/*
* This file is part of the Heritrix web crawler (crawler.archive.org).
*
* Licensed to the Internet Archive (IA) by one or more individual
* contributors.
*
* The IA 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.archive.crawler.frontier;
import org.archive.modules.CrawlURI;
import org.archive.net.UURI;
/**
* A CostAssignmentPolicy based on some wild guesses of kinds of URIs
* that should be deferred into the (potentially never-crawled) future.
*
* @author gojomo
*/
public class WagCostAssignmentPolicy extends CostAssignmentPolicy {
private static final long serialVersionUID = 1L;
/**
* Add constant penalties for certain features of URI (and
* its 'via') that make it more delayable/skippable.
*
* @param curi CrawlURI to be assigned a cost
*
* @see org.archive.crawler.frontier.CostAssignmentPolicy#costOf(org.archive.modules.CrawlURI)
*/
public int costOf(CrawlURI curi) {
int cost = 1;
UURI uuri = curi.getUURI();
if (uuri.hasQuery()) {
// has query string
cost++;
int qIndex = uuri.toString().indexOf('?');
if (curi.flattenVia().startsWith(uuri.toString().substring(0,qIndex))) {
// non-query-string portion of URI is same as previous
cost++;
}
// TODO: other potential query-related cost penalties:
// - more than X query-string attributes
// - calendarish terms
// - query-string over certain size
}
// TODO: other potential path-based penalties
// - new path is simply extension of via path
// - many path segments
// TODO: other potential hops-based penalties
// - more than X hops
// - each speculative hop
return cost;
}
}