com.github.mrstampy.gameboot.web.HttpSessionRegistry.java Source code

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Here is the source code for com.github.mrstampy.gameboot.web.HttpSessionRegistry.java

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/*
 *              ______                        ____              __ 
 *             / ____/___ _____ ___  ___     / __ )____  ____  / /_
 *            / / __/ __ `/ __ `__ \/ _ \   / __  / __ \/ __ \/ __/
 *           / /_/ / /_/ / / / / / /  __/  / /_/ / /_/ / /_/ / /_  
 *           \____/\__,_/_/ /_/ /_/\___/  /_____/\____/\____/\__/  
 *                                                 
 *                                 .-'\
 *                              .-'  `/\
 *                           .-'      `/\
 *                           \         `/\
 *                            \         `/\
 *                             \    _-   `/\       _.--.
 *                              \    _-   `/`-..--\     )
 *                               \    _-   `,','  /    ,')
 *                                `-_   -   ` -- ~   ,','
 *                                 `-              ,','
 *                                  \,--.    ____==-~
 *                                   \   \_-~\
 *                                    `_-~_.-'
 *                                     \-~
 * 
 *                       http://mrstampy.github.io/gameboot/
 *
 * Copyright (C) 2015, 2016 Burton Alexander
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * 
 */
package com.github.mrstampy.gameboot.web;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

import javax.annotation.PostConstruct;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import com.github.mrstampy.gameboot.metrics.MetricsHelper;
import com.github.mrstampy.gameboot.systemid.SystemId;
import com.github.mrstampy.gameboot.util.registry.AbstractRegistryKey;
import com.github.mrstampy.gameboot.util.registry.GameBootRegistry;
import com.github.mrstampy.gameboot.util.registry.RegistryCleaner;

/**
 * The Class HttpSessionRegistry.
 */
@Component
public class HttpSessionRegistry extends GameBootRegistry<HttpSession> {

    private static final String WEB_CONNECTIONS = "Web Connections";

    @Autowired
    private ScheduledExecutorService svc;

    @Autowired
    private MetricsHelper helper;

    @Value("${http.session.expiry.seconds}")
    private int expiry;

    @Autowired
    private RegistryCleaner cleaner;

    private Map<Comparable<?>, ScheduledFuture<?>> futures = new ConcurrentHashMap<>();

    /**
     * Post construct.
     *
     * @throws Exception
     *           the exception
     */
    @PostConstruct
    public void postConstruct() throws Exception {
        helper.gauge(() -> size(), WEB_CONNECTIONS, getClass(), "web", "connections");
    }

    /**
     * Puts the newly generated key paired against the {@link SystemId#next()} id
     * value of the http session.
     *
     * @param key
     *          the key
     * @param value
     *          the value
     */
    @Override
    public void put(AbstractRegistryKey<?> key, HttpSession value) {
        if (contains(key))
            return;

        scheduleCleanup(key, value);
    }

    /**
     * Removes the HttpSession.
     *
     * @param key
     *          the key
     * @return the byte[]
     */
    @Override
    public HttpSession remove(AbstractRegistryKey<?> key) {
        HttpSession session = super.remove(key);

        stopCleanup(key);

        return session;
    }

    /**
     * Restart expiry.
     *
     * @param key
     *          the key
     */
    public void restartExpiry(AbstractRegistryKey<?> key) {
        HttpSession session = get(key);

        stopCleanup(key);

        scheduleCleanup(key, session);
    }

    private void stopCleanup(AbstractRegistryKey<?> key) {
        ScheduledFuture<?> sf = futures.remove(key);
        if (sf != null)
            sf.cancel(true);
    }

    private void scheduleCleanup(AbstractRegistryKey<?> key, HttpSession value) {
        ScheduledFuture<?> sf = futures.remove(key);
        if (sf != null)
            sf.cancel(true);

        super.put(key, value);

        sf = svc.schedule(() -> cleanup(key, value), expiry, TimeUnit.SECONDS);
        futures.put(key, sf);
    }

    private void cleanup(AbstractRegistryKey<?> key, HttpSession value) {
        super.remove(key);
        futures.remove(key);
        cleaner.cleanup(key);
    }

}