設計モードの観察者モード&&状態モード
9854 ワード
<?php
interface Subject {
function attach($obj);
function detach($name);
function notify();
}
class Teacher implements Subject {
private $attachArr = array();
function __construct() {
}
function attach($obj) {
array_push($this->attachArr, $obj);
}
function detach($name) {
unset($name);
}
function notify() {
foreach($this->attachArr as $obj) {
$obj->work();
}
}
function setStatus($status) {
$this->status = $status;
}
} interface Observe { function work(); }
class Student implements Observe {
function __construct($name, $work, $subjectObj) {
$this->name = $name;
$this->subjectObj = $subjectObj;
$this->work = $work;
}
function work() {
echo $this->subjectObj->status . "
" .$this->name . $this->work . "
";
}
}
$teacher = new Teacher();
$student1 = new Student('joey', 'paly table tenice', $teacher);
$student2 = new Student('jam', 'sleeping', $teacher);
$teacher->attach($student1);
$teacher->attach($student2);
$teacher->setStatus("quitting time
");
$teacher->notify();以上のコードはオブザーバーモード
オブザーバモードは、1つのオブジェクトの状態が変化すると、他の関連オブジェクトも対応します.
オブザーバモードの欠点:各オブザーバオブジェクトはこの抽出されたインタフェースクラス(ここのワークなど)を継承しなければならず、いくつかの不便をもたらします.
依頼で実現できます.
<?php
//
abstract class State {
abstract function writeProgram(Work $work);
}
class ForenoonState extends State {
function writeProgram(Work $work) {
if ($work->hour < 12) {
echo ' ' . $work->hour . ' ';
} else {
$work->setState(new NoonState());
$work->writeProgram();
}
}
}
class NoonState extends State {
function writeProgram(Work $work) {
if ($work->hour < 13 && $work->hour >= 12) {
echo ' ' . $work->hour . ' ';
} else {
$work->setState( new AfternoonState());
$work->writeProgram();
}
}
}
class AfternoonState extends State {
function writeProgram(Work $work) {
if ($work->hour > 13 && $work->hour < 17) {
echo ' ' . $work->hour . ' ';
} else {
$work->setState(new EveningState());
$work->writeProgram();
}
}
}
class EveningState extends State {
function writeProgram(Work $work) {
if ($work->finish) {
$work->setState(new RestState());
$work->writeProgram();
} else {
if ($work->hour < 21) {
echo ' ' . $work->hour . ' ';
}
}
}
}
class RestState extends State {
function writeProgram(Work $work) {
echo ' ' . $work->hour . ' ';
}
}
class Work {
private $state;
public $hour;
public $finish = false;
function __construct() {
$this->state = new ForenoonState();
}
function setState($state) {
$this->state = $state;
}
function taskFinished() {
$this->finish = true;
}
function writeProgram() {
$this->state->writeProgram($this);
}
}
$task = new Work();
$task->hour = 8;
$task->writeProgram();
$task->hour = 12;
$task->writeProgram();
$task->hour = 15;
$task->writeProgram();
$task->hour = 20;
$task->taskFinished();
$task->writeProgram();ステータスモードは、判断ロジックが長すぎる場合に、新しいステータスが追加された場合に元のステータスを変更しないコードに適応します.