自定义RxBus，RxManager with RxJava2

﹏ヽ暗。殇╰゛Y 2022-09-29 01:31 150阅读 0赞

现在查到的关于RxBus, RxManager的封装大部分是基于RxJava1的，从RxJava1到RxJava2的变化很大，很难平滑地过度，所以自己根据RxJava2重新封装下RxBus和RxManager

RxBus.java

public class RxBus {
    
            private static RxBus instance;
    
            /**
             * ConcurrentHashMap: 线程安全集合
             *   Subject 同时充当了Observer和Observable的角色
             */
            @SuppressWarnings("rawtypes")
            private ConcurrentHashMap<Object, List<Subject>> subjectMapper = new ConcurrentHashMap<>();
    
    
            public static synchronized RxBus getInstance() {
                if(null == instance) {
                    instance = new RxBus();
                }
                return instance;
            }
    
            private RxBus() {
            }
    
            /**
             * 订阅事件源
             *
             * @param observable
             * @param consumer
             * @return
             */
            public RxBus onEvent(Observable<?> observable, Consumer<Object> consumer) {
                observable.observeOn(AndroidSchedulers.mainThread())
                        .subscribe(consumer, new Consumer<Throwable>() {
                            @Override
                            public void accept(Throwable throwable) throws Exception {
                                throwable.printStackTrace();
                            }
                        });
                return getInstance();
            }
    
    
            /**
             * 注册事件源
             *
             * @param tag key
             * @param <T>
             * @return
             */
            @SuppressWarnings({"rawtypes"})
            public <T> Observable<T> register(@NonNull Object tag) {
                List<Subject> subjectList = subjectMapper.get(tag);
                if(null == subjectList) {
                    subjectList = new ArrayList<>();
                    subjectMapper.put(tag, subjectList);
                }
    
                Subject<T> subject = PublishSubject.create();
                subjectList.add(subject);
                // LogUtil.log("register" + tag + " size:" + subjectList.size());
                return subject;
            }
    
            /**
             * 取消整个tag的监听
             *
             * @param tag key
             */
            @SuppressWarnings("rawtypes")
            public void unregister(@NonNull Object tag) {
                List<Subject> subjectList = subjectMapper.get(tag);
                if(null != subjectList) {
                    subjectMapper.remove(tag);
                }
            }
    
            /**
             * 取消tag里某个observable的监听
             *
             * @param tag key
             * @param observable 要删除的observable
             * @return
             */
            @SuppressWarnings("rawtypes")
            public RxBus unregister(@NonNull Object tag,
                                    @NonNull Observable<?> observable) {
                if(null == observable) {
                    return getInstance();
                }
    
                List<Subject> subjectList = subjectMapper.get(tag);
                if(null != subjectList) {
                    // 从subjectList中删去observable
                    subjectList.remove((Subject<?>) observable);
                    // 若此时subjectList为空则从subjectMapper中删去
                    if(isEmpty(subjectList)) {
                        subjectMapper.remove(tag);
                    }
                }
                return getInstance();
            }
    
            /**
             * 触发事件
             *
             * @param content
             */
            public void post(@NonNull Object content) {
                post(content.getClass().getName(), content);
            }
    
            /**
             * 触发事件
             *
             * @param tag key
             * @param content
             */
            @SuppressWarnings({"unchecked", "rawtypes"})
            public void post(@NonNull Object tag, @NonNull Object content) {
                List<Subject> subjectList = subjectMapper.get(tag);
                if(!isEmpty(subjectList)) {
                    for(Subject subject : subjectList) {
                        subject.onNext(content);
                    }
                }
            }
    
    
            /**
             * 判断集合是否为空
             *
             * @param collection 集合
             * @return
             */
            @SuppressWarnings("rawtypes")
            public static boolean isEmpty(Collection<Subject> collection) {
                return null == collection || collection.isEmpty();
            }
    
    }

RxManager.java

public class RxManager {
    
        public RxBus mRxBus = RxBus.getInstance();
    
        /**
         * 管理观察源
         */
        private Map<String, Observable<?>> mObservableMap = new HashMap<>();
    
        /**
         * 管理订阅者
         */
        private CompositeDisposable mCompositeSubscription = new CompositeDisposable();
    
    
        public void on(String eventName, Consumer<Object> consumer) {
            // 注册
            Observable<?> mObservable = mRxBus.register(eventName);
    
            mObservableMap.put(eventName, mObservable);
    
            mCompositeSubscription
                    .add(mObservable.observeOn(AndroidSchedulers.mainThread())
                            .subscribe(consumer, new Consumer<Throwable>() {
                                @Override
                                public void accept(Throwable throwable) throws Exception {
                                    throwable.printStackTrace();
                                }
                            }));
    
        }
    
        /**
         * 添加订阅者到mCompositeSubscription
         *
         * @param m 要添加的订阅者
         */
        public void add(Disposable m) {
            mCompositeSubscription.add(m);
        }
    
        /**
         * 取消所有注册
         */
        public void clear() {
            // 取消订阅
            mCompositeSubscription.dispose();
            for(Map.Entry<String, Observable<?>> entry : mObservableMap.entrySet()) {
                // 取消注册
                mRxBus.unregister(entry.getKey(), entry.getValue());
            }
        }
    
        /**
         * 触发事件
         *
         * @param tag
         * @param content
         */
        public void post(Object tag, Object content) {
            mRxBus.post(tag, content);
        }
    
    }