策略设计模式中开关上下文中的许多依赖项

Question

我使用了策略设计模式，并且在Switch中通过的案例实例化时有许多依赖项问题。是否有干净的解决方案不通过这些依赖性？

这是我的信用服务：

class CreditService
{
    public function addCredit($transaction)
    {
        $creditContext = new CreditContext();
        $creditStrategy = $creditContext->setStrategy($transaction->transaction_type);
        $creditStrategy->add($transaction->id);
    }
}

这是我的CreditContext，在sumpleerertransactionservice和transactionservice中具有许多依赖关系

class CreditContext
{
    /**
     * @param $strategy
     * @return InvoiceStrategy|UserStrategy
     * @throws \Exception
     */
    public function setStrategy($strategy)
    {
        switch ($strategy) {
            case User::class:
                return new UserStrategy(
                    new EmployerTransactionService(new TransactionService(dependencies..),dependencies..);
            case Proposal::class:
            case Milestone::class:
                return new InvoiceStrategy(
                    new TransactionService(
                        new PaymentService(new PaymentRepository(), new CreditRepository(), new TransactionRepository()),
                        new TransactionRepository(),
                        new CreditRepository(),
                        new IncomeReportService(new IncomeReportRepository()),
                        new CreditService())
                );
            default:
                throw new \Exception('not found strategy');
        }
    }
}

Answer 1

您必须使用依赖项注入容器这是解决所有问题的解决方案，

最终您的最终代码最终是看起来像这样

class CreditContext
{
    protected $strategies = [
        User::class,
        Proposal::class,
        Milestone::class
    ];

    public function make($type)
    {
        if (in_array($type, $this->strategies, true)) {
            $container = Container::getInstance();

            return $container->get($this->strategies[$type]);
        }

        throw new RuntimeException('Strategy not found');
    }
}