Android（8）
之前看过EventBus的源码，不是很深入，导致有些模糊，此次仔细阅读了一下，记录笔记，方便以后熟悉。
本篇主要说一下register的过程：
private synchronized void register(Object subscriber, boolean sticky, int priority) {
List&SubscriberMethod& subscriberMethods = subscriberMethodFinder.findSubscriberMethods(subscriber.getClass());
for (SubscriberMethod subscriberMethod : subscriberMethods) {
subscribe(subscriber, subscriberMethod, sticky, priority);
findSubscriberMethods这个方法很长，大致要做的事情就是查找出该类以及其父类中声明的所有方法，根据规则（只能public修饰onEvent开头且只有一个参数）筛选出订阅方法，一起看一下吧，具体就在代码中写说明了，删除了部分代码限制篇幅：
List&SubscriberMethod& findSubscriberMethods(Class&?& subscriberClass) {
subscriberMethods = new ArrayList&SubscriberMethod&();
Class&?& clazz = subscriberC
HashSet&String& eventTypesFound = new HashSet&String&();
StringBuilder methodKeyBuilder = new StringBuilder();
while (clazz != null) {
String name = clazz.getName();
if (name.startsWith("java.") || name.startsWith("javax.") || name.startsWith("android.")) {
Method[] methods = clazz.getDeclaredMethods();
for (Method method : methods) {
String methodName = method.getName();
if (methodName.startsWith(ON_EVENT_METHOD_NAME)) {
int modifiers = method.getModifiers();
if ((modifiers & Modifier.PUBLIC) != 0 && (modifiers & MODIFIERS_IGNORE) == 0) {
Class&?&[] parameterTypes = method.getParameterTypes();
if (parameterTypes.length == 1) {
String modifierString = methodName.substring(ON_EVENT_METHOD_NAME.length());
ThreadMode threadM
if (modifierString.length() == 0) {
threadMode = ThreadMode.PostT
} else if (modifierString.equals("MainThread")) {
threadMode = ThreadMode.MainT
} else if (modifierString.equals("BackgroundThread")) {
threadMode = ThreadMode.BackgroundT
} else if (modifierString.equals("Async")) {
threadMode = ThreadMode.A
Class&?& eventType = parameterTypes[0];
methodKeyBuilder.setLength(0);
methodKeyBuilder.append(methodName).append('&').append(eventType.getName());
String methodKey = methodKeyBuilder.toString();
if (eventTypesFound.add(methodKey)) {
subscriberMethods.add(new SubscriberMethod(method, threadMode, eventType));
} else if (!skipMethodVerificationForClasses.containsKey(clazz)) {
Log.d(EventBus.TAG, "Skipping method (not public, static or abstract): " + clazz + "."
+ methodName);
clazz = clazz.getSuperclass();
接下来看subscribe(subscriber, subscriberMethod, sticky, priority);这个方法是干啥的，总结来说就是把所有事件类型为eventType的订阅者放入List列表中，并放入Map集合中。然后再根据订阅事件的类构造一个订阅事件列表，用来判断某个类是否已经注册过事件,看一下代码：
private void subscribe(Object subscriber, SubscriberMethod subscriberMethod, boolean sticky, int priority) {
Class&?& eventType = subscriberMethod.eventT
CopyOnWriteArrayList&Subscription& subscriptions = subscriptionsByEventType.get(eventType);
Subscription newSubscription = new Subscription(subscriber, subscriberMethod, priority);
if (subscriptions == null) {
subscriptions = new CopyOnWriteArrayList&Subscription&();
subscriptionsByEventType.put(eventType, subscriptions);
if (subscriptions.contains(newSubscription)) {
throw new EventBusException("Subscriber " + subscriber.getClass() + " already registered to event "
+ eventType);
int size = subscriptions.size();
for (int i = 0; i &= i++) {
if (i == size || newSubscription.priority & subscriptions.get(i).priority) {
subscriptions.add(i, newSubscription);
List&Class&?&& subscribedEvents = typesBySubscriber.get(subscriber);
if (subscribedEvents == null) {
subscribedEvents = new ArrayList&Class&?&&();
typesBySubscriber.put(subscriber, subscribedEvents);
subscribedEvents.add(eventType);
if (sticky) {
if (eventInheritance) {
Set&Map.Entry&Class&?&, Object&& entries = stickyEvents.entrySet();
for (Map.Entry&Class&?&, Object& entry : entries) {
Class&?& candidateEventType = entry.getKey();
if (eventType.isAssignableFrom(candidateEventType)) {
Object stickyEvent = entry.getValue();
checkPostStickyEventToSubscription(newSubscription, stickyEvent);
Object stickyEvent = stickyEvents.get(eventType);
checkPostStickyEventToSubscription(newSubscription, stickyEvent);
post某个事件时需要注意的一点是如果你post的事件类型为A，那么所有订阅过A的超类的事件也同样会被触发，时间原因，源码不分析，后续有时间接着写，记此笔记，方便自己查阅！
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哦，抱歉，好像看不到了
现在你可以:
看看其它好友写了什么
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Today on Powersweepstaking Twitter Updates
Recent Posts to this blog
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沪江词库精选subschema description entry是什么意思、英语短语。
中文释义： 【计】 子模式描述体
久卧结石，久卧结石
褥疮，褥疮性溃疡
渐弱-渐强性杂音
2016subschema description entry是什么意思由沪江网提供。【图文】Subscriber Management_百度文库
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