LocalDataCollectorController.java

/**
 * 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 edu.uci.ics.crawler4j.examples.localdata;

import java.util.List;

import edu.uci.ics.crawler4j.crawler.CrawlConfig;
import edu.uci.ics.crawler4j.crawler.CrawlController;
import edu.uci.ics.crawler4j.fetcher.PageFetcher;
import edu.uci.ics.crawler4j.robotstxt.RobotstxtConfig;
import edu.uci.ics.crawler4j.robotstxt.RobotstxtServer;

public class LocalDataCollectorController {

	public static void main(String[] args) throws Exception {
		if (args.length != 2) {
			System.out.println("Needed parameters: ");
			System.out.println("\t rootFolder (it will contain intermediate crawl data)");
			System.out.println("\t numberOfCralwers (number of concurrent threads)");
			return;
		}
		String rootFolder = args[0];
		int numberOfCrawlers = Integer.parseInt(args[1]);

		CrawlConfig config = new CrawlConfig();
		config.setCrawlStorageFolder(rootFolder);
		config.setMaxPagesToFetch(10);
		config.setPolitenessDelay(1000);

		PageFetcher pageFetcher = new PageFetcher(config);
		RobotstxtConfig robotstxtConfig = new RobotstxtConfig();
		RobotstxtServer robotstxtServer = new RobotstxtServer(robotstxtConfig, pageFetcher);
		CrawlController controller = new CrawlController(config, pageFetcher, robotstxtServer);

		controller.addSeed("http://www.ics.uci.edu/");
		controller.start(LocalDataCollectorCrawler.class, numberOfCrawlers);

		List<Object> crawlersLocalData = controller.getCrawlersLocalData();
		long totalLinks = 0;
		long totalTextSize = 0;
		int totalProcessedPages = 0;
		for (Object localData : crawlersLocalData) {
			CrawlStat stat = (CrawlStat) localData;
			totalLinks += stat.getTotalLinks();
			totalTextSize += stat.getTotalTextSize();
			totalProcessedPages += stat.getTotalProcessedPages();
		}
		System.out.println("Aggregated Statistics:");
		System.out.println("   Processed Pages: " + totalProcessedPages);
		System.out.println("   Total Links found: " + totalLinks);
		System.out.println("   Total Text Size: " + totalTextSize);
	}

}