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A set of common classes and interfaces for web application development

There is a newer version: 5.3.1

/*
 * Copyright (C) 2023 Dynamia Soluciones IT S.A.S - NIT 900302344-1
 * Colombia / South America
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package tools.dynamia.web.util;

import jakarta.servlet.http.HttpSession;
import jakarta.servlet.http.HttpSessionEvent;
import jakarta.servlet.http.HttpSessionListener;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

/**
 * Very simple session tracker. Do not use it in cluster environment
 *
 * @author Mario A. Serrano Leones
 */
public class SessionTracker implements HttpSessionListener {


    private static final List activeSessions = Collections.synchronizedList(new ArrayList<>());

    @Override
    public void sessionCreated(HttpSessionEvent evt) {
        var session = evt.getSession();
        activeSessions.add(session);

    }

    @Override
    public void sessionDestroyed(HttpSessionEvent evt) {
        var session = evt.getSession();
        boolean remove = activeSessions.remove(session);
        if (!remove) {
            activeSessions.removeIf(s -> s.getId().equals(session.getId()));
        }
    }

    public static Collection getActiveSessions() {
        return activeSessions;
    }

    public static HttpSession getSessionById(String sessionId) {
        return activeSessions.stream().filter(s -> s.getId().equals(sessionId)).findFirst().orElse(null);
    }

    public static int getActionSessionsCount() {
        return getActiveSessions().size();
    }

    public static void clear() {
        activeSessions.clear();
    }
}