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

// ============================================================================
//
// = LIBRARY
//    ace
//
// = FILENAME
//    MEM_Stream.h
//
// = AUTHOR
//    Nanbor Wang <nanbor@cs.wustl.edu>
//
// ============================================================================

#ifndef ACE_MEM_STREAM_H
#define ACE_MEM_STREAM_H
#include "ace/pre.h"

#include "ace/MEM_IO.h"

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

#include "ace/INET_Addr.h"

class ACE_MEM_Acceptor;
class ACE_MEM_Connector;

class ACE_Export ACE_MEM_Stream : public ACE_MEM_IO
{
  // = TITLE
  //     Defines the methods in the <ACE_MEM_Stream> abstraction.
  //
  // = DESCRIPTION
  //     This adds additional wrapper methods atop the <ACE_MEM_IO>
  //     class.
public:

  friend class ACE_MEM_Acceptor;
  friend class ACE_MEM_Connector;

  // Initialization and termination methods.
  ACE_MEM_Stream (void);
  // Constructor.

  ACE_MEM_Stream (ACE_HANDLE h);
  // Constructor (sets the underlying <ACE_HANDLE> with <h>).

  ~ACE_MEM_Stream (void);
  // Destructor.

  //= The following two methods use write and read system calls.
  ssize_t send_n (const void *buf, int n);
  // Send n bytes, keep trying until n are sent.
  ssize_t recv_n (void *buf, int n);
  // Recv n bytes, keep trying until n are received.

  // = The following two methods use the send and recv system calls.
  ssize_t send_n (const void *buf, int n, int flags);
  // Send n bytes, keep trying until n are sent.
  ssize_t recv_n (void *buf, int n, int flags);
  // Recv n bytes, keep trying until n are received.

/*
  ssize_t send_n (const void *buf,
                  size_t len,
                  int flags,
                  const ACE_Time_Value *timeout);
  // Try to send exactly <len> bytes into <buf> from <handle> (uses
  // the <send> call).  If <send> blocks for longer than <timeout> the
  // number of bytes actually sent is returned with <errno == ETIME>.
  // If a timeout does not occur, <send_n> return <len> (i.e., the
  // number of bytes requested to be sent).

  ssize_t recv_n (void *buf,
                  size_t len,
                  int flags,
                  const ACE_Time_Value *timeout);
  // Try to recv exactly <len> bytes into <buf> from <handle> (uses
  // the <ACE::recv_n> call).  The <ACE_Time_Value> indicates how long
  // to blocking trying to receive.  If <timeout> == 0, the caller
  // will block until action is possible, else will wait until the
  // relative time specified in *<timeout> elapses).  If <recv> blocks
  // for longer than <timeout> the number of bytes actually read is
  // returned with <errno == ETIME>.  If a timeout does not occur,
  // <recv_n> return <len> (i.e., the number of bytes requested to be
  // read).

  ssize_t sendv_n (const iovec iov[],
                   size_t n) const;
  // Send an <iovec> of size <n> to the connected socket (uses
  // <ACE::sendv_n>).  Will block until all bytes are sent or an error
  // occurs.

  ssize_t recvv_n (iovec iov[],
                   size_t n) const;
  // Receive an <iovec> of size <n> to the connected socket.
*/
  // = Selectively close endpoints.
  int close_reader (void);
  // Close down the reader.
  int close_writer (void);
  // Close down the writer.

  int close (void);
  // Close down the socket (we need this to make things work correctly
  // on Win32, which requires use to do a <close_writer> before doing
  // the close to avoid losing data).

  // = Meta-type info
  typedef ACE_Addr PEER_ADDR;

  void dump (void) const;
  // Dump the state of an object.

  ACE_ALLOC_HOOK_DECLARE;
  // Declare the dynamic allocation hooks.
};

#if !defined (ACE_LACKS_INLINE_FUNCTIONS)
#include "ace/MEM_Stream.i"
#endif /* ACE_LACKS_INLINE_FUNCTIONS */

#include "ace/post.h"
#endif /* ACE_MEM_STREAM_H */