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# ACE_Asynch_Acceptor< HANDLER > Class Template Reference

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 Methods

| 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)
virtual ACE_HANDLE | get_handle (void) const
| Get the underlying handle.
virtual void | 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 | validate_new_connection (const ACE_INET_Addr &remote_address)
virtual int | should_reissue_accept (void)
virtual int | pass_addresses (void) const
virtual void | pass_addresses (int new_value)
virtual int | validate_new_connection (void) const
| Get flag that indicates if address validation is required.
virtual void | validate_new_connection (int 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.

## Static Public Methods

size_t | address_size (void)
| This is required by the AcceptEx call.

## Protected Methods

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 :-)
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_
size_t | bytes_to_read_
| Bytes to be read with the <accept> call.

## 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>
size_t ACE_Asynch_Acceptor< HANDLER >::address_size | ( | void |  | ) | `[static]`

| This is required by the AcceptEx call.

template<class HANDLER>
ACE_Asynch_Accept & ACE_Asynch_Acceptor< HANDLER >::asynch_accept | ( | void |  | ) | `[protected]`

| Return the asynch accept object.

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

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

| Set the listen handle. Reimplemented from ACE_Handler.

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_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,
|  | 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
| ) | `[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_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 non-zero, 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>
void ACE_Asynch_Acceptor< HANDLER >::pass_addresses | ( | int | 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 >::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 >::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 >::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 >::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:

  result | Result of the connection acceptance.
  remote | Peer's address.
  local | Local address connection was accepted at.

Return values:

  -1 | ACE_Asynch_Acceptor will close the connection, and the service will not be opened.
  0 | Service opening will proceeed.

template<class HANDLER>
void ACE_Asynch_Acceptor< HANDLER >::validate_new_connection | ( | int | new_value | ) | `[virtual]`

| Set flag that indicates if address validation is required.

template<class HANDLER>
int ACE_Asynch_Acceptor< HANDLER >::validate_new_connection | ( | void |  | ) | const`[virtual]`

| Get flag that indicates if address validation is required.

template<class HANDLER>
int ACE_Asynch_Acceptor< HANDLER >::validate_new_connection | ( | const ACE_INET_Addr & | remote_address | ) | `[virtual]`

Deprecated:
  Use validate_connection() instead. Will be removed after ACE 5.3.

Template method for address validation.

This hook method is called after a connection is accepted if so specified on the call to the `open()` method. If this method returns -1, the connection is immediately closed and the service handler is not opened.

The default implemenation always return 0.

## Member Data Documentation

template<class HANDLER>
ACE_Asynch_Accept ACE_Asynch_Acceptor< HANDLER >::asynch_accept_`[private]`

| <Asynch_Accept> used to make life easier :-)

template<class HANDLER>
size_t ACE_Asynch_Acceptor< HANDLER >::bytes_to_read_`[private]`

| Bytes to be read with the <accept> call.

template<class HANDLER>
ACE_HANDLE ACE_Asynch_Acceptor< HANDLER >::listen_handle_`[private]`

| Handle used to listen for new connections.

template<class HANDLER>
int ACE_Asynch_Acceptor< HANDLER >::pass_addresses_`[private]`

| Flag that indicates if parsing of addresses is necessary.

template<class HANDLER>
int ACE_Asynch_Acceptor< HANDLER >::reissue_accept_`[private]`

| Flag that indicates if a new accept should be reissued when a accept completes.

template<class HANDLER>
int ACE_Asynch_Acceptor< HANDLER >::validate_new_connection_`[private]`

| Flag that indicates if address validation is required.

The documentation for this class was generated from the following files:

- /export2/deucetmp/bala/release_try/ACE_wrappers/ace/Asynch_Acceptor.h
- /export2/deucetmp/bala/release_try/ACE_wrappers/ace/Asynch_Acceptor.cpp