de.metas.ui.web.session.FixedMapSessionRepository.java Source code

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Here is the source code for de.metas.ui.web.session.FixedMapSessionRepository.java

Source

package de.metas.ui.web.session;

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

import javax.annotation.Nullable;

import org.slf4j.Logger;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.session.ExpiringSession;
import org.springframework.session.MapSession;
import org.springframework.session.MapSessionRepository;
import org.springframework.session.SessionRepository;
import org.springframework.session.events.SessionCreatedEvent;
import org.springframework.session.events.SessionDeletedEvent;
import org.springframework.session.events.SessionExpiredEvent;

import com.google.common.base.Stopwatch;

import de.metas.logging.LogManager;
import lombok.Builder;
import lombok.NonNull;
import lombok.ToString;

/*
 * #%L
 * metasfresh-webui-api
 * %%
 * Copyright (C) 2018 metas GmbH
 * %%
 * 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, see
 * <http://www.gnu.org/licenses/gpl-2.0.html>.
 * #L%
 */

/**
 * Similar with {@link MapSessionRepository} but it's also firing session created/destroyed events.
 * 
 * @author metas-dev <dev@metasfresh.com>
 *
 */
@ToString(of = { "defaultMaxInactiveInterval" })
/* package */class FixedMapSessionRepository implements SessionRepository<ExpiringSession> {
    private static final Logger logger = LogManager.getLogger(FixedMapSessionRepository.class);

    private final Map<String, ExpiringSession> sessions = new ConcurrentHashMap<>();

    private final ApplicationEventPublisher applicationEventPublisher;
    private final Integer defaultMaxInactiveInterval;

    @Builder
    private FixedMapSessionRepository(@NonNull final ApplicationEventPublisher applicationEventPublisher,
            @Nullable final Integer defaultMaxInactiveInterval) {
        this.applicationEventPublisher = applicationEventPublisher;
        this.defaultMaxInactiveInterval = defaultMaxInactiveInterval;
    }

    @Override
    public void save(final ExpiringSession session) {
        sessions.put(session.getId(), new MapSession(session));
    }

    @Override
    public ExpiringSession getSession(final String id) {
        final ExpiringSession saved = sessions.get(id);
        if (saved == null) {
            return null;
        }
        if (saved.isExpired()) {
            final boolean expired = true;
            deleteAndFireEvent(saved.getId(), expired);
            return null;
        }

        return new MapSession(saved);
    }

    @Override
    public void delete(final String id) {
        final boolean expired = false;
        deleteAndFireEvent(id, expired);
    }

    private void deleteAndFireEvent(final String id, boolean expired) {
        final ExpiringSession deletedSession = sessions.remove(id);

        // Fire event
        if (deletedSession != null) {
            if (expired) {
                applicationEventPublisher.publishEvent(new SessionExpiredEvent(this, id));
            } else {
                applicationEventPublisher.publishEvent(new SessionDeletedEvent(this, id));
            }
        }
    }

    @Override
    public ExpiringSession createSession() {
        final ExpiringSession result = new MapSession();
        if (defaultMaxInactiveInterval != null) {
            result.setMaxInactiveIntervalInSeconds(defaultMaxInactiveInterval);
        }

        // Fire event
        applicationEventPublisher.publishEvent(new SessionCreatedEvent(this, result.getId()));

        return result;
    }

    public void purgeExpiredSessionsNoFail() {
        try {
            purgeExpiredSessions();
        } catch (final Throwable ex) {
            logger.warn("Failed purging expired sessions. Ignored.", ex);
        }
    }

    public void purgeExpiredSessions() {
        final Stopwatch stopwatch = Stopwatch.createStarted();
        int countExpiredSessions = 0;

        final List<ExpiringSession> sessionsToCheck = new ArrayList<>(sessions.values());
        for (final ExpiringSession session : sessionsToCheck) {
            if (session.isExpired()) {
                deleteAndFireEvent(session.getId(), true /* expired */);
                countExpiredSessions++;
            }
        }

        logger.debug("Purged {}/{} expired sessions in {}", countExpiredSessions, sessionsToCheck.size(),
                stopwatch);
    }
}