package org.dromara.common.sse.core;
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import cn.hutool.core.collection.CollUtil;
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import lombok.extern.slf4j.Slf4j;
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import org.dromara.common.redis.utils.RedisUtils;
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import org.dromara.common.sse.dto.SseMessageDto;
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import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.function.Consumer;
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@Slf4j
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public class SseEmitterManager {
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/**
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* 订阅的频道
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*/
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private final static String SSE_TOPIC = "global:sse";
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private final static Map<Long, Map<String, SseEmitter>> USER_TOKEN_EMITTERS = new ConcurrentHashMap<>();
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public SseEmitter connect(Long userId, String token) {
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Map<String, SseEmitter> emitters = USER_TOKEN_EMITTERS.computeIfAbsent(userId, k -> new ConcurrentHashMap<>());
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SseEmitter emitter = new SseEmitter(0L);
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emitters.put(token, emitter);
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emitter.onCompletion(() -> emitters.remove(token));
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emitter.onTimeout(() -> emitters.remove(token));
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emitter.onError((e) -> emitters.remove(token));
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try {
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emitter.send(SseEmitter.event().comment("connected"));
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} catch (IOException e) {
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emitters.remove(token);
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}
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return emitter;
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}
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public void disconnect(Long userId, String token) {
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Map<String, SseEmitter> emitters = USER_TOKEN_EMITTERS.get(userId);
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if (emitters != null) {
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try {
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emitters.get(token).send(SseEmitter.event().comment("disconnected"));
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} catch (Exception ignore) {
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}
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emitters.remove(token);
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}
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}
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/**
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* 订阅SSE消息主题，并提供一个消费者函数来处理接收到的消息
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*
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* @param consumer 处理SSE消息的消费者函数
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*/
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public void subscribeMessage(Consumer<SseMessageDto> consumer) {
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RedisUtils.subscribe(SSE_TOPIC, SseMessageDto.class, consumer);
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}
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/**
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* 向指定的用户会话发送消息
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*
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* @param userId 要发送消息的用户id
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* @param message 要发送的消息内容
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*/
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public void sendMessage(Long userId, String message) {
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Map<String, SseEmitter> emitters = USER_TOKEN_EMITTERS.get(userId);
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if (emitters != null) {
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for (Map.Entry<String, SseEmitter> entry : emitters.entrySet()) {
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try {
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entry.getValue().send(SseEmitter.event()
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.name("message")
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.data(message));
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} catch (Exception e) {
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emitters.remove(entry.getKey());
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}
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}
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}
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}
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/**
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* 本机全用户会话发送消息
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*
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* @param message 要发送的消息内容
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*/
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public void sendMessage(String message) {
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for (Long userId : USER_TOKEN_EMITTERS.keySet()) {
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sendMessage(userId, message);
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}
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}
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/**
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* 发布SSE订阅消息
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*
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* @param sseMessageDto 要发布的SSE消息对象
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*/
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public void publishMessage(SseMessageDto sseMessageDto) {
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List<Long> unsentUserIds = new ArrayList<>();
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// 当前服务内用户,直接发送消息
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for (Long userId : sseMessageDto.getUserIds()) {
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if (USER_TOKEN_EMITTERS.containsKey(userId)) {
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sendMessage(userId, sseMessageDto.getMessage());
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continue;
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}
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unsentUserIds.add(userId);
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}
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// 不在当前服务内用户,发布订阅消息
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if (CollUtil.isNotEmpty(unsentUserIds)) {
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SseMessageDto broadcastMessage = new SseMessageDto();
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broadcastMessage.setMessage(sseMessageDto.getMessage());
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broadcastMessage.setUserIds(unsentUserIds);
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RedisUtils.publish(SSE_TOPIC, broadcastMessage, consumer -> {
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log.info("SSE发送主题订阅消息topic:{} session keys:{} message:{}",
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SSE_TOPIC, unsentUserIds, sseMessageDto.getMessage());
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});
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}
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}
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/**
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* 向所有的用户发布订阅的消息(群发)
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*
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* @param message 要发布的消息内容
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*/
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public void publishAll(String message) {
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SseMessageDto broadcastMessage = new SseMessageDto();
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broadcastMessage.setMessage(message);
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RedisUtils.publish(SSE_TOPIC, broadcastMessage, consumer -> {
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log.info("SSE发送主题订阅消息topic:{} message:{}", SSE_TOPIC, message);
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});
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}
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}
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