wamblee.org Git - utils/blob

   1 /*
   2  * Copyright 2006 the original author or authors.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.wamblee.crawler.kiss.scheduling.quartz;
  18
  19 import java.util.Date;
  20 import java.util.List;
  21
  22 import org.quartz.JobDetail;
  23 import org.quartz.Scheduler;
  24 import org.quartz.SchedulerException;
  25 import org.quartz.SchedulerFactory;
  26 import org.quartz.SimpleTrigger;
  27 import org.quartz.Trigger;
  28 import org.quartz.TriggerUtils;
  29 import org.quartz.impl.StdSchedulerFactory;
  30 import org.wamblee.crawler.kiss.scheduling.CrawlerScheduler;
  31
  32 /**
  33  * Interface to the Quartz scheduler.
  34  *
  35  * @author Erik Brakkee
  36  */
  37 public class QuartzCrawlerScheduler implements CrawlerScheduler {
  38
  39     /**
  40      *
  41      */
  42     private static final String TRIGGER_NAME = "interval";
  43
  44     /**
  45      *
  46      */
  47     private static final String JOB_NAME = "kisscrawler";
  48
  49     private Scheduler _scheduler;
  50
  51     private int _intervalInSeconds;
  52
  53     /**
  54      * Constructs the quartz interface.
  55      * @param aIntervalInSeconds Scheduling interval in seconds.
  56      * @throws SchedulerException
  57      */
  58     public QuartzCrawlerScheduler(int aIntervalInSeconds) throws SchedulerException {
  59         SchedulerFactory schedulerFactory = new StdSchedulerFactory();
  60         _scheduler = schedulerFactory.getScheduler();
  61         _intervalInSeconds = aIntervalInSeconds;
  62     }
  63
  64     /**
  65      * Initializes the scheduler.
  66      * @throws SchedulerException
  67      */
  68     public void initialize() throws SchedulerException {
  69         _scheduler.start();
  70
  71         JobDetail jobDetail = new JobDetail(JOB_NAME, null, CrawlerJob.class);
  72         Trigger trigger = TriggerUtils.makeSecondlyTrigger(_intervalInSeconds);
  73         //trigger.setStartTime(TriggerUtils.getEvenHourDate(new Date()));
  74         trigger.setStartTime(new Date());
  75         trigger.setName(TRIGGER_NAME);
  76
  77         _scheduler.scheduleJob(jobDetail, trigger);
  78     }
  79
  80     /* (non-Javadoc)
  81      * @see org.wamblee.crawler.kiss.scheduling.CrawlerScheduler#isCrawlerRunning()
  82      */
  83     public boolean isCrawlerRunning() throws Exception {
  84         List jobs = _scheduler.getCurrentlyExecutingJobs();
  85         return jobs.size() > 0;
  86     }
  87
  88     /* (non-Javadoc)
  89      * @see org.wamblee.crawler.kiss.scheduling.CrawlerScheduler#scheduleNow()
  90      */
  91     public void scheduleNow() throws Exception {
  92         Trigger trigger = new SimpleTrigger("immediate", null);
  93         trigger.setJobName(JOB_NAME);
  94         _scheduler.scheduleJob(trigger);
  95     }
  96
  97     /**
  98      * Shuts down the scheduler.
  99      * @throws SchedulerException
 100      */
 101     public void shutdown() throws SchedulerException {
 102         _scheduler.shutdown();
 103     }
 104 }