventListener;
import org.springframework.stereotype.Component;
import org.springframework.transaction.event.TransactionPhase;
import org.springframework.transaction.event.TransactionalEventListener;
@Component
public class AnnotationDrivenEventListener {
// for tests
private boolean hitContextStartedHandler = false;
private boolean hitSuccessfulEventHandler = false;
private boolean hitCustomEventHandler = false;
@EventListener
public void handleContextStart(final ContextStartedEvent cse) {
System.out.println("Handling context started event.");
hitContextStartedHandler = true;
}
@EventListener(condition = "#event.success")
public void handleSuccessful(final GenericSpringEvent<String> event) {
System.out.println("Handling generic event (conditional): " + event.getWhat());
hitSuccessfulEventHandler = true;
}
@TransactionalEventListener(phase = TransactionPhase.BEFORE_COMMIT)
public void handleCustom(final CustomSpringEvent event) {
System.out.println("Handling event inside a transaction BEFORE COMMIT.");
hitCustomEventHandler = true;
}
boolean isHitContextStartedHandler() {
return hitContextStartedHandler;
}
boolean isHitSuccessfulEventHandler() {
return hitSuccessfulEventHandler;
}
boolean isHitCustomEventHandler() {
return hitCustomEventHandler;
}
}

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@ -7,9 +7,16 @@ import org.springframework.stereotype.Component;
@Component @Component
public class ContextRefreshedListener implements ApplicationListener<ContextRefreshedEvent> { public class ContextRefreshedListener implements ApplicationListener<ContextRefreshedEvent> {
// for tests
private boolean hitContextRefreshedHandler = false;
@Override @Override
public void onApplicationEvent(final ContextRefreshedEvent cse) { public void onApplicationEvent(final ContextRefreshedEvent cse) {
System.out.println("Handling context re-freshed event. "); System.out.println("Handling context re-freshed event. ");
hitContextRefreshedHandler = true;
} }
boolean isHitContextRefreshedHandler() {
return hitContextRefreshedHandler;
}
} }

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@ -16,4 +16,16 @@ public class CustomSpringEventPublisher {
applicationEventPublisher.publishEvent(customSpringEvent); applicationEventPublisher.publishEvent(customSpringEvent);
} }
public void publishGenericEvent(final String message, boolean success) {
System.out.println("Publishing generic event.");
final GenericSpringEvent<String> genericSpringEvent = new GenericStringSpringEvent(message, success);
applicationEventPublisher.publishEvent(genericSpringEvent);
}
public void publishGenericAppEvent(final String message) {
System.out.println("Publishing generic event.");
final GenericSpringAppEvent<String> genericSpringEvent = new GenericStringSpringAppEvent(this, message);
applicationEventPublisher.publishEvent(genericSpringEvent);
}
} }

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@ -0,0 +1,18 @@
package org.baeldung.springevents.synchronous;
import org.springframework.context.ApplicationEvent;
public class GenericSpringAppEvent<T> extends ApplicationEvent {
private final T what;
public GenericSpringAppEvent(final Object source, final T what) {
super(source);
this.what = what;
}
public T getWhat() {
return what;
}
}

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@ -0,0 +1,21 @@
package org.baeldung.springevents.synchronous;
public class GenericSpringEvent<T> {
private final T what;
protected final boolean success;
public GenericSpringEvent(final T what, final boolean success) {
this.what = what;
this.success = success;
}
public T getWhat() {
return what;
}
public boolean isSuccess() {
return success;
}
}

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@ -0,0 +1,22 @@
package org.baeldung.springevents.synchronous;
import org.springframework.context.ApplicationListener;
import org.springframework.lang.NonNull;
import org.springframework.stereotype.Component;
@Component
public class GenericSpringEventListener implements ApplicationListener<GenericSpringAppEvent<String>> {
// for testing
private boolean hitEventHandler = false;
@Override
public void onApplicationEvent(@NonNull final GenericSpringAppEvent<String> event) {
System.out.println("Received spring generic event - " + event.getWhat());
hitEventHandler = true;
}
boolean isHitEventHandler() {
return hitEventHandler;
}
}

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@ -0,0 +1,9 @@
package org.baeldung.springevents.synchronous;
class GenericStringSpringAppEvent extends GenericSpringAppEvent<String> {
GenericStringSpringAppEvent(final Object source, final String what) {
super(source, what);
}
}

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@ -0,0 +1,9 @@
package org.baeldung.springevents.synchronous;
public class GenericStringSpringEvent extends GenericSpringEvent<String> {
GenericStringSpringEvent(final String what, final boolean success) {
super(what, success);
}
}

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@ -3,16 +3,23 @@ package org.baeldung.springevents.synchronous;
import org.baeldung.springevents.synchronous.SynchronousSpringEventsConfig; import org.baeldung.springevents.synchronous.SynchronousSpringEventsConfig;
import org.junit.Test; import org.junit.Test;
import org.junit.runner.RunWith; import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.support.AnnotationConfigContextLoader; import org.springframework.test.context.support.AnnotationConfigContextLoader;
import static org.springframework.util.Assert.isTrue;
@RunWith(SpringJUnit4ClassRunner.class) @RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = { SynchronousSpringEventsConfig.class }, loader = AnnotationConfigContextLoader.class) @ContextConfiguration(classes = { SynchronousSpringEventsConfig.class }, loader = AnnotationConfigContextLoader.class)
public class ContextRefreshedListenerIntegrationTest { public class ContextRefreshedListenerIntegrationTest {
@Autowired
private ContextRefreshedListener listener;
@Test @Test
public void testContextRefreshedListener() throws InterruptedException { public void testContextRefreshedListener() {
System.out.println("Test context re-freshed listener."); System.out.println("Test context re-freshed listener.");
isTrue(listener.isHitContextRefreshedHandler(), "Refresh should be called once");
} }
} }

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@ -0,0 +1,28 @@
package org.baeldung.springevents.synchronous;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.support.AnnotationConfigContextLoader;
import static org.springframework.util.Assert.isTrue;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = { SynchronousSpringEventsConfig.class }, loader = AnnotationConfigContextLoader.class)
public class GenericAppEventListenerIntegrationTest {
@Autowired
private CustomSpringEventPublisher publisher;
@Autowired
private GenericSpringEventListener listener;
@Test
public void testGenericSpringEvent() {
isTrue(!listener.isHitEventHandler(), "The initial value should be false");
publisher.publishGenericAppEvent("Hello world!!!");
isTrue(listener.isHitEventHandler(), "Now the value should be changed to true");
}
}

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@ -1,5 +1,6 @@
package org.baeldung.springevents.synchronous; package org.baeldung.springevents.synchronous;
import org.junit.Ignore;
import org.junit.Test; import org.junit.Test;
import org.junit.runner.RunWith; import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Autowired;
@ -7,16 +8,42 @@ import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.support.AnnotationConfigContextLoader; import org.springframework.test.context.support.AnnotationConfigContextLoader;
import static org.springframework.util.Assert.isTrue;
@RunWith(SpringJUnit4ClassRunner.class) @RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = { SynchronousSpringEventsConfig.class }, loader = AnnotationConfigContextLoader.class) @ContextConfiguration(classes = { SynchronousSpringEventsConfig.class }, loader = AnnotationConfigContextLoader.class)
public class SynchronousCustomSpringEventsIntegrationTest { public class SynchronousCustomSpringEventsIntegrationTest {
@Autowired @Autowired
private CustomSpringEventPublisher publisher; private CustomSpringEventPublisher publisher;
@Autowired
private AnnotationDrivenEventListener listener;
@Test @Test
public void testCustomSpringEvents() throws InterruptedException { public void testCustomSpringEvents() {
isTrue(!listener.isHitCustomEventHandler(), "The value should be false");
publisher.publishEvent("Hello world!!"); publisher.publishEvent("Hello world!!");
System.out.println("Done publishing synchronous custom event. "); System.out.println("Done publishing synchronous custom event. ");
isTrue(listener.isHitCustomEventHandler(), "Now the value should be changed to true");
}
@Test
public void testGenericSpringEvent() {
isTrue(!listener.isHitSuccessfulEventHandler(), "The initial value should be false");
publisher.publishGenericEvent("Hello world!!!", true);
isTrue(listener.isHitSuccessfulEventHandler(), "Now the value should be changed to true");
}
@Test
public void testGenericSpringEventNotProcessed() {
isTrue(!listener.isHitSuccessfulEventHandler(), "The initial value should be false");
publisher.publishGenericEvent("Hello world!!!", false);
isTrue(!listener.isHitSuccessfulEventHandler(), "The value should still be false");
}
@Ignore("fix me")
@Test
public void testContextStartedEvent() {
isTrue(listener.isHitContextStartedHandler(), "Start should be called once");
} }
} }