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ACE_IOStream< STREAM > Class Template Reference

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. More...

#include <IOStream_T.h>

List of all members.

Public Member Functions

 ACE_IOStream (STREAM &stream, u_int streambuf_size=ACE_STREAMBUF_SIZE)
 ACE_IOStream (u_int streambuf_size=ACE_STREAMBUF_SIZE)
virtual ~ACE_IOStream (void)
virtual int close (void)
int eof (void) const
virtual int ipfx0 (void)
virtual int ipfx1 (void)
virtual int ipfx (int need=0)
virtual void isfx (void)
virtual int opfx (void)
virtual void osfx (void)
ACE_IOStream< STREAM > & operator>> (ACE_Time_Value *&tv)

Protected Attributes

ACE_Streambuf_T< STREAM > * streambuf_

Private Member Functions

ssize_t send (...)
ssize_t recv (...)
ssize_t send_n (...)
ssize_t recv_n (...)

Detailed Description

template<class STREAM>
class ACE_IOStream< STREAM >

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.

We inherit all characteristics of iostream and your class. When you create a new class from this template, you can use it anywhere you would have used your original class. To create an iostream for your favorite ACE IPC class (e.g., ), feed that class to this template's 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.

Definition at line 111 of file IOStream_T.h.

Constructor & Destructor Documentation

template<class STREAM>
ACE_IOStream< STREAM >::ACE_IOStream (  STREAM &  stream,
u_int  streambuf_size = ACE_STREAMBUF_SIZE
) 
 

Definition at line 104 of file IOStream_T.cpp.

References ACE_NEW, and ACE_IOStream< STREAM >::streambuf_. 

00106   : iostream (0),
00107     STREAM (stream)
00108 {
00109   ACE_NEW (streambuf_,
00110            ACE_Streambuf_T<STREAM> ((STREAM *) this,
00111                                     streambuf_size));
00112   iostream::init (this->streambuf_);
00113 }

template<class STREAM>
ACE_IOStream< STREAM >::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.

Definition at line 116 of file IOStream_T.cpp.

References ACE_NEW. 

00117   : iostream (0)
00118 {
00119   ACE_NEW (this->streambuf_,
00120            ACE_Streambuf_T<STREAM> ((STREAM *) this,
00121                                     streambuf_size));
00122   iostream::init (this->streambuf_);
00123 }

template<class STREAM>
ACE_IOStream< STREAM >::~ACE_IOStream (  void   )  [virtual]
 

We have to get rid of the ourselves since we gave it to the base class;

Definition at line 129 of file IOStream_T.cpp.

References ACE_IOStream< STREAM >::streambuf_. 

00130 {
00131   delete this->streambuf_;
00132 }

Member Function Documentation

template<class STREAM>
int ACE_IOStream< STREAM >::close (  void   )  [virtual]
 

The only ambituity in the multiple inheritance is the function.

Definition at line 138 of file IOStream_T.cpp. 

00139 {
00140   return STREAM::close ();
00141 }

template<class STREAM>
ACE_BEGIN_VERSIONED_NAMESPACE_DECL ACE_INLINE int ACE_IOStream< STREAM >::eof (  void   )  const
 

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

Definition at line 12 of file IOStream_T.inl.

References ACE_IOStream< STREAM >::streambuf_. 

00013 {
00014   // Get the timeout value of the streambuf
00015   ACE_Time_Value *timeout = this->streambuf_->recv_timeout (0);
00016 
00017   // Reset the timeout value of the streambuf.
00018   (void) this->streambuf_->recv_timeout (timeout);
00019 
00020   char c;
00021   int rval = this->streambuf_->recv_n (&c,
00022                                        sizeof c,
00023                                        MSG_PEEK,
00024                                        timeout);
00025 
00026   // Timeout, not an eof
00027   if (this->streambuf_->timeout())
00028     return 0;
00029 
00030   // No timeout, got enough data:  not eof
00031   if (rval == sizeof(char))
00032     return 0;
00033 
00034   // No timeout, not enough data:  definately eof
00035   return 1;
00036 }

template<class STREAM>
virtual int ACE_IOStream< STREAM >::ipfx (  int  need = 0  )  [inline, virtual]
 

Definition at line 214 of file IOStream_T.h. 

00214 {  return iostream::ipfx (need); }

template<class STREAM>
virtual int ACE_IOStream< STREAM >::ipfx0 (  void   )  [inline, virtual]
 

Definition at line 211 of file IOStream_T.h. 

00211 { return iostream::ipfx (0); }

template<class STREAM>
virtual int ACE_IOStream< STREAM >::ipfx1 (  void   )  [inline, virtual]
 

Definition at line 212 of file IOStream_T.h. 

00212 { return iostream::ipfx (1); }

template<class STREAM>
virtual void ACE_IOStream< STREAM >::isfx (  void   )  [inline, virtual]
 

Definition at line 215 of file IOStream_T.h. 

00215 {  iostream::isfx (); }

template<class STREAM>
ACE_IOStream< STREAM > & 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.

Definition at line 144 of file IOStream_T.cpp.

References ACE_IOStream< STREAM >::streambuf_. 

00145 {
00146   ACE_Time_Value *old_tv = this->streambuf_->recv_timeout (tv);
00147   tv = old_tv;
00148   return *this;
00149 }

template<class STREAM>
virtual int ACE_IOStream< STREAM >::opfx (  void   )  [inline, virtual]
 

Definition at line 216 of file IOStream_T.h. 

00216 {  return iostream::opfx (); }

template<class STREAM>
virtual void ACE_IOStream< STREAM >::osfx (  void   )  [inline, virtual]
 

Definition at line 217 of file IOStream_T.h. 

00217 {  iostream::osfx (); }

template<class STREAM>
ssize_t ACE_IOStream< STREAM >::recv (  ...   )  [private]
 

template<class STREAM>
ssize_t ACE_IOStream< STREAM >::recv_n (  ...   )  [private]
 

template<class STREAM>
ssize_t ACE_IOStream< STREAM >::send (  ...   )  [private]
 

template<class STREAM>
ssize_t ACE_IOStream< STREAM >::send_n (  ...   )  [private]
 

Member Data Documentation

template<class STREAM>
ACE_Streambuf_T<STREAM>* ACE_IOStream< STREAM >::streambuf_ [protected]
 

This is where all of the action takes place. The streambuf_ is the interface to the underlying STREAM.

Definition at line 227 of file IOStream_T.h.

Referenced by ACE_IOStream< STREAM >::ACE_IOStream(), ACE_IOStream< STREAM >::eof(), ACE_IOStream< STREAM >::operator>>(), and ACE_IOStream< STREAM >::~ACE_IOStream().

The documentation for this class was generated from the following files:
Generated on Thu Nov 9 11:23:36 2006 for ACE by doxygen 1.3.6