com.laudandjolynn.mytv.proxy.MyTvProxyManager.java Source code

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Here is the source code for com.laudandjolynn.mytv.proxy.MyTvProxyManager.java

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/*******************************************************************************
 * Copyright 2015 htd0324@gmail.com
 * 
 * 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 com.laudandjolynn.mytv.proxy;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;

import org.apache.commons.lang3.concurrent.BasicThreadFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.laudandjolynn.mytv.model.Proxy;
import com.laudandjolynn.mytv.utils.Constant;

/**
 * @author: Laud
 * @email: htd0324@gmail.com
 * @date: 2015428 ?5:47:56
 * @copyright: www.laudandjolynn.com
 */
public class MyTvProxyManager {
    private final static Logger logger = LoggerFactory.getLogger(MyTvProxyManager.class);
    public final static String PROXY_ANONYMOUS_HIGH = "";
    public final static String PROXY_TYPE_SOCK = "scok5";
    private final static String LOCALHOST = "localhost";
    private final ConcurrentLinkedQueue<Proxy> PROXY_QUEUE = new ConcurrentLinkedQueue<Proxy>();
    private final static Proxy LOCALHOST_PROXY = new Proxy(LOCALHOST, 80);
    private List<ProxyProvider> providerList = new ArrayList<ProxyProvider>();

    private MyTvProxyManager() {
    }

    private final static class MyTvProxySingletonHolder {
        private final static MyTvProxyManager MY_TV_PROXY = new MyTvProxyManager();
    }

    public static MyTvProxyManager getInstance() {
        return MyTvProxySingletonHolder.MY_TV_PROXY;
    }

    public void prepareProxies(ProxyProvider... providers) {
        int length = providers == null ? 0 : providers.length;
        if (length > 0) {
            int maxThreadNum = Constant.CPU_PROCESSOR_NUM;
            ThreadFactory threadFactory = new BasicThreadFactory.Builder().namingPattern("MyTv_Find_Proxies_%d")
                    .build();
            ExecutorService executorService = Executors
                    .newFixedThreadPool(length > maxThreadNum ? maxThreadNum : length, threadFactory);
            CompletionService<List<Proxy>> completionService = new ExecutorCompletionService<List<Proxy>>(
                    executorService);
            providerList.clear();
            for (int i = 0; i < length; i++) {
                final ProxyProvider provider = providers[i];
                providerList.add(provider);
                completionService.submit(new Callable<List<Proxy>>() {

                    @Override
                    public List<Proxy> call() throws Exception {
                        return provider.getProxies();
                    }
                });
            }
            executorService.shutdown();

            int count = 0;
            List<Proxy> resultList = new ArrayList<Proxy>();
            while (count < length) {
                try {
                    Future<List<Proxy>> future = completionService.take();
                    List<Proxy> proxies = future.get();
                    if (proxies != null) {
                        resultList.addAll(proxies);
                    }
                } catch (InterruptedException e) {
                    logger.error("get proxies thread has interrupted.", e);
                } catch (ExecutionException e) {
                    logger.error("get proxies thread has execution fail.", e);
                }
                count++;
            }
            resultList.add(LOCALHOST_PROXY);
            PROXY_QUEUE.clear();
            PROXY_QUEUE.addAll(resultList);
        }
    }

    /**
     * ??
     */
    public void refresh() {
        int size = providerList.size();
        ProxyProvider[] providers = new ProxyProvider[size];
        prepareProxies(providerList.toArray(providers));
    }

    public int getProxySize() {
        return PROXY_QUEUE.size();
    }

    public Proxy pickProxy() {
        Proxy proxy = PROXY_QUEUE.poll();
        if (proxy == null) {
            return null;
        }
        PROXY_QUEUE.offer(proxy);
        if (LOCALHOST.equals(proxy.getIp())) {
            return null;
        }
        return proxy;
    }
}