public class PrototypeTest {
@Test
public void test() {
Robot firstRobot = new Robot("Droid#1");
Robot secondRobot = (Robot) firstRobot.clone();
assertTrue("Cloned robot's instance can't be the same as the"
+" source robot instance",
firstRobot != secondRobot);
assertTrue("Cloned robot's name should be '"+firstRobot.getName()+"'"
+" but was '"+secondRobot.getName()+"'",
secondRobot.getName().equals(firstRobot.getName()));
}
}
class Robot implements Cloneable {
private String name;
public Robot(String name) {
this.name = name;
}
public String getName() {
return this.name;
}
protected Object clone() throws CloneNotSupportedException {
return super.clone();
}
}
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"applicationContext-test.xml"})
public class SpringPrototypeTest {
@Autowired
private BeanFactory beanFactory;
@Test
public void test() {
ShoppingCart cart1 = (ShoppingCart) beanFactory.getBean("shoppingCart");
assertTrue("Id of cart1 should be 9 but was "+cart1.getId(),
cart1.getId() == 9);
cart1.setId(100);
ShoppingCart cart2 = (ShoppingCart) beanFactory.getBean("shoppingCart");
assertTrue("Id of cart2 should be 9 but was "+cart2.getId(),
cart2.getId() == 9);
assertTrue("Id of second cart ("+cart2.getId()+") shouldn't be the same as the first one: "+cart1.getId(),
cart1.getId() != cart2.getId());
cart2.setId(cart1.getId());
assertTrue("Now (after cart2.setId(cart1.getId())), the id of second cart ("+cart2.getId()+") should be the same as the first one: "
+cart1.getId(), cart1.getId() == cart2.getId());
assertTrue("Both instance shouldn't be the same", cart1 != cart2);
}
}
public class ObserverTest {
@Test
public void test() {
Observer pageOpener = new PageOpener();
Observer register = new Register();
Button btn = new Button();
btn.addListener(pageOpener);
btn.addListener(register);
btn.clickOn();
assertTrue("Button should be clicked but it wasn't",
btn.wasClicked());
assertTrue("Page opener should be informed about click but it wasn't",
pageOpener.wasInformed());
assertTrue("Register should be informed about click but it wasn't",
register.wasInformed());
}
}
class Button {
private boolean clicked;
private List<observer> listeners;
public List<observer> getListeners() {
if (this.listeners == null) {
this.listeners = new ArrayList<observer>();
}
return this.listeners;
}
public void addListener(Observer observer) {
getListeners().add(observer);
}
public boolean wasClicked() {
return this.clicked;
}
public void clickOn() {
this.clicked = true;
informAll();
}
private void informAll() {
for (Observer observer : getListeners()) {
observer.informAboutEvent();
}
}
}
abstract class Observer {
protected boolean informed;
public void informAboutEvent() {
this.informed = true;
}
public boolean wasInformed() {
return this.informed;
}
}
class PageOpener extends Observer {
@Override
public void informAboutEvent() {
System.out.println("Preparing download of new page");
super.informAboutEvent();
}
}
class Register extends Observer {
@Override
public void informAboutEvent() {
System.out.println("Adding the action to register");
super.informAboutEvent();
}
}
public abstract class AbstractApplicationContext extends DefaultResourceLoader
implements ConfigurableApplicationContext, DisposableBean {
/** Statically specified listeners */
private Set<applicationlistener<?>> applicationListeners = new LinkedHashSet<applicationlistener<?>>();
// some other fields and methods
@Override
public void addApplicationListener(ApplicationListener<?> listener) {
if (this.applicationEventMulticaster != null) {
this.applicationEventMulticaster.addApplicationListener(listener);
}
else {//新版本这里直接咔嚓掉，上面的applicationEventMulticaster一旦为空，就会报错的
this.applicationListeners.add(listener);
}
}
/**
* Return the list of statically specified ApplicationListeners.
*/
public Collection<applicationlistener<?>> getApplicationListeners() {
return this.applicationListeners;
}
/**
* Add beans that implement ApplicationListener as listeners.
* Doesn't affect other listeners, which can be added without being beans.
*/
protected void registerListeners() {
// Register statically specified listeners first.
for (ApplicationListener<?> listener : getApplicationListeners()) {
getApplicationEventMulticaster().addApplicationListener(listener);
}
// Do not initialize FactoryBeans here: We need to leave all regular beans
// uninitialized to let post-processors apply to them!
String[] listenerBeanNames = getBeanNamesForType(ApplicationListener.class, true, false);
for (String lisName : listenerBeanNames) {
getApplicationEventMulticaster().addApplicationListenerBean(lisName);
}
}
}
public class SimpleApplicationEventMulticaster extends AbstractApplicationEventMulticaster {
private Executor taskExecutor;
private ErrorHandler errorHandler;
public SimpleApplicationEventMulticaster() {
}
public SimpleApplicationEventMulticaster(BeanFactory beanFactory) {
this.setBeanFactory(beanFactory);
}
public void setTaskExecutor(Executor taskExecutor) {
this.taskExecutor = taskExecutor;
}
protected Executor getTaskExecutor() {
return this.taskExecutor;
}
public void setErrorHandler(ErrorHandler errorHandler) {
this.errorHandler = errorHandler;
}
protected ErrorHandler getErrorHandler() {
return this.errorHandler;
}
public void multicastEvent(ApplicationEvent event) {
this.multicastEvent(event, this.resolveDefaultEventType(event));
}
//发布事件:通过池执行任务的方式来做并发处理，这样就把之前的对象池模式给利用上了
public void multicastEvent(final ApplicationEvent event, ResolvableType eventType) {
ResolvableType type = eventType != null?eventType:this.resolveDefaultEventType(event);
Iterator var4 = this.getApplicationListeners(event, type).iterator();
while(var4.hasNext()) {
final ApplicationListener<?> listener = (ApplicationListener)var4.next();
Executor executor = this.getTaskExecutor();
if(executor != null) {
executor.execute(new Runnable() {
public void run() {
SimpleApplicationEventMulticaster.this.invokeListener(listener, event);
}
});
} else {
this.invokeListener(listener, event);
}
}
}
...
}