Question

我需要从一组实体中删除一些实体，为此，我一个接一个地调用4个服务，以删除与某些过滤器不匹配的实体。

class MainService
{
    public function removeEntities($collection)
    {
        $collection = $this->subServiceA->removeEntities($collection);
        $collection = $this->subServiceB->removeEntities($collection);
        $collection = $this->subServiceC->removeEntities($collection);
        $collection = $this->subServiceD->removeEntities($collection);

        return $collection;
    }
}

我认为装饰者，责任链或观察员可以处理此案，但我不知道哪个人最适合。

Answer 1

一种简单的队列样式方法应该可以解决此问题。

interface IEntityWorker {
    function process($item);
}

class Queue {
    protected $workers = [];

    public function registerWorker(IEntityWorker $worker) {
        $this->workers[] = $worker;
    }

    public function process($item) {
        foreach ($this->workers as $worker) {
            $item = $worker->process($item);
        }
        return $item;
    }
}

减少实体集合的哪种设计模式？

1 个答案: