将范围数据传递到服务容器

Question

我希望创建一个新的SomeService实例，该实例必须注入一些在Pimple中定义服务时未知的数据。以下技术上可行，但肯定不是正确的方法。应该如何完成？

<?php
use Pimple\Container;

class SomeService
{
    private $theNewData;
    public function __construct(MyPdo $pdo, array $theNewData){
        $this->theNewData=$theNewData;
    }
    public function getJsonString():string{
        return json_encode($this->theNewData);
    }
}
class MyPdo{}

function getServiceSometimeInTheFuture(Container $container):SomeService {
    $someFutureData= ['a'=>1,'b'=>2,'c'=>3,];

    /*
    How do I inject this content into SomeService other than using Pimple as a temporary transport?
    */
    $container['temp']=$someFutureData;
    $newInstance=$container['someService'];
    unset($container['temp']);
    return $newInstance;
}

require '../vendor/autoload.php';

$container=new Container();

$container['myPdo'] = function ($c) {
    return new MyPdo();
};

$container['someService'] = $container->factory(function ($c) {
    return new SomeService($c['myPdo'], $c['temp']);
});

$service = getServiceSometimeInTheFuture($container);
echo($service->getJsonString());

Answer 1

除了使用Pimple作为临时传输方式之外，我如何将此内容注入SomeService？

我认为这个问题的根本原因是future data实际上是数据，顾名思义，它将随时间变化多次，因此在服务定义时不应将其传递给服务，但每次服务中的使用者方法（此处为getJsonString）每次都需要该数据时。

...定义服务时未知

数据未知，但是数据来源呢？您可以编写一个新的服务来充当数据提供者，以便原始服务可以获取所需的数据吗？[[将来需要时]我可以提出两种解决方案。（我故意从任何地方删除MyPdo，因为即使在构造函数中也没有使用它）

如果您确实需要在创建时将数据传递到服务：

<?php
require __DIR__ . '/../vendor/autoload.php';
use Pimple\Container;

class SomeService
{
    private $theNewData;
    public function __construct(array $theNewData){
        $this->theNewData=$theNewData;
    }
    public function getJsonString():string{
        return json_encode($this->theNewData);
    }
}

$container=new Container();

// Use pimple factory method to create new service instance, instead of creatng a custom function
$container['getServiceSometimeInTheFuture'] = $container->factory(function (Container $c):SomeService {
    return new SomeService($c['futureData']);
});

// `futureData` returns new data every time
$container['futureData'] = $container->factory(function(){
    return ['a' => rand(1, 10), 'b' => rand(1, 10), 'c' => rand(1, 10), ];
});

$service1 = $container['getServiceSometimeInTheFuture'];
$service2 = $container['getServiceSometimeInTheFuture'];

// Demonstrate how two different instances have different, persistent data
echo("\nservice 1:" . $service1->getJsonString());
echo("\nservice 2:" . $service2->getJsonString());
echo("\nservice 1:" . $service1->getJsonString());
echo("\nservice 2:" . $service2->getJsonString());

如果将来以后需要将数据提供给someService时可以推迟：

<?php
require __DIR__ . '/../vendor/autoload.php';
use Pimple\Container;

// DataProvider decides what data should be provided to the service
class DataProvider {
    public function getData(){
        return ['a' => rand(1, 10), 'b' => rand(1, 10), 'c' => rand(1, 10), ];
    }
}

class SomeService
{
    private $dataProvider;
    public function __construct(DataProvider $dataProvider){
        $this->dataProvider=$dataProvider;
    }
    public function getJsonString():string{
        return json_encode($this->dataProvider->getData());
    }
}

$container=new Container();

// Use pimple factory method to create new service instance, instead of creatng a custom function
$container['getServiceSometimeInTheFuture'] = $container->factory(function (Container $c):SomeService {
    return new SomeService($c['dataProvider']);
});

$container['dataProvider'] = function() {
    return new DataProvider;
};

$service = $container['getServiceSometimeInTheFuture'];

// Demonstrate how THE SAME INSTANCE will have different data every time
echo("\n" . $service->getJsonString());
echo("\n" . $service->getJsonString());
echo("\n" . $service->getJsonString());
echo("\n" . $service->getJsonString());