註冊模式，如果應用程式內有非常多同樣的物件需要高度重複讀寫，就會去建立一個儲存器來負責管理這些同樣的物件，就有點像是你的大頭菜，會來自不同的島，每座的島菜價不同，這會導致你很難算出所賺到的鈴錢，所以如果每個大頭菜都需要登記註冊，然後有個集中管理的名冊，在管理大頭菜這件事上就能比較輕鬆。
首先我們會先建立需要被集中管理的大頭菜物件，裡面提供了簡單的幾些方法，例如賦予獲得島嶼名稱、鈴錢以及數量。
/**
* Class Turnips.
*/
class Turnips
{
/**
* @var string
*/
public string $island;
/**
* @var int
*/
public int $price;
/**
* @var int
*/
public int $count;
/**
* Turnips constructor.
*
* @param string $island
* @param int $price
* @param int $count
*/
public function __construct(string $island, int $price, int $count)
{
$this->setIsland($island);
$this->setPrice($price);
$this->setCount($count);
}
/**
* @param string $island
*/
public function setIsland(string $island)
{
$this->island = $island;
}
/**
* @param int $price
*/
public function setPrice(int $price)
{
$this->price = $price;
}
/**
* @param int $count
*/
public function setCount(int $count)
{
$this->count = $count;
}
/**
* @return string
*/
public function getIsland(): string
{
return $this->island;
}
/**
* @return int
*/
public function getPrice(): int
{
return $this->price;
}
/**
* @return int
*/
public function getCount(): int
{
return $this->count;
}
}
再來我們需要建立一個集中管理大頭菜的抽象註冊器，無論是找尋(find...)註冊、更新或刪除，這些事情都會集中在這裡實踐。
use InvalidArgumentException;
/**
* Abstract Registry.
*/
abstract class Registry
{
/**
* @var Turnips[]
*/
protected static array $turnips = [];
/**
* @param
*
* @throws InvalidArgumentException
* @return Turnips|null
*/
public static function findTurnipsByIsland(string $island)
{
foreach (self::$turnips as $turnip) {
if ($island === $turnip->getIsland()) {
return $turnip;
}
}
throw new InvalidArgumentException('大頭菜儲存容器找不到目標。');
}
/**
* @param
*
* @return Turnips|null
*/
public static function findIndexByIsland(string $island)
{
foreach (self::$turnips as $index => $turnip) {
if ($island === $turnip->getIsland()) {
return $index;
}
}
return null;
}
/**
* @param string $island
* @param Turnips $turnip
*
* @throws InvalidArgumentException
*/
public static function store(Turnips $turnip)
{
if (self::findIndexByIsland($turnip->getIsland())) {
throw new InvalidArgumentException('大頭菜儲存容器已經包含這顆大頭菜了。');
}
array_push(self::$turnips, $turnip);
}
/**
* @param Turnips $turnip
*
* @throws InvalidArgumentException
*/
public static function update(Turnips $turnips)
{
if ($index = self::findIndexByIsland($turnips->getIsland())) {
self::$turnips[$index]->setPrice($turnips->getPrice());
self::$turnips[$index]->setCount($turnips->getCount());
return;
}
throw new InvalidArgumentException('大頭菜儲存容器找不到目標。');
}
/**
* @param string $island
* @param Turnips $turnip
*
* @throws InvalidArgumentException
*/
public static function destroy(Turnips $turnips)
{
if ($index = self::findIndexByIsland($turnips->getIsland())) {
unset(self::$turnips[$index]);
return;
}
throw new InvalidArgumentException('大頭菜儲存容器找不到目標。');
}
}
註冊器寫完以後，雖然程式很簡短，但需要做的測試有不少，會有幾個需要做的測試項目：
use InvalidArgumentException;
/**
* Class RegistryPatternTest.
*/
class RegistryPatternTest extends TestCase
{
/**
* 測試是否能夠建立大頭菜，放入後並取出是稍早建立的大頭菜。
*
* @test
*/
public function test_registry_store()
{
$turnips = new Turnips('Island_A', 100, 40);
Registry::store($turnips);
$this->assertSame($turnips, Registry::findTurnipsByIsland('Island_A'));
}
/**
* 測試連續建立重複的大頭菜是否會獲得錯誤。
*
* @test
*/
public function test_registry_store_exception()
{
$this->expectException(InvalidArgumentException::class);
$turnips = new Turnips('Island_B', 100, 40);
Registry::store($turnips);
Registry::store($turnips);
}
/**
* 測試直接獲取不存在的大頭菜索引是否會獲得空值。
*
* @test
*/
public function test_registry_get_exception()
{
$this->assertNull(Registry::findIndexByIsland('Island_Null'));
}
/**
* 測試建立大頭菜並更新大頭菜之後，大頭菜資訊是否有正確更新。
*
* @test
*/
public function test_registry_update()
{
$turnips = new Turnips('Island_C', 100, 40);
Registry::store($turnips);
$turnips->setPrice(90);
$turnips->setCount(20);
Registry::update($turnips);
$this->assertSame($turnips, Registry::findTurnipsByIsland('Island_C'));
}
/**
* 測試大頭菜是否能夠被移除。
*
* @test
*/
public function test_registry_destroy()
{
$turnips = new Turnips('Island_D', 100, 40);
Registry::store($turnips);
$this->assertSame($turnips, Registry::findTurnipsByIsland('Island_D'));
$this->expectException(InvalidArgumentException::class);
Registry::destroy($turnips);
Registry::findTurnipsByIsland('Island_D');
}
}
最後測試的執行結果會獲得如下：
PHPUnit Pretty Result Printer 0.28.0 by Codedungeon and contributors.
==> Configuration: ~/php-design-pattern/vendor/codedungeon/phpunit-result-printer/src/phpunit-printer.yml
PHPUnit 9.2.6 by Sebastian Bergmann and contributors.
==> AbstractFactoryTest ✔ ✔ ✔ ✔
==> BuilderPatternTest ✔ ✔ ✔ ✔
==> FactoryMethodTest ✔ ✔ ✔ ✔
==> PoolPatternTest ✔ ✔
==> PrototypePatternTest ✔ ✔
==> SimpleFactoryTest ✔ ✔ ✔ ✔
==> SingletonPatternTest ✔
==> StaticFactoryTest ✔ ✔ ✔ ✔ ✔
==> AdapterPatternTest ✔ ✔
==> BridgePatternTest ✔ ✔ ✔
==> CompositePatternTest ✔ ✔ ✔
==> DataMapperTest ✔ ✔
==> DecoratorPatternTest ✔ ✔
==> DependencyInjectionTest ✔ ✔ ✔
==> FacadePatternTest ✔
==> FluentInterfaceTest ✔
==> FlyweightPatternTest ✔
==> ProxyPatternTest ✔ ✔
==> RegistryPatternTest ✔ ✔ ✔ ✔ ✔
Time: 00:00.037, Memory: 6.00 MB
OK (51 tests, 116 assertions)
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