com.jensfendler.ninjaquartz.provider.QuartzSchedulerFactoryProvider Maven / Gradle / Ivy

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Quartz Scheduler Integration for the Ninja Web Framework

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/*
 * Copyright 2016 Fendler Consulting cc.
 *
 * 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 com.jensfendler.ninjaquartz.provider;

import org.quartz.SchedulerFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import com.jensfendler.ninjaquartz.NinjaQuartzModule;

import ninja.utils.NinjaProperties;

/**
 * @author Jens Fendler
 *
 */
@Singleton
public class QuartzSchedulerFactoryProvider implements Provider {

    protected static final Logger logger = LoggerFactory.getLogger(NinjaQuartzModule.class);

    /**
     * {@link NinjaProperties} as injected in constructor
     */
    private NinjaProperties ninjaProperties;

    private static SchedulerFactory schedulerFactory;

    @Inject
    public QuartzSchedulerFactoryProvider(NinjaProperties ninjaProperties) {
        logger.info("Initialising {}.", getClass().getName());
        this.ninjaProperties = ninjaProperties;
    }

    /**
     * @see com.google.inject.Provider#get()
     */
    @Override
    public SchedulerFactory get() {
        logger.debug("{} called to get SchedulerFactory.", getClass().getName());
        if (schedulerFactory == null) {
            loadSchedulerFactory();
        }
        return schedulerFactory;
    }

    /**
     * Instantiate the configured {@link SchedulerFactory} class.
     */
    private void loadSchedulerFactory() {
        String sfClassName = ninjaProperties.getWithDefault("quartz.schedulerFactory",
                "org.quartz.impl.StdSchedulerFactory");
        logger.info("Using Quartz SchedulerFactory from {}.", sfClassName);

        try {
            Class sfClass = Class.forName(sfClassName);
            schedulerFactory = (SchedulerFactory) sfClass.newInstance();
        } catch (ClassNotFoundException e) {
            throw new RuntimeException("Quartz SchedulerFactory class '" + sfClassName + "' not found.", e);
        } catch (InstantiationException e) {
            throw new RuntimeException("Cannot instantiate Quartz SchedulerFactory class '" + sfClassName + "'.", e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(
                    "Illegal access exception while trying to instantiate Quartz SchedulerFactory class '" + sfClassName
                            + "'.",
                    e);
        }
    }

}