The Volatile class

Einführung

The Volatile class is new to pthreads v3. Its introduction is a consequence of the new immutability semantics of Threaded members of Threaded classes. The Volatile class enables for mutability of its Threaded members, and is also used to store PHP arrays in Threaded contexts.

Klassenbeschreibung

Volatile extends Threaded implements Collectable , Traversable {

/* Geerbte Methoden */

public array Threaded::chunk ( int $size , bool $preserve )

public int Threaded::count ( void )

public bool Threaded::extend ( string $class )

public Threaded Threaded::from ( Closure $run [, Closure $construct [, array $args ]] )

public array Threaded::getTerminationInfo ( void )

public bool Threaded::isRunning ( void )

public bool Threaded::isTerminated ( void )

public bool Threaded::isWaiting ( void )

public bool Threaded::lock ( void )

public bool Threaded::merge ( mixed $from [, bool $overwrite ] )

public bool Threaded::notify ( void )

public bool Threaded::notifyOne ( void )

public bool Threaded::pop ( void )

public void Threaded::run ( void )

public mixed Threaded::shift ( void )

public mixed Threaded::synchronized ( Closure $block [, mixed $... ] )

public bool Threaded::unlock ( void )

public bool Threaded::wait ([ int $timeout ] )

}

Beispiele

Beispiel #1 New immutability semantics of Threaded


<?php

class Task extends Threaded
{
    public function __construct()
    {
        $this->data = new Threaded();

        // attempt to overwrite a Threaded property of a Threaded class (invalid)
        $this->data = new StdClass();
    }
}

var_dump((new Task())->data);

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

RuntimeException: Threaded members previously set to Threaded objects are immutable, cannot overwrite data in %s:%d

Beispiel #2 Volatile use-case


<?php

class Task extends Volatile
{
    public function __construct()
    {
        $this->data = new Threaded();

        // attempt to overwrite a Threaded property of a Volatile class (valid)
        $this->data = new StdClass();
    }
}

var_dump((new Task())->data);

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

object(stdClass)#3 (0) {
}