functie-queue
Code (php)
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<?php
// Load the queueCallback scheme from the repository.
require_once 'repository/queueCallback.php';
class queueFarm
{
private static $queueFarm = null;
private $queueIndex = array();
private $queueCount = 0;
private $waitTime = 0.0;
private function __construct()
{
}
public function __destruct()
{
$this -> queueIndex = array();
$this -> queueCount = 0;
}
private function __clone()
{
}
public static function getInstance()
{
if( self :: $queueFarm == null )
{
self :: $queueFarm = new self();
}
return self :: $queueFarm;
}
public function queueCount()
{
return $this -> queueCount;
}
public function waitTime()
{
return $this -> waitTime;
}
public function attachCallback( queueCallback $queueCallback )
{
// Put it in our index.
$this -> queueIndex [] = $queueCallback;
// Increase the queue count.
$this -> queueCount ++;
}
public function detachCallback( $callbackClass )
{
// We have queue classes in our index?
if( $this -> queueCount < 1 )
{
return true;
}
// Fetch the class's name (if we have to) ..
if( !is_string( $callbackClass ) && !get_class( $callbackClass ) )
{
throw new InvalidArgumentException( 'Callback class should be either a class or a string.' );
}
if( !is_string( $callbackClass ) )
{
$callbackClass = get_class( $callbackClass );
}
foreach( $this -> queueIndex as $queueId => $queueCallback )
{
// Fetch the parameters ..
$paramList = $queueCallback -> getParams();
// This is a class :: method() call?
if( !isset( $paramList [ 'callback' ][ 1 ] ) )
{
continue;
}
// Is this a match?
if( $paramList [ 'callback' ][ 0 ] == $callbackClass )
{
// Remove it from our list.
unset( $this -> queueIndex [ $queueId ] );
// Change the queue count.
$this -> queueCount --;
}
}
return true;
}
public function runCallbacks()
{
// We have things to run?
if( $this -> queueCount < 1 )
{
return true;
}
// Current micro-time.
$microTime = microtime( true );
// Lowest known runtime.
$lowestTime = 100.0;
// Loop trought our element tree.
foreach( $this -> queueIndex as $queueId => $queueCallback )
{
// Fetch callback's parameters ..
$paramList = $queueCallback -> getParams();
// Calculate the time left 'till execution ..
$timeLeft = $paramList [ 'time' ] - $microTime;
// Is that number negative?
if( $timeLeft < 1 )
{
// Run the bitch ..
self :: stackCall( $paramList );
// Remove the item from our list ..
unset( $this -> queueIndex [ $queueId ] );
// Change the queue count.
$this -> queueCount --;
// Go to the next iteration.
continue;
}
// We don't have to call it, but, is this timeLeft lower than the current known?
if( $timeLeft < $lowestTime )
{
$lowestTime = $timeLeft;
}
}
// Set the new wait time ..
$this -> waitTime = $lowestTime;
// Finished.
}
private static function stackCall( $paramList )
{
// Function call?
if( !isset( $paramList [ 'callback' ][ 1 ] ) )
{
call_user_func_array( $paramList [ 'callback' ][ 0 ], $paramList [ 'params' ] );
} else
{
call_user_func_array( $paramList [ 'callback' ], $paramList [ 'params' ] );
}
}
}
[/code]
[code]
[code]<?php
class queueCallback
{
protected $paramList = array(
'callback' => null,
'params' => array(),
'time' => 0.0
);
protected function __construct( $callback )
{
$this -> paramList [ 'callback' ] = $callback;
}
public function getParams()
{
return $this -> paramList;
}
public static function method()
{
$paramCount = func_num_args();
$paramList = func_get_args();
switch( $paramCount )
{
case 1:
if( !is_callable( $paramList [ 0 ] ) )
{
throw new BadMethodCallException( 'Specified function is not callable.' );
}
break;
case 2:
if( !is_callable( array( $paramList [ 0 ], $paramList [ 1 ] ) ) )
{
throw new BadMethodCallException( 'Please give a valid callback combination.' );
}
break;
default:
throw new UnexpectedValueException( 'Too many parameters given.' );
break;
}
return new self( $paramList );
}
public function params()
{
$paramList = func_get_args();
$this -> paramList [ 'params' ] = array_merge( $this -> paramList [ 'params' ], $paramList );
return $this;
}
public function time( $microTime )
{
if( !is_float( $microTime ) )
{
throw new InvalidArgumentException( '1st parameter should be a float.' );
}
if( $microTime < 0.01 )
{
throw new InvalidArgumentException( '1st parameter should be > 0.01' );
}
$this -> paramList [ 'time' ] = microtime( true ) + $microTime;
return $this;
}
}
[/code]
En een voorbeeldscript:
[code]
[code]<?php
// Load the farm object.
require_once 'queueFarm.php';
$queueFarm = queueFarm :: getInstance();
// Create some tasks ..
$queueCallback1 = queueCallback :: method( 'strtolower' ) -> params( 'UPPERCASE' ) -> time( 1.0 );
$queueCallback2 = queueCallback :: method( 'strtoupper' ) -> params( 'lowercase' ) -> time( 2.0 );
$queueCallback3 = queueCallback :: method( 'substr' ) -> params( 'phphulp', 0, 3 ) -> time( 3.0 );
// Put them in our farm.
$queueFarm -> attachCallback( $queueCallback1 );
$queueFarm -> attachCallback( $queueCallback2 );
$queueFarm -> attachCallback( $queueCallback3 );
// Sleep 2 seconds ..
sleep( 2 );
// Process functions.
$queueFarm -> runCallbacks();
// Time 'till next function.
echo $queueFarm -> waitTime(); // weergeeft '1'
[/code]
// Load the queueCallback scheme from the repository.
require_once 'repository/queueCallback.php';
class queueFarm
{
private static $queueFarm = null;
private $queueIndex = array();
private $queueCount = 0;
private $waitTime = 0.0;
private function __construct()
{
}
public function __destruct()
{
$this -> queueIndex = array();
$this -> queueCount = 0;
}
private function __clone()
{
}
public static function getInstance()
{
if( self :: $queueFarm == null )
{
self :: $queueFarm = new self();
}
return self :: $queueFarm;
}
public function queueCount()
{
return $this -> queueCount;
}
public function waitTime()
{
return $this -> waitTime;
}
public function attachCallback( queueCallback $queueCallback )
{
// Put it in our index.
$this -> queueIndex [] = $queueCallback;
// Increase the queue count.
$this -> queueCount ++;
}
public function detachCallback( $callbackClass )
{
// We have queue classes in our index?
if( $this -> queueCount < 1 )
{
return true;
}
// Fetch the class's name (if we have to) ..
if( !is_string( $callbackClass ) && !get_class( $callbackClass ) )
{
throw new InvalidArgumentException( 'Callback class should be either a class or a string.' );
}
if( !is_string( $callbackClass ) )
{
$callbackClass = get_class( $callbackClass );
}
foreach( $this -> queueIndex as $queueId => $queueCallback )
{
// Fetch the parameters ..
$paramList = $queueCallback -> getParams();
// This is a class :: method() call?
if( !isset( $paramList [ 'callback' ][ 1 ] ) )
{
continue;
}
// Is this a match?
if( $paramList [ 'callback' ][ 0 ] == $callbackClass )
{
// Remove it from our list.
unset( $this -> queueIndex [ $queueId ] );
// Change the queue count.
$this -> queueCount --;
}
}
return true;
}
public function runCallbacks()
{
// We have things to run?
if( $this -> queueCount < 1 )
{
return true;
}
// Current micro-time.
$microTime = microtime( true );
// Lowest known runtime.
$lowestTime = 100.0;
// Loop trought our element tree.
foreach( $this -> queueIndex as $queueId => $queueCallback )
{
// Fetch callback's parameters ..
$paramList = $queueCallback -> getParams();
// Calculate the time left 'till execution ..
$timeLeft = $paramList [ 'time' ] - $microTime;
// Is that number negative?
if( $timeLeft < 1 )
{
// Run the bitch ..
self :: stackCall( $paramList );
// Remove the item from our list ..
unset( $this -> queueIndex [ $queueId ] );
// Change the queue count.
$this -> queueCount --;
// Go to the next iteration.
continue;
}
// We don't have to call it, but, is this timeLeft lower than the current known?
if( $timeLeft < $lowestTime )
{
$lowestTime = $timeLeft;
}
}
// Set the new wait time ..
$this -> waitTime = $lowestTime;
// Finished.
}
private static function stackCall( $paramList )
{
// Function call?
if( !isset( $paramList [ 'callback' ][ 1 ] ) )
{
call_user_func_array( $paramList [ 'callback' ][ 0 ], $paramList [ 'params' ] );
} else
{
call_user_func_array( $paramList [ 'callback' ], $paramList [ 'params' ] );
}
}
}
[/code]
[code]
[code]<?php
class queueCallback
{
protected $paramList = array(
'callback' => null,
'params' => array(),
'time' => 0.0
);
protected function __construct( $callback )
{
$this -> paramList [ 'callback' ] = $callback;
}
public function getParams()
{
return $this -> paramList;
}
public static function method()
{
$paramCount = func_num_args();
$paramList = func_get_args();
switch( $paramCount )
{
case 1:
if( !is_callable( $paramList [ 0 ] ) )
{
throw new BadMethodCallException( 'Specified function is not callable.' );
}
break;
case 2:
if( !is_callable( array( $paramList [ 0 ], $paramList [ 1 ] ) ) )
{
throw new BadMethodCallException( 'Please give a valid callback combination.' );
}
break;
default:
throw new UnexpectedValueException( 'Too many parameters given.' );
break;
}
return new self( $paramList );
}
public function params()
{
$paramList = func_get_args();
$this -> paramList [ 'params' ] = array_merge( $this -> paramList [ 'params' ], $paramList );
return $this;
}
public function time( $microTime )
{
if( !is_float( $microTime ) )
{
throw new InvalidArgumentException( '1st parameter should be a float.' );
}
if( $microTime < 0.01 )
{
throw new InvalidArgumentException( '1st parameter should be > 0.01' );
}
$this -> paramList [ 'time' ] = microtime( true ) + $microTime;
return $this;
}
}
[/code]
En een voorbeeldscript:
[code]
[code]<?php
// Load the farm object.
require_once 'queueFarm.php';
$queueFarm = queueFarm :: getInstance();
// Create some tasks ..
$queueCallback1 = queueCallback :: method( 'strtolower' ) -> params( 'UPPERCASE' ) -> time( 1.0 );
$queueCallback2 = queueCallback :: method( 'strtoupper' ) -> params( 'lowercase' ) -> time( 2.0 );
$queueCallback3 = queueCallback :: method( 'substr' ) -> params( 'phphulp', 0, 3 ) -> time( 3.0 );
// Put them in our farm.
$queueFarm -> attachCallback( $queueCallback1 );
$queueFarm -> attachCallback( $queueCallback2 );
$queueFarm -> attachCallback( $queueCallback3 );
// Sleep 2 seconds ..
sleep( 2 );
// Process functions.
$queueFarm -> runCallbacks();
// Time 'till next function.
echo $queueFarm -> waitTime(); // weergeeft '1'
[/code]