ACE/examples/Web_Crawler/HTTP_URL.h

   1 /* -*- C++ -*- */
   2
   3 //=============================================================================
   4 /**
   5  *  @file    HTTP_URL.h
   6  *
   7  *  @author Douglas C. Schmidt <d.schmidt@vanderbilt.edu>
   8  */
   9 //=============================================================================
  10
  11
  12 #ifndef _HTTP_URL_H
  13 #define _HTTP_URL_H
  14
  15 #include "URL_Status.h"
  16 #include "URL.h"
  17 #include "Options.h"
  18
  19 #if !defined (ACE_LACKS_PRAGMA_ONCE)
  20 #pragma once
  21 #endif /* ACE_LACKS_PRAGMA_ONCE */
  22
  23 /**
  24  * @class HTTP_URL
  25  *
  26  * @brief An ADT for an HTTP URL.
  27  *
  28  * This class plays the "element" role in the Visitor pattern.
  29  */
  30 class HTTP_URL : public URL
  31 {
  32 public:
  33   /**
  34    * The <url_addr> is the URL that we're going to be visiting.  We
  35    * also keep track of the containing page, if any, which is used to
  36    * print out more meaningful messages.
  37    */
  38   HTTP_URL (const ACE_URL_Addr &url_addr,
  39             HTTP_URL *containing_page = 0);
  40
  41   /**
  42    * Accept the visitor, which will then perform a particular
  43    * visitation strategy on the URL.  This method is part of the
  44    * Visitor pattern.
  45    */
  46   virtual int accept (URL_Visitor *visitor);
  47
  48   /// Send a <GET> command to fetch the contents in the URI from the
  49   /// server.
  50   virtual ssize_t send_request ();
  51
  52   /// Returns the URL that we represent.
  53   virtual const ACE_URL_Addr &url_addr () const;
  54
  55   /// Commit suicide
  56   int destroy ();
  57 private:
  58   /// Address of the URL we're connected to.
  59   ACE_URL_Addr url_addr_;
  60
  61   /// Page that contained us.
  62   HTTP_URL *containing_page_;
  63 };
  64
  65 #endif /* _HTTP_URL_H */