PHP의 명령 패턴에 대한 심층 분석

class Invoker { public $command; public function __construct($command) { $this->command = $command; } public function exec() { $this->command->execute(); } }

abstract class Command { protected $receiver; public function __construct(Receiver $receiver) { $this->receiver = $receiver; } abstract public function execute(); } class ConcreteCommand extends Command { public function execute() { $this->receiver->action(); } }

class Receiver { public $name; public function __construct($name) { $this->name = $name; } public function action() { echo $this->name . '命令执行了！', PHP_EOL; } }

// 准备执行者 $receiverA = new Receiver('A'); // 准备命令 $command = new ConcreteCommand($receiverA); // 请求者 $invoker = new Invoker($command); $invoker->exec();

command[] = $command; } public function exec() { if(count($this->command) > 0){ foreach ($this->command as $command) { $command->execute(); } } } public function undo() { if(count($this->command) > 0){ foreach ($this->command as $command) { $command->undo(); } } } } abstract class Command { protected $receiver; protected $state; protected $name; public function __construct(Receiver $receiver, $name) { $this->receiver = $receiver; $this->name = $name; } abstract public function execute(); } class ConcreteCommand extends Command { public function execute() { if (!$this->state || $this->state == 2) { $this->receiver->action(); $this->state = 1; } else { echo $this->name . '命令正在执行，无法再次执行了！', PHP_EOL; } } public function undo() { if ($this->state == 1) { $this->receiver->undo(); $this->state = 2; } else { echo $this->name . '命令未执行，无法撤销了！', PHP_EOL; } } } class Receiver { public $name; public function __construct($name) { $this->name = $name; } public function action() { echo $this->name . '命令执行了！', PHP_EOL; } public function undo() { echo $this->name . '命令撤销了！', PHP_EOL; } } // 准备执行者 $receiverA = new Receiver('A'); $receiverB = new Receiver('B'); $receiverC = new Receiver('C'); // 准备命令 $commandOne = new ConcreteCommand($receiverA, 'A'); $commandTwo = new ConcreteCommand($receiverA, 'B'); $commandThree = new ConcreteCommand($receiverA, 'C'); // 请求者 $invoker = new Invoker(); $invoker->setCommand($commandOne); $invoker->setCommand($commandTwo); $invoker->setCommand($commandThree); $invoker->exec(); $invoker->undo(); // 新加一个单独的执行者，只执行一个命令 $invokerA = new Invoker(); $invokerA->setCommand($commandOne); $invokerA->exec(); // 命令A已经执行了，再次执行全部的命令执行者，A命令的state判断无法生效 $invoker->exec();

command[] = $command; } public function send($msg) { foreach ($this->command as $command) { $command->execute($msg); } } } abstract class Command { protected $receiver = []; public function setReceiver($receiver) { $this->receiver[] = $receiver; } abstract public function execute($msg); } class SendAliYun extends Command { public function execute($msg) { foreach ($this->receiver as $receiver) { $receiver->action($msg); } } } class SendJiGuang extends Command { public function execute($msg) { foreach ($this->receiver as $receiver) { $receiver->action($msg); } } } class SendAliYunMsg { public function action($msg) { echo '【阿X云短信】发送：' . $msg, PHP_EOL; } } class SendAliYunPush { public function action($msg) { echo '【阿X云推送】发送：' . $msg, PHP_EOL; } } class SendJiGuangMsg { public function action($msg) { echo '【极X短信】发送：' . $msg, PHP_EOL; } } class SendJiGuangPush { public function action($msg) { echo '【极X推送】发送：' . $msg, PHP_EOL; } } $aliMsg = new SendAliYunMsg(); $aliPush = new SendAliYunPush(); $jgMsg = new SendJiGuangMsg(); $jgPush = new SendJiGuangPush(); $sendAliYun = new SendAliYun(); $sendAliYun->setReceiver($aliMsg); $sendAliYun->setReceiver($aliPush); $sendJiGuang = new SendJiGuang(); $sendAliYun->setReceiver($jgMsg); $sendAliYun->setReceiver($jgPush); $sendMsg = new SendMsg(); $sendMsg->setCommand($sendAliYun); $sendMsg->setCommand($sendJiGuang); $sendMsg->send('这次要搞个大活动，快来注册吧！！');