TransactionalStore::decrement() - Code Metrics - matthiasmullie/scrapbook - Measure and Improve Code Quality continuously with Scrutinizer

TransactionalStore::decrement() A
last analyzed 2022-11-07 14:18 UTC

↳ Parent: TransactionalStore

Complexity

Conditions	1
Paths	1

Size

Total Lines	5
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	1
eloc	2
nc	1
nop	4
dl	0
loc	5
rs	10
c	1
b	0
f	0

<?php

namespace MatthiasMullie\Scrapbook\Buffered;

use MatthiasMullie\Scrapbook\Buffered\Utils\Buffer;
use MatthiasMullie\Scrapbook\Buffered\Utils\Transaction;
use MatthiasMullie\Scrapbook\Exception\UnbegunTransaction;
use MatthiasMullie\Scrapbook\KeyValueStore;

/**
 * In addition to buffering cache data in memory (see BufferedStore), this class
 * will add transactional capabilities. Writes can be deferred by starting a
 * transaction & all of them will only go out when you commit them.
 * This makes it possible to defer cache updates until we can guarantee it's
 * safe (e.g. until we successfully committed everything to persistent storage).
 *
 * There will be some trickery to make sure that, after we've made changes to
 * cache (but not yet committed), we don't read from the real cache anymore, but
 * instead serve the in-memory equivalent that we'll be writing to real cache
 * when all goes well.
 *
 * If a commit fails, all keys affected will be deleted to ensure no corrupt
 * data stays behind.
 *
 * @author Matthias Mullie <[email protected]>
 * @copyright Copyright (c) 2014, Matthias Mullie. All rights reserved
 * @license LICENSE MIT
 */
class TransactionalStore implements KeyValueStore
{
    /**
     * Array of KeyValueStore objects. Every cache action will be executed
     * on the last item in this array, so transactions can be nested.
     *
     * @var KeyValueStore[]
     */
    protected $transactions = array();

    /**
     * @param KeyValueStore $cache The real cache we'll buffer for
     */
    public function __construct(KeyValueStore $cache)
    {
        $this->transactions[] = $cache;
    }

    /**
     * Roll back uncommitted transactions.
     */
    public function __destruct()
    {
        while (count($this->transactions) > 1) {
            /** @var Transaction $transaction */
            $transaction = array_pop($this->transactions);
            $transaction->rollback();
        }
    }

    /**
     * Initiate a transaction: this will defer all writes to real cache until
     * commit() is called.
     */
    public function begin()
    {
        // we'll rely on buffer to respond data that has not yet committed, so
        // it must never evict from cache - I'd even rather see the app crash
        $buffer = new Buffer(ini_get('memory_limit'));

        // transactions can be nested: the previous transaction will serve as
        // cache backend for the new cache (so when committing a nested
        // transaction, it will commit to the parent transaction)
        $cache = end($this->transactions);
        $this->transactions[] = new Transaction($buffer, $cache);
    }

    /**
     * Commits all deferred updates to real cache.
     * If the any write fails, all subsequent writes will be aborted & all keys
     * that had already been written to will be deleted.
     *
     * @return bool
     *
     * @throws UnbegunTransaction
     */
    public function commit()
    {
        if (count($this->transactions) <= 1) {
            throw new UnbegunTransaction('Attempted to commit without having begun a transaction.');
        }

        /** @var Transaction $transaction */
        $transaction = array_pop($this->transactions);

        return $transaction->commit();
    }

    /**
     * Roll back all scheduled changes.
     *
     * @return bool
     *
     * @throws UnbegunTransaction
     */
    public function rollback()
    {
        if (count($this->transactions) <= 1) {
            throw new UnbegunTransaction('Attempted to rollback without having begun a transaction.');
        }

        /** @var Transaction $transaction */
        $transaction = array_pop($this->transactions);

        return $transaction->rollback();
    }

    /**
     * {@inheritdoc}
     */
    public function get($key, &$token = null)
    {
        $cache = end($this->transactions);

        return $cache->get($key, $token);
    }

    /**
     * {@inheritdoc}
     */
    public function getMulti(array $keys, array &$tokens = null)
    {
        $cache = end($this->transactions);

        return $cache->getMulti($keys, $tokens);
    }

    /**
     * {@inheritdoc}
     */
    public function set($key, $value, $expire = 0)
    {
        $cache = end($this->transactions);

        return $cache->set($key, $value, $expire);
    }

    /**
     * {@inheritdoc}
     */
    public function setMulti(array $items, $expire = 0)
    {
        $cache = end($this->transactions);

        return $cache->setMulti($items, $expire);
    }

    /**
     * {@inheritdoc}
     */
    public function delete($key)
    {
        $cache = end($this->transactions);

        return $cache->delete($key);
    }

    /**
     * {@inheritdoc}
     */
    public function deleteMulti(array $keys)
    {
        $cache = end($this->transactions);

        return $cache->deleteMulti($keys);
    }

    /**
     * {@inheritdoc}
     */
    public function add($key, $value, $expire = 0)
    {
        $cache = end($this->transactions);

        return $cache->add($key, $value, $expire);
    }

    /**
     * {@inheritdoc}
     */
    public function replace($key, $value, $expire = 0)
    {
        $cache = end($this->transactions);

        return $cache->replace($key, $value, $expire);
    }

    /**
     * {@inheritdoc}
     */
    public function cas($token, $key, $value, $expire = 0)
    {
        $cache = end($this->transactions);

        return $cache->cas($token, $key, $value, $expire);
    }

    /**
     * {@inheritdoc}
     */
    public function increment($key, $offset = 1, $initial = 0, $expire = 0)
    {
        $cache = end($this->transactions);

        return $cache->increment($key, $offset, $initial, $expire);
    }

    /**
     * {@inheritdoc}
     */
    public function decrement($key, $offset = 1, $initial = 0, $expire = 0)
    {
        $cache = end($this->transactions);

        return $cache->decrement($key, $offset, $initial, $expire);
    }

    /**
     * {@inheritdoc}
     */
    public function touch($key, $expire)
    {
        $cache = end($this->transactions);

        return $cache->touch($key, $expire);
    }

    /**
     * {@inheritdoc}
     */
    public function flush()
    {
        $cache = end($this->transactions);

        return $cache->flush();
    }

    /**
     * {@inheritdoc}
     */
    public function getCollection($name)
    {
        $cache = end($this->transactions);

        return new static($cache->getCollection($name));
    }
}


1			<?php
2
3			namespace MatthiasMullie\Scrapbook\Buffered;
4
5			use MatthiasMullie\Scrapbook\Buffered\Utils\Buffer;
6			use MatthiasMullie\Scrapbook\Buffered\Utils\Transaction;
7			use MatthiasMullie\Scrapbook\Exception\UnbegunTransaction;
8			use MatthiasMullie\Scrapbook\KeyValueStore;
9
10			/**
11			* In addition to buffering cache data in memory (see BufferedStore), this class
12			* will add transactional capabilities. Writes can be deferred by starting a
13			* transaction & all of them will only go out when you commit them.
14			* This makes it possible to defer cache updates until we can guarantee it's
15			* safe (e.g. until we successfully committed everything to persistent storage).
16			*
17			* There will be some trickery to make sure that, after we've made changes to
18			* cache (but not yet committed), we don't read from the real cache anymore, but
19			* instead serve the in-memory equivalent that we'll be writing to real cache
20			* when all goes well.
21			*
22			* If a commit fails, all keys affected will be deleted to ensure no corrupt
23			* data stays behind.
24			*
25			* @author Matthias Mullie <[email protected]>
26			* @copyright Copyright (c) 2014, Matthias Mullie. All rights reserved
27			* @license LICENSE MIT
28			*/
29			class TransactionalStore implements KeyValueStore
30			{
31			/**
32			* Array of KeyValueStore objects. Every cache action will be executed
33			* on the last item in this array, so transactions can be nested.
34			*
35			* @var KeyValueStore[]
36			*/
37			protected $transactions = array();
38
39			/**
40			* @param KeyValueStore $cache The real cache we'll buffer for
41			*/
42			public function __construct(KeyValueStore $cache)
43			{
44			$this->transactions[] = $cache;
45			}
46
47			/**
48			* Roll back uncommitted transactions.
49			*/
50			public function __destruct()
51			{
52			while (count($this->transactions) > 1) {
53			/** @var Transaction $transaction */
54			$transaction = array_pop($this->transactions);
55			$transaction->rollback();
56			}
57			}
58
59			/**
60			* Initiate a transaction: this will defer all writes to real cache until
61			* commit() is called.
62			*/
63			public function begin()
64			{
65			// we'll rely on buffer to respond data that has not yet committed, so
66			// it must never evict from cache - I'd even rather see the app crash
67			$buffer = new Buffer(ini_get('memory_limit'));
68
69			// transactions can be nested: the previous transaction will serve as
70			// cache backend for the new cache (so when committing a nested
71			// transaction, it will commit to the parent transaction)
72			$cache = end($this->transactions);
73			$this->transactions[] = new Transaction($buffer, $cache);
74			}
75
76			/**
77			* Commits all deferred updates to real cache.
78			* If the any write fails, all subsequent writes will be aborted & all keys
79			* that had already been written to will be deleted.
80			*
81			* @return bool
82			*
83			* @throws UnbegunTransaction
84			*/
85			public function commit()
86			{
87			if (count($this->transactions) <= 1) {
88			throw new UnbegunTransaction('Attempted to commit without having begun a transaction.');
89			}
90
91			/** @var Transaction $transaction */
92			$transaction = array_pop($this->transactions);
93
94			return $transaction->commit();
95			}
96
97			/**
98			* Roll back all scheduled changes.
99			*
100			* @return bool
101			*
102			* @throws UnbegunTransaction
103			*/
104			public function rollback()
105			{
106			if (count($this->transactions) <= 1) {
107			throw new UnbegunTransaction('Attempted to rollback without having begun a transaction.');
108			}
109
110			/** @var Transaction $transaction */
111			$transaction = array_pop($this->transactions);
112
113			return $transaction->rollback();
114			}
115
116			/**
117			* {@inheritdoc}
118			*/
119			public function get($key, &$token = null)
120			{
121			$cache = end($this->transactions);
122
123			return $cache->get($key, $token);
124			}
125
126			/**
127			* {@inheritdoc}
128			*/
129			public function getMulti(array $keys, array &$tokens = null)
130			{
131			$cache = end($this->transactions);
132
133			return $cache->getMulti($keys, $tokens);
134			}
135
136			/**
137			* {@inheritdoc}
138			*/
139			public function set($key, $value, $expire = 0)
140			{
141			$cache = end($this->transactions);
142
143			return $cache->set($key, $value, $expire);
144			}
145
146			/**
147			* {@inheritdoc}
148			*/
149			public function setMulti(array $items, $expire = 0)
150			{
151			$cache = end($this->transactions);
152
153			return $cache->setMulti($items, $expire);
154			}
155
156			/**
157			* {@inheritdoc}
158			*/
159			public function delete($key)
160			{
161			$cache = end($this->transactions);
162
163			return $cache->delete($key);
164			}
165
166			/**
167			* {@inheritdoc}
168			*/
169			public function deleteMulti(array $keys)
170			{
171			$cache = end($this->transactions);
172
173			return $cache->deleteMulti($keys);
174			}
175
176			/**
177			* {@inheritdoc}
178			*/
179			public function add($key, $value, $expire = 0)
180			{
181			$cache = end($this->transactions);
182
183			return $cache->add($key, $value, $expire);
184			}
185
186			/**
187			* {@inheritdoc}
188			*/
189			public function replace($key, $value, $expire = 0)
190			{
191			$cache = end($this->transactions);
192
193			return $cache->replace($key, $value, $expire);
194			}
195
196			/**
197			* {@inheritdoc}
198			*/
199			public function cas($token, $key, $value, $expire = 0)
200			{
201			$cache = end($this->transactions);
202
203			return $cache->cas($token, $key, $value, $expire);
204			}
205
206			/**
207			* {@inheritdoc}
208			*/
209			public function increment($key, $offset = 1, $initial = 0, $expire = 0)
210			{
211			$cache = end($this->transactions);
212
213			return $cache->increment($key, $offset, $initial, $expire);
214			}
215
216			/**
217			* {@inheritdoc}
218			*/
219			public function decrement($key, $offset = 1, $initial = 0, $expire = 0)
220			{
221			$cache = end($this->transactions);
222
223			return $cache->decrement($key, $offset, $initial, $expire);
224			}
225
226			/**
227			* {@inheritdoc}
228			*/
229			public function touch($key, $expire)
230			{
231			$cache = end($this->transactions);
232
233			return $cache->touch($key, $expire);
234			}
235
236			/**
237			* {@inheritdoc}
238			*/
239			public function flush()
240			{
241			$cache = end($this->transactions);
242
243			return $cache->flush();
244			}
245
246			/**
247			* {@inheritdoc}
248			*/
249			public function getCollection($name)
250			{
251			$cache = end($this->transactions);
252
253			return new static($cache->getCollection($name));
254			}
255			}
256

matthiasmullie / scrapbook

TransactionalStore::decrement() A last analyzed 2022-11-07 14:18 UTC

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TransactionalStore::decrement() A
last analyzed 2022-11-07 14:18 UTC