edu.xiyou.fruits.WebCrawler.scheduler.BloomScheduler.java Source code

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Here is the source code for edu.xiyou.fruits.WebCrawler.scheduler.BloomScheduler.java

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/*
 *Copyright (c) 2015 Andrew-Wang. 
 *
 *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 edu.xiyou.fruits.WebCrawler.scheduler;

import edu.xiyou.fruits.WebCrawler.parser.CrawlDatum;
import edu.xiyou.fruits.WebCrawler.utils.BloomFilter;
import edu.xiyou.fruits.WebCrawler.utils.Config;
import org.apache.http.annotation.ThreadSafe;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.sql.Time;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * Created by andrew on 15-6-7.
 */
@ThreadSafe
public class BloomScheduler extends SchedulerMonitor implements Scheduler {
    private BlockingQueue<String> queue = new LinkedBlockingQueue<String>();
    private BloomFilter<String> bloomFilter = new BloomFilter<String>(Config.BLOOMFILTER_ERROR_RATE,
            Config.FETCH_COUNT);

    private Logger logger = LoggerFactory.getLogger(this.getClass());

    @Override
    public String takeTasks() throws InterruptedException {
        takeTaskCount.incrementAndGet();
        String url = queue.poll(60, TimeUnit.SECONDS);
        return url;
    }

    @Override
    public void putTasks(List<String> urls) {
        synchronized (this) {
            for (String url : urls) {
                if ((url != null) && !bloomFilter.contains(url)) {
                    //                    System.out.println(url);
                    putTaskCount.incrementAndGet();
                    bloomFilter.add(url);
                    queue.offer(url);
                }
            }
        }
    }
}