observer in spring

最新推荐文章于 2025-09-17 19:49:44 发布

原创最新推荐文章于 2025-09-17 19:49:44 发布 · 127 阅读

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本文介绍了一个基于消息服务实现的通知机制。当接收到特定类型的消息时，如订单消息，该服务会调用事件观察者的接收方法进行处理。通过配置文件定义了消息服务与观察者之间的依赖关系。

MessageServiceImpl
if (messageReceived instanceof Order) {
notifyEventObserver(this.orderObservedService, messageReceived);

    public void notifyEventObserver(final List observedService, final Object messageReceived) {
        Iterator iterator = observedService.iterator();
        while (iterator.hasNext()) {
            EventObserver eventObserver = (EventObserver) iterator.next();
            eventObserver.receiveMessage(messageReceived);

public interface EventObserver {
public void receiveMessage(Object receivedObject) throws Exception;

public class OrderProcessingServiceImpl implements OrderProcessingService, EventObserver {
public void receiveMessage(final Object objectReceived) throws Exception {