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/* -*- C++ -*- */
//=============================================================================
/**
* @file Asynch_Connector.h
*
* $Id$
*
* @author Alexander Libman <alibman@ihug.com.au>
*/
//=============================================================================
#ifndef ACE_ASYNCH_CONNECTOR_H
#define ACE_ASYNCH_CONNECTOR_H
#include /**/ "ace/pre.h"
#include "ace/config-all.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"
#include "ace/INET_Addr.h"
// Forward declarations
class ACE_Message_Block;
/**
* @class ACE_Asynch_Connector
*
* @brief This class is an example of the Connector pattern. This class
* will establish new connections and create new HANDLER objects to handle
* the new connections.
*
* Unlike the ACE_Connector, however, this class is designed to
* be used asynchronously with the ACE Proactor framework.
*/
template <class HANDLER>
class ACE_Asynch_Connector : public ACE_Handler
{
public:
static const ACE_INET_Addr local_default;
/// A do nothing constructor.
ACE_Asynch_Connector (void);
/// Virtual destruction
virtual ~ACE_Asynch_Connector (void);
/**
* This opens asynch connector
*/
virtual int open (int pass_addresses = 0,
ACE_Proactor *proactor = 0,
int validate_new_connection = 1);
/// This initiates a new asynchronous connect
virtual int connect (const ACE_INET_Addr &remote_sap,
const ACE_INET_Addr &local_sap = local_default,
int reuse_addr = 1,
const void *act = 0);
/**
* This cancels all pending accepts operations that were issued by
* the calling thread.
*
* @note On Windows, this method does not cancel connect operations
* issued by other threads.
*
* @note On POSIX, delegates cancelation to ACE_POSIX_Asynch_Connect.
*/
virtual int cancel (void);
/**
* Template method to validate peer before service is opened.
* This method is called when the connection attempt completes,
* whether it succeeded or failed, if the @a validate_connection
* argument to @c open() was non-zero or the @c validate_new_connection()
* method is called to turn this feature on. The default implementation
* returns 0. Users can (and probably should) reimplement this method
* to learn about the success or failure of the connection attempt.
* If the connection completed successfully, this method can be used to
* perform validation of the peer using it's address, running an
* authentication procedure (such as SSL) or anything else necessary or
* desireable. The return value from this method determines whether or
* not ACE will continue opening the service or abort the connection.
*
* @param result Result of the connection acceptance. Use
* result.success() to determine success or failure of
* the connection attempt.
* @param remote Peer's address. If the connection failed, this object
* is undefined.
* @param local Local address connection was completed from. If the
* connection failed, this object is undefined.
*
* @retval -1 ACE_Asynch_Connector will close the connection, and
* the service will not be opened.
* @retval 0 Service opening will proceeed.
* @return Return value is ignored if the connection attempt failed.
*/
virtual int validate_connection (const ACE_Asynch_Connect::Result& result,
const ACE_INET_Addr &remote,
const ACE_INET_Addr& local);
//
// These are low level tweaking methods
//
/// Set and get flag that indicates if parsing and passing of
/// addresses to the service_handler is necessary.
virtual int pass_addresses (void) const;
virtual void pass_addresses (int new_value);
/// Set and get flag that indicates if address validation is
/// required.
virtual int validate_new_connection (void) const;
virtual void validate_new_connection (int new_value);
protected:
/// This is called when an outstanding accept completes.
virtual void handle_connect (const ACE_Asynch_Connect::Result &result);
/// This parses the address from read buffer.
void parse_address (const ACE_Asynch_Connect::Result &result,
ACE_INET_Addr &remote_address,
ACE_INET_Addr &local_address);
/// Return the asynch Connect object.
ACE_Asynch_Connect & asynch_connect (void);
/**
* This is the template method used to create new handler.
* Subclasses must overwrite this method if a new handler creation
* strategy is required.
*/
virtual HANDLER *make_handler (void);
private:
/// Asynch_Connect used to make life easier :-)
ACE_Asynch_Connect asynch_connect_;
/// Flag that indicates if parsing of addresses is necessary.
int pass_addresses_;
/// Flag that indicates if address validation is required.
int validate_new_connection_;
};
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Asynch_Connector.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Asynch_Connector.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* ACE_WIN32 || ACE_HAS_AIO_CALLS */
#include /**/ "ace/post.h"
#endif /* ACE_ASYNCH_CONNECTOR_H */
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