晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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<?php
declare(strict_types=1);
namespace DI;
use DI\Compiler\RequestedEntryHolder;
use DI\Definition\Definition;
use DI\Definition\Exception\InvalidDefinition;
use DI\Invoker\FactoryParameterResolver;
use Invoker\Exception\NotCallableException;
use Invoker\Exception\NotEnoughParametersException;
use Invoker\Invoker;
use Invoker\InvokerInterface;
use Invoker\ParameterResolver\AssociativeArrayResolver;
use Invoker\ParameterResolver\DefaultValueResolver;
use Invoker\ParameterResolver\NumericArrayResolver;
use Invoker\ParameterResolver\ResolverChain;
/**
* Compiled version of the dependency injection container.
*
* @author Matthieu Napoli <matthieu@mnapoli.fr>
*/
abstract class CompiledContainer extends Container
{
/**
* This const is overridden in child classes (compiled containers).
* @var array
*/
protected const METHOD_MAPPING = [];
private ?InvokerInterface $factoryInvoker = null;
public function get(string $id) : mixed
{
// Try to find the entry in the singleton map
if (isset($this->resolvedEntries[$id]) || array_key_exists($id, $this->resolvedEntries)) {
return $this->resolvedEntries[$id];
}
/** @psalm-suppress UndefinedConstant */
$method = static::METHOD_MAPPING[$id] ?? null;
// If it's a compiled entry, then there is a method in this class
if ($method !== null) {
// Check if we are already getting this entry -> circular dependency
if (isset($this->entriesBeingResolved[$id])) {
$idList = implode(' -> ', [...array_keys($this->entriesBeingResolved), $id]);
throw new DependencyException("Circular dependency detected while trying to resolve entry '$id': Dependencies: " . $idList);
}
$this->entriesBeingResolved[$id] = true;
try {
$value = $this->$method();
} finally {
unset($this->entriesBeingResolved[$id]);
}
// Store the entry to always return it without recomputing it
$this->resolvedEntries[$id] = $value;
return $value;
}
return parent::get($id);
}
public function has(string $id) : bool
{
// The parent method is overridden to check in our array, it avoids resolving definitions
/** @psalm-suppress UndefinedConstant */
if (isset(static::METHOD_MAPPING[$id])) {
return true;
}
return parent::has($id);
}
protected function setDefinition(string $name, Definition $definition) : void
{
// It needs to be forbidden because that would mean get() must go through the definitions
// every time, which kinds of defeats the performance gains of the compiled container
throw new \LogicException('You cannot set a definition at runtime on a compiled container. You can either put your definitions in a file, disable compilation or ->set() a raw value directly (PHP object, string, int, ...) instead of a PHP-DI definition.');
}
/**
* Invoke the given callable.
*/
protected function resolveFactory($callable, $entryName, array $extraParameters = []) : mixed
{
// Initialize the factory resolver
if (! $this->factoryInvoker) {
$parameterResolver = new ResolverChain([
new AssociativeArrayResolver,
new FactoryParameterResolver($this->delegateContainer),
new NumericArrayResolver,
new DefaultValueResolver,
]);
$this->factoryInvoker = new Invoker($parameterResolver, $this->delegateContainer);
}
$parameters = [$this->delegateContainer, new RequestedEntryHolder($entryName)];
$parameters = array_merge($parameters, $extraParameters);
try {
return $this->factoryInvoker->call($callable, $parameters);
} catch (NotCallableException $e) {
throw new InvalidDefinition("Entry \"$entryName\" cannot be resolved: factory " . $e->getMessage());
} catch (NotEnoughParametersException $e) {
throw new InvalidDefinition("Entry \"$entryName\" cannot be resolved: " . $e->getMessage());
}
}
}