| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.nutch.crawl; |
| |
| import org.apache.hadoop.io.Text; |
| |
| /** |
| * This class implements the default re-fetch schedule. That is, no matter if |
| * the page was changed or not, the <code>fetchInterval</code> remains |
| * unchanged, and the updated page fetchTime will always be set to |
| * <code>fetchTime + fetchInterval * 1000</code>. |
| * |
| * @author Andrzej Bialecki |
| */ |
| public class DefaultFetchSchedule extends AbstractFetchSchedule { |
| |
| @Override |
| public CrawlDatum setFetchSchedule(Text url, CrawlDatum datum, |
| long prevFetchTime, long prevModifiedTime, long fetchTime, |
| long modifiedTime, int state) { |
| datum = super.setFetchSchedule(url, datum, prevFetchTime, prevModifiedTime, |
| fetchTime, modifiedTime, state); |
| if (datum.getFetchInterval() == 0) { |
| datum.setFetchInterval(defaultInterval); |
| } |
| datum.setFetchTime(fetchTime + (long) datum.getFetchInterval() * 1000); |
| if (modifiedTime <= 0 || state == FetchSchedule.STATUS_MODIFIED) { |
| // Set modifiedTime to fetchTime on first successful fetch |
| modifiedTime = fetchTime; |
| } |
| datum.setModifiedTime(modifiedTime); |
| return datum; |
| } |
| } |