This class is an example of the Acceptor Pattern. This class will accept new connections and create new HANDLER to handle the new connections. More...

#include <Asynch_Acceptor.h>

Inheritance diagram for ACE_Asynch_Acceptor< HANDLER >:

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Collaboration diagram for ACE_Asynch_Acceptor< HANDLER >:

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List of all members.

Public Member Functions
	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, bool pass_addresses=false, int backlog=ACE_DEFAULT_ASYNCH_BACKLOG, int reuse_addr=1, ACE_Proactor *proactor=0, bool validate_new_connection=false, int reissue_accept=1, int number_of_initial_accepts=-1)
virtual ACE_HANDLE	get_handle (void) const
	Get the underlying handle.
virtual int	set_handle (ACE_HANDLE handle)
virtual int	accept (size_t bytes_to_read=0, const void *act=0)
	This initiates a new asynchronous accept operation.
virtual int	cancel (void)
virtual int	validate_connection (const ACE_Asynch_Accept::Result &result, const ACE_INET_Addr &remote, const ACE_INET_Addr &local)
virtual int	should_reissue_accept (void)
virtual bool	pass_addresses (void) const
virtual void	pass_addresses (bool new_value)
virtual bool	validate_new_connection (void) const
	Get flag that indicates if address validation is required.
virtual void	validate_new_connection (bool new_value)
	Set flag that indicates if address validation is required.
virtual int	reissue_accept (void) const
virtual void	reissue_accept (int new_value)
virtual size_t	bytes_to_read (void) const
	Get bytes to be read with the <accept> call.
virtual void	bytes_to_read (size_t new_value)
	Set bytes to be read with the <accept> call.
Protected Member Functions
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	handle (ACE_HANDLE h)
	Set 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.
ACE_Asynch_Accept &	asynch_accept (void)
	Return the asynch accept object.
virtual HANDLER *	make_handler (void)
Private Attributes
ACE_HANDLE	listen_handle_
	Handle used to listen for new connections.
ACE_Asynch_Accept	asynch_accept_
	Asynch_Accept used to make life easier :-)
bool	pass_addresses_
	Flag that indicates if parsing of addresses is necessary.
bool	validate_new_connection_
	Flag that indicates if address validation is required.
int	reissue_accept_
size_t	bytes_to_read_
	Bytes to be read with the <accept> call.
int	addr_family_

Detailed Description

template<class HANDLER>
class ACE_Asynch_Acceptor< HANDLER >

This class is an example of the Acceptor Pattern. This class will accept new connections and create new HANDLER to handle the new connections.

Unlike the ACE_Acceptor, however, this class is designed to be used asynchronously.

Constructor & Destructor Documentation

template<class HANDLER >

ACE_Asynch_Acceptor< HANDLER >::ACE_Asynch_Acceptor ( void )

A do nothing constructor.

template<class HANDLER >

ACE_Asynch_Acceptor< HANDLER >::~ACE_Asynch_Acceptor ( void ) [virtual]

Virtual destruction.

Member Function Documentation

template<class HANDLER >

int ACE_Asynch_Acceptor< HANDLER >::accept	(	size_t	bytes_to_read = `0`,
		const void *	act = `0`
	)		`[virtual]`

This initiates a new asynchronous accept operation.

You need only call this method if the reissue_accept argument passed to open() was 0.

template<class HANDLER >

ACE_Asynch_Accept & ACE_Asynch_Acceptor< HANDLER >::asynch_accept ( void ) [protected]

Return the asynch accept object.

template<class HANDLER >

size_t ACE_Asynch_Acceptor< HANDLER >::bytes_to_read ( void ) const [virtual]

Get bytes to be read with the <accept> call.

template<class HANDLER >

void ACE_Asynch_Acceptor< HANDLER >::bytes_to_read ( size_t new_value ) [virtual]

Set bytes to be read with the <accept> call.

template<class HANDLER >

int ACE_Asynch_Acceptor< HANDLER >::cancel ( void ) [virtual]

Cancels all pending accepts operations issued by this object.

Note:: On Windows, only accept operations initiated by the calling thread are canceled.

template<class HANDLER >

ACE_HANDLE ACE_Asynch_Acceptor< HANDLER >::get_handle ( void ) const [virtual]

Get the underlying handle.

template<class HANDLER >

ACE_HANDLE ACE_Asynch_Acceptor< HANDLER >::handle ( void ) const [protected, virtual]

Return the listen handle.

Reimplemented from ACE_Handler.

template<class HANDLER >

void ACE_Asynch_Acceptor< HANDLER >::handle ( ACE_HANDLE h ) [protected, virtual]

Set the listen handle.

Reimplemented from ACE_Handler.

template<class HANDLER >

void ACE_Asynch_Acceptor< HANDLER >::handle_accept ( const ACE_Asynch_Accept::Result & result ) [protected, virtual]

This is called when an outstanding accept completes.

Reimplemented from ACE_Handler.

template<class HANDLER >

HANDLER * ACE_Asynch_Acceptor< HANDLER >::make_handler ( void ) [protected, virtual]

This is the template method used to create new handler. Subclasses must overwrite this method if a new handler creation strategy is required.

template<class HANDLER >

int ACE_Asynch_Acceptor< HANDLER >::open	(	const ACE_INET_Addr &	address,
		size_t	bytes_to_read = `0`,
		bool	pass_addresses = `false`,
		int	backlog = `ACE_DEFAULT_ASYNCH_BACKLOG`,
		int	reuse_addr = `1`,
		ACE_Proactor *	proactor = `0`,
		bool	validate_new_connection = `false`,
		int	reissue_accept = `1`,
		int	number_of_initial_accepts = `-1`
	)		`[virtual]`

open starts one or more asynchronous accept requests on a address. Each accept operation may optionally read an initial buffer from the new connection when accepted.

Parameters:

address	The address to listen/accept connections on. If the address does not specify a port, a random port is selected and bound.
bytes_to_read	Optional, specifies the maximum number of bytes to read with the accept. The buffer for the initial data is allocated internally and passed to the `ACE_Service_Handler::open()` hook method. It is legitimate only during the `open()` method and must be copied if required after `open()` returns. This pre-read function works only on Windows.
pass_addresses	Optional, a non-zero value indicates that the local and peer addresses should be passed to the associated `ACE_Service_Handler::addresses()` method after any call to `validate_new_connection()` and prior to the `open()` hook method call.
backlog	Optional, defaulting to `ACE_DEFAULT_ASYNCH_BACKLOG` (which can be adjusted in your platform's `config.h` file). Specifies the listening backlog for the listening socket.
reuse_addr	Optional, indicates whether the `SO_REUSEADDR` option is set on the listening socket or not.
proactor	Optional, pointer to the `ACE_Proactor` to use for demultiplexing asynchronous accepts. If 0, the process's singleton `ACE_Proactor` is used.
validate_new_connection	Optional, if true, this object's `validate_connection()` method is called after the accept completes, but before the service handler's `open()` hook method is called. If `validate_connection()` returns -1, the newly-accepted socket is immediately closed, and the `addresses()` method is not called.
reissue_accept	Optional, if non-zero (the default), a new asynchronous accept operation is started after each completion, whether the completion is for success or failure, and whether or not a successfully-accepted connection is subsequently refused.
number_of_initial_accepts	Optional, the number of asynchronous accepts that are started immediately. If -1 (the default), the value of backlog is used.

Note:: On Windows, the peer address is only available at the time the connection is accepted. Therefore, if you require the peer address on Windows, do not rely on the ACE_SOCK::get_remote_addr() method - it won't work. You must supply a non-zero value for pass_addresses and obtain the peer address in the ACE_Service_Handler::addresses() method.

See also:: ACE_INET_Addr; ACE_Service_Handler

template<class HANDLER >

void ACE_Asynch_Acceptor< HANDLER >::parse_address	(	const ACE_Asynch_Accept::Result &	result,
		ACE_INET_Addr &	remote_address,
		ACE_INET_Addr &	local_address
	)		`[protected]`

This parses the address from read buffer.

template<class HANDLER >

bool ACE_Asynch_Acceptor< HANDLER >::pass_addresses ( void ) const [virtual]

Get flag that indicates if parsing and passing of addresses to the service_handler is necessary.

template<class HANDLER >

void ACE_Asynch_Acceptor< HANDLER >::pass_addresses ( bool new_value ) [virtual]

Set flag that indicates if parsing and passing of addresses to the service_handler is necessary.

template<class HANDLER >

int ACE_Asynch_Acceptor< HANDLER >::reissue_accept ( void ) const [virtual]

Get flag that indicates if a new accept should be reissued when a accept completes.

template<class HANDLER >

void ACE_Asynch_Acceptor< HANDLER >::reissue_accept ( int new_value ) [virtual]

Set flag that indicates if a new accept should be reissued when a accept completes.

template<class HANDLER >

int ACE_Asynch_Acceptor< HANDLER >::set_handle ( ACE_HANDLE handle ) [virtual]

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.

template<class HANDLER >

int ACE_Asynch_Acceptor< HANDLER >::should_reissue_accept ( void ) [virtual]

Template method for deciding whether to reissue accept.

This hook method is called after each accept completes to decide if another accept should be initiated. If the method returns a non-zero value, another accept is initiated.

The default implemenation always returns the value passed as the open() method's reissue_accept argument. That value can also be changed using the reissue_accept() method.

template<class HANDLER >

int ACE_Asynch_Acceptor< HANDLER >::validate_connection	(	const ACE_Asynch_Accept::Result &	result,
		const ACE_INET_Addr &	remote,
		const ACE_INET_Addr &	local
	)		`[virtual]`

Template method to validate peer before service is opened. This method is called after a new connection is accepted if the validate_connection argument to open() was non-zero or the validate_new_connection() method is called to turn this feature on. The default implementation returns 0. Users can reimplement this method 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.

Parameters: