package com.qianwen.core.websocket.holder;

import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Collectors;
import org.springframework.web.socket.WebSocketSession;
/**
 * websocketsession存取
 */
public class WebSocketSessionHolder {
    private static final Map<Object, Set<WebSocketSession>> USER_SESSION_MAP = new ConcurrentHashMap<>();

    private WebSocketSessionHolder() {
    }

    public static void addSession(Object sessionKey, WebSocketSession session) {
        USER_SESSION_MAP.put(sessionKey, combineSessionWithSameKey(sessionKey, session));
    }

    public static void removeSession(Object sessionKey) {
        USER_SESSION_MAP.remove(sessionKey);
    }

    public static void removeSession(Object sessionKey, WebSocketSession session) {
        Set<WebSocketSession> webSocketSessions = USER_SESSION_MAP.get(sessionKey);
        webSocketSessions.remove(session);
    }

    public static Set<WebSocketSession> getSession(Object sessionKey) {
        return USER_SESSION_MAP.get(sessionKey);
    }

    public static Collection<WebSocketSession> getSessions() {
        return USER_SESSION_MAP.values().stream().flatMap(Collection::stream).collect(Collectors.toList());
    }

    public static Set<Object> SessionKeys() {
        return USER_SESSION_MAP.keySet();
    }

    private static Set<WebSocketSession> combineSessionWithSameKey(Object sessionKey, WebSocketSession session) {
        Set<WebSocketSession> result = USER_SESSION_MAP.getOrDefault(sessionKey, new HashSet());
        result.add(session);
        return result;
    }
}