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There is a newer version: 1.5.0

package cn.hippo4j.common.design.observer;

import cn.hippo4j.common.toolkit.CollectionUtil;
import cn.hippo4j.common.toolkit.StringUtil;
import lombok.extern.slf4j.Slf4j;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Send observer notification.
 *
 * @author chen.ma
 * @date 2021/12/25 19:47
 */
@Slf4j
public class AbstractSubjectCenter {

    private static final Map> OBSERVERS_MAP = new ConcurrentHashMap();

    /**
     * Register observer.
     *
     * @param observer
     */
    public static void register(Observer observer) {
        register(SubjectType.SPRING_CONTENT_REFRESHED.name(), observer);
    }

    /**
     * Register observer.
     *
     * @param subject
     * @param observer
     */
    public static void register(String subject, Observer observer) {
        if (StringUtil.isBlank(subject) || observer == null) {
            log.warn("Register observer. A string whose subject or observer is empty or empty.");
            return;
        }

        List observers = OBSERVERS_MAP.get(subject);
        if (CollectionUtil.isEmpty(observers)) {
            observers = new ArrayList();
        }

        observers.add(observer);
        OBSERVERS_MAP.put(subject, observers);
    }

    /**
     * Remove observer.
     *
     * @param observer
     */
    public static void remove(Observer observer) {
        remove(SubjectType.SPRING_CONTENT_REFRESHED.name(), observer);
    }

    /**
     * Remove observer.
     *
     * @param subject
     * @param observer
     */
    public static void remove(String subject, Observer observer) {
        List observers;
        if (StringUtil.isBlank(subject) || CollectionUtil.isEmpty((observers = OBSERVERS_MAP.get(subject))) || observer == null) {
            log.warn("Remove observer. A string whose subject or observer is empty or empty.");
            return;
        }

        observers.remove(observer);
    }

    public static void notify(String subject, ObserverMessage observerMessage) {
        List observers = OBSERVERS_MAP.get(subject);
        if (CollectionUtil.isEmpty(observers)) {
            log.warn("Under the subject, there is no observer group.");
            return;
        }

        observers.parallelStream().forEach(each -> {
            try {
                each.accept(observerMessage);
            } catch (Exception ex) {
                log.error("Notification subject :: {} observer exception", subject);
            }
        });
    }

    private enum SubjectType {

        /**
         * Spring content refreshed.
         */
        SPRING_CONTENT_REFRESHED

    }

}