Merge pull request #976 from yaoqiangpersonal/master

主要是对代理的功能进行了增加和修改

webmagic-core/pom.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <parent>
         <groupId>us.codecraft</groupId>
         <artifactId>webmagic-parent</artifactId>
@@ -24,6 +25,12 @@
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.10</version>
+            <scope>provided</scope>
+        </dependency>
 
         <dependency>
             <groupId>us.codecraft</groupId>

webmagic-core/src/main/java/us/codecraft/webmagic/Site.java

@@ -1,5 +1,6 @@
 package us.codecraft.webmagic;
 
+import com.sun.org.apache.regexp.internal.RE;
 import us.codecraft.webmagic.utils.HttpConstant;
 
 import java.util.*;
@@ -35,8 +36,12 @@ public class Site {
 
     private static final Set<Integer> DEFAULT_STATUS_CODE_SET = new HashSet<Integer>();
 
+    private static final Set<Integer> DEFAULT_REFRESH_CODE_SET = new HashSet<>();
+
+    private Set<Integer> refreshCode = DEFAULT_REFRESH_CODE_SET;
     private Set<Integer> acceptStatCode = DEFAULT_STATUS_CODE_SET;
 
+
     private Map<String, String> headers = new HashMap<String, String>();
 
     private boolean useGzip = true;
@@ -44,6 +49,7 @@ public class Site {
     private boolean disableCookieManagement = false;
 
     static {
+        DEFAULT_REFRESH_CODE_SET.add(HttpConstant.StatusCode.FORBIDDEN);
         DEFAULT_STATUS_CODE_SET.add(HttpConstant.StatusCode.CODE_200);
     }
 
@@ -192,6 +198,15 @@ public class Site {
         return this;
     }
 
+    public Site setRefreshCode(Set<Integer> refreshCode){
+        this.refreshCode = refreshCode;
+        return this;
+    }
+    public Set<Integer> getRefreshCode(){
+        return refreshCode;
+
+    }
+
     /**
      * get acceptStatCode
      *

webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java

@@ -24,6 +24,7 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.atomic.LongAdder;
 import java.util.concurrent.locks.Condition;
 import java.util.concurrent.locks.ReentrantLock;
 
@@ -102,7 +103,7 @@ public class Spider implements Runnable, Task {
 
     private List<SpiderListener> spiderListeners;
 
-    private final AtomicLong pageCount = new AtomicLong(0);
+    private final LongAdder pageCount = new LongAdder();
 
     private Date startTime;
 
@@ -323,7 +324,7 @@ public class Spider implements Runnable, Task {
                             onError(request);
                             logger.error("process request " + request + " error", e);
                         } finally {
-                            pageCount.incrementAndGet();
+                            pageCount.increment();
                             signalNewUrl();
                         }
                     }
@@ -335,7 +336,7 @@ public class Spider implements Runnable, Task {
         if (destroyWhenExit) {
             close();
         }
-        logger.info("Spider {} closed! {} pages downloaded.", getUUID(), pageCount.get());
+        logger.info("Spider {} closed! {} pages downloaded.", getUUID(), pageCount.sumThenReset());
     }
 
     protected void onError(Request request) {
@@ -423,7 +424,11 @@ public class Spider implements Runnable, Task {
                     pipeline.process(page.getResultItems(), this);
                 }
             }
-        } else {
+        } else if(site.getRefreshCode().contains(page.getStatusCode())) {
+            logger.info("page status code error, page {} , code: {}, start refresh downloader", request.getUrl(), page.getStatusCode());
+            downloader.refreshComponent(this);
+            failHandler(request);
+        }else {
             logger.info("page status code error, page {} , code: {}", request.getUrl(), page.getStatusCode());
         }
         sleep(site.getSleepTime());
@@ -431,6 +436,10 @@ public class Spider implements Runnable, Task {
     }
 
     private void onDownloaderFail(Request request) {
+       failHandler(request);
+    }
+
+    private void failHandler(Request request){
         if (site.getCycleRetryTimes() == 0) {
             sleep(site.getSleepTime());
         } else {
@@ -650,7 +659,7 @@ public class Spider implements Runnable, Task {
      * @since 0.4.1
      */
     public long getPageCount() {
-        return pageCount.get();
+        return pageCount.sum();
     }
 
     /**

webmagic-core/src/main/java/us/codecraft/webmagic/downloader/AbstractDownloader.java

@@ -3,6 +3,7 @@ package us.codecraft.webmagic.downloader;
 import us.codecraft.webmagic.Page;
 import us.codecraft.webmagic.Request;
 import us.codecraft.webmagic.Site;
+import us.codecraft.webmagic.proxy.ProxyProvider;
 import us.codecraft.webmagic.selector.Html;
 
 /**
@@ -38,7 +39,7 @@ public abstract class AbstractDownloader implements Downloader {
     protected void onSuccess(Request request) {
     }
 
-    protected void onError(Request request) {
+    protected void onError(Request request, Throwable throwable, ProxyProvider proxyProvider) {
     }
 
 }

webmagic-core/src/main/java/us/codecraft/webmagic/downloader/Downloader.java

@@ -18,14 +18,18 @@ public interface Downloader {
      * Downloads web pages and store in Page object.
      *
      * @param request request
-     * @param task task
+     * @param task    task
      * @return page
      */
-    public Page download(Request request, Task task);
+    Page download(Request request, Task task);
 
     /**
      * Tell the downloader how many threads the spider used.
+     *
      * @param threadNum number of threads
      */
-    public void setThread(int threadNum);
+    void setThread(int threadNum);
+
+
+    void refreshComponent(Task task);
 }

webmagic-core/src/main/java/us/codecraft/webmagic/downloader/HttpClientDownloader.java

@@ -13,6 +13,8 @@ import us.codecraft.webmagic.Site;
 import us.codecraft.webmagic.Task;
 import us.codecraft.webmagic.proxy.Proxy;
 import us.codecraft.webmagic.proxy.ProxyProvider;
+import us.codecraft.webmagic.proxy.RefreshableProxyProvider;
+import us.codecraft.webmagic.proxy.ReturnableProxyProvider;
 import us.codecraft.webmagic.selector.PlainText;
 import us.codecraft.webmagic.utils.CharsetUtils;
 import us.codecraft.webmagic.utils.HttpClientUtils;
@@ -21,6 +23,8 @@ import java.io.IOException;
 import java.nio.charset.Charset;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Predicate;
 
 
 /**
@@ -31,17 +35,29 @@ import java.util.Map;
  */
 public class HttpClientDownloader extends AbstractDownloader {
 
-    private Logger logger = LoggerFactory.getLogger(getClass());
-
-    private final Map<String, CloseableHttpClient> httpClients = new HashMap<String, CloseableHttpClient>();
-
-    private HttpClientGenerator httpClientGenerator = new HttpClientGenerator();
+    private final Map<String, CloseableHttpClient> httpClients = new ConcurrentHashMap<>();
+    private final Logger logger = LoggerFactory.getLogger(getClass());
+    private final HttpClientGenerator httpClientGenerator = new HttpClientGenerator();
 
     private HttpUriRequestConverter httpUriRequestConverter = new HttpUriRequestConverter();
-    
+
     private ProxyProvider proxyProvider;
 
-    private boolean responseHeader = true;
+    private final boolean responseHeader = true;
+
+
+    private Predicate<Throwable> refreshProxyOnError = t -> false;
+
+
+    private Predicate<Throwable> refreshClientOnError = t -> false;
+
+
+    public void setRefreshClientOnError(Predicate<Throwable> clientOnError){
+        this.refreshClientOnError = clientOnError;
+    }
+    public void setRefreshProxyOnError(Predicate<Throwable> proxyOnError) {
+        this.refreshProxyOnError = proxyOnError;
+    }
 
     public void setHttpUriRequestConverter(HttpUriRequestConverter httpUriRequestConverter) {
         this.httpUriRequestConverter = httpUriRequestConverter;
@@ -56,17 +72,8 @@ public class HttpClientDownloader extends AbstractDownloader {
             return httpClientGenerator.getClient(null);
         }
         String domain = site.getDomain();
-        CloseableHttpClient httpClient = httpClients.get(domain);
-        if (httpClient == null) {
-            synchronized (this) {
-                httpClient = httpClients.get(domain);
-                if (httpClient == null) {
-                    httpClient = httpClientGenerator.getClient(site);
-                    httpClients.put(domain, httpClient);
-                }
-            }
-        }
-        return httpClient;
+        return httpClients.computeIfAbsent(domain,k->httpClientGenerator.getClient(site));
+
     }
 
     @Override
@@ -87,19 +94,37 @@ public class HttpClientDownloader extends AbstractDownloader {
             return page;
         } catch (IOException e) {
             logger.warn("download page {} error", request.getUrl(), e);
-            onError(request);
+            onError(request, e, proxyProvider);
+            if (proxyProvider != null && proxy != null && proxyProvider instanceof RefreshableProxyProvider && refreshProxyOnError.test(e)) {
+                ((RefreshableProxyProvider)proxyProvider).refreshProxy(task,proxy);
+            }
+            if(refreshClientOnError.test(e)) {
+                httpClients.remove(task.getSite().getDomain());
+            }
             return page;
         } finally {
             if (httpResponse != null) {
                 //ensure the connection is released back to pool
                 EntityUtils.consumeQuietly(httpResponse.getEntity());
             }
-            if (proxyProvider != null && proxy != null) {
-                proxyProvider.returnProxy(proxy, page, task);
+            if (proxyProvider != null && proxy != null && proxyProvider instanceof ReturnableProxyProvider) {
+                ((ReturnableProxyProvider) proxyProvider).returnProxy(proxy, page, task);
+
             }
         }
     }
 
+
+    @Override
+    public void refreshComponent(Task task) {
+        if (proxyProvider != null && proxyProvider instanceof RefreshableProxyProvider) {
+            ((RefreshableProxyProvider) proxyProvider).refreshProxy(task, ((RefreshableProxyProvider) proxyProvider).getCurrentProxy(task));
+        }
+
+            httpClients.remove(task.getSite().getDomain());
+
+    }
+
     @Override
     public void setThread(int thread) {
         httpClientGenerator.setPoolSize(thread);
@@ -110,7 +135,7 @@ public class HttpClientDownloader extends AbstractDownloader {
         String contentType = httpResponse.getEntity().getContentType() == null ? "" : httpResponse.getEntity().getContentType().getValue();
         Page page = new Page();
         page.setBytes(bytes);
-        if (!request.isBinaryContent()){
+        if (!request.isBinaryContent()) {
             if (charset == null) {
                 charset = getHtmlCharset(contentType, bytes);
             }

webmagic-core/src/main/java/us/codecraft/webmagic/downloader/HttpClientGenerator.java

@@ -1,13 +1,17 @@
 package us.codecraft.webmagic.downloader;
 
+import java.io.File;
 import java.io.IOException;
 import java.security.KeyManagementException;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
 import java.security.NoSuchAlgorithmException;
 import java.security.cert.CertificateException;
 import java.security.cert.X509Certificate;
 import java.util.Map;
 
 import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLContextSpi;
 import javax.net.ssl.TrustManager;
 import javax.net.ssl.X509TrustManager;
 
@@ -24,6 +28,7 @@ import org.apache.http.conn.socket.ConnectionSocketFactory;
 import org.apache.http.conn.socket.PlainConnectionSocketFactory;
 import org.apache.http.conn.ssl.DefaultHostnameVerifier;
 import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
+import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
 import org.apache.http.impl.client.BasicCookieStore;
 import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
@@ -32,6 +37,7 @@ import org.apache.http.impl.client.HttpClients;
 import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
 import org.apache.http.impl.cookie.BasicClientCookie;
 import org.apache.http.protocol.HttpContext;
+import org.apache.http.ssl.SSLContexts;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -69,7 +75,7 @@ public class HttpClientGenerator {
             return new SSLConnectionSocketFactory(sslContext, supportedProtocols,
                     null,
                     new DefaultHostnameVerifier()); // 优先绕过安全证书
-        } catch (KeyManagementException e) {
+        } catch (KeyManagementException | CertificateException | KeyStoreException | IOException e) {
             logger.error("ssl connection fail", e);
         } catch (NoSuchAlgorithmException e) {
             logger.error("ssl connection fail", e);
@@ -77,8 +83,8 @@ public class HttpClientGenerator {
         return SSLConnectionSocketFactory.getSocketFactory();
 	}
 
-    private SSLContext createIgnoreVerifySSL() throws NoSuchAlgorithmException, KeyManagementException {
-        // 实现一个X509TrustManager接口，用于绕过验证，不用修改里面的方法
+    private SSLContext createIgnoreVerifySSL() throws NoSuchAlgorithmException, KeyManagementException, CertificateException, KeyStoreException, IOException {
+// 实现一个X509TrustManager接口，用于绕过验证，不用修改里面的方法
         X509TrustManager trustManager = new X509TrustManager() {
 
             @Override
@@ -96,10 +102,10 @@ public class HttpClientGenerator {
 
         };
 
-        SSLContext sc = SSLContext.getInstance("TLS");
+        SSLContext sc = SSLContext.getInstance("SSLv3");
         sc.init(null, new TrustManager[] { trustManager }, null);
         return sc;
-	}
+    }
 
     public HttpClientGenerator setPoolSize(int poolSize) {
         connectionManager.setMaxTotal(poolSize);
@@ -137,6 +143,7 @@ public class HttpClientGenerator {
         SocketConfig.Builder socketConfigBuilder = SocketConfig.custom();
         socketConfigBuilder.setSoKeepAlive(true).setTcpNoDelay(true);
         socketConfigBuilder.setSoTimeout(site.getTimeOut());
+
         SocketConfig socketConfig = socketConfigBuilder.build();
         httpClientBuilder.setDefaultSocketConfig(socketConfig);
         connectionManager.setDefaultSocketConfig(socketConfig);

webmagic-core/src/main/java/us/codecraft/webmagic/pipeline/CachePipeline.java

@@ -0,0 +1,18 @@
+package us.codecraft.webmagic.pipeline;
+
+import java.util.Collection;
+
+/**
+ * @author yaoqiang
+ *
+ * 为pipeline提供缓存能力
+ * 在某个时机执行批处理任务
+ */
+public interface CachePipeline<T> extends Pipeline{
+
+    /**
+     * @param collection  缓存批处理
+     *
+     */
+    void process(Collection<T> collection);
+}

webmagic-core/src/main/java/us/codecraft/webmagic/pipeline/CloseableCachePipeline.java

@@ -0,0 +1,87 @@
+package us.codecraft.webmagic.pipeline;
+
+import lombok.extern.slf4j.Slf4j;
+import us.codecraft.webmagic.ResultItems;
+import us.codecraft.webmagic.Task;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ExecutorService;
+
+/**
+ * @author yaoqiang
+ * 提供关闭时刷新能力
+ * <p>
+ * <p>
+ * 不负责创建 {@link ExecutorService},如果需要异步执行，那么需要从外界传入，由外界自己管理 {@link ExecutorService}生命周期
+ * @see ExecutorService
+ */
+@Slf4j
+public abstract class CloseableCachePipeline implements CachePipeline<ResultItems>, Closeable {
+
+
+    private final BlockingQueue<ResultItems> cache;
+
+    private final ExecutorService executorService;
+
+    public CloseableCachePipeline(int max, ExecutorService executorService) {
+        this.cache = new ArrayBlockingQueue<>(max, false);
+        this.executorService = executorService;
+    }
+
+    public CloseableCachePipeline(int max) {
+        this(max, null);
+    }
+
+    /**
+     * @param resultItems 接收到的信息
+     * @param task 执行的任务
+     */
+    @Override
+    public final void process(ResultItems resultItems, Task task) {
+        try {
+            cache.put(resultItems);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+            Thread.currentThread().interrupt();
+            log.error(e.getMessage(), e);
+        }
+        if (cache.remainingCapacity() == 0) {
+            // set 中的resultItem 使用权依然传递了出去，cache的使用全保留，考虑到后面也用不上 resultItem，所以发布出去问题也不大
+            // temp的修改权限被发布，理由同上，想添加，删除都可以，反正以后也用不上了;
+            Set<ResultItems> temp = new HashSet<>(cache);
+            if (executorService != null && !executorService.isShutdown()) {
+                executorService.execute(() -> process(temp, task));
+            } else {
+                process(temp, task);
+            }
+            cache.clear();
+        }
+
+    }
+
+    protected abstract void process(Collection<ResultItems> resultItems, Task task);
+
+    private synchronized void flush(Collection<ResultItems> resultItems) {
+        process(resultItems, null);
+
+    }
+
+    /**
+     * 结合源码，实现关闭时处理剩余的缓存，直接交由主线程处理
+     *
+     * @throws IOException 关闭可能出现异常，由上层处理
+     */
+    @Override
+    public final void close() throws IOException {
+        if (!cache.isEmpty()) {
+            flush(cache);
+            cache.clear();
+        }
+    }
+}

webmagic-core/src/main/java/us/codecraft/webmagic/proxy/AbstractRefreshableProxyProvider.java

@@ -0,0 +1,123 @@
+package us.codecraft.webmagic.proxy;
+
+import lombok.extern.slf4j.Slf4j;
+import us.codecraft.webmagic.Task;
+
+import java.util.Comparator;
+import java.util.concurrent.*;
+import java.util.concurrent.atomic.AtomicReference;
+
+/**
+ * @author yaoqiang
+ * 可刷新的代理提供商抽象实现
+ */
+@Slf4j
+public abstract class AbstractRefreshableProxyProvider implements RefreshableProxyProvider {
+
+
+    private final AtomicReference<FutureTask<Proxy>> usedProxyCache = new AtomicReference<>();
+
+    private final PriorityBlockingQueue<ExpirableProxy> ipQueue = new PriorityBlockingQueue<>(1000, Comparator.comparing(ExpirableProxy::getExpireTime));
+
+
+    protected void doPut(ExpirableProxy expirableProxy) {
+        ipQueue.put(expirableProxy);
+    }
+
+    protected int hostSize() {
+        return ipQueue.size();
+    }
+
+    @Override
+    public void refreshProxy(Task task, Proxy proxy) {
+        if (proxy != null) {
+            FutureTask<Proxy> proxyFutureTask = usedProxyCache.get();
+            Proxy currentProxy = getCurrentProxy(task);
+            // 如果在出错到这里的过程中，usedProxyCache被更新过，proxy 就不可能相等，如果依然相等，说明没有更新过
+            // 可能没有使用代理的情况
+            if (proxy.equals(currentProxy)) {
+                // 如果此时依然没有更新过，就设置为空
+                usedProxyCache.compareAndSet(proxyFutureTask, null);
+            }
+        }
+    }
+
+    @Override
+    public Proxy getCurrentProxy(Task task) {
+        FutureTask<Proxy> cache = usedProxyCache.get();
+        Proxy currentProxy = null;
+        try {
+            if (cache != null)
+                currentProxy = cache.get(5, TimeUnit.SECONDS);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+            log.error(e.getMessage(), e);
+            Thread.currentThread().interrupt();
+        } catch (ExecutionException e) {
+            e.printStackTrace();
+            log.error(e.getCause().getMessage(), e);
+        } catch (TimeoutException e) {
+            log.error(e.getMessage(), e);
+            e.printStackTrace();
+        }
+        return currentProxy;
+    }
+
+
+    private FutureTask<Proxy> buildCacheTask() {
+        return new FutureTask<>(this::doGet);
+    }
+
+
+    /**
+     * 特别注意，防止活锁，集cache中总是抛出异常，那么将无限循环，无限报错
+     *
+     * @param task 下载任务
+     * @return 返回代理
+     */
+    @Override
+    public Proxy getProxy(Task task) {
+        while (!Thread.currentThread().isInterrupted()) {
+            FutureTask<Proxy> cache = usedProxyCache.get();
+            if (cache == null) {
+                FutureTask<Proxy> futureTask = buildCacheTask();
+                if (usedProxyCache.compareAndSet(null, futureTask)) {
+                    cache = futureTask;
+                    futureTask.run();
+                } else {
+                    // 交换失败，需要更新到最新数据
+                    cache = usedProxyCache.get();
+                }
+            }
+            try {
+                if (cache != null) {
+
+                    ExpirableProxy proxy = (ExpirableProxy) cache.get(5, TimeUnit.SECONDS);
+                    if (!proxy.isExpire())
+                        return proxy;
+                }
+                usedProxyCache.compareAndSet(cache, null);
+            } catch (InterruptedException e) {
+                Thread.currentThread().interrupt();
+                log.error(e.getMessage(), e);
+                usedProxyCache.compareAndSet(cache, null);
+            } catch (ExecutionException e) {
+                log.error(e.getMessage(), e);
+                usedProxyCache.compareAndSet(cache, null);
+            } catch (TimeoutException e) {
+                log.error(e.getMessage(), e);
+            }
+        }
+        return null;
+    }
+
+    private Proxy doGet() throws InterruptedException {
+        ExpirableProxy proxy;
+        do {
+            proxy = ipQueue.take();
+        } while (proxy.isExpire());
+        return proxy;
+    }
+
+
+}

webmagic-core/src/main/java/us/codecraft/webmagic/proxy/ExpirableProxy.java

@@ -0,0 +1,36 @@
+package us.codecraft.webmagic.proxy;
+
+import lombok.Getter;
+import org.apache.http.annotation.Contract;
+import org.apache.http.annotation.ThreadingBehavior;
+
+import java.time.LocalDateTime;
+import java.time.temporal.ChronoUnit;
+
+/**
+ * @author yaoqiang
+ *
+ * 可以过期的代理
+ */
+@Contract(threading = ThreadingBehavior.IMMUTABLE_CONDITIONAL)
+public class ExpirableProxy extends Proxy {
+    @Getter
+    private final int ttl;
+    private final LocalDateTime expireTime;
+
+
+    public ExpirableProxy(String host, int port, int ttl, ChronoUnit chronoUnit) {
+        super(host, port);
+        this.ttl = ttl;
+        this.expireTime = LocalDateTime.now().plus(ttl, chronoUnit);
+
+    }
+
+    public boolean isExpire() {
+        return LocalDateTime.now().isAfter(expireTime);
+    }
+    public LocalDateTime getExpireTime(){
+        return expireTime;
+    }
+
+}

webmagic-core/src/main/java/us/codecraft/webmagic/proxy/Proxy.java

@@ -6,33 +6,30 @@ import java.net.URISyntaxException;
 import java.net.URLEncoder;
 import java.nio.charset.StandardCharsets;
 
+import jdk.nashorn.internal.ir.annotations.Immutable;
 import org.apache.commons.lang3.StringUtils;
+import org.apache.http.annotation.Contract;
+import org.apache.http.annotation.ThreadingBehavior;
 
+@Contract(threading = ThreadingBehavior.IMMUTABLE)
 public class Proxy {
 
-    private String scheme;
+    private final String scheme;
 
-    private String host;
+    private final String host;
 
-    private int port;
+    private final int port;
 
-    private String username;
+    private final String username;
 
-    private String password;
+    private final String password;
 
-    public static Proxy create(final URI uri) {
-        Proxy proxy = new Proxy(uri.getHost(), uri.getPort(), uri.getScheme());
-        String userInfo = uri.getUserInfo();
-        if (userInfo != null) {
-            String[] up = userInfo.split(":");
-            if (up.length == 1) {
-                proxy.username = up[0].isEmpty() ? null : up[0];
-            } else {
-                proxy.username = up[0].isEmpty() ? null : up[0];
-                proxy.password = up[1].isEmpty() ? null : up[1];
-            }
-        }
-        return proxy;
+    public Proxy(String host, int port, String scheme, String username, String password) {
+        this.scheme = scheme;
+        this.host = host;
+        this.port = port;
+        this.username = username;
+        this.password = password;
     }
 
     public Proxy(String host, int port) {
@@ -40,27 +37,30 @@ public class Proxy {
     }
 
     public Proxy(String host, int port, String scheme) {
-        this.host = host;
-        this.port = port;
-        this.scheme = scheme;
+        this(host, port, scheme, null, null);
     }
 
     public Proxy(String host, int port, String username, String password) {
-        this.host = host;
-        this.port = port;
-        this.username = username;
-        this.password = password;
+        this(host, port, null, username, password);
     }
 
-    public String getScheme() {
-        return scheme;
-    }
-
-    public void setScheme(String scheme) {
-        this.scheme = scheme;
+    public static Proxy create(final URI uri) {
+        String userInfo = uri.getUserInfo();
+        String username = null;
+        String password = null;
+        if (userInfo != null) {
+            String[] up = userInfo.split(":");
+            if (up.length == 1) {
+                username = up[0].isEmpty() ? null : up[0];
+            } else {
+                username = up[0].isEmpty() ? null : up[0];
+                password = up[1].isEmpty() ? null : up[1];
+            }
+        }
+        return new Proxy(uri.getHost(), uri.getPort(), uri.getScheme(), username, password);
     }
 
-	public String getHost() {
+    public String getHost() {
         return host;
     }
 
@@ -68,6 +68,8 @@ public class Proxy {
         return port;
     }
 
+    public String getScheme(){return scheme;}
+
     public String getUsername() {
         return username;
     }

webmagic-core/src/main/java/us/codecraft/webmagic/proxy/ProxyProvider.java

@@ -1,6 +1,5 @@
 package us.codecraft.webmagic.proxy;
 
-import us.codecraft.webmagic.Page;
 import us.codecraft.webmagic.Task;
 
 /**
@@ -10,14 +9,6 @@ import us.codecraft.webmagic.Task;
  */
 public interface ProxyProvider {
 
-    /**
-     *
-     * Return proxy to Provider when complete a download.
-     * @param proxy the proxy config contains host,port and identify info
-     * @param page the download result
-     * @param task the download task
-     */
-    void returnProxy(Proxy proxy, Page page, Task task);
 
     /**
      * Get a proxy for task by some strategy.

webmagic-core/src/main/java/us/codecraft/webmagic/proxy/RefreshableProxyProvider.java

@@ -0,0 +1,30 @@
+package us.codecraft.webmagic.proxy;
+
+import us.codecraft.webmagic.Task;
+
+/**
+ * @author yaoqiang
+ *
+ * 可以手动刷新的代理供应商
+ */
+public interface RefreshableProxyProvider extends ProxyProvider{
+
+    /**
+     *  代理IP是珍贵资源，有可能代理提供者内部代理没有过期，就一直提供某个IP，但这个IP又不可以使用，所以提供一种方式通知提供者，这个代理该刷新了
+     *
+     * @param task  爬虫任务
+     * @param proxy 需要对代理进行验证，如果确实持有的时错误代理，则刷新，否则，继续执行
+     */
+    void refreshProxy(Task task,Proxy proxy);
+
+
+    /**
+     *
+     * 获取当前正在提供的代理
+     *
+     * @param task 工作中的爬虫任务
+     * @return 获取当前正在使用的代理
+     */
+    Proxy getCurrentProxy(Task task);
+
+}

webmagic-core/src/main/java/us/codecraft/webmagic/proxy/ReturnableProxyProvider.java

@@ -0,0 +1,22 @@
+package us.codecraft.webmagic.proxy;
+
+import us.codecraft.webmagic.Page;
+import us.codecraft.webmagic.Task;
+
+/**
+ * @author yaoqiang
+ *
+ * 可归还的代理提供商，代理被取出后，实用完成，可以归还给代理提供商
+ */
+public interface ReturnableProxyProvider {
+
+    /**
+     *
+     * Return proxy to Provider when complete a download.
+     * @param proxy the proxy config contains host,port and identify info
+     * @param page the download result
+     * @param task the download task
+     */
+    void returnProxy(Proxy proxy, Page page, Task task);
+
+}

webmagic-core/src/main/java/us/codecraft/webmagic/proxy/SimpleProxyProvider.java

@@ -1,6 +1,5 @@
 package us.codecraft.webmagic.proxy;
 
-import us.codecraft.webmagic.Page;
 import us.codecraft.webmagic.Task;
 
 import java.util.ArrayList;
@@ -30,6 +29,7 @@ public class SimpleProxyProvider implements ProxyProvider {
         this.pointer = pointer;
     }
 
+
     public static SimpleProxyProvider from(Proxy... proxies) {
         List<Proxy> proxiesTemp = new ArrayList<Proxy>(proxies.length);
         for (Proxy proxy : proxies) {
@@ -38,11 +38,6 @@ public class SimpleProxyProvider implements ProxyProvider {
         return new SimpleProxyProvider(Collections.unmodifiableList(proxiesTemp));
     }
 
-    @Override
-    public void returnProxy(Proxy proxy, Page page, Task task) {
-        //Donothing
-    }
-
     @Override
     public Proxy getProxy(Task task) {
         return proxies.get(incrForLoop());

webmagic-core/src/main/java/us/codecraft/webmagic/utils/HttpConstant.java

@@ -28,6 +28,7 @@ public abstract class HttpConstant {
     public static abstract class StatusCode {
 
         public static final int CODE_200 = 200;
+        public static final int FORBIDDEN = 403;
 
     }
 

webmagic-core/src/test/java/us/codecraft/webmagic/SpiderTest.java

@@ -57,6 +57,11 @@ public class SpiderTest {
                 return Site.me().setSleepTime(0);
             }
         }).setDownloader(new Downloader() {
+            @Override
+            public void refreshComponent(Task task) {
+
+            }
+
             @Override
             public Page download(Request request, Task task) {
                 return new Page().setRawText("");

webmagic-core/src/test/java/us/codecraft/webmagic/downloader/MockGithubDownloader.java

@@ -28,6 +28,11 @@ public class MockGithubDownloader implements Downloader {
         return page;
     }
 
+    @Override
+    public void refreshComponent(Task task) {
+
+    }
+
     @Override
     public void setThread(int threadNum) {
     }

webmagic-extension/src/main/java/us/codecraft/webmagic/downloader/PhantomJSDownloader.java

@@ -42,7 +42,12 @@ public class PhantomJSDownloader extends AbstractDownloader {
         this.initPhantomjsCrawlPath();
         PhantomJSDownloader.phantomJsCommand = phantomJsCommand;
     }
-    
+
+    @Override
+    public void refreshComponent(Task task) {
+
+    }
+
     /**
      * 新增构造函数，支持crawl.js路径自定义，因为当其他项目依赖此jar包时，runtime.exec()执行phantomjs命令时无使用法jar包中的crawl.js
      * <pre>

webmagic-extension/src/test/java/us/codecraft/webmagic/downloader/MockGithubDownloader.java

@@ -9,6 +9,10 @@ import us.codecraft.webmagic.selector.PlainText;
  * @author code4crafter@gmail.com
  */
 public class MockGithubDownloader implements Downloader{
+    @Override
+    public void refreshComponent(Task task) {
+
+    }
 
     private String html = "\n" +
             "\n" +

webmagic-selenium/src/main/java/us/codecraft/webmagic/downloader/selenium/SeleniumDownloader.java

@@ -59,6 +59,11 @@ public class SeleniumDownloader implements Downloader, Closeable {
 		// "/Users/Bingo/Downloads/phantomjs-1.9.7-macosx/bin/phantomjs");
 	}
 
+	@Override
+	public void refreshComponent(Task task) {
+
+	}
+
 	/**
 	 * set sleep time to wait until load success
 	 *