Poller.php
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Code (php)
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<?php
/**
* Streams library
* Copyright (c) 2012, Remco Pander
*
* This library consists of a set of classes that can be used to create high-performing
* applications using full-duplex connections. It uses the built-in stream functions
* provided with php.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @package Streams
* @author Remco Pander <[email protected]>
* @version v1 initial release
* @copyright Copyright (c) 2012, Remco Pander
*/
namespace Streams;
use \InvalidArgumentException;
use \RuntimeException;
final class Poller
{
// Instance of the poller
private static $_instance = null;
// List of all connections to monitor
private $a_connList = array ();
private $a_connSocks = array ();
// Returns instance of this class
public static function getInstance ()
{
if (empty (self :: $_instance))
{
self :: $_instance = new Poller ();
}
return self :: $_instance;
}
// Allow no creation of this class
private function __construct ()
{
}
public function hasConnection (Connection $o_Conn)
{
return in_array ($o_Conn, $this -> a_connList);
}
public function getCount ()
{
return count ($this -> a_connList);
}
public function addConnection ($r_Socket, $o_Conn)
{
if (!$o_Conn instanceof Connection && !$o_Conn instanceof Listening)
{
throw new InvalidArgumentException ('Poller :: addConnection () expects parameter 2 to be an instance of Connection or Listening.');
} else if (!is_resource ($r_Socket))
{
throw new InvalidArgumentException ('Poller :: addConnection () expects parameter 1 to be a valid resource.');
} else if (in_array ($o_Conn, $this -> a_connList))
{
return true;
}
$i_Intval = intval ($r_Socket);
$this -> a_connList [$i_Intval] = $o_Conn;
$this -> a_connSocks [$i_Intval] = $r_Socket;
return true;
}
public function removeConnection ($o_Conn)
{
if (!$o_Conn instanceof Connection && !$o_Conn instanceof Listening)
{
throw new InvalidArgumentException ('Poller :: addConnection () expects parameter 2 to be an instance of Connection or Listening.');
}
if (!in_array ($o_Conn, $this -> a_connList))
{
return true;
}
$i_Intval = array_search ($o_Conn, $this -> a_connList, true);
unset ($this -> a_connList [$i_Intval]);
unset ($this -> a_connSocks [$i_Intval]);
return true;
}
public function pollConnections ($f_blockTime = 0)
{
if ($this -> getCount () < 1)
{
return false;
}
// Calculate time-out
if (!is_float ($f_blockTime) && !is_int ($f_blockTime))
{
$i_Seconds = null;
$i_mSeconds = null;
} else
{
$i_Seconds = floor ($f_blockTime);
$i_mSeconds = (($f_blockTime - $i_Seconds) * 1e6);
}
// Create fd sets
$a_readSock = $a_writeSocks = $a_exceptSocks = array ();
foreach ($this -> a_connList as $i_Intval => $o_Connection)
{
$r_Socket = $this -> a_connSocks [$i_Intval];
switch ($o_Connection -> getStatus ())
{
case Status :: CONNECTING:
$a_writeSocks [] = $r_Socket;
break;
case Status :: CONNECTED:
$a_readSocks [] = $r_Socket;
$a_exceptSocks [] = $r_Socket;
if ($o_Connection -> hasWriteBuffer ())
{
$a_writeSocks [] = $r_Socket;
}
break;
case Status :: LISTENING:
$a_readSocks [] = $r_Socket;
break;
}
}
// Here comes the magic part
if (($i_Changed = stream_select ($a_readSocks, $a_writeSocks, $a_exceptSocks, $i_Seconds, $i_mSeconds)) === false)
{
throw new RuntimeException ('Fatal error occurred while performing stream_select ().');
} else if ($i_Changed < 1)
{
return false;
}
/**
* Readable sockets are sockets that:
* 1. listening for connections with an incoming connection
* 2. data is avaliable to be read
* 3. end-of-file has been reached
*/
if (count ($a_readSocks) > 0)
{
foreach ($a_readSocks as $r_Socket)
{
$o_Connection = $this -> a_connList [intval ($r_Socket)];
switch ($o_Connection -> getStatus ())
{
case Status :: LISTENING:
$o_Connection -> accept ();
break;
case Status :: CONNECTED:
$o_Connection -> read ();
break;
}
}
}
/**
* Writable sockets are sockets that:
* 1. sockets that were connecting and now are connected
* 2. data can be written
*/
if (count ($a_writeSocks) > 0)
{
foreach ($a_writeSocks as $r_Socket)
{
$o_Connection = $this -> a_connList [intval ($r_Socket)];
switch ($o_Connection -> getStatus ())
{
case Status :: CONNECTING:
$o_Connection -> connect ();
break;
case Status :: CONNECTED:
$o_Connection -> write ();
break;
}
}
}
/**
* Except sockets are sockets that:
* 1. sockets that were connecting and it failed
* 2. Out-Of-Band data can be read
*/
if (count ($a_exceptSocks) > 0)
{
foreach ($a_exceptSocks as $r_Socket)
{
$o_Connection = $this -> a_connList [intval ($r_Socket)];
switch ($o_Connection -> getStatus ())
{
case Status :: CONNECTING:
$o_Connection -> connect ();
break;
case Status :: CONNECTED:
// @todo
break;
}
}
}
return true;
}
}
/**
* Streams library
* Copyright (c) 2012, Remco Pander
*
* This library consists of a set of classes that can be used to create high-performing
* applications using full-duplex connections. It uses the built-in stream functions
* provided with php.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @package Streams
* @author Remco Pander <[email protected]>
* @version v1 initial release
* @copyright Copyright (c) 2012, Remco Pander
*/
namespace Streams;
use \InvalidArgumentException;
use \RuntimeException;
final class Poller
{
// Instance of the poller
private static $_instance = null;
// List of all connections to monitor
private $a_connList = array ();
private $a_connSocks = array ();
// Returns instance of this class
public static function getInstance ()
{
if (empty (self :: $_instance))
{
self :: $_instance = new Poller ();
}
return self :: $_instance;
}
// Allow no creation of this class
private function __construct ()
{
}
public function hasConnection (Connection $o_Conn)
{
return in_array ($o_Conn, $this -> a_connList);
}
public function getCount ()
{
return count ($this -> a_connList);
}
public function addConnection ($r_Socket, $o_Conn)
{
if (!$o_Conn instanceof Connection && !$o_Conn instanceof Listening)
{
throw new InvalidArgumentException ('Poller :: addConnection () expects parameter 2 to be an instance of Connection or Listening.');
} else if (!is_resource ($r_Socket))
{
throw new InvalidArgumentException ('Poller :: addConnection () expects parameter 1 to be a valid resource.');
} else if (in_array ($o_Conn, $this -> a_connList))
{
return true;
}
$i_Intval = intval ($r_Socket);
$this -> a_connList [$i_Intval] = $o_Conn;
$this -> a_connSocks [$i_Intval] = $r_Socket;
return true;
}
public function removeConnection ($o_Conn)
{
if (!$o_Conn instanceof Connection && !$o_Conn instanceof Listening)
{
throw new InvalidArgumentException ('Poller :: addConnection () expects parameter 2 to be an instance of Connection or Listening.');
}
if (!in_array ($o_Conn, $this -> a_connList))
{
return true;
}
$i_Intval = array_search ($o_Conn, $this -> a_connList, true);
unset ($this -> a_connList [$i_Intval]);
unset ($this -> a_connSocks [$i_Intval]);
return true;
}
public function pollConnections ($f_blockTime = 0)
{
if ($this -> getCount () < 1)
{
return false;
}
// Calculate time-out
if (!is_float ($f_blockTime) && !is_int ($f_blockTime))
{
$i_Seconds = null;
$i_mSeconds = null;
} else
{
$i_Seconds = floor ($f_blockTime);
$i_mSeconds = (($f_blockTime - $i_Seconds) * 1e6);
}
// Create fd sets
$a_readSock = $a_writeSocks = $a_exceptSocks = array ();
foreach ($this -> a_connList as $i_Intval => $o_Connection)
{
$r_Socket = $this -> a_connSocks [$i_Intval];
switch ($o_Connection -> getStatus ())
{
case Status :: CONNECTING:
$a_writeSocks [] = $r_Socket;
break;
case Status :: CONNECTED:
$a_readSocks [] = $r_Socket;
$a_exceptSocks [] = $r_Socket;
if ($o_Connection -> hasWriteBuffer ())
{
$a_writeSocks [] = $r_Socket;
}
break;
case Status :: LISTENING:
$a_readSocks [] = $r_Socket;
break;
}
}
// Here comes the magic part
if (($i_Changed = stream_select ($a_readSocks, $a_writeSocks, $a_exceptSocks, $i_Seconds, $i_mSeconds)) === false)
{
throw new RuntimeException ('Fatal error occurred while performing stream_select ().');
} else if ($i_Changed < 1)
{
return false;
}
/**
* Readable sockets are sockets that:
* 1. listening for connections with an incoming connection
* 2. data is avaliable to be read
* 3. end-of-file has been reached
*/
if (count ($a_readSocks) > 0)
{
foreach ($a_readSocks as $r_Socket)
{
$o_Connection = $this -> a_connList [intval ($r_Socket)];
switch ($o_Connection -> getStatus ())
{
case Status :: LISTENING:
$o_Connection -> accept ();
break;
case Status :: CONNECTED:
$o_Connection -> read ();
break;
}
}
}
/**
* Writable sockets are sockets that:
* 1. sockets that were connecting and now are connected
* 2. data can be written
*/
if (count ($a_writeSocks) > 0)
{
foreach ($a_writeSocks as $r_Socket)
{
$o_Connection = $this -> a_connList [intval ($r_Socket)];
switch ($o_Connection -> getStatus ())
{
case Status :: CONNECTING:
$o_Connection -> connect ();
break;
case Status :: CONNECTED:
$o_Connection -> write ();
break;
}
}
}
/**
* Except sockets are sockets that:
* 1. sockets that were connecting and it failed
* 2. Out-Of-Band data can be read
*/
if (count ($a_exceptSocks) > 0)
{
foreach ($a_exceptSocks as $r_Socket)
{
$o_Connection = $this -> a_connList [intval ($r_Socket)];
switch ($o_Connection -> getStatus ())
{
case Status :: CONNECTING:
$o_Connection -> connect ();
break;
case Status :: CONNECTED:
// @todo
break;
}
}
}
return true;
}
}