chore(cache): update jcef cache log files
- Updated Extension Scripts log file entries - Modified shared_proto_db metadata log with new entries - Adjusted Site Characteristics Database log content - Refreshed Session Storage log data
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192
src/main/java/com/chuangzhou/vivid2D/events/EventBus.java
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192
src/main/java/com/chuangzhou/vivid2D/events/EventBus.java
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package com.chuangzhou.vivid2D.events;
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import com.axis.innovators.box.events.SubscribeEvent;
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import java.lang.reflect.Method;
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import java.util.*;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.CopyOnWriteArrayList;
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/**
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* 事件总线
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*
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* @author tzdwindows 7
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*/
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public class EventBus {
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private static int maxID = 0;
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private final int busID;
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// 使用线程安全的集合以支持并发环境
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private final Map<Class<?>, List<Subscriber>> eventSubscribers = new ConcurrentHashMap<>();
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private final Map<Object, List<Subscriber>> targetSubscribers = new ConcurrentHashMap<>();
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private volatile boolean shutdown;
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public EventBus() {
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this.busID = maxID++;
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}
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private static class Subscriber implements Comparable<Subscriber> {
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final Object target;
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final Method method;
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final Class<?> eventType;
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final int priority; // 新增优先级字段
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Subscriber(Object target, Method method, Class<?> eventType, int priority) {
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this.target = target;
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this.method = method;
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this.eventType = eventType;
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this.priority = priority;
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}
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@Override
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public int compareTo(Subscriber other) {
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// 按优先级降序排序
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return Integer.compare(other.priority, this.priority);
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}
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}
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/**
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* 注册目标对象的事件监听器
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*
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* @param target 目标对象
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*/
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public void register(Object target) {
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if (targetSubscribers.containsKey(target)) {
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return;
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}
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List<Subscriber> subs = new CopyOnWriteArrayList<>();
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for (Method method : getAnnotatedMethods(target)) {
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SubscribeEvent annotation = method.getAnnotation(SubscribeEvent.class);
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if (annotation == null) {
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continue;
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}
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Class<?>[] paramTypes = method.getParameterTypes();
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if (paramTypes.length != 1) {
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System.err.println("Method " + method.getName() + " has @SubscribeEvent annotation but requires " + paramTypes.length + " parameters. Only one is allowed.");
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continue;
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}
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Class<?> eventType = paramTypes[0];
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// 确保事件参数实现了 Event 接口
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if (!Event.class.isAssignableFrom(eventType)) {
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System.err.println("Method " + method.getName() + " has @SubscribeEvent annotation, but its parameter " + eventType.getName() + " does not implement the Event interface.");
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continue;
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}
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Subscriber sub = new Subscriber(target, method, eventType, annotation.priority());
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// 使用 computeIfAbsent 简化代码并保证线程安全
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List<Subscriber> eventSubs = eventSubscribers.computeIfAbsent(eventType, k -> new CopyOnWriteArrayList<>());
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eventSubs.add(sub);
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// 每次添加后都进行排序，以保证优先级顺序
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Collections.sort(eventSubs);
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subs.add(sub);
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}
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if (!subs.isEmpty()) {
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targetSubscribers.put(target, subs);
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}
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}
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/**
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* 获取目标对象中所有带有 @SubscribeEvent 注解的方法
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*
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* @param target 目标对象
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* @return 方法集合
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*/
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private Set<Method> getAnnotatedMethods(Object target) {
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Set<Method> methods = new HashSet<>();
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Class<?> clazz = target.getClass();
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while (clazz != null) {
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for (Method method : clazz.getDeclaredMethods()) {
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if (method.isAnnotationPresent(SubscribeEvent.class)) {
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methods.add(method);
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}
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}
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clazz = clazz.getSuperclass();
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}
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return methods;
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}
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/**
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* 注销目标对象的事件监听器
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*
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* @param target 目标对象
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*/
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public void unregister(Object target) {
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List<Subscriber> subs = targetSubscribers.remove(target);
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if (subs == null) {
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return;
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}
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for (Subscriber sub : subs) {
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List<Subscriber> eventSubs = eventSubscribers.get(sub.eventType);
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if (eventSubs != null) {
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eventSubs.remove(sub);
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if (eventSubs.isEmpty()) {
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eventSubscribers.remove(sub.eventType);
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}
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}
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}
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}
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/**
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* 发布事件
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*
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* @param event 事件对象，必须实现 Event 接口
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* @return 返回一个 PostResult 对象，其中包含事件是否被取消的状态
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*/
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public PostResult post(Event event) {
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if (shutdown) {
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return new PostResult(event.isCancelled(), null);
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}
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Class<?> eventType = event.getClass();
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List<Subscriber> subs = eventSubscribers.get(eventType);
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if (subs == null || subs.isEmpty()) {
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return new PostResult(false, null);
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}
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for (Subscriber sub : subs) {
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try {
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// 无需再创建副本，因为我们使用了 CopyOnWriteArrayList
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sub.method.setAccessible(true);
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sub.method.invoke(sub.target, event);
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// 如果事件被任何一个订阅者取消，则立即停止分发
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if (event.isCancelled()) {
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break;
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}
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} catch (Exception e) {
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handleException(event, sub, e);
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}
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}
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// 默认返回一个空的 Map，您可以根据需要进行修改
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Map<String, Boolean> additionalInfo = new HashMap<>();
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return new PostResult(event.isCancelled(), additionalInfo);
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}
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/**
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* 关闭事件总线，停止处理事件
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*/
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public void shutdown() {
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shutdown = true;
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eventSubscribers.clear();
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targetSubscribers.clear();
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}
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/**
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* 处理事件处理过程中出现的异常
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*
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* @param event 事件
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* @param subscriber 发生异常的订阅者
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* @param e 异常
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*/
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private void handleException(Event event, Subscriber subscriber, Exception e) {
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System.err.println("Exception thrown by subscriber " + subscriber.target.getClass().getName() +
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"#" + subscriber.method.getName() + " when handling event " + event.getClass().getName());
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e.printStackTrace();
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}
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}
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