Container::generateExtendedInstance() - Code Metrics - Inspection of "Merge pull request #11 from gacela-project/infecti..." - gacela-project/container - Measure and Improve Code Quality continuously with Scrutinizer

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by Chema

created 2023-05-03 09:26 UTC

Container::generateExtendedInstance() A

↳ Parent: Container

Complexity

Conditions	4
Paths	3

Size

Total Lines	15
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	9
CRAP Score	4

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
eloc	7
c	1
b	0
f	0
dl	0
loc	15
ccs	9
cts	9
cp	1
rs	10
cc	4
nc	3
nop	2
crap	4

<?php

declare(strict_types=1);

namespace Gacela\Container;

use Closure;
use Gacela\Container\Exception\ContainerException;
use SplObjectStorage;

use function count;
use function is_array;
use function is_callable;
use function is_object;

class Container implements ContainerInterface
{
    private ?DependencyResolver $dependencyResolver = null;

    /** @var array<class-string,list<mixed>> */
    private array $cachedDependencies = [];

    /** @var array<string,mixed> */
    private array $instances = [];

    private SplObjectStorage $factoryInstances;

    private SplObjectStorage $protectedInstances;

    /** @var array<string,bool> */
    private array $frozenInstances = [];

    private ?string $currentlyExtending = null;

    /**
     * @param array<class-string, class-string|callable|object> $bindings
     * @param array<string, list<Closure>> $instancesToExtend
     */
    public function __construct(
        private array $bindings = [],
        private array $instancesToExtend = [],
    ) {
        $this->factoryInstances = new SplObjectStorage();
        $this->protectedInstances = new SplObjectStorage();
    }

    /**
     * @param class-string $className
     */
    public static function create(string $className): mixed
    {
        return (new self())->get($className);
    }

    public function has(string $id): bool
    {
        return isset($this->instances[$id]);
    }

    public function set(string $id, mixed $instance): void
    {
        if (!empty($this->frozenInstances[$id])) {
            throw ContainerException::frozenInstanceOverride($id);
        }

        $this->instances[$id] = $instance;

        if ($this->currentlyExtending === $id) {
            return;
        }

        $this->extendService($id);
    }

    /**
     * @param class-string|string $id
     */
    public function get(string $id): mixed
    {
        if ($this->has($id)) {
            return $this->getInstance($id);
        }

        return $this->createInstance($id);
    }

    public function factory(Closure $instance): Closure
    {
        $this->factoryInstances->attach($instance);

        return $instance;
    }

    public function remove(string $id): void
    {
        unset(
            $this->instances[$id],
            $this->frozenInstances[$id]
        );
    }

    /**
     * @psalm-suppress MixedAssignment
     */
    public function extend(string $id, Closure $instance): Closure
    {
        if (!$this->has($id)) {
            $this->extendLater($id, $instance);

            return $instance;
        }

        if (isset($this->frozenInstances[$id])) {
            throw ContainerException::frozenInstanceExtend($id);
        }

        if (is_object($this->instances[$id]) && isset($this->protectedInstances[$this->instances[$id]])) {
            throw ContainerException::instanceProtected($id);
        }

        $factory = $this->instances[$id];
        $extended = $this->generateExtendedInstance($instance, $factory);
        $this->set($id, $extended);

        return $extended;
    }

    public function protect(Closure $instance): Closure
    {
        $this->protectedInstances->attach($instance);

        return $instance;
    }

    private function getInstance(string $id): mixed
    {
        $this->frozenInstances[$id] = true;

        if (!is_object($this->instances[$id])
            || isset($this->protectedInstances[$this->instances[$id]])
            || !method_exists($this->instances[$id], '__invoke')
        ) {
            return $this->instances[$id];
        }

        if (isset($this->factoryInstances[$this->instances[$id]])) {
            return $this->instances[$id]($this);
        }

        $rawService = $this->instances[$id];

        /** @var mixed $resolvedService */
        $resolvedService = $rawService($this);

        $this->instances[$id] = $resolvedService;

        return $resolvedService;
    }

    private function createInstance(string $class): ?object
    {
        if (isset($this->bindings[$class])) {
            $binding = $this->bindings[$class];
            if (is_callable($binding)) {
                /** @var mixed $binding */
                $binding = $binding();
            }
            if (is_object($binding)) {
                return $binding;
            }

            /** @var class-string $binding */
            if (class_exists($binding)) {
                return $this->instantiateClass($binding);
            }
        }

        if (class_exists($class)) {
            return $this->instantiateClass($class);
        }

        return null;
    }

    /**
     * @param class-string $class
     */
    private function instantiateClass(string $class): ?object
    {
        if (class_exists($class)) {
            if (!isset($this->cachedDependencies[$class])) {
                $this->cachedDependencies[$class] = $this
                    ->getDependencyResolver()
                    ->resolveDependencies($class);
            }

            /** @psalm-suppress MixedMethodCall */
            return new $class(...$this->cachedDependencies[$class]);
        }

        return null;
    }

    private function extendLater(string $id, Closure $instance): void
    {
        $this->instancesToExtend[$id][] = $instance;
    }

    private function getDependencyResolver(): DependencyResolver
    {
        if ($this->dependencyResolver === null) {
            $this->dependencyResolver = new DependencyResolver(
                $this->bindings,
            );
        }

        return $this->dependencyResolver;

    }

    /**
     * @psalm-suppress MissingClosureReturnType,MixedAssignment
     */
    private function generateExtendedInstance(Closure $instance, mixed $factory): Closure
    {
        if (is_callable($factory)) {
            return static function (self $container) use ($instance, $factory) {
                $result = $factory($container);

                return $instance($result, $container) ?? $result;
            };
        }

        if (is_object($factory) || is_array($factory)) {
            return static fn (self $container) => $instance($factory, $container) ?? $factory;
        }

        throw ContainerException::instanceNotExtendable();
    }

    private function extendService(string $id): void
    {
        if (!isset($this->instancesToExtend[$id]) || count($this->instancesToExtend[$id]) === 0) {
            return;
        }
        $this->currentlyExtending = $id;

        foreach ($this->instancesToExtend[$id] as $instance) {
            $this->extend($id, $instance);
        }

        unset($this->instancesToExtend[$id]);
        $this->currentlyExtending = null;
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		namespace Gacela\Container;
6
7		use Closure;
8		use Gacela\Container\Exception\ContainerException;
9		use SplObjectStorage;
10
11		use function count;
12		use function is_array;
13		use function is_callable;
14		use function is_object;
15
16		class Container implements ContainerInterface
17		{
18		private ?DependencyResolver $dependencyResolver = null;
19
20		/** @var array<class-string,list<mixed>> */
21		private array $cachedDependencies = [];
22
23		/** @var array<string,mixed> */
24		private array $instances = [];
25
26		private SplObjectStorage $factoryInstances;
27
28		private SplObjectStorage $protectedInstances;
29
30		/** @var array<string,bool> */
31		private array $frozenInstances = [];
32
33		private ?string $currentlyExtending = null;
34
35		/**
36		* @param array<class-string, class-string\|callable\|object> $bindings
37		* @param array<string, list<Closure>> $instancesToExtend
38		*/
39	37	public function __construct(
40		private array $bindings = [],
41		private array $instancesToExtend = [],
42		) {
43	37	$this->factoryInstances = new SplObjectStorage();
44	37	$this->protectedInstances = new SplObjectStorage();
45		}
46
47		/**
48		* @param class-string $className
49		*/
50	5	public static function create(string $className): mixed
51		{
52	5	return (new self())->get($className);
53		}
54
55	37	public function has(string $id): bool
56		{
57	37	return isset($this->instances[$id]);
58		}
59
60	19	public function set(string $id, mixed $instance): void
61		{
62	19	if (!empty($this->frozenInstances[$id])) {
63	1	throw ContainerException::frozenInstanceOverride($id);
64		}
65
66	19	$this->instances[$id] = $instance;
67
68	19	if ($this->currentlyExtending === $id) {
69	3	return;
70		}
71
72	19	$this->extendService($id);
73		}
74
75		/**
76		* @param class-string\|string $id
77		*/
78	33	public function get(string $id): mixed
79		{
80	33	if ($this->has($id)) {
81	15	return $this->getInstance($id);
82		}
83
84	18	return $this->createInstance($id);
85		}
86
87	1	public function factory(Closure $instance): Closure
88		{
89	1	$this->factoryInstances->attach($instance);
90
91	1	return $instance;
92		}
93
94	1	public function remove(string $id): void
95		{
96	1	unset(
97	1	$this->instances[$id],
98	1	$this->frozenInstances[$id]
99	1	);
100		}
101
102		/**
103		* @psalm-suppress MixedAssignment
104		*/
105	11	public function extend(string $id, Closure $instance): Closure
106		{
107	11	if (!$this->has($id)) {
108	4	$this->extendLater($id, $instance);
109
110	4	return $instance;
111		}
112
113	10	if (isset($this->frozenInstances[$id])) {
114	4	throw ContainerException::frozenInstanceExtend($id);
115		}
116
117	8	if (is_object($this->instances[$id]) && isset($this->protectedInstances[$this->instances[$id]])) {
118	1	throw ContainerException::instanceProtected($id);
119		}
120
121	7	$factory = $this->instances[$id];
122	7	$extended = $this->generateExtendedInstance($instance, $factory);
123	6	$this->set($id, $extended);
124
125	6	return $extended;
126		}
127
128	2	public function protect(Closure $instance): Closure
129		{
130	2	$this->protectedInstances->attach($instance);
131
132	2	return $instance;
133		}
134
135	15	private function getInstance(string $id): mixed
136		{
137	15	$this->frozenInstances[$id] = true;
138
139	15	if (!is_object($this->instances[$id])
140	14	\|\| isset($this->protectedInstances[$this->instances[$id]])
141	15	\|\| !method_exists($this->instances[$id], '__invoke')
142		) {
143	8	return $this->instances[$id];
144		}
145
146	12	if (isset($this->factoryInstances[$this->instances[$id]])) {
147	1	return $this->instances[$id]($this);
148		}
149
150	11	$rawService = $this->instances[$id];
151
152		/** @var mixed $resolvedService */
153	11	$resolvedService = $rawService($this);
154
155	11	$this->instances[$id] = $resolvedService;
156
157	11	return $resolvedService;
158		}
159
160	18	private function createInstance(string $class): ?object
161		{
162	18	if (isset($this->bindings[$class])) {
163	4	$binding = $this->bindings[$class];
164	4	if (is_callable($binding)) {
165		/** @var mixed $binding */
166	2	$binding = $binding();
167		}
168	4	if (is_object($binding)) {
169	2	return $binding;
170		}
171
172		/** @var class-string $binding */
173	2	if (class_exists($binding)) {
174	2	return $this->instantiateClass($binding);
175		}
176		}
177
178	14	if (class_exists($class)) {
179	10	return $this->instantiateClass($class);
180		}
181
182	4	return null;
183		}
184
185		/**
186		* @param class-string $class
187		*/
188	12	private function instantiateClass(string $class): ?object
189		{
190	12	if (class_exists($class)) {
191	12	if (!isset($this->cachedDependencies[$class])) {
192	12	$this->cachedDependencies[$class] = $this
193	12	->getDependencyResolver()
194	12	->resolveDependencies($class);
195		}
196
197		/** @psalm-suppress MixedMethodCall */
198	12	return new $class(...$this->cachedDependencies[$class]);
199		}
200
201		return null;
202		}
203
204	4	private function extendLater(string $id, Closure $instance): void
205		{
206	4	$this->instancesToExtend[$id][] = $instance;
207		}
208
209	12	private function getDependencyResolver(): DependencyResolver
210		{
211	12	if ($this->dependencyResolver === null) {
212	12	$this->dependencyResolver = new DependencyResolver(
213	12	$this->bindings,
214	12	);
215		}
216
217	12	return $this->dependencyResolver;
		1 ignored issue – show Bug Best Practice introduced 2023-04-24 07:23 UTC by Report Bug Copy Issue Report The expression `return $this->dependencyResolver` could return the type `null` which is incompatible with the type-hinted return `Gacela\Container\DependencyResolver`. Consider adding an additional type-check to rule them out. Loading history...
218		}
219
220		/**
221		* @psalm-suppress MissingClosureReturnType,MixedAssignment
222		*/
223	7	private function generateExtendedInstance(Closure $instance, mixed $factory): Closure
224		{
225	7	if (is_callable($factory)) {
226	5	return static function (self $container) use ($instance, $factory) {
227	5	$result = $factory($container);
228
229	5	return $instance($result, $container) ?? $result;
230	5	};
231		}
232
233	4	if (is_object($factory) \|\| is_array($factory)) {
234	3	return static fn (self $container) => $instance($factory, $container) ?? $factory;
235		}
236
237	1	throw ContainerException::instanceNotExtendable();
238		}
239
240	19	private function extendService(string $id): void
241		{
242	19	if (!isset($this->instancesToExtend[$id]) \|\| count($this->instancesToExtend[$id]) === 0) {
243	16	return;
244		}
245	3	$this->currentlyExtending = $id;
246
247	3	foreach ($this->instancesToExtend[$id] as $instance) {
248	3	$this->extend($id, $instance);
249		}
250
251	3	unset($this->instancesToExtend[$id]);
252	3	$this->currentlyExtending = null;
253		}
254		}
255

gacela-project / container

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Container::generateExtendedInstance() A

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