Movable.php

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<?php
#require_once 'Zend/Memory/Container.php';

#require_once 'Zend/Memory/Value.php';

class Zend_Memory_Container_Movable extends Zend_Memory_Container {
    protected $_id;

    private $_memManager;

    private $_value;

    const LOADED   = 1;
    const SWAPPED  = 2;
    const LOCKED   = 4;

    private $_state;

    public function __construct(Zend_Memory_Manager $memoryManager, $id, $value)
    {
        $this->_memManager = $memoryManager;
        $this->_id    = $id;
        $this->_state = self::LOADED;
        $this->_value = new Zend_Memory_Value($value, $this);
    }

    public function lock()
    {
        if ( !($this->_state & self::LOADED) ) {
            $this->_memManager->load($this, $this->_id);
            $this->_state |= self::LOADED;
        }

        $this->_state |= self::LOCKED;

    }

    public function unlock()
    {
        // Clear LOCKED state bit
        $this->_state &= ~self::LOCKED;
    }

    public function isLocked()
    {
        return $this->_state & self::LOCKED;
    }

    public function __get($property)
    {
        if ($property != 'value') {
            #require_once 'Zend/Memory/Exception.php';
            throw new Zend_Memory_Exception('Unknown property: Zend_Memory_container::$' . $property);
        }

        if ( !($this->_state & self::LOADED) ) {
            $this->_memManager->load($this, $this->_id);
            $this->_state |= self::LOADED;
        }

        return $this->_value;
    }

    public function __set($property, $value)
    {
        if ($property != 'value') {
            #require_once 'Zend/Memory/Exception.php';
            throw new Zend_Memory_Exception('Unknown property: Zend_Memory_container::$' . $property);
        }

        $this->_state = self::LOADED;
        $this->_value = new Zend_Memory_Value($value, $this);

        $this->_memManager->processUpdate($this, $this->_id);
    }


    public function &getRef()
    {
        if ( !($this->_state & self::LOADED) ) {
            $this->_memManager->load($this, $this->_id);
            $this->_state |= self::LOADED;
        }

        return $this->_value->getRef();
    }

    public function touch()
    {
        $this->_memManager->processUpdate($this, $this->_id);
    }

    public function processUpdate()
    {
        // Clear SWAPPED state bit
        $this->_state &= ~self::SWAPPED;

        $this->_memManager->processUpdate($this, $this->_id);
    }

    public function startTrace()
    {
        if ( !($this->_state & self::LOADED) ) {
            $this->_memManager->load($this, $this->_id);
            $this->_state |= self::LOADED;
        }

        $this->_value->startTrace();
    }

    public function setValue($value)
    {
        $this->_value = new Zend_Memory_Value($value, $this);
    }

    public function unloadValue()
    {
        // Clear LOADED state bit
        $this->_state &= ~self::LOADED;

        $this->_value = null;
    }

    public function markAsSwapped()
    {
        // Clear LOADED state bit
        $this->_state |= self::LOADED;
    }

    public function isSwapped()
    {
        return $this->_state & self::SWAPPED;
    }

    public function getId()
    {
        return $this->_id;
    }
    public function destroy()
    {
        $this->_memManager->unlink($this, $this->_id);
    }
}