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@ezimuel
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<?php
/**
* Facade design pattern (example of implementation)
*
* @author Enrico Zimuel (enrico@zimuel.it)
* @see http://en.wikipedia.org/wiki/Facade_pattern
*/
class CPU {
public function freeze() {
echo "Freeze the CPU\n";
}
public function jump($address) {
echo "Jump to $address\n";
}
public function execute() {
echo "Execute\n";
}
}
class Memory {
public function load($address, $data) {
echo "Loading address $address with data: $data\n";
}
}
class Disk {
public function read($sector, $size) {
return "data from sector $sector ($size)";
}
}
// Facade
class Computer {
const BOOT_ADDRESS = 0;
const BOOT_SECTOR = 1;
const SECTOR_SIZE = 16;
protected $cpu;
protected $mem;
protected $hd;
public function __construct(CPU $cpu, Memory $mem, Disk $hd) {
$this->cpu = $cpu;
$this->mem = $mem;
$this->hd = $hd;
}
public function startComputer() {
$this->cpu->freeze();
$this->mem->load(self::BOOT_ADDRESS,
$this->hd->read(self::BOOT_SECTOR, self::SECTOR_SIZE));
$this->cpu->jump(self::BOOT_ADDRESS);
$this->cpu->execute();
}
}
// Usage example
$pc = new Computer(new CPU, new Memory, new Disk);
$pc->startComputer();
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