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behavioral-mediator.php
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behavioral-mediator.php
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<?php
/**
* This example just to simulate how Mediator can be work
* 2nees.com
*/
const UP = "UP";
const DOWN = "DOWN";
const FIRE = "FIRE";
const SAFE = "SAFE";
/**
* Interface PilotsMediator - Mediator Interface
*/
interface PilotsMediator {
public function notify(BaseComponent $sender, string $event);
}
/**
* The Base Component provides the basic functionality of storing a mediator's
*/
abstract class BaseComponent
{
protected ?ControlTower $controlTower;
public function setControlTower(ControlTower $controlTower): void
{
$this->controlTower = $controlTower;
}
}
#region Components - Various classes that contain some business logic
class Helicopter extends BaseComponent {
public function helicopterUP()
{
$this->controlTower->notify($this, UP);
}
public function helicopterDOWN()
{
$this->controlTower->notify($this, DOWN);
}
// Do needed job base on actions or base on needed details for this class...
}
class Airbus extends BaseComponent {
public function airbusUP()
{
$this->controlTower->notify($this, UP);
}
public function airbusDOWN()
{
$this->controlTower->notify($this, DOWN);
}
// Do needed job base on actions or base on needed details for this class...
}
class Emergency extends BaseComponent {
private bool $isSafe = true;
public function fireAlarm(){
$this->isSafe = false;
$this->controlTower->notify($this, FIRE);
}
/**
* @return bool
*/
public function isSafe(): bool
{
return $this->isSafe;
}
/**
* @param bool $isSafe
*/
public function setIsSafe(bool $isSafe): void
{
$this->isSafe = $isSafe;
}
}
class SafetyTeam extends BaseComponent {
public function safeAlarm(){
$this->controlTower->notify($this, SAFE);
}
// Do needed job base on actions or base on needed details for this class...
}
#endregion
/**
* Class ControlTower - Concrete Mediators which its contain relations between various components
*/
class ControlTower implements PilotsMediator {
private Helicopter $helicopter;
private Airbus $airbus;
private Emergency $emergency;
private SafetyTeam $safetyTeam;
/**
* ControlTower constructor.
* @param Helicopter $helicopter
* @param Airbus $airbus
*/
public function __construct(Helicopter $helicopter, Airbus $airbus, Emergency $emergency, SafetyTeam $safetyTeam)
{
$this->helicopter = $helicopter;
$this->helicopter->setControlTower($this);
$this->airbus = $airbus;
$this->airbus->setControlTower($this);
$this->emergency = $emergency;
$this->emergency->setControlTower($this);
$this->safetyTeam = $safetyTeam;
$this->safetyTeam->setControlTower($this);
}
public function notify(BaseComponent $sender, string $event)
{
if($sender instanceof Airbus){
if(!$this->emergency->isSafe()){
echo "Airbus keep fly!, no action since we have emergency Alarm!" . PHP_EOL;
return;
}
if($event === UP){
echo "Airbus: Wait until road is empty!" . PHP_EOL;
}else {
$roadNumber = rand(100, 400);
echo "Airbus: Go to Road Number #{$roadNumber}" . PHP_EOL;
}
}else if($sender instanceof Helicopter){
if(!$this->emergency->isSafe()){
echo "Helicopter keep fly!, no action since we have emergency Alarm!" . PHP_EOL;
return;
}
if($event === UP){
echo "Helicopter: Go Direct" . PHP_EOL;
}else {
echo "Helicopter: Helicopter Circle is empty!" . PHP_EOL;
}
}else if($sender instanceof Emergency){
if($event === FIRE){
echo "We have an Emergency case..." . PHP_EOL;
}
}else if($sender instanceof SafetyTeam){
if($event === SAFE){
$this->emergency->setIsSafe(true);
echo "Its Safe now, you can complete your job!!" . PHP_EOL;
}
}
}
}
// Client
$helicopter = new Helicopter();
$airbus = new Airbus();
$emergency = new Emergency();
$safetyTeam = new SafetyTeam();
$controlTower = new ControlTower($helicopter, $airbus, $emergency, $safetyTeam);
$helicopter->helicopterUP();
echo "============================================" . PHP_EOL;
$emergency->fireAlarm();
$helicopter->helicopterDOWN();
echo "============================================" . PHP_EOL;
$safetyTeam->safeAlarm();
$helicopter->helicopterDOWN();
echo "============================================" . PHP_EOL;
$emergency->fireAlarm();
echo "============================================" . PHP_EOL;
$airbus->airbusDOWN();
$airbus->airbusUP();
echo "============================================" . PHP_EOL;
$safetyTeam->safeAlarm();
$airbus->airbusDOWN();
$airbus->airbusUP();
$airbus->airbusDOWN();