/*
 * This file is part of Dependency-Track.
 *
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 * Copyright (c) OWASP Foundation. All Rights Reserved.
 */
package org.dependencytrack.notification;

import alpine.Config;
import alpine.common.logging.Logger;
import alpine.notification.NotificationService;
import alpine.notification.Subscription;
import org.dependencytrack.common.ConfigKey;

import jakarta.servlet.ServletContextEvent;
import jakarta.servlet.ServletContextListener;
import java.time.Duration;

/**
 * Initializes the notification subsystem and configures the notification router
 *
 * @author Steve Springett
 * @since 3.2.0
 */
public class NotificationSubsystemInitializer implements ServletContextListener {

    private static final Logger LOGGER = Logger.getLogger(NotificationSubsystemInitializer.class);

    // Starts the NotificationService
    private static final NotificationService NOTIFICATION_SERVICE = NotificationService.getInstance();

    private static final Duration DRAIN_TIMEOUT_DURATION =
            Duration.parse(Config.getInstance().getProperty(ConfigKey.ALPINE_WORKER_POOL_DRAIN_TIMEOUT_DURATION));

    /**
     * {@inheritDoc}
     */
    @Override
    public void contextInitialized(final ServletContextEvent event) {
        LOGGER.info("Initializing notification service");
        NOTIFICATION_SERVICE.subscribe(new Subscription(NotificationRouter.class));
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void contextDestroyed(final ServletContextEvent event) {
        LOGGER.info("Shutting down notification service");
        NOTIFICATION_SERVICE.shutdown(DRAIN_TIMEOUT_DURATION);
    }
}
