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<?php |
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declare(strict_types = 1); |
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namespace Innmind\Compose; |
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use Innmind\Compose\{ |
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Definition\Name, |
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Definition\Service, |
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Definition\Service\Argument, |
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Definition\Dependency, |
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Exception\ArgumentNotProvided, |
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Exception\ArgumentNotDefined, |
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Exception\CircularDependency |
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}; |
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use Innmind\Immutable\{ |
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Sequence, |
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MapInterface, |
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Map, |
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Pair, |
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Stream |
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}; |
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final class Services |
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{ |
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private $definitions; |
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private $exposed; |
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private $arguments; |
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private $dependencies; |
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private $building; |
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private $instances; |
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public function __construct( |
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Arguments $arguments, |
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Dependencies $dependencies, |
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Service ...$definitions |
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) { |
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$this->arguments = $arguments; |
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$this->dependencies = $dependencies; |
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$this->definitions = Sequence::of(...$definitions)->reduce( |
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new Map('string', Service::class), |
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static function(Map $definitions, Service $definition): Map { |
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return $definitions->put( |
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(string) $definition->name(), |
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$definition |
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); |
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} |
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); |
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$this->exposed = $this |
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->definitions |
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->filter(static function(string $name, Service $definition): bool { |
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return $definition->exposed(); |
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}) |
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->map(static function(string $name, Service $definition): Pair { |
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return new Pair( |
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(string) $definition->exposedAs(), |
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$definition |
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); |
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}); |
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$this->building = Stream::of('string'); |
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$this->instances = new Map('string', 'object'); |
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} |
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public function expose(Name $name, Name $as): self |
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{ |
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$service = $this->get($name)->exposeAs($as); |
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$self = clone $this; |
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$self->definitions = $self->definitions->put( |
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(string) $name, |
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$service |
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); |
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$self->exposed = $self->exposed->put( |
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(string) $as, |
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$service |
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); |
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return $self; |
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} |
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public function stack(Name $name, Name $highest, Name $lower, Name ...$rest): self |
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{ |
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$stack = Sequence::of($lower, ...$rest)->reverse(); |
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$stacked = Sequence::of( |
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$this->get($stack->first()) |
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); |
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$stacked = $stack->drop(1)->reduce( |
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$stacked, |
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function(Sequence $stacked, Name $decorator): Sequence { |
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return $stacked->add( |
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$this->decorate($decorator, $stacked->last()->name()) |
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); |
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} |
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); |
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$stacked = $stacked->add( |
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$this->decorate($highest, $stacked->last()->name(), $name) |
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); |
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$self = clone $this; |
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$self->definitions = $stacked->reduce( |
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$self->definitions, |
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static function(Map $definitions, Service $service): Map { |
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return $definitions->put( |
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(string) $service->name(), |
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$service |
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); |
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} |
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); |
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return $self; |
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} |
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/** |
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* This method must only be called from Dependencies::bind() through self::inject() |
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* |
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* The goal is to iteratively replace in Services the initial Dependency |
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* instance by its resolved version, so other Dependency instances can rely |
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* on it |
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*/ |
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public function feed(Name $dependency): self |
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{ |
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$self = clone $this; |
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$self->dependencies = $self->dependencies->feed($dependency, $self); |
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return $self; |
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} |
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/** |
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* @param MapInterface<string, mixed> $arguments |
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*/ |
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public function inject(MapInterface $arguments): self |
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{ |
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$self = clone $this; |
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$self->arguments = $self->arguments->bind($arguments); |
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$self->building = $self->building->clear(); |
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$self->instances = $self->instances->clear(); |
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return $self->dependencies->bind($self); |
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} |
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public function build(Name $name): object |
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{ |
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$definition = $this->get($name); |
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$name = $definition->name(); |
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if ($this->instances->contains((string) $name)) { |
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return $this->instances->get((string) $name); |
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} |
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try { |
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if ($this->building->contains((string) $name)) { |
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throw new CircularDependency( |
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(string) $this |
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->building |
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->add((string) $name) |
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->join(' -> ') |
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); |
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} |
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$this->building = $this->building->add((string) $name); |
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$service = $definition->build($this); |
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$this->instances = $this->instances->put((string) $name, $service); |
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$this->building = $this->building->dropEnd(1); |
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} catch (\Throwable $e) { |
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$this->building = $this->building->clear(); |
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throw $e; |
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} |
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return $service; |
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} |
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public function arguments(): Arguments |
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{ |
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return $this->arguments; |
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} |
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public function dependencies(): Dependencies |
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{ |
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return $this->dependencies; |
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} |
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public function has(Name $name): bool |
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{ |
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if ($this->definitions->contains((string) $name)) { |
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return true; |
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} |
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return $this->exposed->contains((string) $name); |
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} |
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public function get(Name $name): Service |
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{ |
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try { |
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return $this->definitions->get((string) $name); |
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} catch (\Exception $e) { |
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return $this->exposed->get((string) $name); |
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} |
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} |
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private function decorate( |
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Name $decorator, |
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Name $decorated, |
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Name $newName = null |
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): Service { |
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if ($this->has($decorator)) { |
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return $this->get($decorator)->decorate($decorated, $newName); |
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} |
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return $this->dependencies->decorate($decorator, $decorated, $newName); |
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} |
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} |
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Innmind /
Compose
