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// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Asynch_Acceptor.h
//
// = AUTHOR
// Irfan Pyarali (irfan@cs.wustl.edu)
//
// ============================================================================
#ifndef ACE_ASYNCH_ACCEPTOR_H
#define ACE_ASYNCH_ACCEPTOR_H
#include "ace/pre.h"
#include "ace/OS.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#if defined (ACE_WIN32) || defined (ACE_HAS_AIO_CALLS)
// This only works on platforms that support async i/o.
#include "ace/Asynch_IO.h"
// Forward declarations
class ACE_Message_Block;
class ACE_INET_Addr;
template <class HANDLER>
class ACE_Asynch_Acceptor : public ACE_Handler
{
// = TITLE
// This class is an example of the Acceptor Pattern. This class
// will accept new connections and create new HANDLER to handle
// the new connections.
//
// = DESCRIPTION
// Unlike the <ACE_Acceptor>, however, this class is designed to
// be used asynchronously.
public:
ACE_Asynch_Acceptor (void);
// A do nothing constructor.
virtual ~ACE_Asynch_Acceptor (void);
// Virtual destruction
virtual int open (const ACE_INET_Addr &address,
size_t bytes_to_read = 0,
int pass_addresses = 0,
int backlog = ACE_DEFAULT_BACKLOG,
int reuse_addr = 1,
ACE_Proactor *proactor = 0,
int validate_new_connection = 0,
int reissue_accept = 1,
int number_of_initial_accepts = -1);
// This starts the listening process at the port specified by
// <address>. ACE_Asynch_Acceptor initiates the AcceptEx calls with
// <bytes_to_read>. The buffer for the initial data will be created
// by ACE_Asynch_Acceptor. This buffer will be passed to the
// handler in the <ACE_Service_Handler::open> callback. If this
// buffer is required past the <open> callback, the
// ACE_Service_Handler must copy the data. If the <pass_addresses>
// flag is set, ACE_Asynch_Acceptor will call
// <ACE_Service_Handler::addresses> before calling
// <ACE_Service_Handler::open>. The <backlog> parameter specifies
// the listen backlog and the outstanding AcceptEx calls.
// <number_of_initial_accepts> is the number of asynchronous accepts
// that are started at the end of <open>. If
// <number_of_initial_accepts> is -1, then
// <number_of_initial_accepts> is set to <backlog> and hence
// <backlog> number of asynchronous accepts are started.
virtual ACE_HANDLE get_handle (void) const;
// Get the underlying handle.
virtual void set_handle (ACE_HANDLE handle);
// Set the underlying listen handle. It is the user's responsibility
// to make sure that the old listen handle has been appropriately
// closed and the all outstanding asynchronous operations have
// either completed or have been canceled on the old listen handle.
virtual int accept (size_t bytes_to_read = 0, const void *act = 0);
// This initiates a new asynchronous accept through the <AcceptEx>
// call.
virtual int cancel (void);
// This cancels all pending accepts operations that were issued by
// the calling thread. The function does not cancel accept
// operations issued by other threads.
virtual int validate_new_connection (const ACE_INET_Addr &remote_address);
// Template method for address validation.
//
// Default implemenation always validates the remote address.
virtual int should_reissue_accept (void);
// Template method for deciding whether to reissue accept.
//
// Default implemenation always returns this->reissue_accept_.
//
// These are low level tweaking methods
//
virtual int pass_addresses (void) const;
virtual void pass_addresses (int new_value);
// Set and get flag that indicates if parsing and passing of
// addresses to the service_handler is necessary.
virtual int validate_new_connection (void) const;
virtual void validate_new_connection (int new_value);
// Set and get flag that indicates if address validation is
// required.
virtual int reissue_accept (void) const;
virtual void reissue_accept (int new_value);
// Set and get flag that indicates if a new accept should be
// reissued when a accept completes.
virtual int bytes_to_read (void) const;
virtual void bytes_to_read (int new_value);
// Set and get bytes to be read with the <accept> call.
static size_t address_size (void);
// This is required by the AcceptEx call.
protected:
virtual void handle_accept (const ACE_Asynch_Accept::Result &result);
// This is called when an outstanding accept completes.
ACE_HANDLE handle (void) const;
// Return the listen handle.
void parse_address (const ACE_Asynch_Accept::Result &result,
ACE_INET_Addr &remote_address,
ACE_INET_Addr &local_address);
// This parses the address from read buffer.
virtual HANDLER *make_handler (void);
// This is the template method used to create new handler.
// Subclasses must overwrite this method if a new handler creation
// strategy is required.
private:
ACE_HANDLE listen_handle_;
// Handle used to listen for new connections.
ACE_Asynch_Accept asynch_accept_;
// <Asynch_Accept> used to make life easier :-)
int pass_addresses_;
// Flag that indicates if parsing of addresses is necessary.
int validate_new_connection_;
// Flag that indicates if address validation is required.
int reissue_accept_;
// Flag that indicates if a new accept should be reissued when a
// accept completes.
int bytes_to_read_;
// Bytes to be read with the <accept> call.
};
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Asynch_Acceptor.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Asynch_Acceptor.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* ACE_WIN32 || ACE_HAS_AIO_CALLS */
#include "ace/post.h"
#endif /* ACE_ASYNCH_ACCEPTOR_H */
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