Pool::kill() - Code Metrics - Inspection of "[BUG] actually implement PSR-4" - steadweb/nyx - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#28)

by Luke

created 2016-05-15 17:06 UTC

Pool::kill() A

↳ Parent: Pool

Complexity

Conditions	4
Paths	6

Size

Total Lines	19
Code Lines	12

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	14
CRAP Score	4

Importance

Changes	4
Bugs	0	Features	1

Metric	Value
c	4
b	0
f	1
dl	0
loc	19
ccs	14
cts	14
cp	1
rs	9.2
cc	4
eloc	12
nc	6
nop	1
crap	4

<?php
/**
 * Nyx
 *
 * (The MIT license)
 * Copyright (c) 2016 Luke Steadman
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated * documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * @package Nyx
 */
namespace Nyx;

class Pool implements PoolInterface, OutputableInterface
{
    /**
     * Default amount of workers to spawn
     *
     * @var int
     */
    const DEFAULT_WORKER_COUNT = 1;

    /**
     * Immutable. Number of workers this pool maintain
     *
     * @var int
     */
    protected $numberOfWorkers;

    /**
     * Pool of worker objects
     *
     * @var array
     */
    protected $workers = array();

    /**
     * @var WorkerInterface
     */
    protected $workerInstance;

    /**
     * @var OutputInterface
     */
    protected $output;

    /**
     * Timestamp of when the pool first started
     *
     * @var
     */
    protected $started;

    /**
     * Pool constructor.
     *
     * @param null $numberOfWorkers
     */
    public function __construct($numberOfWorkers = null)
    {
        if (is_null($numberOfWorkers)) {
            $numberOfWorkers = static::DEFAULT_WORKER_COUNT;
        }

        $this->numberOfWorkers = $numberOfWorkers;
    }

    /**
     * {@inheritdoc}
     */
    public function add(WorkerInterface $worker)
    {
        try {
            $this->setWorkerInstance($worker);
        } catch (\Exception $e) {
            $this->getOutput()->write('[x] Unable to set worker instance: ' . $e->getMessage());
        }

        $cmd1 = $worker->getProcess()->getCommand()->getCmd();
        $cmd2 = $this->workerInstance->getProcess()->getCommand()->getCmd();

        if ($cmd1 === $cmd2) {
            $this->workers[] = $worker;
        } else {
            $msg = '$worker must be an instance of WorkerInterface and the same as';
            throw new \Exception($msg . get_class($worker));
        }

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function setWorkerInstance(WorkerInterface $worker)
    {
        if (is_null($this->workerInstance)) {
            $this->workerInstance = clone $worker;
        } else {
            throw new \Exception('setWorkerInstance already called');
        }
    }

    /**
     * {@inheritdoc}
     */
    public function rebuild()
    {
        // Close
        $this->killAll();

        // Then spawn new ones
        for ($i = 0; $i < $this->numberOfWorkers; $i++) {
            $this->spawn();
        }

        return true;
    }

    /**
     * {@inheritdoc}
     */
    public function spawn()
    {
        // Create a clone worker
        if ($this->numberOfWorkers > count($this->getWorkers())) {
            $worker = clone $this->workerInstance;
            $this->add($worker);
            $worker->start();
        } else {
            throw new \Exception('Maximum number of workers allocated for this pool ('.$this->numberOfWorkers.').');
        }

        return $this;
class Author {
    private $name;

    public function __construct($name) {
        $this->name = $name;
    }

    public function getName() {
        return $this->name;
    }
}

abstract class Post {
    public function getAuthor() {
        return 'Johannes';
    }
}

class BlogPost extends Post {
    public function getAuthor() {
        return new Author('Johannes');
    }
}

class ForumPost extends Post { /* ... */ }

function my_function(Post $post) {
    echo strtoupper($post->getAuthor());
}
    }

    /**
     * {@inheritdoc}
     */
    public function kill($pid = null)
    {
        $worker = false;

        if (is_null($pid)) {
            $worker = reset($this->workers);
            $pid = key($this->workers);
        } elseif (array_key_exists($pid, $this->workers)) {
            $worker = $this->workers[$pid];
        }

        if ($worker) {
            $worker->getProcess()->close();
            unset($this->workers[$pid]);
            $this->getOutput()->write('[x] Worker closed.');
        }

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function killAll()
    {
        foreach ($this->workers as $pid => $worker) {
            $this->kill($pid);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function boot()
    {
        if (!$this->started) {
            // Spawn the amount of workers required, if not already set.
            while (count($this->workers) < $this->numberOfWorkers) {
                $this->spawn();
            }

            foreach ($this->workers as $worker) {
                // Only start the worker if it isn't running
                $worker->start();
            }

            $this->started = true;
        }
    }

    /**
     * {@inheritdoc}
     */
    public function ping()
    {
        foreach ($this->getWorkers() as $pid => $worker) {
            // If the worker has stopped, restart it
            if (!$worker->getProcess()->isRunning()) {
                $this->getOutput()->write('[x] Worker stopped. Spawning a new one.');
                $this->kill($pid)->spawn();
            }
        }
    }

    /**
     * {@inheritdoc}
     */
    public function getWorkers()
    {
        return (array) $this->workers;
    }

    /**
     * {@inheritdoc}
     */
    public function setOutput(OutputInterface $output)
    {
        $this->output = $output;
    }

    /**
     * {@inheritdoc}
     */
    public function getOutput()
    {
        if (is_null($this->output)) {
            $this->setOutput(new Console());
        }

        return $this->output;
    }
}


1		<?php
2		/**
3		* Nyx
4		*
5		* (The MIT license)
6		* Copyright (c) 2016 Luke Steadman
7		*
8		* Permission is hereby granted, free of charge, to any person obtaining a copy
9		* of this software and associated * documentation files (the "Software"), to
10		* deal in the Software without restriction, including without limitation the
11		* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
12		* sell copies of the Software, and to permit persons to whom the Software is
13		* furnished to do so, subject to the following conditions:
14		* The above copyright notice and this permission notice shall be included in
15		* all copies or substantial portions of the Software.
16		*
17		* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18		* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19		* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20		* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21		* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22		* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
23		* IN THE SOFTWARE.
24		*
25		* @package Nyx
26		*/
27		namespace Nyx;
28
29		class Pool implements PoolInterface, OutputableInterface
30		{
31		/**
32		* Default amount of workers to spawn
33		*
34		* @var int
35		*/
36		const DEFAULT_WORKER_COUNT = 1;
37
38		/**
39		* Immutable. Number of workers this pool maintain
40		*
41		* @var int
42		*/
43		protected $numberOfWorkers;
44
45		/**
46		* Pool of worker objects
47		*
48		* @var array
49		*/
50		protected $workers = array();
51
52		/**
53		* @var WorkerInterface
54		*/
55		protected $workerInstance;
56
57		/**
58		* @var OutputInterface
59		*/
60		protected $output;
61
62		/**
63		* Timestamp of when the pool first started
64		*
65		* @var
66		*/
67		protected $started;
68
69		/**
70		* Pool constructor.
71		*
72		* @param null $numberOfWorkers
73		*/
74	9	public function __construct($numberOfWorkers = null)
75		{
76	9	if (is_null($numberOfWorkers)) {
77	9	$numberOfWorkers = static::DEFAULT_WORKER_COUNT;
78	9	}
79
80	9	$this->numberOfWorkers = $numberOfWorkers;
81	9	}
82
83		/**
84		* {@inheritdoc}
85		*/
86	8	public function add(WorkerInterface $worker)
87		{
88		try {
89	8	$this->setWorkerInstance($worker);
90	8	} catch (\Exception $e) {
91	6	$this->getOutput()->write('[x] Unable to set worker instance: ' . $e->getMessage());
92		}
93
94	8	$cmd1 = $worker->getProcess()->getCommand()->getCmd();
95	8	$cmd2 = $this->workerInstance->getProcess()->getCommand()->getCmd();
96
97	8	if ($cmd1 === $cmd2) {
98	8	$this->workers[] = $worker;
99	8	} else {
100	1	$msg = '$worker must be an instance of WorkerInterface and the same as';
101	1	throw new \Exception($msg . get_class($worker));
102		}
103
104	8	return $this;
105		}
106
107		/**
108		* {@inheritdoc}
109		*/
110	8	public function setWorkerInstance(WorkerInterface $worker)
111		{
112	8	if (is_null($this->workerInstance)) {
113	8	$this->workerInstance = clone $worker;
114	8	} else {
115	7	throw new \Exception('setWorkerInstance already called');
116		}
117	8	}
118
119		/**
120		* {@inheritdoc}
121		*/
122	1	public function rebuild()
123		{
124		// Close
125	1	$this->killAll();
126
127		// Then spawn new ones
128	1	for ($i = 0; $i < $this->numberOfWorkers; $i++) {
129	1	$this->spawn();
130	1	}
131
132	1	return true;
133		}
134
135		/**
136		* {@inheritdoc}
137		*/
138	5	public function spawn()
139		{
140		// Create a clone worker
141	5	if ($this->numberOfWorkers > count($this->getWorkers())) {
142	5	$worker = clone $this->workerInstance;
143	5	$this->add($worker);
144	5	$worker->start();
145	5	} else {
146	1	throw new \Exception('Maximum number of workers allocated for this pool ('.$this->numberOfWorkers.').');
147		}
148
149	5	return $this;
		0 ignored issues – show Bug Best Practice introduced 2016-02-12 11:50 UTC by Report Bug Copy Issue Report The return type of `return $this;` (`Nyx\Pool`) is incompatible with the return type declared by the interface `Nyx\PoolInterface::spawn` of type `integer`. If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design. Let’s take a look at an example: class Author { private $name; public function __construct($name) { $this->name = $name; } public function getName() { return $this->name; } } abstract class Post { public function getAuthor() { return 'Johannes'; } } class BlogPost extends Post { public function getAuthor() { return new Author('Johannes'); } } class ForumPost extends Post { /* ... */ } function my_function(Post $post) { echo strtoupper($post->getAuthor()); } Our function `my_function` expects a `Post` object, and outputs the author of the post. The base class `Post` returns a simple string and outputting a simple string will work just fine. However, the child class `BlogPost` which is a sub-type of `Post` instead decided to return an `object`, and is therefore violating the SOLID principles. If a `BlogPost` were passed to `my_function`, PHP would not complain, but ultimately fail when executing the `strtoupper` call in its body. Loading history...
150		}
151
152		/**
153		* {@inheritdoc}
154		*/
155	2	public function kill($pid = null)
156		{
157	2	$worker = false;
158
159	2	if (is_null($pid)) {
160	1	$worker = reset($this->workers);
161	1	$pid = key($this->workers);
162	2	} elseif (array_key_exists($pid, $this->workers)) {
163	1	$worker = $this->workers[$pid];
164	1	}
165
166	2	if ($worker) {
167	2	$worker->getProcess()->close();
168	2	unset($this->workers[$pid]);
169	2	$this->getOutput()->write('[x] Worker closed.');
170	2	}
171
172	2	return $this;
173		}
174
175		/**
176		* {@inheritdoc}
177		*/
178	1	public function killAll()
179		{
180	1	foreach ($this->workers as $pid => $worker) {
181	1	$this->kill($pid);
182	1	}
183	1	}
184
185		/**
186		* {@inheritdoc}
187		*/
188	3	public function boot()
189		{
190	3	if (!$this->started) {
191		// Spawn the amount of workers required, if not already set.
192	3	while (count($this->workers) < $this->numberOfWorkers) {
193	3	$this->spawn();
194	3	}
195
196	3	foreach ($this->workers as $worker) {
197		// Only start the worker if it isn't running
198	3	$worker->start();
199	3	}
200
201	3	$this->started = true;
202	3	}
203	3	}
204
205		/**
206		* {@inheritdoc}
207		*/
208		public function ping()
209		{
210		foreach ($this->getWorkers() as $pid => $worker) {
211		// If the worker has stopped, restart it
212		if (!$worker->getProcess()->isRunning()) {
213		$this->getOutput()->write('[x] Worker stopped. Spawning a new one.');
214		$this->kill($pid)->spawn();
215		}
216		}
217		}
218
219		/**
220		* {@inheritdoc}
221		*/
222	7	public function getWorkers()
223		{
224	7	return (array) $this->workers;
225		}
226
227		/**
228		* {@inheritdoc}
229		*/
230	9	public function setOutput(OutputInterface $output)
231		{
232	9	$this->output = $output;
233	9	}
234
235		/**
236		* {@inheritdoc}
237		*/
238	6	public function getOutput()
239		{
240	6	if (is_null($this->output)) {
241		$this->setOutput(new Console());
242		}
243
244	6	return $this->output;
245		}
246		}
247

steadweb / nyx

Pull Request — master (#28)

Pool::kill() A

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