cn.wanghaomiao.seimi.core.SeimiContext Maven / Gradle / Ivy

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一个支持分布式的可以高效开发且可以高效运行的爬虫框架。设计思想上融合了spring与scrapy的优点。
There is a newer version: 2.1.4
package cn.wanghaomiao.seimi.core;

/*
   Copyright 2015 Wang Haomiao

   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.
 */

import cn.wanghaomiao.seimi.annotation.Crawler;
import cn.wanghaomiao.seimi.annotation.Interceptor;
import cn.wanghaomiao.seimi.annotation.Queue;
import cn.wanghaomiao.seimi.def.BaseSeimiCrawler;
import cn.wanghaomiao.seimi.exception.SeimiInitExcepiton;
import cn.wanghaomiao.seimi.struct.CrawlerModel;
import cn.wanghaomiao.seimi.utils.StrFormatUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.util.CollectionUtils;

import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;


/**
 * 初始化上下文环境
 * @author 汪浩淼 [[email protected]]
 *         Date: 2015/6/26.
 */
public class SeimiContext  extends AnnotationConfigApplicationContext {
    private int BASE_THREAD_NUM = 2;
    protected ApplicationContext applicationContext;
    protected SeimiScanner seimiScanner;
    protected Set> crawlers;
    protected List interceptors;
    protected Map crawlerModelContext;
    protected ExecutorService workersPool;
    protected Logger logger = LoggerFactory.getLogger(getClass());
    public SeimiContext(){
        register(ScanConfig.class);
        init();
        if(!CollectionUtils.isEmpty(crawlers)){
            prepareCrawlerModels();
            workersPool = Executors.newFixedThreadPool(BASE_THREAD_NUM*Runtime.getRuntime().availableProcessors()*crawlers.size());
            prepareWorkerThread();
        }else {
            logger.error("can not find any crawlers,please check!");
        }
    }

    private void init(){
        String[] targetPkgs = {"crawlers","queues","interceptors","cn.wanghaomiao.seimi"};
        seimiScanner = new SeimiScanner(this);
        Set> aladdin = seimiScanner.scan(targetPkgs, Crawler.class, Queue.class, Interceptor.class);
        applicationContext = this;
        crawlers = new HashSet<>();
        interceptors = new LinkedList<>();
        crawlerModelContext = new HashMap<>();
        for (Class cls:aladdin){
            if (BaseSeimiCrawler.class.isAssignableFrom(cls)){
                crawlers.add(cls);
            }else if (SeimiInterceptor.class.isAssignableFrom(cls)){
                interceptors.add((SeimiInterceptor)applicationContext.getBean(cls));
            }
        }
        Collections.sort(interceptors, new Comparator() {
            //对拦截器按照设定的权重进行倒序排序，如：88,66,11
            @Override
            public int compare(SeimiInterceptor o1, SeimiInterceptor o2) {
                return o1.getWeight() > o2.getWeight() ? -1 : 1;
            }
        });
    }

    private void prepareCrawlerModels(){
        for (Class a:crawlers){
            CrawlerModel crawlerModel = new CrawlerModel(a,applicationContext);
            if (crawlerModelContext.containsKey(crawlerModel.getCrawlerName())){
                logger.error("Crawler:{} is repeated,please check",crawlerModel.getCrawlerName());
                throw new SeimiInitExcepiton(StrFormatUtil.info("Crawler:{} is repeated,please check",crawlerModel.getCrawlerName()));
            }
            crawlerModelContext.put(crawlerModel.getCrawlerName(),crawlerModel);
        }
    }

    private void prepareWorkerThread(){
        for (Map.Entry crawlerEntry:crawlerModelContext.entrySet()){
            for (int i =0;i