path: root/ace/IOStream_T.h

/* -*- C++ -*- */
// $Id$

// ============================================================================
//
// = LIBRARY
//    ace
//
// = FILENAME
//    IOStream_T.h
//
// = AUTHOR
//    James CE Johnson <jcej@lads.com> and Jim Crossley <jim@lads.com>
//
// = NOTE
//    This file should not be #included directly by application code.
//    Instead, it should #include "ace/IOStream.h".  That's because
//    we only put some conditional compilations in that file.
//
// ============================================================================

#ifndef ACE_IOSTREAM_T_H
#define ACE_IOSTREAM_T_H

#include "ace/IOStream.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#if !defined (ACE_LACKS_ACE_IOSTREAM)

#if defined (ACE_HAS_STRING_CLASS)
template <class STREAM> STREAM & operator>> (STREAM &stream, ACE_Quoted_String &str);
template <class STREAM> STREAM & operator<< (STREAM &stream, ACE_Quoted_String &str);
#endif /* defined (ACE_HAS_STRING_CLASS) */

template <class STREAM>
class ACE_Streambuf_T : public ACE_Streambuf
{
public:
  ACE_Streambuf_T (STREAM *peer,
                   u_int streambuf_size = ACE_STREAMBUF_SIZE,
                   int io_mode = ios::in | ios::out);
  // We will be given a STREAM by the iostream object which creates
  // us.  See the ACE_IOStream template for how that works.  Like
  // other streambuf objects, we can be input-only, output-only or
  // both.

  virtual ssize_t send (char *buf, ssize_t len);

  virtual ssize_t recv (char *buf,
                        ssize_t len,
                        ACE_Time_Value *tv = NULL);

  virtual ssize_t recv (char *buf,
                        ssize_t len,
                        int flags,
                        ACE_Time_Value * tv = NULL);

  virtual ssize_t recv_n (char *buf,
                          ssize_t len,
                          int flags = 0,
                          ACE_Time_Value *tv = NULL);

protected:
  virtual ACE_HANDLE get_handle (void);

  STREAM *peer_;
  // This will be our ACE_SOCK_Stream or similar object.
};

template <class STREAM>
class ACE_IOStream : public iostream, public STREAM
{
  // = TITLE
  //     A template adapter for creating an iostream-like object using
  //     an ACE IPC Stream for the actual I/O.  Iostreams use an
  //     underlying streambuf object for the IO interface.  The
  //     iostream class and derivatives provide you with a host of
  //     convenient operators that access the streambuf.
  //
  // = DESCRIPTION
  //     We inherit all characteristics of iostream and your <STREAM>
  //     class.  When you create a new class from this template, you
  //     can use it anywhere you would have used your original
  //     <STREAM> class.
  //
  //     To create an iostream for your favorite ACE IPC class (e.g.,
  //     <ACE_SOCK_Stream>), feed that class to this template's
  //     <STREAM> parameter, e.g.,
  //
  //     typedef ACE_Svc_Handler<ACE_SOCK_iostream,
  //                             ACE_INET_Addr, ACE_NULL_SYNCH>
  //             Service_Handler;
  //
  //     Because the operators in the iostream class are not virtual,
  //     you cannot easily provide overloads in your custom
  //     ACE_IOStream classes.  To make these things work correctly,
  //     you need to overload ALL operators of the ACE_IOStream you
  //     create. I've attempted to do that here to make things easier
  //     for you but there are no guarantees.
  //
  //     In the iostream.cpp file is an example of why it is necessary
  //     to overload all of the get/put operators when you want to
  //     customize only one or two.
public:
  // = Initialization and termination methods.
  ACE_IOStream (STREAM &stream,
                  u_int streambuf_size = ACE_STREAMBUF_SIZE);

  ACE_IOStream (u_int streambuf_size = ACE_STREAMBUF_SIZE);
  // The default constructor.  This will initiailze your STREAM and
  // then setup the iostream baseclass to use a custom streambuf based
  // on STREAM.

  virtual ~ACE_IOStream (void);
  // We have to get rid of the <streambuf_> ourselves since we gave it
  // to the <iostream> base class;

  virtual int close (void);
  // The only ambituity in the multiple inheritance is the <close>
  // function.

  int eof (void) const;
  // Returns 1 if we're at the end of the <STREAM>, i.e., if the
  // connection has closed down or an error has occurred, else 0.
  // Under the covers, <eof> calls the streambuf's <timeout> function
  // which will reset the timeout flag.  As as result, you should save
  // the return of <eof> and check it instead of calling <eof>
  // successively.

#if defined (ACE_HAS_STRING_CLASS)
  virtual ACE_IOStream<STREAM> &operator>> (ACE_IOStream_String &v);
  // A simple string operator.  The base <iostream> has them for char*
  // but that isn't always the best thing for a <String>.  If we don't
  // provide our own here, we may not get what we want.

  virtual ACE_IOStream<STREAM> &operator<< (ACE_IOStream_String &v);
  // The converse of the <String::put> operator.

#endif /* ACE_HAS_STRING_CLASS */
  // = Using the macros to provide get/set operators.
  GETPUT_FUNC_SET (ACE_IOStream<STREAM>)

#if defined (ACE_LACKS_IOSTREAM_FX)
  virtual int ipfx (int noskip = 0)
    {
      if (good ())
        {
          if (tie () != 0)
             tie ()->flush ();
          if (!noskip && flags () & skipws)
            {
              int ch;
              while (isspace (ch = rdbuf ()->sbumpc ()))
                continue;
              if (ch != EOF)
                  rdbuf ()->sputbackc (ch);
            }
          if (good ())
              return 1;
        }
#if !defined (ACE_WIN32)
      // MS VC++ 5.0 doesn't declare setstate.
      setstate (failbit);
#endif /* !ACE_WIN32 */
      return (0);
    }
  virtual int ipfx0 (void)         {  return ipfx (0); }  // Optimized ipfx(0)
  virtual int ipfx1 (void)                                // Optimized ipfx(1)
    {
      if (good ())
        {
          if (tie () != 0)
             tie ()->flush ();
          if (good ())
              return 1;
        }
#if !defined (ACE_WIN32) 
      // MS VC++ 5.0 doesn't declare setstate.
      setstate (failbit);
#endif /* !ACE_WIN32 */
      return (0);
    }
  virtual void isfx (void) {  return; }
  virtual int opfx (void)
    {
      if (good () && tie () != 0)
        tie ()->flush ();
      return good ();
    }
  virtual void osfx (void) {  if (flags () & unitbuf) flush (); }
#else
#if defined (__GNUC__)
  virtual int ipfx0 (void) { return iostream::ipfx0 (); }  // Optimized ipfx(0)
  virtual int ipfx1 (void) { return iostream::ipfx1 (); }  // Optimized ipfx(1)
#else
  virtual int ipfx0 (void) { return iostream::ipfx (0); }
  virtual int ipfx1 (void) { return iostream::ipfx (1); }
#endif /* __GNUC__ */
  virtual int ipfx (int need = 0) {  return iostream::ipfx (need); }
  virtual void isfx (void)        {  iostream::isfx (); }
  virtual int opfx (void)         {  return iostream::opfx (); }
  virtual void osfx (void)        {  iostream::osfx (); }
#endif /* ACE_LACKS_IOSTREAM_FX */

  ACE_IOStream<STREAM> & operator>> (ACE_Time_Value *&tv);
  // Allow the programmer to provide a timeout for read operations.
  // Give it a pointer to NULL to block forever.

protected:
  ACE_Streambuf_T<STREAM> *streambuf_;
  // This is where all of the action takes place.  The streambuf_ is
  // the interface to the underlying STREAM.

private:
  // = Private methods.

  // We move these into the private section so that they cannot be
  // used by the application programmer.  This is necessary because
  // streambuf_ will be buffering IO on the STREAM object.  If these
  // functions were used in your program, there is a danger of getting
  // the datastream out of sync.
  ACE_UNIMPLEMENTED_FUNC (ssize_t send (...))
  ACE_UNIMPLEMENTED_FUNC (ssize_t recv (...))
  ACE_UNIMPLEMENTED_FUNC (ssize_t send_n (...))
  ACE_UNIMPLEMENTED_FUNC (ssize_t recv_n (...))
};

template <class STREAM>
class ACE_SOCK_Dgram_SC : public STREAM
{
  // = TITLE
  //   "Dgram_SC" is short for "Datagram Self-Contained."
  //
  // = DESCRIPTION
  //   Datagrams don't have the notion of a "peer".  Each send and
  //   receive on a datagram can go to a different peer if you want.
  //   If you're using datagrams for stream activity, you probably
  //   want 'em all to go to (and come from) the same place.  That's
  //   what this class is for.  Here, we keep an address object so
  //   that we can remember who last sent us data.  When we write
  //   back, we're then able to write back to that same address.
public:
  ACE_SOCK_Dgram_SC (void);
  ACE_SOCK_Dgram_SC (STREAM &source,
                     ACE_INET_Addr &dest);
  ssize_t send_n (char *buf, ssize_t len);
  ssize_t recv  (char *buf,
                 ssize_t len,
                 ACE_Time_Value *tv = NULL);
  ssize_t recv (char *buf,
                ssize_t len,
                int flags,
                ACE_Time_Value *tv = NULL);
  ssize_t recv_n (char *buf,
                  ssize_t len,
                  int flags = 0,
                  ACE_Time_Value *tv = NULL);
  int get_remote_addr (ACE_INET_Addr &addr) const;

protected:
  ACE_INET_Addr peer_;
};

#if defined (__ACE_INLINE__)
#include "ace/IOStream_T.i"
#endif /* __ACE_INLINE__ */

#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/IOStream_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */

#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("IOStream_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* ACE_LACKS_ACE_IOSTREAM */
#endif /* ACE_IOSTREAM_T_H */