Hessian源码分析--HessianProxyFactory

HessianProxyFactory是HessianProxy的工厂类，其通过HessianProxy来生成代理类。

如下面代码：

HessianProxyFactory factory = new HessianProxyFactory();HelloService helloService = (HelloService) factory.create(HelloService.class, url);System.out.println(helloService.helloWorld("jimmy"));

HessianProxyFactory的create函数如下：

public Object create(Class api, String urlName)    throws MalformedURLException  {    return create(api, urlName, _loader);  }

public Object create(Class<?> api, String urlName, ClassLoader loader)    throws MalformedURLException  {    URL url = new URL(urlName);        return create(api, url, loader);  }

create函数的最终实现是：

public Object create(Class<?> api, URL url, ClassLoader loader)  {    if (api == null)      throw new NullPointerException("api must not be null for HessianProxyFactory.create()");    InvocationHandler handler = null;    handler = new HessianProxy(url, this, api);    return Proxy.newProxyInstance(loader,                                  new Class[] { api,                                                HessianRemoteObject.class },                                  handler);  }

由上面代码段我们可以看到，HessianProxyFactory的create函数最终是创建了一个HessianProxy代理类的目标类。

HessianProxyFactory的作用就是通过代理类HessianProxy来生成目标类。

HessianProxyFactory源码如下：

public class HessianProxyFactory implements ServiceProxyFactory, ObjectFactory {  protected static Logger log    = Logger.getLogger(HessianProxyFactory.class.getName());  private final ClassLoader _loader;    private SerializerFactory _serializerFactory;  private HessianConnectionFactory _connFactory;    private HessianRemoteResolver _resolver;  private String _user;  private String _password;  private String _basicAuth;  private boolean _isOverloadEnabled = false;  private boolean _isHessian2Reply = true;  private boolean _isHessian2Request = false;  private boolean _isChunkedPost = true;  private boolean _isDebug = false;  private long _readTimeout = -1;  private long _connectTimeout = -1;  public HessianProxyFactory()  {    this(Thread.currentThread().getContextClassLoader());  }  public HessianProxyFactory(ClassLoader loader)  {    _loader = loader;    _resolver = new HessianProxyResolver(this);  }  public void setUser(String user)  {    _user = user;    _basicAuth = null;  }  public void setPassword(String password)  {    _password = password;    _basicAuth = null;  }  public String getBasicAuth()  {    if (_basicAuth != null)      return _basicAuth;    else if (_user != null && _password != null)      return "Basic " + base64(_user + ":" + _password);    else      return null;  }  public void setConnectionFactory(HessianConnectionFactory factory)  {    _connFactory = factory;  }  public HessianConnectionFactory getConnectionFactory()  {    if (_connFactory == null) {      _connFactory = createHessianConnectionFactory();      _connFactory.setHessianProxyFactory(this);    }        return _connFactory;  }  public void setDebug(boolean isDebug)  {    _isDebug = isDebug;  }  public boolean isDebug()  {    return _isDebug;  }  /**   * Returns true if overloaded methods are allowed (using mangling)   */  public boolean isOverloadEnabled()  {    return _isOverloadEnabled;  }  /**   * set true if overloaded methods are allowed (using mangling)   */  public void setOverloadEnabled(boolean isOverloadEnabled)  {    _isOverloadEnabled = isOverloadEnabled;  }  /**   * Set true if should use chunked encoding on the request.   */  public void setChunkedPost(boolean isChunked)  {    _isChunkedPost = isChunked;  }  /**   * Set true if should use chunked encoding on the request.   */  public boolean isChunkedPost()  {    return _isChunkedPost;  }  /**   * The socket timeout on requests in milliseconds.   */  public long getReadTimeout()  {    return _readTimeout;  }  /**   * The socket timeout on requests in milliseconds.   */  public void setReadTimeout(long timeout)  {    _readTimeout = timeout;  }  /**   * The socket connection timeout in milliseconds.   */  public long getConnectTimeout()  {    return _connectTimeout;  }  /**   * The socket connect timeout in milliseconds.   */  public void setConnectTimeout(long timeout)  {    _connectTimeout = timeout;  }  /**   * True if the proxy can read Hessian 2 responses.   */  public void setHessian2Reply(boolean isHessian2)  {    _isHessian2Reply = isHessian2;  }  /**   * True if the proxy should send Hessian 2 requests.   */  public void setHessian2Request(boolean isHessian2)  {    _isHessian2Request = isHessian2;    if (isHessian2)      _isHessian2Reply = true;  }  /**   * Returns the remote resolver.   */  public HessianRemoteResolver getRemoteResolver()  {    return _resolver;  }  /**   * Sets the serializer factory.   */  public void setSerializerFactory(SerializerFactory factory)  {    _serializerFactory = factory;  }  /**   * Gets the serializer factory.   */  public SerializerFactory getSerializerFactory()  {    if (_serializerFactory == null)      _serializerFactory = new SerializerFactory(_loader);    return _serializerFactory;  }  protected HessianConnectionFactory createHessianConnectionFactory()  {    String className      = System.getProperty(HessianConnectionFactory.class.getName());    HessianConnectionFactory factory = null;          try {      if (className != null) {        ClassLoader loader = Thread.currentThread().getContextClassLoader();        Class<?> cl = Class.forName(className, false, loader);        factory = (HessianConnectionFactory) cl.newInstance();        return factory;      }    } catch (Exception e) {      throw new RuntimeException(e);    }    return new HessianURLConnectionFactory();  }   public Object create(String url)    throws MalformedURLException, ClassNotFoundException  {    HessianMetaInfoAPI metaInfo;    metaInfo = (HessianMetaInfoAPI) create(HessianMetaInfoAPI.class, url);    String apiClassName =      (String) metaInfo._hessian_getAttribute("java.api.class");    if (apiClassName == null)      throw new HessianRuntimeException(url + " has an unknown api.");    Class<?> apiClass = Class.forName(apiClassName, false, _loader);    return create(apiClass, url);  }  public Object create(Class api, String urlName)    throws MalformedURLException  {    return create(api, urlName, _loader);  }  public Object create(Class<?> api, String urlName, ClassLoader loader)    throws MalformedURLException  {    URL url = new URL(urlName);        return create(api, url, loader);  }  public Object create(Class<?> api, URL url, ClassLoader loader)  {    if (api == null)      throw new NullPointerException("api must not be null for HessianProxyFactory.create()");    InvocationHandler handler = null;    handler = new HessianProxy(url, this, api);    return Proxy.newProxyInstance(loader,                                  new Class[] { api,                                                HessianRemoteObject.class },                                  handler);  }  public AbstractHessianInput getHessianInput(InputStream is)  {    return getHessian2Input(is);  }  public AbstractHessianInput getHessian1Input(InputStream is)  {    AbstractHessianInput in;    if (_isDebug)      is = new HessianDebugInputStream(is, new PrintWriter(System.out));    in = new HessianInput(is);    in.setRemoteResolver(getRemoteResolver());    in.setSerializerFactory(getSerializerFactory());    return in;  }  public AbstractHessianInput getHessian2Input(InputStream is)  {    AbstractHessianInput in;    if (_isDebug)      is = new HessianDebugInputStream(is, new PrintWriter(System.out));    in = new Hessian2Input(is);    in.setRemoteResolver(getRemoteResolver());    in.setSerializerFactory(getSerializerFactory());    return in;  }  public AbstractHessianOutput getHessianOutput(OutputStream os)  {    AbstractHessianOutput out;    if (_isHessian2Request)      out = new Hessian2Output(os);    else {      HessianOutput out1 = new HessianOutput(os);      out = out1;      if (_isHessian2Reply)        out1.setVersion(2);    }    out.setSerializerFactory(getSerializerFactory());    return out;  }  public Object getObjectInstance(Object obj, Name name,                                  Context nameCtx, Hashtable<?,?> environment)    throws Exception  {    Reference ref = (Reference) obj;    String api = null;    String url = null;        for (int i = 0; i < ref.size(); i++) {      RefAddr addr = ref.get(i);      String type = addr.getType();      String value = (String) addr.getContent();      if (type.equals("type"))        api = value;      else if (type.equals("url"))        url = value;      else if (type.equals("user"))        setUser(value);      else if (type.equals("password"))        setPassword(value);    }    if (url == null)      throw new NamingException("`url' must be configured for HessianProxyFactory.");    // XXX: could use meta protocol to grab this    if (api == null)      throw new NamingException("`type' must be configured for HessianProxyFactory.");    Class apiClass = Class.forName(api, false, _loader);    return create(apiClass, url);  }  private String base64(String value)  {    StringBuffer cb = new StringBuffer();    int i = 0;    for (i = 0; i + 2 < value.length(); i += 3) {      long chunk = (int) value.charAt(i);      chunk = (chunk << 8) + (int) value.charAt(i + 1);      chunk = (chunk << 8) + (int) value.charAt(i + 2);      cb.append(encode(chunk >> 18));      cb.append(encode(chunk >> 12));      cb.append(encode(chunk >> 6));      cb.append(encode(chunk));    }    if (i + 1 < value.length()) {      long chunk = (int) value.charAt(i);      chunk = (chunk << 8) + (int) value.charAt(i + 1);      chunk <<= 8;      cb.append(encode(chunk >> 18));      cb.append(encode(chunk >> 12));      cb.append(encode(chunk >> 6));      cb.append('=');    }    else if (i < value.length()) {      long chunk = (int) value.charAt(i);      chunk <<= 16;      cb.append(encode(chunk >> 18));      cb.append(encode(chunk >> 12));      cb.append('=');      cb.append('=');    }    return cb.toString();  }  public static char encode(long d)  {    d &= 0x3f;    if (d < 26)      return (char) (d + 'A');    else if (d < 52)      return (char) (d + 'a' - 26);    else if (d < 62)      return (char) (d + '0' - 52);    else if (d == 62)      return '+';    else      return '/';  }}