Promise::settle() - Code Metrics - carno-php/promise - Measure and Improve Code Quality continuously with Scrutinizer

Promise::settle() C
last analyzed 2019-07-26 02:30 UTC

↳ Parent: Promise

Complexity

Conditions	14
Paths	21

Size

Total Lines	47
Code Lines	28

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	1

Metric	Value
cc	14
eloc	28
c	1
b	0
f	1
nc	21
nop	2
dl	0
loc	47
rs	6.2666

How to fix Complexity

<?php
/**
 * Promise EXPR
 * User: moyo
 * Date: 03/08/2017
 * Time: 11:54 AM
 */

namespace Carno\Promise;

use Carno\Promise\Exception\InvalidState;
use Carno\Promise\Features\All;
use Carno\Promise\Features\Deferred;
use Carno\Promise\Features\Fusion;
use Carno\Promise\Features\Race;
use Carno\Promise\Features\Settled;
use Carno\Promise\Features\Sync;
use Closure;
use SplStack;
use Throwable;
use TypeError;

final class Promise implements Promised
{
    use All;
    use Race;
    use Settled;
    use Deferred;
    use Sync;
    use Fusion;

    /**
     * PENDING is initial state
     */
    private const PENDING = 0xF0;
    private const FULFILLED = 0xF1;
    private const REJECTED = 0xF2;

    /**
     * @var int
     */
    private $state = self::PENDING;

    /**
     * @var bool
     */
    private $ack = false;

    /**
     * @var SplStack
     */
    private $stack = null;

    /**
     * @var bool
     */
    private $chained = false;

    /**
     * @var mixed
     */
    private $result = null;

    /**
     * Promise constructor.
     * @param callable $executor
     */
    public function __construct(?callable $executor)
    {
        Stats::proposed($this);
        $this->stack = new SplStack();
        $executor && $this->calling($executor, $this, [$this]);
    }

    /**
     */
    public function __destruct()
    {
        Stats::confirmed($this);
    }

    /**
     * @return bool
     */
    public function pended() : bool
    {
        return ! $this->ack;
    }

    /**
     * @return bool
     */
    public function chained() : bool
    {
        return $this->chained;
    }

    /**
     * @param callable $onFulfilled
     * @param callable $onRejected
     * @return Promised
     */
    public function then(callable $onFulfilled = null, callable $onRejected = null) : Promised
    {
        $this->chained = true;

        $next = new self(null);

        $this->stack->push([$onFulfilled, $onRejected, $next]);

        $this->pended() || $this->settle();

        return $next;
    }

    /**
     * @param callable $onThrowing
     * @return Promised
     */
    public function catch(callable $onThrowing) : Promised
    {
        return $this->then(null, $onThrowing);
    }

    /**
     * @param mixed ...$args
     */
    public function resolve(...$args) : void
    {
        $this->settle(self::FULFILLED, $args);
    }

    /**
     * @param mixed ...$args
     * @throws Throwable
     */
    public function reject(...$args) : void
    {
        $this->settle(self::REJECTED, $args);
    }

    /**
     * @param Throwable $error
     * @throws Throwable
     */
    public function throw(Throwable $error) : void
    {
        $this->reject($error);
    }

    /**
     * @param callable $executor
     * @param Promised $current
     * @param array $arguments
     * @return array [result:mixed, error:throwable]
     */
    private function calling(callable $executor, Promised $current, array $arguments) : array
    {
        try {
            return [call_user_func($executor, ...$arguments), null];
        } catch (Throwable $error) {
            $current->pended() && $current->throw($error);
            return [null, $error];
        }
    }

    /**
     * @param Promised $promised
     * @param int $type
     * @return Closure
     */
    private function resolver(Promised $promised, int $type) : Closure
    {
        return static function (...$args) use ($promised, $type) {
            $type === self::FULFILLED
                ? $promised->resolve(...$args)
                : $promised->reject(...$args)
            ;
        };
    }

    /**
     * @param int $state
     * @param array $args
     * @return Promised
     * @throws Throwable
     * @throws TypeError
     */
    private function settle(int $state = null, array $args = []) : Promised
    {
        if (is_null($state)) {
            $result = $this->result;
        } else {
            if ($this->ack) {
                throw new InvalidState('Promise is already confirmed');
            }
            $this->ack = true;
            $this->state = $state;
            $this->result = $result = $args;
        }

        $resolved = $this->state === self::FULFILLED;

        /**
         * @var Promised $next
         */

        while (!$this->stack->isEmpty()) {
            list($onFulfilled, $onRejected, $next) = $this->stack->shift();

            if (null === $executor = $resolved ? $onFulfilled : $onRejected) {
                $resolved ? $next->resolve(...$result) : $next->reject(...$result);
                continue;
            }

            list($stash, $failure) = $this->calling($executor, $next, $result);

            if ($failure) {
                if ($this->fusion || !$next->chained()) {
                    throw $failure;
                }
            } elseif ($stash instanceof Promised) {
                if ($stash === $this) {
                    throw new TypeError('Response promise is same with current');
                } else {
                    $stash->then($this->resolver($next, self::FULFILLED), $this->resolver($next, self::REJECTED));
                }
            } elseif ($stash instanceof Closure) {
                $this->calling($stash, $next, [$next]);
            } else {
                $resolved ? $next->resolve($stash) : $next->reject($stash);
            }
        }

        return $this;
    }
}


1			<?php
2			/**
3			* Promise EXPR
4			* User: moyo
5			* Date: 03/08/2017
6			* Time: 11:54 AM
7			*/
8
9			namespace Carno\Promise;
10
11			use Carno\Promise\Exception\InvalidState;
12			use Carno\Promise\Features\All;
13			use Carno\Promise\Features\Deferred;
14			use Carno\Promise\Features\Fusion;
15			use Carno\Promise\Features\Race;
16			use Carno\Promise\Features\Settled;
17			use Carno\Promise\Features\Sync;
18			use Closure;
19			use SplStack;
20			use Throwable;
21			use TypeError;
22
23			final class Promise implements Promised
24			{
25			use All;
26			use Race;
27			use Settled;
28			use Deferred;
29			use Sync;
30			use Fusion;
31
32			/**
33			* PENDING is initial state
34			*/
35			private const PENDING = 0xF0;
36			private const FULFILLED = 0xF1;
37			private const REJECTED = 0xF2;
38
39			/**
40			* @var int
41			*/
42			private $state = self::PENDING;
43
44			/**
45			* @var bool
46			*/
47			private $ack = false;
48
49			/**
50			* @var SplStack
51			*/
52			private $stack = null;
53
54			/**
55			* @var bool
56			*/
57			private $chained = false;
58
59			/**
60			* @var mixed
61			*/
62			private $result = null;
63
64			/**
65			* Promise constructor.
66			* @param callable $executor
67			*/
68			public function __construct(?callable $executor)
69			{
70			Stats::proposed($this);
71			$this->stack = new SplStack();
72			$executor && $this->calling($executor, $this, [$this]);
73			}
74
75			/**
76			*/
77			public function __destruct()
78			{
79			Stats::confirmed($this);
80			}
81
82			/**
83			* @return bool
84			*/
85			public function pended() : bool
86			{
87			return ! $this->ack;
88			}
89
90			/**
91			* @return bool
92			*/
93			public function chained() : bool
94			{
95			return $this->chained;
96			}
97
98			/**
99			* @param callable $onFulfilled
100			* @param callable $onRejected
101			* @return Promised
102			*/
103			public function then(callable $onFulfilled = null, callable $onRejected = null) : Promised
104			{
105			$this->chained = true;
106
107			$next = new self(null);
108
109			$this->stack->push([$onFulfilled, $onRejected, $next]);
110
111			$this->pended() \|\| $this->settle();
112
113			return $next;
114			}
115
116			/**
117			* @param callable $onThrowing
118			* @return Promised
119			*/
120			public function catch(callable $onThrowing) : Promised
121			{
122			return $this->then(null, $onThrowing);
123			}
124
125			/**
126			* @param mixed ...$args
127			*/
128			public function resolve(...$args) : void
129			{
130			$this->settle(self::FULFILLED, $args);
131			}
132
133			/**
134			* @param mixed ...$args
135			* @throws Throwable
136			*/
137			public function reject(...$args) : void
138			{
139			$this->settle(self::REJECTED, $args);
140			}
141
142			/**
143			* @param Throwable $error
144			* @throws Throwable
145			*/
146			public function throw(Throwable $error) : void
147			{
148			$this->reject($error);
149			}
150
151			/**
152			* @param callable $executor
153			* @param Promised $current
154			* @param array $arguments
155			* @return array [result:mixed, error:throwable]
156			*/
157			private function calling(callable $executor, Promised $current, array $arguments) : array
158			{
159			try {
160			return [call_user_func($executor, ...$arguments), null];
161			} catch (Throwable $error) {
162			$current->pended() && $current->throw($error);
163			return [null, $error];
164			}
165			}
166
167			/**
168			* @param Promised $promised
169			* @param int $type
170			* @return Closure
171			*/
172			private function resolver(Promised $promised, int $type) : Closure
173			{
174			return static function (...$args) use ($promised, $type) {
175			$type === self::FULFILLED
176			? $promised->resolve(...$args)
177			: $promised->reject(...$args)
178			;
179			};
180			}
181
182			/**
183			* @param int $state
184			* @param array $args
185			* @return Promised
186			* @throws Throwable
187			* @throws TypeError
188			*/
189			private function settle(int $state = null, array $args = []) : Promised
190			{
191			if (is_null($state)) {
192			$result = $this->result;
193			} else {
194			if ($this->ack) {
195			throw new InvalidState('Promise is already confirmed');
196			}
197			$this->ack = true;
198			$this->state = $state;
199			$this->result = $result = $args;
200			}
201
202			$resolved = $this->state === self::FULFILLED;
203
204			/**
205			* @var Promised $next
206			*/
207
208			while (!$this->stack->isEmpty()) {
209			list($onFulfilled, $onRejected, $next) = $this->stack->shift();
210
211			if (null === $executor = $resolved ? $onFulfilled : $onRejected) {
212			$resolved ? $next->resolve(...$result) : $next->reject(...$result);
213			continue;
214			}
215
216			list($stash, $failure) = $this->calling($executor, $next, $result);
217
218			if ($failure) {
219			if ($this->fusion \|\| !$next->chained()) {
220			throw $failure;
221			}
222			} elseif ($stash instanceof Promised) {
223			if ($stash === $this) {
224			throw new TypeError('Response promise is same with current');
225			} else {
226			$stash->then($this->resolver($next, self::FULFILLED), $this->resolver($next, self::REJECTED));
227			}
228			} elseif ($stash instanceof Closure) {
229			$this->calling($stash, $next, [$next]);
230			} else {
231			$resolved ? $next->resolve($stash) : $next->reject($stash);
232			}
233			}
234
235			return $this;
236			}
237			}
238

carno-php / promise

Promise::settle() C last analyzed 2019-07-26 02:30 UTC

Complexity

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Duplication

Importance

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Promise::settle() C
last analyzed 2019-07-26 02:30 UTC