com.logsniffer.app.SchedulerAppConfig.java Source code

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Here is the source code for com.logsniffer.app.SchedulerAppConfig.java

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/*******************************************************************************
 * logsniffer, open source tool for viewing, monitoring and analysing log data.
 * Copyright (c) 2015 Scaleborn UG, www.scaleborn.com
 *
 * logsniffer 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 3 of the License, or
 * (at your option) any later version.
 *
 * logsniffer 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/>.
 *******************************************************************************/
package com.logsniffer.app;

import java.util.Properties;
import java.util.UUID;

import javax.sql.DataSource;

import org.quartz.SchedulerException;
import org.quartz.simpl.SimpleInstanceIdGenerator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.quartz.SchedulerFactoryBean;

/**
 * Initiates the Quartz scheduler and Spring's Scheduled tasks.
 * 
 * @author mbok
 * 
 */
@Configuration
@EnableScheduling
public class SchedulerAppConfig {
    private static Logger logger = LoggerFactory.getLogger(SchedulerAppConfig.class);

    @Autowired
    private DataSource dataSource;

    @Autowired
    @Qualifier(CoreAppConfig.BEAN_LOGSNIFFER_PROPS)
    private Properties logSnifferProperties;

    /**
     * Defines a clustered Quartz Scheduler configured by properties from
     * {@link #acBackendProperties}.
     * 
     * @return Quart scheduler
     */
    @Bean
    public SchedulerFactoryBean schedulerFactory() {
        SchedulerFactoryBean schedulerFactory = new SchedulerFactoryBean();
        schedulerFactory.setAutoStartup(true);
        schedulerFactory.setDataSource(dataSource);
        schedulerFactory.setWaitForJobsToCompleteOnShutdown(true);
        schedulerFactory.setOverwriteExistingJobs(true);
        schedulerFactory.setSchedulerName("LogsnifferScheduler");
        Properties quartzProperties = new Properties(logSnifferProperties);
        quartzProperties.setProperty("org.quartz.scheduler.instanceIdGenerator.class",
                SafeSimpleInstanceIdGenerator.class.getName());
        schedulerFactory.setQuartzProperties(quartzProperties);
        return schedulerFactory;
    }

    /**
     * Because {@link SimpleInstanceIdGenerator} can fail in case of DNS issues
     * with the local host name, this class provides in a fallback a UUID.
     * 
     * @author mbok
     *
     */
    public static final class SafeSimpleInstanceIdGenerator extends SimpleInstanceIdGenerator {
        @Override
        public String generateInstanceId() throws SchedulerException {
            try {
                String name = super.generateInstanceId();
                logger.info("Using host based schedule instance id: {}", name);
                return name;
            } catch (Exception e) {
                String name = UUID.randomUUID().toString();
                logger.info(
                        "Using generated UUID '{}' for scheduler instance id, because of errors getting the host name: {}",
                        name, (e.getCause() != null ? e.getCause().getMessage() : e.getMessage()));
                return name;
            }
        }

    }
}